LT1930/LT1930A 1.2MHz/2.2MHz, Step-Up DC/DC Converters ThinSOT DESCRIP
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LT1930/LT1930A 1.2MHz/2.2MHz, Step-Up DC/DC Converters ThinSOT DESCRIPTIO
LT®1930 LT1930A industry's highest power SOT-23 switching regulators. Both include internal switch allowing high current outputs generated small footprint. LT1930 switches 1.2MHz, allowing tiny, cost height capacitors inductors. faster LT1930A switches 2.2MHz, enabling further reductions inductor size. Complete regulator solutions approaching tenth square inch area achievable with these devices. Multiple output power supplies separate regulator each output voltage, replacing cumbersome quasi-regulated approaches using single regulator custom transformers. constant frequency internally compensated current mode architecture results low, predictable output noise that easy filter. ceramic capacitors used output, further reducing noise millivolt level. high voltage switch LT1930/LT1930A rated 36V, making device ideal boost converters well single-ended primary inductance converter (SEPIC) flyback designs. LT1930 generate 480mA from 3.3V supply 300mA from four alkaline cells SEPIC design. LT1930/LT1930A available 5-lead ThinSOT package.
1.2MHz Switching Frequency (LT1930) 2.2MHz Switching Frequency (LT1930A) VCESAT Switch: 400mV High Output Voltage: 480mA from 3.3V Input (LT1930) 250mA from Input (LT1930A) Wide Input Range: 2.6V Uses Small Surface Mount Components Shutdown Current: Profile (1mm) ThinSOTPackage Pin-for-Pin Compatible with LT1613
APPLICATIO
TFT-LCD Bias Supply Digital Cameras Cordless Phones Battery Backup Medical Diagnostic Equipment Local Supply External Modems Cards xDSL Power Supply
registered trademarks Linear Technology Corporation ThinSOT trademark Linear Technology Corporation.
TYPICAL APPLICATIO
2.2µF SHDN 10µH LT1930 SHDN
VOUT 300mA 3.3V
113k
EFFICIENCY
10pF
4.7µF
13.3k
TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN EMK316BJ475ML SEMICONDUCTOR MBR0520 SUMIDA CR43-100 *OPTIONAL
1930/A
LOAD CURRENT (mA)
1930 TA01
Figure 12V, 300mA Step-Up DC/DC Converter
Efficiency
LT1930/LT1930A
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW SHDN
Voltage Voltage 0.4V Voltage 2.5V Current Into ±1mA SHDN Voltage Maximum Junction Temperature 125°C Operating Temperature Range (Note 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LT1930ES5 LT1930AES5 PART MARKING LTKS LTSQ
PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX 125°C, 256°C/
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN unless otherwise noted. (Note
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage
CONDITIONS
LT1930 2.45
1.270 1.280 0.05
LT1930A 2.45
1.270 1.280 0.05
UNITS
1.240 1.230
1.255 0.01 0.01
1.240 1.230
1.255 0.01 0.01
Bias Current Quiescent Current Quiescent Current Shutdown Reference Line Regulation Switching Frequency
1.255V VSHDN 2.4V, Switching VSHDN 2.6V
0.85
0.01
0.01
Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage SHDN Bias Current VSHDN VSHDN (Note
Note Absolute Maximum Ratings those values beyond which life device impaired. Note LT1930E/LT1930AE guaranteed meet performance specifications from 70°C. Specifications over 40°C 85°C
operating temperature range assured design, characterization correlation with statistical process controls. Note Current limit guaranteed design and/or correlation static test.
LT1930/LT1930A TYPICAL PERFOR CHARACTERISTICS
Quiescent Current
SWITCHING
QUIESCENT CURRENT (mA) 1.27 SHDN CURRENT (µA) 1.28
TEMPERATURE (°C)
1.23 1.22
LT1930A
VOLTAGE
LT1930
Current Limit
0.45 0.40 0.35 0.30
CURRENT
VCESAT
DUTY CYCLE
FREQUENCY (MHz)
CTIO
(Pin Switch Pin. Connect inductor/diode here. Minimize trace area this reduce EMI. (Pin Ground. directly local ground plane. (Pin Feedback Pin. Reference voltage 1.255V. Connect resistive divider here. Minimize trace area VOUT according VOUT 1.255V(1 R1/R2). SHDN (Pin Shutdown Pin. 2.4V more enable device. Ground shut down. (Pin Input Supply Pin. Must locally bypassed.
