LTC3642 Datasheet, PDF (20/20 Pages) Linear Technology – High Effi ciency, High Voltage 50mA Synchronous Step-Down Converter

LTC3642
TYPICAL APPLICATION
5V, 50mA Regulator for Automotive Applications
V_BATT
12V
L1
220μH
V_IN
SW
C_IN
1μF
LTC3642
R1
470k
C_OUT
10μF
V_OUT
5V
50mA
RUN
V_FB
I_SET
R2
88.7k
SS
HYST
GND
3642 TA06a
C_IN: TDK C3225X7R2A105M
C_OUT: KEMET C1210C106K4RAC
L1: COILTRONICS DRA73-221-R
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PART NUMBER DESCRIPTION
COMMENTS
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LT1976/LT1977 60V, 1.2A (I_OUT), 200kHz/500kHz, High Efficiency Step-Down DC/DC V_IN: 3.3V to 60V, V_OUT(MIN) = 1.2V, I_Q = 100μA, I_SD < 1μA,
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LT3434/LT3435
LT3437
60V, 2.4A (I_OUT), 200kHz/500kHz, High Efficiency Step-Down DC/DC V_IN: 3.3V to 60V, V_OUT(MIN) = 1.2V, I_Q = 100μA, I_SD < 1μA,
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60V, 400mA (I_OUT), Micropower Step-Down DC/DC Converter with V_IN: 3.3V to 60V, V_OUT(MIN) = 1.25V, I_Q = 100μA, I_SD < 1μA,
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LT3470
40V, 250mA (I_OUT), High Efficiency Step-Down DC/DC Converter
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LT3480
36V with Transient Protection to 60V, 2A (I_OUT), 2.4MHz, High
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LT3481
LT3493
LT3500
34V with Transient Protection to 36V, 2A (I_OUT), 2.8MHz, High
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36V, 1.4A (I_OUT), 750kHz High Efficiency Step-Down DC/DC
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LT3506/LT3506A
LT3508
LT3684
25V, Dual 1.6A (I_OUT), 575kHz/1.1MHz High Efficiency Step-Down
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36V with Transient Protection to 40V, Dual 1.4A (I_OUT), 3MHz, High
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34V with Transient Protection to 36V, 2A (I_OUT), 2.8MHz, High
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V_IN: 3.7V to 37V, V_OUT(MIN) = 0.8V, I_Q = 4.6mA, I_SD = 1μA,
4mm × 4mm QFN24, TSSOP16E
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LT3685
36V with Transient Protection to 60V, 2A (I_OUT), 2.4MHz, High
Efficiency Step-Down DC/DC Converter
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ThinSOT is a trademark of Linear Technology Corporation.
3642f
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 1108 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2008