LTC3785_15 Datasheet, PDF (20/20 Pages) Linear Technology – 10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

LTC3785
Typical Application
Li-Ion/9V Wall Adapter to 5V/2A
1nF
66.5k ^205k
V_IN
RUN/SS
V_SENSE
V_CC
I_SVIN
TG1
270pF
V_BST1
205k
1.3k
66.5k
1nF
12k
59k
SW1
I_SSW1
V_DRV
FB
BG1
LTC3785
V_C
RT
I_SVOUT
TG2
42.2k
MODE
V_BST2
I_LSET
SW2
I_SSW2
CCM
BG2
GND
V_IN
2.7V TO 10V
C_VCC
4.7µF
9V REGULATED
WALL ADAPTER
+ _Li-Ion
2.7V TO 4.2V
CMDSH-3
C_A
0.22µF
MA
C_IN
22µF
MA = MB = MC = MD = 1/2 Si7940DY
L1 = RLF7030T-3R3M4R1
D1 = D2 = PMEG2020EJ
OPTIONAL
L1
MB
D1
3.3µH
CMDSH-3
C_B
0.22µF
OPTIONAL
MD
D2
V_OUT
5V
2A
C_OUT
100µF
MC
3785 TA03
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PART NUMBER DESCRIPTION
COMMENTS
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High Efficiency Buck-Boost DC/DC µModule
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4.5V ≤ V_IN ≤ 20V, 0.8V ≤ V_OUT ≤ 16V, 15mm × 15mm × 2.8mm
LTM4607
High Efficiency Buck-Boost DC/DC µModule
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4.5V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ 25V, 15mm × 15mm × 2.8mm
LTM4609
High Efficiency Buck-Boost DC/DC µModule
Complete Power Supply
4.5V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ 34V, 15mm × 15mm × 2.8mm
LTC3533
2A Synchronous Buck-Boost Monolithic DC/DC 1.8V ≤ V_IN ≤ 5.5V, 1.8V ≤ V_OUT ≤ 5.25V, I_Q = 40µA, I_SD < 1µA, 3mm × 4mm DFN-14
Converter
LTC3441
1.2A Synchronous Buck-Boost Monolithic DC/DC 2.4V ≤ V_IN ≤ 5.5V, 2.4V ≤ V_OUT ≤ 5.25V, I_Q = 25µA, I_SD < 1µA, 3mm × 4mm DFN-12
Converter
LTC3440
600mA Synchronous Buck-Boost Monolithic
DC/DC Converter
2.5V ≤ V_IN ≤ 5.5V, 2.5V ≤ V_OUT ≤ 5.5V, I_Q = 25µA, I_SD < 1µA, 3mm × 3mm DFN-10,
MSOP-10
LTC3444
500mA Synchronous Buck-Boost Monolithic
DC/DC Converter
2.7V ≤ V_IN ≤ 5.5V, ≤ 0.5V V_OUT ≤ 5.25V, Optimized for WCDMA RF Amplifier Bias,
3mm × 3mm DFN-8
LTC3532
500mA Synchronous Buck-Boost Monolithic
DC/DC Converter
2.4V ≤ V_IN ≤ 5.5V, 2.4V ≤ V_OUT ≤ 5.25V, I_Q = 35µA, I_SD < 1µA, 3mm × 3mm DFN-10,
MSOP-10
LTC3531
LTC3531-3
LTC3531-3.3
200mA Synchronous Buck-Boost Monolithic
DC/DC Converter
1.8V ≤ V_IN ≤ to 5.5V, 2V ≤ V_OUT ≤ 5V, I_Q = 35µA, I_SD < 1µA, 3mm × 3mm DFN-8,
ThinSOT-23
µModule is a registered trademark of Linear Technology Corporation.
3785fc
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0310 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2007