1930/A
1930/A
Voltage
TEMPERATURE (°C)
SHDN Current
LT1930A
1.26 1.25 1.24
LT1930
SHDN VOLTAGE
1930/A
1930/A
Switch Saturation Voltage
SWITCH CURRENT
Oscillator Frequency
LT1930A
0.25 0.20 0.15 0.10 0.05
LT1930
TEMPERATURE (°C)
1930/A
1930/A
LT1930/LT1930A
BLOCK DIAGRA
VOUT (EXTERNAL) (EXTERNAL)
RAMP GENERATOR
SHUTDOWN
SHDN
1.2MHz OSCILLATOR* *2.2MHz LT1930A
Figure Block Diagram
OPERATIO
LT1930 uses constant frequency, current-mode control scheme provide excellent line load regulation. Operation best understood referring block diagram Figure start each oscillator cycle, latch set, which turns power switch voltage proportional switch current added stabilizing ramp resulting into positive terminal comparator When this voltage exceeds level negative input latch reset turning power switch. level negative input error amplifier simply amplified version difference between feedback voltage reference voltage 1.255V.
this manner, error amplifier sets correct peak current level keep output regulation. error amplifier's output increases, more current delivered output; decreases, less current delivered. LT1930 current limit circuit shown Figure switch current constantly monitored allowed exceed maximum switch current (typically 1.2A). switch current reaches this value, latch reset regardless state comparator This current limit helps protect power switch well external components connected LT1930. block diagram LT1930A (not shown) identical except that oscillator frequency 2.2MHz.
1.255V REFERENCE
COMPARATOR DRIVER
0.01
1930/A
LT1930/LT1930A
APPLICATIONS INFORMATION
LT1930 LT1930A DIFFERENCES Switching Frequency difference between LT1930 LT1930A faster switching frequency LT1930A. 2.2MHz, LT1930A switches nearly twice rate LT1930. Care must taken deciding which part use. high switching frequency LT1930A allows smaller cheaper inductors capacitors used given application, with slight decrease efficiency maximum output current when compared LT1930. Generally, efficiency maximum output current critical, LT1930 should used. application size cost more important, LT1930A will better choice. many applications, tiny inexpensive chip inductors used with LT1930A, reducing solution cost. Duty Cycle maximum duty cycle (DC) LT1930A compared LT1930. duty cycle given application using boost topology given
ELT5KT4R7M ELT5KT6R8M
VOUT
application, 58.3% indicating that LT1930A could used. application 79.2% making LT1930 right choice. LT1930A still used applications where calculated above, above 75%. However, part must operated discontinuous conduction mode that actual duty cycle reduced. INDUCTOR SELECTION Several inductors that work well with LT1930 listed Table those LT1930A listed Table These tables complete, there many other manufacturers devices that used. Consult each manufacturer more detailed information their entire selection related parts, many different sizes shapes available. Ferrite core inductors should used obtain best efficiency, core losses 1.2MHz much lower ferrite cores than cheaper powdered-
iron types. Choose inductor that handle least without saturating, ensure that inductor (copper-wire resistance) minimize power losses. 4.7µH 10µH inductor will best choice most LT1930 designs. LT1930A designs, 2.2µH 4.7µH inductor will usually suffice. Note that some applications, current handling requirements inductor lower, such SEPIC topology where each inductor only carries one-half total switch current.
