®1933 current mode step-down DC/DC converter with internal 0.75A power
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LT1933 600mA, 500kHz Step-Down Switching Regulator SOT23 Packages DESCRIPTION
®1933 current mode step-down DC/DC converter with internal 0.75A power switch, packaged tiny 6-lead SOT-23. wide input range 3.6V makes LT1933 suitable regulating power from wide variety sources, including unregulated wall transformers, industrial supplies automotive batteries. high operating frequency allows tiny, cost inductors ceramic capacitors, resulting low, predictable output ripple. Cycle-by-cycle current limit provides protection against shorted outputs, soft-start eliminates input current surge during start current (<2A) shutdown provides output disconnect, enabling easy power management battery-powered systems.
Lare registered trademarks Linear Technology Corporation. ThinSOT trademark Linear Technology Corporation. other trademarks property their respective owners.
Wide Input Range: 3.6V 600mA from Input 3.3V 600mA from Input 500mA from 6.3V Input 3.3V 500mA from 4.5V Input Fixed Frequency 500kHz Operation Uses Tiny Capacitors Inductors Soft-Start Internally Compensated Shutdown Current: Output Adjustable Down 1.25V Profile (1mm) SOT-23 (ThinSOTTM) (2mm 0.75mm) 6-Pin Packages
APPLICATIONS
Automotive Battery Regulation Industrial Control Supplies Wall Transformer Regulation Distributed Supply Regulation Battery-Powered Equipment
TYPICAL APPLICATION
3.3V Step-Down Converter
4.5V 1N4148 BOOST LT1933 SHDN 16.5k 2.2F MBRM140 0.1F VOUT 3.3V/500mA EFFICIENCY VOUT 3.3V
1933 TA01a
Efficiency
VOUT
LOAD CURRENT (mA)
1933 TA01b
1933fd
LT1933 ABSOLUTE MAXIMUM RATINGS
(Note
Input Voltage (VIN) 0.4V BOOST Voltage .43V BOOST Above Pin.20V SHDN -0.4V Voltage -0.4V Operating Temperature Range (Note LT1933E -40°C 85°C
LT1933I -40°C 125°C LT1933H. -40°C 150°C Maximum Junction Temperature LT1933E, LT1933I 125°C LT1933H. 150°C Storage Temperature Range. -65°C 150°C Lead Temperature, Package (Soldering, sec) 300°C
CONFIGURATION
VIEW VIEW BOOST SHDN BOOST SHDN
PACKAGE 6-LEAD (2mm 3mm) PLASTIC 73.5°C/W, 12°C/W EXPOSED (PIN GND, MUST SOLDERED
PACKAGE 6-LEAD PLASTIC TSOT-23 165°C/W, 102°C/W
ORDER INFORMATION
LEAD FREE FINISH LT1933IDCB#PBF LT1933HDCB#PBF LT1933ES6#PBF LT1933IS6#PBF LT1933HS6#PBF LEAD BASED FINISH LT1933IDCB LT1933HDCB LT1933ES6 LT1933IS6 LT1933HS6 TAPE REEL LT1933IDCB#TRPBF LT1933HDCB#TRPBF LT1933ES6#TRPBF LT1933IS6#TRPBF LT1933HS6#TRPBF TAPE REEL LT1933IDCB#TR LT1933HDCB#TR LT1933ES6#TR LT1933IS6#TR LT1933HS6#TR PART MARKING LCGM LCGN LTAGN LTAGP LTDDQ PART MARKING LCGM LCGN LTAGN LTAGP LTDDQ PACKAGE DESCRIPTION 6-Lead (2mm 3mm) Plastic 6-Lead (2mm 3mm) Plastic 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 PACKAGE DESCRIPTION 6-Lead (2mm 3mm) Plastic 6-Lead (2mm 3mm) Plastic 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 TEMPERATURE RANGE -40°C 125°C -40°C 150°C -40°C 85°C -40°C 125°C -40°C 150°C TEMPERATURE RANGE -40°C 125°C -40°C 150°C -40°C 85°C -40°C 125°C -40°C 150°C
Consult Marketing parts specified with wider operating temperature ranges. more information lead free part marking, http://www.linear.com/leadfree/ more information tape reel specifications,
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LT1933 ELECTRICAL CHARACTERISTICS
PARAMETER Undervoltage Lockout Feedback Voltage Bias Current Quiescent Current Quiescent Current Shutdown Reference Line Regulation Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current Minimum Boost Voltage Above Switch BOOST Current SHDN Input Voltage High SHDN Input Voltage SHDN Bias Current VSHDN 2.3V (Note VSHDN 0.01 400mA 400mA (Note 400mA, Package 400mA, DCB6 Package Measured VREF 10mV (Note Switching VSHDN 1.1V
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 12V, VBOOST 17V, unless otherwise noted. (Note
CONDITIONS 1.225 3.35 1.245 0.01 0.01 0.75 1.05 1.265 UNITS
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note LT1933E guaranteed meet performance specifications from 70°C. Specifications over -40°C 85°C operating temperature range assured design, characterization correlation with statistical process controls. LT1933I specifications
guaranteed over -40°C 125°C temperature range. LT1933H specifications guaranteed over -40°C 150°C temperature range. Note Current limit guaranteed design and/or correlation static test. Slope compensation reduces current limit higher duty cycle. Note Current flows pin. Note Current flows into pin.
