LTC3852
32
3852f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
” LINEAR TECHNOLOGY CORPORATION 2010
LT 1010 • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3736/LTC3736-1/
LTC3736-2
Dual, 2-Phase Synchronous Step-Down Controller 2.75V ≤ V
IN
≤ 9.8V, No R
SENSE
™
LTC3772/LTC3772B Micropower, No R
SENSE
Constant Frequency Step-Down
DC/DC Controller
2.75V ≤ V
IN
≤ 9.8V, No R
SENSE
, 40µA No-Load I
Q
LTC3776 Dual 2-Phase, No R
SENSE
Synchronous Controller for DDR/
QDR Memory Termination
2.75V ≤ V
IN
≤ 9.8V, V
OUT2
Tracks 1/2 V
REF
LT3808 No R
SENSE
, Low EMI, Synchronous DC/DC Controller with
Output Tracking
2.75V ≤ V
IN
≤ 9.8V, Spread Spectrum Modulation for Low Noise
LTC3809/LTC3809-1 No RSENSE, Low Input Voltage, Synchronous DC/DC
Controller
2.75V ≤ V
IN
≤ 9.8V, Output Tracking (LTC3809-1) or Spread
Spectrum Modulation
LTC3822/LTC3822-1 Low Input Voltage Synchronous Step-Down Controller 2.75V ≤ V
IN
≤ 4.5V, No R
SENSE
LTC3836 Dual, Low Input Voltage Synchronous Step-Down Controller 2.75V ≤ V
IN
≤ 4.5V, No R
SENSE
TYPICAL APPLICATIONS
Figure 18. 1.2V/20A Low Ripple DCR Sense Application
C8
1nF
1
2
3
JP1
RUN
R9
12.1k
C5
0.1µF
2.2µF
10V
0603
C1
R5
95.3k
1%
R16
100k
R17
100k
C9
100pF
C11
0.1µF
V
IN
INTV
CC
PGOOD
ON
OFF
+
V
IN
2.7V TO 5.5V
C
IN1
220µF
6.3V
s2
L1
0.36µH
C
IN5
10µF
16V
1206
C
OUT1
100µF
6.3V
s5
C
OUT3
470µF/4V
s2
V
OUT
1.2V/20A
Q1
D1
Q3
C15
4.7µF
10V
C6
0.1µF
C12
0.1µF
+
GND
R8
2.1k
R20
20k
1%
R19
40.2k
1%
GND1 GND2
FB
BG
BOOST
SW
TG
INTV
CC
V
IN2
V
IN1
V
PUMP
SENSE
–
SENSE
+
C
–
C
+
MODE/
PLLIN
FREQ/PLLFLTR
RUN
TRACK/SS
PGOOD
SHDN
I
TH
GND
LTC3852EUDD
3852 F17
C
IN1
: SANYO 6TPE220MI
C
OUT1
: AVX 12106D107MAT2A
C
OUT3
: SANYO 4TPF470ML
D1: CENTRAL SEMI CMDSH-3
L1: VISHAY IHLP4040DZ-01
Q1, Q3: VISHAY SILICONIX SiR438DP
