DESCRIPTIO Wide Range: 1.9V 300kHz Fixed Frequency Current Mode C
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LT1619 Voltage Current Mode Controller
DESCRIPTIO
Wide Range: 1.9V 300kHz Fixed Frequency Current Mode Control Rail-to-Rail N-Channel MOSFET Driver 53mV Current Limit Threshold Voltage Improves Efficiency Implements Boost, SEPIC Flyback Converters Requiring Side Power Transistors Internal Current Sense Amplifier with Leading Edge Blanking 500kHz External Synchronization Burst ModeOperation High Efficiency Light Load 140µA Quiescent Current 15µA Shutdown Current 8-Lead MSOP Packages
®1619 fixed frequency controller implementing current mode DC/DC converters with minimum external parts. LT1619 operates with input voltage ranging from 1.9V suitable variety battery-powered distributed DC/DC converters. internal rail-to-rail N-channel MOSFET driver operates either from input nonbootstrapped mode from output bootstrapped operation. driver designed drive side power transistor boost, SEPIC, flyback other topologies. Converter efficiency improved heavy loads with 53mV current sense voltage light load with Burst Mode operation. operating frequency internally 300kHz. oscillator also synchronized externally 500kHz. load quiescent current 140µA shutdown current 15µA. LT1619 available 8-lead MSOP packages.
registered trademarks Linear Technology Corporation. Burst Mode trademark Linear Technology Corporation.
APPLICATIO
3.3V DC/DC Converters Distributed Power Supplies Isolated Power Supplies
TYPICAL APPLICATIO
37.4k 220pF 15nF LT1619 GATE SENSE
3.3V
12.4k
0.1µF
22µF 0.1µF
5.6µH VOUT 2.2A
Si9804
EFFICIENCY
COUT 440µF
RSENSE 0.01
1619
PANASONIC EEFCDOK220R COUT: KEMET T495X227K010AS MBRD835L COILCRAFT DO5022P-562
Figure High Efficiency 3.3V DC/DC Converter
Efficiency
LOAD CURRENT (mA) 1000
1619 F01a
LT1619
ABSOLUTE
RATI
Input Voltage (VIN) 0.3V Gate Drive Supply Voltage (DRV) 0.3V Shutdown/Synch Voltage (S/S) 0.3V Feedback Voltage (FB) Compensation Voltage (VC) Gate Drive Output Current (GATE) ±1.5A
PACKAGE/ORDER ATIO
VIEW GATE SENSE
ORDER PART NUMBER LT1619EMS8
PACKAGE 8-LEAD PLASTIC MSOP
PART MARKING LTHC
TJMAX 125°C, 200°C/
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VDRV 2.5V, VS/S VIN, COMP open, VSENSE unless otherwise noted.
PARAMETER Reference Voltage Reference Line Regulation Input Bias Current Error Amplifier Transconductance Error Amplifier Output Source Current Error Amplifier Output Sink Current Error Amplifier Clamp Voltage Undervoltage Lockout Threshold Input Voltage Range Switching Frequency Synchronization Frequency Range Maximum Duty Cycle Current Limit Threshold Burst Mode Operation Current Limit
CONDITIONS Measured 1.9V VREF
VCOMP 1.5V, VCOMP
1.9V
(Note
Current Sense Voltage (SENSE) 0.5V Operating Temperature Range (Note 40°C 85°C Junction Temperature (Note 125°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
VIEW GATE SENSE
ORDER PART NUMBER LT1619ES8
PART MARKING 1619
PACKAGE 8-LEAD PLASTIC
TJMAX 125°C, 120°C/
1.22
1.24 0.004
1.26 0.05 1.85
UNITS
1.65
LT1619
ELECTRICAL CHARACTERISTICS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VDRV 2.5V, VS/S VIN, COMP open, VSENSE unless otherwise noted.