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LT1933 TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency, VOUT
25°C VOUT EFFICIENCY
Efficiency, VOUT 3.3V
25°C VOUT 3.3V SWITCH CURRENT LIMIT (mA) 1200 1000
Switch Current Limit
25°C TYPICAL
EFFICIENCY
MINIMUM
MBRM140 Toko D53LCB LOAD CURRENT (mA)
1933
MBRM140 Toko D53LCB LOAD CURRENT (mA)
1933
DUTY CYCLE
1933
Maximum Load Current
25°C VOUT LOAD CURRENT (mA)
Maximum Load Current
25°C VOUT 3.3V SWITCH VOLTAGE (mV)
Switch Voltage Drop
LOAD CURRENT (mA)
25°C
85°C -40°C
INPUT VOLTAGE
1933
INPUT VOLTAGE
1933
SWITCH CURRENT
1933
Feedback Voltage
1.260 1.255 FEEDBACK VOLTAGE 1.250 UVLO 1.245 1.240 1.235 1.230
Undervoltage Lockout
SWITCHING FREQUENCY (kHz)
Switching Frequency
TEMPERATURE (°C)
1933
TEMPERATURE (°C)
1933
TEMPERATURE (°C)
1933
1933fd
LT1933 TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Foldback
SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT VOLTAGE
1933
Soft-Start
SHDN VOLTAGE
1933
SHDN Current
25°C
25°C
25°C SHDN CURRENT
SHDN VOLTAGE
1933
Typical Minimum Input Voltage
VOUT 25°C INPUT VOLTAGE START
Typical Minimum Input Voltage
VOUT 3.3V 25°C START SWITCH CURRENT LIMIT
Switch Current Limit
INPUT VOLTAGE
LOAD CURRENT (mA)
1933
LOAD CURRENT (mA)
1933
TEMPERATURE (°C)
1933
Operating Waveforms
VOUT1 1.8V
Operating Waveforms, Discontinuous Mode
VOUT1 1.8V
10V/DIV
10V/DIV
200mA/DIV
VOUT2 1.2V
200mA/DIV
VOUT2 1.2V
VOUT 10mV/DIV
1933
VOUT 10mV/DIV
1933
12V, VOUT 3.3V, IOUT 400mA, 22H, COUT
12V, VOUT 3.3V, IOUT 20mA, 22H, COUT
1933fd
LT1933 FUNCTIONS
(SOT-23/DFN)
BOOST (Pin BOOST used provide drive voltage, higher than input voltage, internal bipolar power switch. (Pin 2/Pin Exposed Pad, local ground plane below LT1933 circuit components. Return feedback divider this pin. (Pin 3/Pin LT1933 regulates feedback 1.245V. Connect feedback resistor divider this pin. output voltage according VOUT 1.245V R1/R2). good value 10k.
SHDN (Pin SHDN used LT1933 shutdown mode. ground shut down LT1933. 2.3V more normal operation. shutdown feature used, this pin. SHDN also provides soft-start function; Applications Information section. (Pin 5/Pin supplies current LT1933's internal regulator internal power switch. This must locally bypassed. (Pin output internal power switch. Connect this inductor, catch diode boost capacitor.
