LTC3425_15 Datasheet, PDF (24/24 Pages) Linear Technology – 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter

LTC3425
TYPICAL APPLICATIO
10MHz, High Current, Very Low Profile, 8-Phase Converter Using Two LTC3425s Operating
in Fixed Frequency Mode with Forced CCM (Max Component Height = 1.6mm)
V_IN
2.5V
C_IN1
2.2µF
L1
L2
L3
L4
1µH 1µH 1µH 1µH
V_IN SWA SWB SWC SWD
V_OUT
SHDN
REFOUT
CCM
REFEN
SYNCIN
BURST
LTC3425
V_OUTS
V_OUTA
V_OUTB
V_OUTC
V_OUTD
FB
COMP
C_OUT1
4.7µF
×4
R_T
SS
R_T1
I_LIM
12.1k
SYNCOUT
PGOOD
R5
SGND GNDA GNDB GNDC GNDD
75k
C_IN2
2.2µF
L5
L6
L7
L8
1µH 1µH 1µH 1µH
V_IN SWA SWB SWC SWD
V_OUT
SHDN
REFOUT
CCM
V_OUTS
V_OUTA
V_OUTB
V_OUTC
V_OUTD
R_F4
17.4k
REFEN
SYNCIN
BURST
LTC3425
FB
COMP
R_T
SS
I_LIM
SYNCOUT
PGOOD
R_F3
10.2k
R_T2 R6
14.7k 75k
SGND GNDA GNDB GNDC GNDD
C_OUT2
4.7µF
×4
C_SS
0.022µF
C1
330pF
R3
33k
R_F2
17.4k
R4
100k
V_OUT
3.3V
5A
R_F1
10.2k
PGOOD
C_IN1,2: TAIYO YUDEN JMK107BJ225MA
C_OUT: TAIYO YUDEN JMK212BJ475MG (×8)
L1 TO L8: MURATA LQH32CN1R0M51
3425 TA05
RELATED PARTS
PART NUMBER
LT^®1370/LT1370HV
LT1371/LT1371HV
LT1613
LT1618
LTC1700
LTC1871
LT1930/LT1930A
LT1946/LT1946A
LT1961
LTC3400/LTC3400B
LTC3401/LTC3402
LTC3701
DESCRIPTION
COMMENTS
6A (I_SW) 500kHz, High Efficiency Step-Up DC/DC
Converters
V_IN: 2.7V to 30V, V_OUT(MAX): 35V/42V, I_Q: 4.5mA, I_SD: <12µA,
DD, TO220-7
3A (I_SW) 500kHz, High Efficiency Step-Up DC/DC
Converters
V_IN: 2.7V to 30V, V_OUT(MAX): 35V/42V, I_Q: 4mA, I_SD: <12µA,
DD, TO220-7, S20
550mA (I_SW) 1.4MHz, High Efficiency Step-Up DC/DC
Converter
1.5A (I_SW) 1.25MHz, High Efficiency Step-Up DC/DC
Converter
No R_SENSE^TM 530kHz, Synchronous Step-Up
DC/DC Controller
90% Efficiency, V_IN: 0.9V to 10V, V_OUT(MAX): 34V, I_Q: 3mA,
I_SD: <1µA, ThinSOT
90% Efficiency, V_IN: 1.6V to 18V, V_OUT(MAX): 35V, I_Q: 1.8mA,
I_SD: <1µA, MS10
95% Efficiency, V_IN: 0.9V to 5V, I_Q: 200µA, I_SD: <10µA, MS10
Wide Input Range, 1MHz, No R_SENSE Current Mode Boost, 92% Efficiency, V_IN: 2.5V to 36V, I_Q: 250µA, I_SD: <10µA, MS10
Flyback and SEPIC Controller
1A (I_SW) 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC
Converters
1.5A (I_SW) 1.2MHz/2.7MHz, High Efficiency Step-Up
DC/DC Converters
1.5A (I_SW) 1.25MHz, High Efficiency Step-Up DC/DC
Converter
600mA (I_SW) 1.2MHz, Synchronous Step-Down DC/DC
Converters
1A/2A (I_SW) 3MHz, Synchronous Step-Up DC/DC
Converters
High Efficiency, V_IN: 2.6V to 16V, V_OUT(MAX): 34V, I_Q: 4.2mA/5.5mA,
I_SD: <1µA, ThinSOT
High Efficiency, V_IN: 2.45V to 16V, V_OUT(MAX): 34V, I_Q: 3.2mA,
I_SD: <1µA, MS8
90% Efficiency, V_IN: 3V to 25V, V_OUT(MAX): 35V, I_Q: 0.9mA,
I_SD: 6µA, MS8E
92% Efficiency, V_IN: 0.85V to 5V, V_OUT(MAX): 5V, I_Q: 19µA/300µA,
I_SD: <1µA, ThinSOT
97% Efficiency, V_IN: 0.5V to 5V, V_OUT(MAX): 6V, I_Q: 38µA, I_SD: <1µA,
MS10
2-Phase, 550kHz, Low Input Voltage, Dual Step-Down
DC/DC Controller
97% Efficiency, V_IN: 2.5V to 10V, I_Q: 460µA, I_SD: <9µA, SSOP-16
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
3425f
LT/TP 0803 1K PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2003