PARAMETER Current Sense Input Current Current Limit Delay Driver Output Rise Time Driver Output Fall Time Driver Output High Level Driver Output Level Shutdown Driver Output Level Idle Mode Driver Output Level Current Operating Supply Current Quiescent Supply Current Shutdown Supply Current Shutdown Threshold Shutdown Delay Note Absolute Maximum Ratings those values beyond which life device impaired. Note LT1619E guaranteed meet performance specifications from 70°C. Specifications over 40°C 85°C operating temperature range assured design, characterization correlation with statistical process controls. 3300pF 3300pF IOUT 20mA IOUT 200mA IOUT 20mA IOUT 200mA VS/S IOUT 20mA VS/S VIN, 1.5V, IOUT 20mA VS/S VS/S VS/S VIN, 1.5V VS/S VS/S 18V, 85°C 0.45
CONDITIONS VSENSE
UNITS
VDRV VDRV
VDRV 0.35 VDRV
Note calculated from ambient temperature power dissipation thermal resistance package according formula:
TYPICAL PERFOR CHARACTERISTICS
Bandgap Voltage Temperature
1.245 1.243 1.241
BANDGAP VOLTAGE
2.5V
1.239
IS/S (µA)
1.237 1.235 1.233 1.231
85°C
CURRENT (µA)
1.229 1.227 1.225
1619
TEMPERATURE (°C)
IS/S VS/S
-40°C 25°C
Current Temperature
VS/S 2.5V VS/S
VS/S
1619
TEMPERATURE (°C)
1619
LT1619 TYPICAL PERFOR CHARACTERISTICS
Shutdown Supply Current Input Voltage
IDLE MODE SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
DEVIATION FROM NOMINAL FREQUENCY
-40°C 25°C INPUT VOLTAGE
1619
85°C
Maximum Duty Ratio Temperature
2.5V
FREQUENCY DEVIATION
CURRENT LIMIT THRESHOLD (mV)
DUTY RATIO
TEMPERATURE (°C)
Burst Mode Operation Current Limit Threshold Temperature
CURRENT LIMIT THRESHOLD (mV)
2.5V DUTY CYCLE
SENSE CURRENT (µA)
SENSE CURRENT (µA)
TEMPERATURE (°C)
1619
Idle Mode Supply Current Temperature
2.5V
Frequency Deviation from Nominal Temperature
TEMPERATURE (°C)
1619
2.5V NOMINAL FREQUENCY 300kHz
TEMPERATURE (°C)
1619
Deviation from Nominal Frequency Input Voltage
25°C NOMINAL FREQUENCY 300kHZ
Current Limit Threshold Temperature
2.5V
INPUT VOLTAGE
1619
TEMPERATURE (°C)
1619
SENSE Input Bias Current Temperature
-115 -117 -119 -121 -123 -125 -127 -129 -131 -133 VSENSE -100 -105 -110 -115 -120 -125 TEMPERATURE (°C)
SENSE Input Bias Current Sense Voltage
25°C
-135
-130
VSENSE (mV)
1619 1619
1619
LT1619
CTIO
(Pin Shutdown Synchronization. Shutdown active with typical threshold voltage 0.9V. normal operation, tied VIN. externally synchronize controller, drive with pulses. (Pin inverting Input Error Amplifier. Connect resistor divider here. VOUT according VOUT 1.24(1 R1/R2). Figure (Pin Compensation Error Amplifier. output transconductance amplifier. Overall loop compensated with network from this ground. (Pin Ground. Connect local ground plane. SENSE (Pin Input Current Sense Amplifier. SENSE connected source N-channel MOSFET sense resistor ground. current limit threshold internally 53mV, giving maximum switch current 53mV/RSENSE. GATE (Pin Output MOSFET Driver. (Pin Pull-Up Supply MOSFET Driver. this (Pin nonbootstrapped operation converter output bootstrapped operation. (Pin Supply Battery Input. Must closely bypassed ground plane.