BLOCK DIAGRAM
UVLO
SHDN
SLOPE COMP
BOOST
DRIVER VOUT
FREQUENCY FOLDBACK
1.245V
1933
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LT1933 OPERATION
(Refer Block Diagram)
LT1933 constant frequency, current mode step down regulator. 500kHz oscillator enables flipflop, turning internal 750mA power switch amplifier comparator monitor current flowing between pins, turning switch when this current reaches level determined voltage error amplifier measures output voltage through external resistor divider tied servos node. error amplifier's output increases, more current delivered output; decreases, less current delivered. active clamp (not shown) node provides current limit. node also clamped voltage SHDN pin; soft-start implemented generating voltage ramp SHDN using external resistor capacitor.
internal regulator provides power control circuitry. This regulator includes undervoltage lockout prevent switching when less than ~3.35V. SHDN used place LT1933 shutdown, disconnecting output reducing input current less than switch driver operates from either input from BOOST pin. external capacitor diode used generate voltage BOOST that higher than input supply. This allows driver fully saturate internal bipolar power switch efficient operation. oscillator reduces LT1933's operating frequency when voltage low. This frequency foldback helps control output current during startup overload.
APPLICATIONS INFORMATION
Resistor Network output voltage programmed with resistor divider between output pin. Choose resistors according R2(VOUT/1.245 should less avoid bias current errors. Reference designators refer Block Diagram. Input Voltage Range input voltage range LT1933 applications depends output voltage absolute maximum ratings BOOST pins. minimum input voltage determined either LT1933's minimum operating voltage ~3.35V, maximum duty cycle. duty cycle fraction time that internal switch determined input output voltages: (VOUT VD)/(VIN where forward voltage drop catch diode (~0.4V) voltage drop internal switch (~0.4V maximum load). This leads minimum input voltage VIN(MIN) (VOUT VD)/DCMAX with DCMAX 0.88 maximum input voltage determined absolute maximum ratings BOOST pins minimum duty cycle DCMIN 0.08 (corresponding minimum time 130ns): VIN(MAX) (VOUT VD)/DCMIN Note that this restriction operating input voltage; circuit will tolerate transient inputs absolute maximum ratings BOOST pins. Inductor Selection Maximum Output Current good first choice inductor value (VOUT where voltage drop catch diode (~0.4V) With this value maximum load current will above 500mA. inductor's current rating must greater than your maximum load current
1933fd
LT1933 APPLICATIONS INFORMATION
saturation current should about higher. robust operation fault conditions saturation current should ~1A. keep efficiency high, series resistance (DCR) should less than 0.2. Table lists several vendors types that suitable. course, such simple design guide will always result optimum inductor your application. larger value provides slightly higher maximum load current, will reduce output voltage ripple. your load lower than 500mA, then decrease value inductor operate with higher ripple current. This allows physically smaller inductor, with lower resulting higher efficiency. There several graphs Typical Performance Characteristics section this data sheet that show maximum load current function input voltage inductor value several popular output voltages. inductance result discontinuous mode operation, which further reduces maximum load current. details maximum output current discontinuous mode operation, Linear Technology Application Note Finally, duty cycles greater than (VOUT/VIN 0.5), there minimum inductance required avoid subharmonic oscillations. Choosing greater than 3(VOUT prevents subharmonic oscillations duty cycles. Catch Diode 0.5A Schottky diode recommended catch diode, diode must have reverse voltage rating equal greater than maximum input voltage. Semiconductor MBR0540 good choice; rated 0.5A forward current maximum reverse voltage 40V. MBRM140 provides better efficiency, will handle extended overload conditions. Input Capacitor Bypass input LT1933 circuit with 2.2F higher value ceramic capacitor type. types have poor performance over temperature applied voltage, should used. 2.2F ceramic adequate bypass LT1933 will easily handle ripple current. However, input power source high impedance, there significant inductance long wires cables, additional bulk capacitance necessary. This provided with performance electrolytic capacitor. Step-down regulators draw current from input supply pulses with very fast rise fall times. input capacitor required reduce resulting voltage ripple LT1933 force this very high frequency