Table Recommended Inductors LT1930
(µH) SIZE (mm)
PART CDRH5D18-4R1 CDRH5D18-100 CR43-4R7 CR43-100 DS1608-472 DS1608-103
VENDOR Sumida (847) 956-0666 www.sumida.com Coilcraft (847) 639-6400 www.coilcraft.com Panasonic (408) 945-5660 www.panasonic.com
Table Recommended Inductors LT1930A
(µH) SIZE (mm)
PART LQH3C2R2M24 LQH3C4R7M24 CR43-2R2 CR43-3R3 1008PS-272 1008PS-332 ELT5KT3R3M
VENDOR Murata (404) 573-4150 www.murata.com Sumida (847) 956-0666 www.sumida.com Coilcraft (800) 322-2645 www.coilcraft.com Panasonic (408) 945-5660 www.panasonic.com
inductors shown Table with LT1930A were chosen small size. better efficiency, similar valued inductors with larger volume. example, Sumida CR43 series values ranging from 2.2µH 4.7µH will give LT1930A application percentage points increase efficiency, compared smaller Murata LQH3C Series.
LT1930/LT1930A
APPLICATIONS INFORMATION
CAPACITOR SELECTION (equivalent series resistance) capacitors should used output minimize output ripple voltage. Multi-layer ceramic capacitors excellent choice, they have extremely available very small packages. dielectrics preferred, followed X7R, these materials retain capacitance over wide voltage temperature ranges. 4.7µF 10µF output capacitor sufficient most applications, systems with very output currents need only 2.2µF output capacitor. Solid tantalum OSCON capacitors used, they will occupy more board area than ceramic will have higher ESR. Always capacitor with sufficient voltage rating. Ceramic capacitors also make good choice input decoupling capacitor, which should placed close possible LT1930/LT1930A. 4.7µF input capacitor sufficient most applications. Table shows list several ceramic capacitor manufacturers. Consult manufacturers detailed information their entire selection ceramic parts.
Table Ceramic Capacitor Manufacturers
Taiyo Yuden Murata (408) 573-4150 (803) 448-9411 (714) 852-2001 www.t-yuden.com www.avxcorp.com www.murata.com
decision either (ceramic) capacitors higher (tantalum OSCON) capacitors affect stability overall system. capacitor, along with capacitance itself, contributes zero system. tantalum OSCON capacitors, this zero located lower frequency higher value ESR, while zero ceramic capacitor much higher frequency generally ignored. phase lead zero intentionally introduced placing capacitor (C3) parallel with resistor (R1) between VOUT shown Figure frequency zero determined following equation.
choosing appropriate values resistor capacitor, zero frequency designed improve phase margin overall converter. typical target value zero frequency between 35kHz 55kHz. Figure shows transient response stepup converter from Figure without phase lead capacitor phase margin reduced evidenced more ringing both output voltage inductor current. 10pF capacitor results better phase margin, which revealed Figure more damped response less overshoot. Figure shows transient response when 33µF tantalum capacitor with phase lead capacitor used output. higher output voltage ripple revealed upper waveform double lines. transient response greatly improved which implies that zero frequency high increase phase margin.
VOUT 0.2V/DIV COUPLED 0.5A/DIV COUPLED LOAD 250mA CURRENT 150mA 50µs/DIV
1930
Figure Transient Response Figure Step-Up Converter without Phase Lead Capacitor
VOUT 0.2V/DIV COUPLED 0.5A/DIV COUPLED LOAD 250mA CURRENT 150mA 50µs/DIV
1930
Figure Transient Response Figure Step-Up Converter with 10pF Phase Lead Capacitor
LT1930/LT1930A
APPLICATIONS INFORMATION
VOUT 0.2V/DIV COUPLED
0.5A/DIV COUPLED LOAD 250mA CURRENT 150mA 200µs/DIV
1930
Figure Transient Response Step-Up Converter with 33µF Tantalum Output Capacitor Phase Lead Capacitor
VOUT
DIODE SELECTION Schottky diode recommended with LT1930/ LT1930A. Motorola MBR0520 very good choice. Where switch voltage exceeds 20V, MBR0530 diode). Where switch voltage exceeds 30V, MBR0540 diode). These diodes rated handle average forward current 0.5A. applications where average forward current diode exceeds 0.5A, Microsemi UPS5817 rated recommended. SETTING OUTPUT VOLTAGE output voltage, select values (see Figure according following equation.
1.255V
good value 13.3k which sets current resistor divider chain 1.255V/13.3k 94.7µA.