BLOCK DIAGRA
ERROR AMPLIFIER 1.24V
1.8V
CURRENT SENSE
SHUTDOWN DELAY REF/BIAS CURRENT LIMIT COMPARATOR
ILIM
1619
Figure LT1619 Block Diagram
RAMP COMP 300kHz SYNC OSCILLATOR
UVLO
IDLE
DRIVER
GATE LOAD RSENSE
SENSE
280ns LEADING EDGE BLANKING
LT1619
OPERATIO
LT1619 fixed frequency current mode switching regulator controller that used boost, SEPIC flyback modes. device operates from input supply range 1.9V 18V, separate supply (DRV) gate driver. bootstrapped VOUT additional gate enhancement voltage applications like 3.3V boost converters, connected input supply higher voltage inputs. best understand operation LT1619, please refer Figure Block Diagram. gate drive circuit turns external MOSFET trailing edge oscillator output signal CLK. MOSFET current sensed with external resistor (RSENSE Figure leading edge blanking circuit disables current sense amplifier 280ns immediately following switch turn-on, preventing gate charging current from prematurely tripping comparator. slope compensating ramp, derived from oscillator, added current sense output. driver turns MOSFET when this exceeds error amplifier output switch current limited with separate comparator. compensating ramp progressive nonlinear function operating duty ratio whereas current limit does vary with duty ratio. Error amplifier output determines peak switch current required regulate output voltage. considered measure output current. heavy loads, upper range. Average peak inductor currents high. this range, inductor tends continuous conduction mode (CCM), where current always flowing inductor. load current decreases, average peak inductor current decreases. When average inductor current falls below peak-to-peak inductor current ripple, converter enters discontinuous conduction mode (DCM), where current inductor reaches zero sometime during discharge phase. Further reduction output current moves towards lower operating range, decreasing inductor current. Hysteretic comparator determines LT1619 operate efficiently. falls below trip voltage A1's output goes high, turning blocks except error amplifier, LT1619 enters idle state switching stops. device draws just 140µA from input idle state. Output load current
discharges output capacitor, causing output voltage decrease. VOUT decreases, increases. increases above switching action begins, delivering power output. switch current sense threshold about 10mV this region. output load remains light, output voltage will rise will fall, causing converter idle again. This known Burst Mode operation. burst frequency depends input voltage, output voltage, inductance output capacitance. Output voltage ripple during Burst Mode operation usually higher than when converter switching continuously. Burst Mode operation increases light load efficiency because delivers more energy clock cycle than possible with discontinuous mode operation extremely peak switch current, allowing fewer switching cycles maintain given output. supply current therefore becomes small fraction total input current. Setting Output Voltage output voltage LT1619 with resistive divider connected from output ground detailed Figure divider tied device pin. Current through should significantly higher than bias current 25nA. With 10k, input bias current error amplifier 0.02% current
1.24V 1.24 LT1619
1619
Figure Feedback Resistive Divider
Synchronization Shutdown (Pin used synchronize oscillator external source. tied input (VIN 1.9V) normal operation. oscillator LT1619 externally synchronized driving with pulse train with amplitude least maximum allowable rise time function pulse amplitude, shown Table Rise times equal
LT1619
OPERATIO
less than number specified Table acceptable. maximum duty cycle essentially unaffected synchronization. device will into shutdown mode voltage stays below shutdown threshold 0.45V
Table Maximum Allowable Rise Time Synchronization Pulse. Rise Time Slower Clock Amplitude Higher
SYNCHRONIZATION AMPLITUDE MAXIMUM ALLOWABLE RISE TIME (ns)
APPLICATIO ATIO
Inductor
value inductor usually selected that peak-to-peak ripple current less than maximum inductor current. inductor should able handle maximum inductor current full load without saturation. Powder iron cores suitable high frequency switch mode power supply applications because their high core losses. Ferrite cores have very core losses material choice high frequency DC/DC converters. Power MOSFET Driver LT1619 capable driving side N-channel power MOSFET with 60nC total gate charge (Qg). external driver recommended MOSFETs with greater than 80nC total gate charge. peak gate drive current varies from 0.5A with VDRV 2.5V 1.2A with VDRV 10V. MOSFET driver capable charging gate power MOSFET within 350mV upper gate drive supply rail (DRV). also pull gate MOSFET within 100mV ground during turnoff. upper supply rail gate drive brought device
LT1619
more than 33µs. This shutdown delay reset whenever voltage rises above shutdown threshold. Applying logic signal causes gate drive output low. Although circuits LT1619 disabled, pull-down circuit MOSFET buffer still biased capable shunting leakage transient current GATE ground, eliminating need external bleed resistor. LT1619 consumes 15µA shutdown. LT1619 guaranteed start with minimum 1.85V. Comparator senses input voltage generates undervoltage lockout (UVLO) signal falls below this minimum. While undervoltage lockout, pulled LT1619 stops switching. supply current drawn device falls 140µA. (DRV) design flexibility. boost converter design, tied converter output minimum input voltage insufficient fully enhance power MOSFET. During start-up, MOSFET driven with gate voltage starting from forward voltage rectifying diode). output voltage rises, gate drive also increases until steady state reached. steady-state converter output voltage exceeds maximum allowable gate source voltage input voltage sufficient enhance MOSFET, tied input supply. SEPIC converter, tied input diode OR'ed from input output (Figure
