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| LTC3785 Datasheet, PDF (20/20 Pages) Linear Technology – 10V, High Effi ciency, Synchronous, No RSENSE Buck-Boost Controller | |||
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LTC3785
TYPICAL APPLICATIO
Li-Ion/9V Wall Adapter to 5V/2A
1nF
124k 205k
VIN
RUN/SS
VSENSE
VCC
ISVIN
TG1
270pF
VBST1
205k
1.3k
1nF
66.5k 12k
59k
SW1
ISSW1
VDRV
FB
BG1
LTC3785
VC
RT
ISVOUT
TG2
42.2k
MODE
VBST2
ILSET
SW2
ISSW2
CCM
BG2
GND
VIN
2.7V TO 10V
CVCC
4.7µF
9V REGULATED
WALL ADAPTER
+
Li-Ion
2.7V TO 4.2V
CMDSH-3
CA
0.22µF
MA
CIN
22µF
MA = MB = MC = MD = 1/2 Si7940DY
L1 = SUMIDA CE123-4R6
D1 = D2 = PMEG2020EJ
OPTIONAL
D1
L1
MB
4.7µH
CMDSH-3
CB
0.22µF
OPTIONAL
MD
D2
VOUT
5V
2A
COUT
100µF
MC
3785 TA03
RELATED PARTS
PART
NUMBER
DESCRIPTION
COMMENTS
LTC3440
600mA IOUT, 2MHz, Synchronous Buck-Boost DC/DC Converter VIN: 2.5V to 5.5V, VOUT: 2.5V to 5.5V, IQ = 25µA, ISD < 1µA,
MS, DFN Packages
LTC3441
1.2A IOUT, 1MHz, Synchronous Buck-Boost DC/DC Converter
VIN: 2.4V to 5.5V, VOUT: 2.4V to 5.25V, IQ = 25µA, ISD < 1µA,
DFN Package
LTC3442
1.2A IOUT, 2MHz, Synchronous Buck-Boost DC/DC Converter
VIN: 2.4V to 5.5V, VOUT: 2.4V to 5.25V, IQ = 35µA, ISD < 1µA,
DFN Package
LTC3443
1.2A IOUT, 600kHz, Synchronous Buck-Boost DC/DC Converter
VIN: 2.4V to 5.5V, VOUT: 2.4V to 5.25V, IQ = 28µA, ISD < 1µA,
MS Package
LTC3444
500mA IOUT, 1.5MHz Synchronous Buck-Boost DC/DC Converter VIN: 2.7V to 5.5V, VOUT: 0.5V to 5.25V, Optimized for WCDMA RF
Ampliï¬er Bias
LTC3531
LTC3531-3
200mA IOUT, Synchronous Buck-Boost DC/DC Converter
LTC3531-3.3
VIN: 1.8V to 5.5V, VOUT: 2V to 5V, IQ = 35µA, ISD < 1µA,
MS, DFN Packages
LTC3532
500mA IOUT, 2MHz, Synchronous Buck-Boost DC/DC Converter VIN: 2.4V to 5.5V, VOUT: 2.4V to 5.25V, IQ = 35µA, ISD < 1µA,
MS, DFN Packages
LTC3533
2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter VIN: 1.8V to 5.5V, VOUT: 1.8V to 5.25V, IQ = 40µA, ISD < 1µA,
DFN Package
LTC3780
High Efï¬ciency, Synchronous, 4-Switch Buck-Boost Controller
VIN: 4V to 36V, VOUT: 0.8V to 30V, IQ = 1.5mA, ISD < 55µA,
SSOP-24, QFN-32 Packages
3785f
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 â FAX: (408) 434-0507 â www.linear.com
LT 0907 ⢠PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007
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