121k LT1930 SHDN
1930
Figure Keeping SHDN Below
LAYOUT HINTS high speed operation LT1930/LT1930A demands careful attention board layout. will advertised performance with careless layout. Figure shows recommended component placement.
SHUTDOWN
1930
Figure Suggested Layout
Driving SHDN Above maximum voltage allowed SHDN 10V. wish higher voltage, must place resistor series with SHDN. good value 121k. Figure shows circuit where SHDN obtained from VIN. voltage SHDN kept below 10V.
VOUT
LT1930/LT1930A
TYPICAL APPLICATIO
4-Cell SEPIC Converter
6.5V 2.2µF 4-CELL BATTERY SHDN LT1930 SHDN 82.5k 10µH 243k 10µH 10µF VOUT 300mA
EFFICIENCY
TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN JMK316BJ106ML SEMICONDUCTOR MBR0520 TAIYO-YUDEN LMK212BJ105MG MURATA LQH3C100K24
4-Cell SEPIC Converter with Coupled Inductors
6.5V 2.2µF 4-CELL BATTERY SHDN LT1930 SHDN TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN JMK316BJ106ML TAIYO-YUDEN LMK212BJ105MG SEMICONDUCTOR MBR0520 SUMIDA CLS62-100
1930/A TA03
10µH
2.2µF
TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN EMK316BJ225ML TAIYO-YUDEN TMK316BJ105ML (408) 573-4150 SEMICONDUCTOR MBR0520 (800) 282-9855 SUMIDA CR43-3R3 (874) 956-0666
Efficiency
1930 TA02a
6.5V
LOAD CURRENT (mA)
1930 TA02b
Boost Converter
VOUT 300mA
4.7µF 10µH LT1930 SHDN TAIYO-YUDEN EMK316BJ475ML TAIYO-YUDEN JMK212BJ475MG SEMICONDUCTOR MBR0530 SUMIDA CR43-100 36.5k 665k 2.2µF VOUT 90mA
243k 82.5k
10µH 10µF
SHDN
1930/A TA04
±15V Dual Output Converter with Output Disconnect
3.3µH LT1930 SHDN 13.3k 2.2µF
1930/A TA05
70mA 147k 2.2µF
-15V 70mA
LT1930/LT1930A
TYPICAL APPLICATIO
Boost Converter with Reverse Battery Protection
2.2µF LT1930 SHDN SHDN TAIYO-YUDEN LMK432BJ226MM TAIYO-YUDEN LMK212BJ225MG SEMICONDUCTOR MBR0520 SUMIDA CR43-4R7 SILICONIX Si6433DQ 11.3k 4.7µH 60.4k 47pF VOUT 520mA 240mA
3.3V Boost Converter
3.3V 4.7µF 5.6µH LT1930 SHDN 13.3k 40.2k 10µF
EFFICIENCY
TAIYO-YUDEN JMK212BJ475MG www.t-yuden.com TAIYO-YUDEN JMK316BJ106ML SEMICONDUCTOR MBR0520 www.onsemi.com SUMIDA CR43-5R6 www.sumida.com
12V, 250mA Step-Up Converter
2.2µH 2.2µF SHDN LT1930A SHDN TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN EMK316BJ225ML SEMICONDUCTOR MBR0520 MURATA LQH3C2R2M24 13.3k 115k 2.2µF
EFFICIENCY
22µF
1930/A TA06
Efficiency
VOUT 480mA
3.3V
2.6V
1930/A TA07a
LOAD CURRENT (mA)
1930/A TA07b
Efficiency
VOUT 250mA
VOUT
1930/A TA08a
LOAD CURRENT (mA)
1930/A TA08b
LT1930/LT1930A
TYPICAL APPLICATIO
18V, Triple Output TFT-LCD Bias Supply with Soft-Start
0.1µF 3.3V 2.2µF 3.3V 68nF X7R, 6.3V C2,C3, X7R, X7R, BAT54S EQUIVALENT MBR0520 EQUIVALENT PANASONIC ELT5KT4R7M 4.7µH LT1930 SHDN 0.1µF 124k 10µF 200mA
OUTPUT 5V/DIV
1N4148
23V, Triple Output TFT-LCD Bias Supply with Soft-Start