VOUT
1619
Figure SEPIC Converter with Diode OR'ed Gate Drive Supply
LT1619
APPLICATIO ATIO
Power MOSFET MOSFET power dissipation separated into frequency independent frequency dependent components. RDS(ON) loss switch product mean square switch current switch RDS(ON) does vary with operating frequency. frequency-dependent switching losses consist switch transition loss finite rise fall times drain source voltage drain current gate switching loss, i.e., packet charge (the total gate charge) which moved from gate drive power supply ground every switch cycle, drain switching loss, charge stored parasitic drain capacitance, COSS dumped ground switch turned transistor loss expressed PLOSS IDRMS2 RDS(ON) transition loss QgVGfS 1/2COSSVDS(OFF)2fS where transition loss estimated with:
Transition Loss
CRSSVDS(OFF) IG(AVG)
total gate charge Gate drive voltage VDRV IG(AVG) average MOSFET buffer output current Operating frequency CRSS average between VDS(OFF) VDS(OFF) (12V) operating frequencies below 500kHz, ohmic losses often dominate. high voltage converters, transition loss COSS charge dumping loss dramatically impact converter efficiency. MOSFETs with lower parasitic capacitances higher RDS(ON) actually provide better efficiency these situations. Capacitors switch mode DC/DC converter, output ripple voltage product equivalent series resistance (ESR)
output capacitor peak-to-peak capacitor current. Depending topology, current feeding output capacitor continuous discontinuous. input current also continuous discontinuous even inductor current itself continuous. boost topology, inductor series with input source input current continuous output current discontinuous. buck-boost flyback converters, inductor series with input source output, neither input current output current continuous. Whenever terminal current discontinuous, capacitor that terminal should chosen handle ripple current. Capacitor reliability will adversely affected ripple current exceeds maximum allowable ratings. This maximum rating specified ripple current. Several capacitors mounted parallel meet size ripple current requirements. Besides ripple voltage requirements, output capacitor also needs sized acceptable output voltage variation under load transients. Current Sensing Resistor RSENSE LT1619 drives side N-channel MOSFET switch. switch current sensed with external resistor RSENSE connected between source MOSFET ground. internal blanking circuit blocks voltage spike developed across RSENSE 280ns switch turnon. switch turned when instantaneous voltage across RSENSE exceeds current limit threshold, VSENSE. Allowing variations VSENSE yields:
RSENSE VSENSE(MIN) IL(MAX)
current limit threshold constant does vary with duty ratio. signal level sense voltage, inductance sense resistors required reduce switching noise. resistors maintain constant current limit over temperature. Dale series sense resistors meet these criteria.
LT1619
APPLICATIO ATIO
Diode Schottky diodes recommended output voltage applications because their forward voltage. Since Schottky diodes have negligible stored charge, charge dumping loss also reduced. reverse breakdown voltage diode should exceed maximum reverse voltage stress topology used. diode should also able carry peak diode current with acceptable foward voltage. boost converter Figure peak inductor current approximately Motorola MBRD835 used forward voltage. Lowering Burst Mode Operation Current Limit LT1619 automatically enters Burst Mode operation voltage falls below corresponding switch current Burst Mode operation switch current threshold, ID(BURST). effective Burst Mode operation current threshold lowered adding offset input current sense amplifier that switch current appears higher comparator. This effect shifting operating range above Although Burst Mode operation entirely disabled, peak switch current before entering Burst Mode operation greatly reduced offset current sense amplifier. peak switch current also determined current sense amplifier blanking. lower Burst Mode operation current sense threshold, resistor added between SENSE sense resistor RSENSE (Figure input bias current IBIAS current sense amplifier, which
CURRENT SENSE AMPLIFIER
IBIAS 120µA
IBIAS 120µA SENSE
RSENSE
1619
Figure Lowering Burst Mode Operation Current Limit
tolerance ±25% temperature stable, develops offset voltage sense input. value required non-Burst Mode operation obtained with expression: IBIASROS VSENSE(BURST) where VSENSE(BURST) (Burst Mode operation peak switch current, ID(BURST)) RSENSE example, IBIAS 120µA VSENSE(BURST) 10mV:
10mV 120µA
Allowing variations IBAIS VSENSE(BURST) respectively: (1.25)(1.3)(83) Choose completely disable Burst Mode operation. Lower values (for example, 100) used lower effective Burst Mode current limit. value sense resistor then adjusted compensate reduced full-scale sense voltage. IBIASROS IL(MAX)RSENSE 40mV Filtering Current Sense Signal current mode converter, current sense circuit senses switch current terminates switch conduction. LT1619, current sense amplifier full-scale input voltage range from ground current limit threshold (53mV). high speed switching transients parasitic trace inductances, current sense signal VSENSE tends noisy. VSENSE switching transient excessive, current sense amplifier will amplify spurious transient instead, resulting jittery operation. situations where internal leading edge blanking inadequate, lowpass filter (Figure with corner frequency about times switching frequency used further attenuate high speed switching transients. Figure lowpass filter corner frequency
LT1619
APPLICATIO ATIO
fCORNER 2ROSCS
(The input impedance sense amplifier SENSE 2500 typically less than 137.) Typical values 1nF. value reduces Burst Mode threshold; 10nF when this desireable.