Table 1.Inductor Vendors
Vendor Coilcraft www.coilcraft.com Part Series D01608C MSS5131 MSS6122 Sumida www.sumida.com CR43 CDRH4D28 CDRH5D28 Toko Elektronik www.toko.com www.we-online.com D52LC D53LC WE-TPC WE-PD4 WE-PD2 Inductance Range Size (mm)
1933fd
LT1933 APPLICATIONS INFORMATION
switching current into tight local loop, minimizing EMI. 2.2F capacitor capable this task, only placed close LT1933 catch diode; Layout section. second precaution regarding ceramic input capacitor concerns maximum input voltage rating LT1933. ceramic input capacitor combined with trace cable inductance forms high quality (under damped) tank circuit. LT1933 circuit plugged into live supply, input voltage ring twice nominal value, possibly exceeding LT1933's voltage rating. This situation easily avoided; Plugging Safely section. Output Capacitor output capacitor essential functions. Along with inductor, filters square wave generated LT1933 produce output. this role determines output ripple, impedance switching frequency important. second function store energy order satisfy transient loads stabilize LT1933's control loop. Ceramic capacitors have very equivalent series resistance (ESR) provide best ripple performance. good value COUT 60/VOUT where COUT types, keep mind that ceramic capacitor biased with VOUT will have less than nominal capacitance. This choice will provide output ripple good transient response. Transient performance improved with high value capacitor, phase lead capacitor across feedback resistor required full benefit (see Compensation section). High performance electrolytic capacitors used output capacitor. important, choose that intended switching regulators. should specified supplier, should less. Such capacitor will larger than ceramic capacitor will have larger capacitance, because capacitor must large achieve ESR. Table lists several capacitor vendors.
Table 2.Inductor Vendors
Vendor Panasonic Phone (714) 373-7366 www.panasonic.com Part Series Ceramic, Polymer, Tantalum Ceramic, Tantalum Ceramic, Polymer, Tantalum Ceramic Ceramic, Tantalum Ceramic Series Comments Series
Kemet Sanyo
(864) 963-6300 (408) 749-9714
www.kemet.com www.sanyovideo.com
T494, T495 POSCAP
Murata Taiyo Yuden
(404)436-1300
www.murata.com www.avxcorp.com
(864)963-6300
www.taiyo-yuden.com
1933fd
LT1933 APPLICATIONS INFORMATION
Figure shows transient response LT1933 with several output capacitor choices. output 3.3V. load current stepped from 100mA 400mA back 100mA, oscilloscope traces show output voltage. upper photo shows recommended value. second photo shows improved response (less voltage drop) resulting from larger output capacitor phase lead capacitor. last photo shows response high performance electrolytic capacitor. Transient performance improved large output capacitance, output ripple shown broad trace) increased because higher this capacitor.
VOUT 16.5k
VOUT 50mV/DIV
IOUT 200mA/DIV
1933 F01a
VOUT 16.5k 470pF
VOUT 50mV/DIV
IOUT 200mA/DIV
1933 F01b
VOUT 16.5k
VOUT 50mV/DIV
100F SANYO 4TPB100M
1933 F01c
IOUT 200mA/DIV
Figure Transient Load Response LT1933 with Different Output Capacitors Load Current Stepped from 100mA 400mA. 12V, VOUT 3.3V, 22H.
1933fd
LT1933 APPLICATIONS INFORMATION
BOOST Considerations Capacitor diode used generate boost voltage that higher than input voltage. most cases 0.1F capacitor fast switching diode (such 1N4148 1N914) will work well. Figure shows ways arrange boost circuit. BOOST must least 2.3V above best efficiency. outputs above, standard circuit (Figure best. outputs between 2.5V 0.47F capacitor small Schottky diode (such BAT-54). lower output voltages boost diode tied input (Figure 2b). circuit Figure more efficient because BOOST current comes from lower voltage source. must also sure that maximum voltage rating BOOST exceeded.