0.1µF 4.7µH LT1930 SHDN 68nF X7R, 6.3V C2-C4, X7R, X7R, X7R, BAT54S EQUIVALENT MBR0520 EQUIVALENT PANASONIC ELT5KT4R7M 0.1µF 113k 10µF 0.1µF 220mA 0.1µF 10mA
3.3V 2.2µF 3.3V
1N4148
10mA
Start-Up Waveforms
OUTPUT 5V/DIV OUTPUT 10V/DIV
0.5A/DIV 2ms/DIV
10mA
1930/A TA11a
Start-Up Waveforms
OUTPUT 5V/DIV
OUTPUT 5V/DIV
OUTPUT 10V/DIV
0.5A/DIV 2ms/DIV
10mA
1930/A TA12a
LT1930/LT1930A
PACKAGE DESCRIPTIO
SOT-23 (Original) 1.45 (.035 .057) (.00 .006) 1.30 (.035 .051) (.014 .021)
SOT-23 (ThinSOT) 1.00 (.039 MAX) (.0004 .004) (.031 .035) (.012 .019 REF) (.037) (.010 .020) (5PLCS, NOTE 2.60 3.00 (.102 .118) 1.50 1.75 (.059 .069) (NOTE
(.008) DATUM
NOTE: CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS DIMENSIONS (INCHES)
DRAWING SCALE DIMENSIONS INCLUSIVE PLATING DIMENSIONS EXCLUSIVE MOLD FLASH METAL BURR MOLD FLASH SHALL EXCEED .254mm PACKAGE EIAJ REFERENCE SC-74A (EIAJ) ORIGINAL JEDEL MO-193 THIN
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.
Package 5-Lead Plastic SOT-23
(Reference 05-08-1633) (Reference 05-08-1635)
2.80 3.10 (.110 .118) (NOTE (.004 .008) (NOTE 1.90 (.074)
SOT-23 0401
LT1930/LT1930A
TYPICAL APPLICATIO
3.3V Transient Response
VOUT 50mV/DIV COUPLED 0.5A/DIV COUPLED LOAD 300mA CURRENT 200mA 20µs/DIV
1930
EFFICIENCY
RELATED PARTS
PART NUMBER LT1307 LT1316 LT1317 LT1610 LT1611 LT1613 LT1615 LT1617 LT1931/LT1931A DESCRIPTION Single Cell Micropower 600kHz DC/DC Converter Burst Mode Operation DC/DC Converter with Programmable Current Limit 2-Cell Micropower DC/DC Converter with Low-Battery Detector Single Cell Micropower DC/DC Converter Inverting 1.4MHz Switching Regulator 5-Lead ThinSOT 1.4MHz Switching Regulator 5-Lead ThinSOT Micropower Constant Off-Time DC/DC Converter 5-Lead ThinSOT Micropower Inverting DC/DC Converter 5-Lead ThinSOT Inverting 1.2MHz/2.2MHz Switching Regulator 5-Lead ThinSOT
Burst Mode trademark Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900
FAX: (408) 434-0507 www.linear.com
3.3V 450mA Step-Up Converter
3.3V 2.2µF SHDN 2.2µH LT1930A SHDN TAIYO-YUDEN LMK212BJ225MG TAIYO-YUDEN JMK316B106ML SEMICONDUCTOR MBR0520 MURATA LQH3C2R2M24 30.1k 10µF VOUT 450mA
1930/A TA09a
Efficiency
LOAD CURRENT (mA) 3.3V VOUT
1930/A TA09b
COMMENTS 3.3V 75mA from Single Cell, MSOP Package 1.5V Minimum, Precise Control Peak Current Limit 3.3V 200mA from Cells, 600kHz Fixed Frequency 30mA from 1.7MHz Fixed Frequency 150mA from Input, ThinSOT Package 200mA from 3.3V Input, ThinSOT Package 12mA from 2.5V, ThinSOT Package -15V 12mA from 2.5V Input, ThinSOT Package 350mA from input, ThinSOT Package
1930af LT/TP 0801 PRINTED
LINEAR TECHNOLOGY CORPORATION 2001
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