LT1619 COMPARATOR CURRENT SENSE AMPLIFIER
SENSE
RSENSE
Figure Current Sense Filter Improving Jitter Performance
Shutdown Function Modify Undervoltage Lockout LT1619 designed operate from input supply with voltage 1.85V. Shutdown activated when pulled below 0.45V. shutdown threshold slightly greater than junction diode forward voltage temperature characteristics junction diode. normally tied input when operating from voltage input source. Consider isolated flyback converter (see Typical Applications). converter draws line while delivering 0.4A output. tied input, then LT1619 will start switching soon exceeds internal UVLO threshold. With full load, converter draw much higher than steady-state from input source during start-up. input source current limited, input voltage will collapse latch low. start-up problem prevented adding zener diode resistor (Figure This equivalent increasing undervoltage lockout voltage controller. Before exceeds zener voltage current shunted ground through
IS/S LT1619 GATE SENSE
1619
IS/S VS/S
SHUTDOWN THRESHOLD
UVLO THRESHOLD SHUTDOWN THRESHOLD IS/S -2µA VS/S
Figure Implementing Undervoltage Lockout
VSENSE
ZENER DIODE
AVALANCHE DIODE
1619
Figure Characteristics Zener Avalanche Breakdown Diodes
LT1619 GATE SENSE
1619
Figure Filtering Input Voltage Ripple UVLO Circuit
resistor voltage developed across IS/S should less than shutdown threshold. LT1619 remains until exceeds shutdown threshold. True zener diodes higher voltage avalanche diodes have different characteristics (Figure They need biased appropriately (value order obtain correct UVLO threshold. When implementing UVLO with converters with high input ripple voltages (such flyback forward), circuit Figure modified shown Figure
LT1619
APPLICATIO ATIO
Here input voltage ripple filtered with prevent input ripple from falsely tripping LT1619 synchronization circuit. recommended that:
fOSC
Implementation Hysteretic UVLO with External Synchronization UVLO circuit shown Figure operates down 0.9V supply voltage. Algebraically UVLO trip points are:
VINH VINL UVLO Hysteresis VINH VINL
8.2V 510k BAT85 2N2222 2N2222 LT1619 GATE SENSE
1619
UPPER TRIP POINT LOWER TRIP POINT 8.4V
Figure Addition Hysteresis UVLO While Synchronizing LT1619. Component Values Shown Upper Lower Trip Points 8.4V. UVLO, Gate Drive Disabled Pulling Low. Disabling Clock Shuts Down LT1619. Synchronized, Collector Tied Diode Eliminated
collector votage made about 1.4V lower trip voltage. This necessary prevent UVLO circuit from interfering with feedback amplifier LT1619. Trickle Current Start from High Voltage Supplies shutdown idle mode quiescent supply currents LT1619 utilized implement trickle current start from high voltage input sources (such telecom bus). trickle current start-up circuit Figure modified from UVLO circuit Figure high value resistor that charges storage capacitor during start-up. Before reaches upper UVLO trip point, holds low. LT1619 draws shutdown mode current (15µA) from VCC. collector also tied through diode Figure LT1619 will then draw idle mode quiescent current (140µA) from VCC. should able charge while supplying current UVLO circuit LT1619. Maximizing values reduces power dissipation R10. When crosses upper UVLO threshold, LT1619 starts switching current consumption increases. Before bootstrap takes over, LT1619 draws current from ramps towards lower UVLO threshold. Increasing value allows more time bootstrap circuit establish itself before converter enters undervoltage lockout.