minimum operating voltage LT1933 application limited undervoltage lockout (~3.35V) maximum duty cycle outlined above. proper startup, minimum input voltage also limited boost circuit. input voltage ramped slowly, LT1933 turned with SHDN when output already regulation, then boost capacitor fully charged. Because boost capacitor charged with energy stored inductor, circuit will rely some minimum load current boost circuit running properly. This minimum load will depend input output voltages, arrangement boost circuit. minimum load generally goes zero once circuit started. Figure shows plot minimum load start function input voltage. many
VOUT
BOOST LT1933 VBOOST VOUT VBOOST VOUT (2a)
VOUT
BOOST LT1933
1933 F02a
VBOOST VBOOST 2VIN (2b)
1933 F02b
Figure Circuits Generating Boost Voltage
Minimum Input Voltage VOUT 3.3V
START INPUT VOLTAGE LOAD CURRENT (mA)
1933 F03a
Minimum Input Voltage VOUT
START INPUT VOLTAGE LOAD CURRENT (mA)
1933 F03b
VOUT 3.3V 25°C
VOUT 25°C
Figure Minimum Input Voltage Depends Output Voltage, Load Current Boost Circuit
1933fd
LT1933 APPLICATIONS INFORMATION
cases discharged output capacitor will present load switcher which will allow start. plots show worst-case situation where ramping very slowly. lower start-up voltage, boost diode tied VIN; however, this restricts input range one-half absolute maximum rating BOOST pin. light loads, inductor current becomes discontinuous effective duty cycle very high. This reduces minimum input voltage approximately 300mV above VOUT. higher load currents, inductor current continuous duty cycle limited maximum duty cycle LT1933, requiring higher input voltage maintain regulation. Soft-Start SHDN used soft-start LT1933, reducing maximum input current during start SHDN driven through external filter create voltage ramp this pin. Figure shows start waveforms with without soft-start circuit. choosing large time constant, peak start current reduced current that required regulate output, with overshoot. Choose value resistor that supply when SHDN reaches 2.3V.
5V/DIV SHDN 100mA/DIV VOUT 5V/DIV 50s/DIV
1933 F04a
SHDN 0.1F
5V/DIV
1933 F04b
100mA/DIV VOUT 5V/DIV 0.5ms/DIV
Figure Soft-Start LT1933, Resistor Capacitor SHDN Pin. VINI 12V, VOUT 3.3V, COUT RLOAD
1933fd
LT1933 APPLICATIONS INFORMATION
Shorted Reversed Input Protection inductor chosen that won't saturate excessively, LT1933 buck regulator will tolerate shorted output. There another situation consider systems where output will held high when input LT1933 absent. This occur battery charging applications battery backup systems where battery some other supply diode OR-ed with LT1933's output. allowed float SHDN held high (either logic signal because tied VIN), then LT1933's internal circuitry will pull quiescent current through pin. This fine your system tolerate this state. ground SHDN pin, current will drop essentially zero. However, grounded while output held high, then parasitic diodes inside LT1933 pull large currents from output through pin. Figure shows circuit that will only when input voltage present that protects against shorted reversed input. Plugging Safely small size, robustness impedance ceramic capacitors make them attractive option input bypass capacitor LT1933 circuits. However, these capacitors cause problems LT1933 plugged into live supply (see Linear Technology Application Note complete discussion). loss ceramic capacitor combined with stray inductance series with power source forms under damped tank circuit, voltage LT1933 ring twice nominal input voltage, possibly exceeding LT1933's rating damaging part. input supply poorly controlled user will plugging LT1933 into energized supply, input network should designed prevent this overshoot.
BOOST LT1933 SHDN VOUT
BACKUP
1933
MBR0540
Figure Diode Prevents Shorted Input from Discharging Backup Battery Tied Output; Also Protects Circuit from Reversed Input. LT1933 Only When Input Present
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LT1933 APPLICATIONS INFORMATION
CLOSING SWITCH SIMULATES PLUG LT1933
DANGER! 20V/DIV RINGING EXCEED ABSOLUTE MAXIMUM RATING LT1933
2.2F
IMPEDANCE ENERGIZED SUPPLY
STRAY INDUCTANCE FEET METERS) TWISTED PAIR
5A/DIV 20s/DIV
(6a)
LT1933
AI.EI.
2.2F
20V/DIV
5A/DIV 20s/DIV
(6b)
LT1933
0.1F 2.2F
20V/DIV
5A/DIV 20s/DIV
1933
(6c) Figure Well Chosen Input Network Prevents Input Voltage Overshoot Ensures Reliable Operation When LT1933 Connected Live Supply
1933fd
LT1933 APPLICATIONS INFORMATION
Figure shows waveforms that result when LT1933 circuit connected supply through feet 24-gauge twisted pair. first plot response with 2.2F ceramic capacitor input. input voltage rings high input current peaks 20A. method damping tank circuit another capacitor with series resistor circuit. Figure aluminum electrolytic capacitor been added. This capacitor's high equivalent series resistance damps circuit eliminates voltage overshoot. extra capacitor improves frequency ripple filtering slightly improve efficiency circuit, though likely largest component circuit. alternative solution shown Figure resistor added series with input eliminate voltage overshoot also reduces peak input current). 0.1F capacitor improves high frequency filtering. This solution smaller less expensive than electrolytic capacitor. high input voltages impact efficiency minor, reducing efficiency less than half percent output full load operating from 24V. Frequency Compensation LT1933 uses current mode control regulate output. This simplifies loop compensation. particular, LT1933 does require output capacitor stability allowing ceramic capacitors achieve output ripple small circuit size.
LT1933 0.7V
Figure shows equivalent circuit LT1933 control loop. error transconductance amplifier with finite output impedance. power section, consisting modulator, power switch inductor, modeled transconductance amplifier generating output current proportional voltage node. Note that output capacitor integrates this current, that capacitor node (CC) integrates error amplifier output current, resulting poles loop. provides zero. With recommended output capacitor, loop crossover occurs above RCCC zero. This simple model works well long value inductor high loop crossover frequency much lower than switching frequency. With larger ceramic capacitor (very ESR), crossover lower phase lead capacitor (CPL) across feedback divider improve phase margin transient response. Large electrolytic capacitors have large enough create additional zero, phase lead necessary. output capacitor different than recommended capacitor, stability should checked across operating conditions, including load current, input voltage temperature. LT1375 data sheet contains more thorough discussion loop compensation describes test stability using transient load.
1.1mho 100k 80pF
CURRENT MODE POWER STAGE
150mhos ERROR AMPLIFIER 500k
Figure Model Loop Response
1933fd
1.245V
1933
LT1933 APPLICATIONS INFORMATION
Layout proper operation minimum EMI, care must taken during printed circuit board layout. Figure shows recommended component placement with trace, ground plane locations. Note that large, switched currents flow LT1933's pins, catch diode (D1) input capacitor (C2). loop formed these components should small possible tied system ground only place. These components, along with inductor output capacitor, should placed same side circuit board, their connections should made that layer. Place local, unbroken ground plane below these components, this ground plane system ground location, ideally ground terminal output capacitor BOOST nodes should small possible. Finally, keep node small that ground ground traces will shield from BOOST nodes. Include vias near LT1933 help remove heat from LT1933 ground plane. Figure shows layout package. Vias near under exposed attach paddle minimize thermal resistance LT1933.