LT1619 GATE SENSE
1619
BOOTSTRAP WINDING
Figure Trickle Current Start-Up with Bootstrapped
LT1619
APPLICATIO ATIO
Increasing Ramp Compensation While Synchronizing LT1619 synchronized forced discharge internal timing ramp. timing ramp amplitude decreases synchronization frequency increases. Since internal compensation ramp derived from timing ramp, reduced timing ramp results diminished compensating ramp. LT1619 synchronized frequencies higher than free-running frequency, external ramp compensation will required. Figures show such schemes. both figures compensating ramps kept linear making R11-C1 R14-C2 products substantially higher than synchronizing period. compensation ramps,
LT1619 GATE SENSE 220pF 100k 1N4148 MAIN POWER TRANSISTOR 2N2222 2200
RSENSE
1619
Figure Increasing Ramp Compensation. Buffers Ramp. Discharges Values Shown Gate Drive 15mV Ramp Across Duty Cycle 500kHz
LT1619 GATE SENSE
2.2nF 1N4148 8200 1N4148 2400 RSENSE
1619
Figure Externally Increasing Ramp Compensation. Similar Figure Except That Buffered with Transistor
whose peak amplitudes made between current limit threshold, developed across R13. result, effective current limit threshold reduced compensating ramp offset voltage developed across SENSE input bias current (see Figure Moreover, current limit threshold becomes duty cycle dependent. Board Layout Other Practical Considerations following recommended board layout: Trace lengths branches carrying switched current should kept short. example, boost converter Figure circuit loop formed RSENSE, COUT carries switched current. size this loop must minimized. RSENSE COUT should grounded single point large ground plane. This reduces switching noise overall converter jitter. also preferable ground input capacitor close common point between COUT RSENSE although this less important. Keep trace between sense resistor SENSE short. When sensing high switch current, Kelvin connection RSENSE necessary. Bypass both pins with ceramic capacitors next ground plane. Keep high voltage switching nodes, such drain gate MOSFET, away from pins. inductor that ripple current between peak current. Steeper inductor current ramp results sharper comparator switching, hence less jitter. most cases, filtering current sense signal necessary jitter-free operation. Figure board layout 5V/8A 12V/5A boost converters shown Figures 16a.
LT1619
APPLICATIO ATIO
LT1619 RSENSE CIN1 COUT1,
Figure Recommended Component Placement Boost Converters Figures
CDRV CIN2 VOUT
1619
LT1619
APPLICATIO ATIO
150pF 15nF LT1619 GATE SENSE CIN2 CERAMIC CDRV 0.1µF CERAMIC
CIN1: SANYO POSCAP 6TPB150M COUT1: SANYO POSCAP 10TPB220M MOTOROLA MBRB1545CT SUMIDA CEPH149-1R0 RSENSE: PANASONIC 0.002
EFFICIENCY
CIN1 300µF
FDS6680A COUT1 RSENSE 220µF
COUT2 10µF CERAMIC
37400 12400
1619 F15a
Figure 15a. 3.3V 5V/8A Boost Converter
3.3V
0.01
LOAD CURRENT
1619 F15b
Figure 15b. Efficiency 5V/8A Boost Converter
LT1619
APPLICATIO ATIO
47pF 68.1k 2200pF
LT1619 GATE SENSE
CIN1: SANYO OS-CON 10SA100M COUT1: SANYO OS-CON 16SA150M MOTOROLA MBRB1545CT SUMIDA CDEP149-1R8 RSENSE: PANASONIC 0.002
Figure 16a. 12V/5A Boost Converter
EFFICIENCY
0.01 LOAD CURRENT
1619 F16b
Figure 16b. Efficiency 12V/5A Boost Converter
CIN2 CERAMIC CDRV 0.1µF CERAMIC 1.8µH
CIN1 100µF
FDS6690A COUT1 RSENSE 600µF
COUT2 10µF CERAMIC
107k 12400
1619 F15a
LT1619
TYPICAL APPLICATIO
4.75V 5.25V
1.1k 2.2nF 22nF LT1619 GATE SENSE 0.007 2N5210 432k
1619 F17a
4.7µF FILM
MBRS340T3
10µF
SUD45N05-20L 50V, 0.018 43nC
220pF 2N5210 10.5k
COILTRONICS CTX02-14261, EFD20-3F3, WINDINGS EACH, 12µH
Figure 17a. Converter
EFFICIENCY
5.25V
4.75V
LOAD CURRENT (mA)
1000
1619 F17b
Figure 17b. Efficiency
1500µF 6.3V SANYO MV-GX
1N749 4.3V
4.7µF FILM
MBRS340T3
-48V/0.5A
470µF SANYO MV-GX
470µF SANYO MV-GX
LT1619
TYPICAL APPLICATIO
10.5V 13.7V
8.1V
0.22µF
MBRS1100T3
0.1µF
LT1619 GATE SENSE
150µF SANYO 20SV150M (OS-CON)
Figure 18a. Isolated Local SLIC Power Supply (Flyback) Total Output Power (65V/0.3A 32.5V/0.6A)
EFFICIENCY
Figure 18b. Efficiency Isolated Local SLIC (Flyback)
CNY17-3 6.2V 220pF
330pF 100V 1/4W
2.2µF
470pF
MBRS1100T3
LT1431CZ
-32.5V
330pF 2.2µF
2.49k -65V
MBRS1100T3
10µF
IRLR024N 55V, 0.065 15nC
PHILIPS EFD20-3F3-A100-S CORE (0.013" GAP, 100nH/T2 TRIFILAR 28AWG 28AWG 28AWG TRIFILAR 28AWG 2mil POLYESTER FILM
0.008
1619 F18a
LOAD CURRENT (mA) 1000
1619 F18b
13.7V 10.5V
LT1619
PACKAGE DESCRIPTION
0.007 (0.18) 0.021 0.006 (0.53 0.015)
DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.006" (0.152mm) SIDE DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSIONS. INTERLEAD FLASH PROTRUSIONS SHALL EXCEED 0.006" (0.152mm) SIDE
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead Plastic MSOP
(LTC 05-08-1660)
0.118 0.004* (3.00 0.102)
0.193 0.006 (4.90 0.15)
0.118 0.004** (3.00 0.102)
0.040 0.006 (1.02 0.15) SEATING PLANE 0.012 (0.30) 0.0256 (0.65)
0.034 0.004 (0.86 0.102)
0.006 0.004 (0.15 0.102)
MSOP (MS8) 1098
LT1619
PACKAGE DESCRIPTION
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.014 0.019 (0.355 0.483) *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.016 0.050 (0.406 1.270)
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.189 0.197* (4.801 5.004)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0.053 0.069 (1.346 1.752)
0.004 0.010 (0.101 0.254)
0.050 (1.270)
1298
LT1619
TYPICAL APPLICATIO
1.5µF 100V
1N4687 4.3V LEVEL (IZT 50µA)
VITRAMON VJ1825Y155MXB (1825/X7R) TAIYO YUDEN LMK325BJ106MN (1210/X7R) TAIYO YUDEN EMK316BJ105ML (1206/X7R) COILTRONICS VP1-0190 (ER11/5, WINDINGS EACH 12.2µH)
Figure 2.5W, 4VIN-28VIN 5V/0.5A Nonisolated Supply
RELATED PARTS
PART NUMBER LT1370 LT1372 LT1613 LTC1624 LT1680 LTC1872 LT1949 DESCRIPTION 500kHz, Switching Regulator 500kHz, 1.5A Switching Regulator 1.4MHz, SOT-23 DC/DC Converter Switching Regulator Controller Synchronous Boost Controller SOT-23 Boost Controller 600kHz, DC/DC Converter COMMENTS Boost, Buck, Flyback, Forward, Inverting; Switch Voltage SO-8, 2.7V 30V, Switch Voltage Fixed Frequency, 0.9V 10V, Switch Voltage SO-8, Drives N-Ch MOSFET, 3.5V Synchronous Operation High Current/High Efficiency 550kHz Fixed Frequency, Current Mode MSOP8, 1.5V 12V, Low-Battery Detector
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
1.5µF 100V FMMT3904 MBRS0530T1 MMFT3055VL 3.74k 0.022µF 5.6k
MBRS340T3
VOUT 0.5A
GATE
SENSE LT1619 2.2k 2.2nF
10µF
220pF
0.015
1.24k
1619 TA01
1619f LT/TP 1000 PRINTED
LINEAR TECHNOLOGY CORPORATION 2000
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