VOUT
VIAS
1933 F08a
(8a) Package
SHUTDOWN VOUT SYSTEM GROUND
VIAS OUTLINE LOCAL GROUND PLANE
1933 F08b
(8b) SOT-23 Package Figure Good Layout Ensures Proper, Operation
1933fd
LT1933 TYPICAL APPLICATIONS
3.3V Step-Down Converter
4.5V BOOST LT1933 SHDN 16.5k 6.3V
1933 TA02b
0.1F
VOUT 3.3V/ 500mA
2.2F
Step-Down Converter
14.5V BOOST LT1933 SHDN 86.6k
1933 TA02d
0.1F
VOUT 12V/ 450mA
2.2F
1933fd
LT1933 PACKAGE DESCRIPTION
Package 6-Lead Plastic (2mm 3mm)
(Reference 05-08-1715)
0.70 ±0.05
3.55 ±0.05
1.65 ±0.05 SIDES) PACKAGE OUTLINE
2.15 ±0.05
0.25 0.05 0.50 1.35 ±0.05 SIDES) RECOMMENDED SOLDER PITCH DIMENSIONS 2.00 ±0.10 SIDES) 0.115 0.40 0.10
0.05
3.00 ±0.10 SIDES) MARK (SEE NOTE
1.65 0.10 SIDES) NOTCH R0.20 0.25 CHAMFER
(DCB6) 0405
0.200
0.75 ±0.05
0.25 0.05 0.50 1.35 ±0.10 SIDES)
0.00 0.05
BOTTOM VIEW-EXPOSED
NOTE: DRAWING MADE JEDEC PACKAGE OUTLINE M0-229 VARIATION (TBD) DRAWING SCALE DIMENSIONS MILLIMETERS DIMENSIONS EXPOSED BOTTOM PACKAGE INCLUDE MOLD FLASH. MOLD FLASH, PRESENT, SHALL EXCEED 0.15mm SIDE EXPOSED SHALL SOLDER PLATED SHADED AREA ONLY REFERENCE LOCATION BOTTOM PACKAGE
1933fd
LT1933 PACKAGE DESCRIPTION
Package 6-Lead Plastic SOT-23
(Reference 05-08-1634)
0.62
0.95
2.80 3.10 (NOTE
1.22
3.85 2.62
2.60 3.00 1.50 1.75 (NOTE
RECOMMENDED SOLDER LAYOUT CALCULATOR
0.95
0.25 0.50 PLCS NOTE
0.90 1.30 0.20 0.90 1.45 DATUM
0.35 0.55
NOTE: DIMENSIONS MILLIMETERS DRAWING SCALE DIMENSIONS INCLUSIVE PLATING DIMENSIONS EXCLUSIVE MOLD FLASH METAL BURR MOLD FLASH SHALL EXCEED 0.254mm PACKAGE EIAJ REFERENCE SC-74A (EIAJ)
0.09 0.20 (NOTE
1.90
0.09 0.15 NOTE
SOT-23 0502
ATTENTION: ORIGINAL SOT23-6L PACKAGE. MOST SOT23-6L PRODUCTS CONVERTED THIN SOT23 PACKAGE, DRAWING 05-08-1636 AFTER APPROXIMATELY APRIL 2001 SHIP DATE
1933fd
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.
LT1933 TYPICAL APPLICATION
2.5V Step-Down Converter
3.6V BOOST LT1933 SHDN 10.5k
1933 TA03
0.47F
VOUT 2.5V/500mA
2.2F
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60V, 1.2A IOUT, 200kHz, High Efficiency Step-Down DC/DC VIN: 5.5V 60V, VOUT(MIN) 1.2V, 2.5mA, 25A, Converter TSSOP16/TSSOP16E Packages 25V, 1.2A IOUT, 1.25MHz, High Efficiency Step-Down DC/DC Converter 40V, 550mA IOUT, 200kHz, High Efficiency Step-Down DC/DC Converter 25V, Dual 1.4A IOUT, 1.1MHz, High Efficiency Step-Down DC/DC Converter 60V, Dual 1.2A IOUT, 500kHz, High Efficiency Step-Down DC/DC Converter 60V, Dual 1.2A IOUT, 200kHz, High Efficiency Step-Down DC/DC Converter with Burst Mode® 80V, 50mA, Noise Linear Regulator Dual 600mA IOUT, 1.5MHz, Synchronous Step-Down DC/DC Converter 2.5A IOUT, 4MHz, Synchronous Step-Down DC/DC Converter VIN: 25V, VOUT(MIN) 1.2V, 1mA, MS8/MS8E Packages VIN: 7.4V 40V, VOUT(MIN) 1.24V, 3.2mA, 30A, Packages VIN: 3.6V 25V, VOUT(MIN) 1.25V, 3.8mA, <30A, TSSOP16E Package VIN: 5.5V 60V, VOUT(MIN) 1.2V, 2.5mA, 25A, TSSOP16/TSSOP16E Packages VIN: 3.3V 60V, VOUT(MIN) 1.2V, 100A, <1A, TSSOP16E Package VIN: 1.5V 80V, VOUT(MIN) 1.28V, 30A, <1A, MS8E Package VIN: 2.5V 5.5V, VOUT(MIN) =0.6V, 40A, <1A, MS10E Package VIN: 2.5V 5.5V, VOUT(MIN) =0.8V, 60A, <1A, TSSOP16E Package
IOUT, 4MHz, Synchronous Step-Down DC/DC Converter VIN: 2.3V 5.5V, VOUT(MIN) =0.8V, 64A, <1A, TSSOP20E Package 60V, 2.75A IOUT, 200kHz/500kHz, Synchronous Step-Down VIN: 5.5V 60V, VOUT(MIN) =1.2V, 2.5mA, 30A, DC/DC Converter TSSOP16E Package
Burst Mode registered trademark Linear Technology Corporation.
1933fd
Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
0108 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2007
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