LTC3774
38
3774fc
For more information www.linear.com/LTC3774
LINEAR TECHNOLOGY CORPORATION 2013
LT 0417 REV C • PRINTED IN USA
www.linear.com/LTC3774
TYPICAL APPLICATION
RELATED PARTS
Dual Phase 1.2V/30A LTC3774 Converter with Hot Swap Circuits On the Input of Each Phase
RUN1, 2
V
IN
INTV
CC
FREQ
PHSMD
TK/SS1,2
I
TEMP1,2
V
OSNS1,2
+
V
OSNS1,2
–
I
TH1,2
I
LIM1,2
ON1
CLS
GND
ON2
FTMR1
FAULT1
FAULT2
FTMR2
SNSD1
+
SNS1
–
SNSA1
+
PGOOD1
PGOOD2
SNSA2
+
SNS2
–
SNSD2
+
CLKOUT
MODE/PLLIN
LTC3774
LTC4226
64.9k
10k
0.007Ω FDMS86500DC
D17
CMHZ4690
0.007Ω
FDMS86500DC
PWM2HIZB2 PWMEN2
PWM1HIZB1
HIZB1
HIZB2
1µF
PWMEN1
GND
4.7µF
10k
0.1µF
37.4k
330pF
L1, L2: WÜRTH 744301033
COUTCER1,2: MURATA GRM31CR60J107ME39L
COUTBLK: SANYO 2R5TPE330M9
3.01k
2.2k
3.3nF
10k
V
CC2
SENSE2
GATE2
OUT2
V
CC1
SENSE1
GATE1
OUT1
10k 10k
100pF
22µF
25V
V
IN
10V TO 14V
150µF
25V
2×
5V
BIAS
V
IN1
V
IN2
30.1k
100pF
2.4M CMHZ4690
1N4448HWT
1N4448HWT
PWM
V
IN
BOOT
PHASE
V
SWH
FDMF6820
DrMOS
5V BIAS
1Ω
CGND
PGND
V
CIN
V
DRV
0.22µF
L4
0.33µH
2.2µF
22µF
25V
2×
2.2µF
0.22µF
0.22µF
0.22µF
0.22µF
931Ω
4.64k
931Ω
4.64k
PWM
V
IN
BOOT
PHASE
V
SWH
FDMF6820
DrMOS
5V BIAS
1Ω
CGND
PGND
V
CIN
V
DRV
0.22µF
2.2µF
22µF
25V
2×
2.2µF
C
OUTCER1
100µF
6.3V
2×
C
OUTCER1
330µF
2.5V
6×
V
OUT
1.2V/30A
L3
0.33µH
C
OUTCER2
100µF
6.3V
2×
1N4448HWT
1N4448HWT
1µF
10k
V
IN1
V
IN2
37.4k
PART NUMBER DESCRIPTION COMMENTS
LTM4630
LTM4630-1A
LTM4630-1B
Dual 18A or Single 36A DC/DC μModule Regulator 4.5V ≤ V
IN
≤ 15V, 0.6V ≤ V
OUT
≤ 1.8V
±1.5% Max V
OUT
Error Over Line,Load and Temp
–1A Version: ±0.8% Max V
OUT
Error Over Line, Load and Temp
LTC3887 Dual Output Multiphase Step-Down DC/DC Controller with
Digital Power System Management and ±0.5% Accuracy
4.5V≤ V
IN
≤ 24V, 0.5V ≤ V
OUT
≤ 5.5V, Analog Control Loop,
70ms Start-Up, I
2
C/PMBus Interface with EEPROM and 16-bit ADC
LTC3875 Dual, Multiphase Synchronous Controller with
Sub Milliohm DCR Sensing and Temperature Compensation
4.75V≤ V
IN
≤ 38V, 0.6V ≤ V
OUT
≤ 3.5V/5V
Excellent Current Share when Paralleled
LTC3861 Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Diff Amp and T
ri-State Output Drive
Operates with Power Blocks, DrMOS or
External MOSFET
s 3V≤ V
IN
≤ 24V
LTC3855 Dual Output, 2-phase, Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temperature Compensation
4.5V≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 12V
PLL Fixed Frequency 250kHz to 770kHz,
LTC3856 Single Output 2-Phase Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR T
emperature Compensation
4.5V≤ V
IN
≤ 38V, 0.8V≤ V
OUT
≤ 5V
PLL Fixed 250kHz to 770kHz Frequency
LTC3838 Dual Output, 2-phase, Synchronous Step-Down DC/DC
Controller with Diff Amp and Controlled On-T
ime
4.5V≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5.5V
PLL, Up to 2MHz Switching Frequency
LTC3869/
LTC3869-2
Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller, with Accurate Current Share
4V≤ V
IN
≤ 38V, V
OUT3
up to 12.5V
PLL Fixed 250kHz to 750kHz Frequency
LTC4449 High Speed Synchronous N-Channel MOSFET Driver V
IN
up to 38V, 4V ≤ V
CC
≤ 6.5V Adaptive
Shoot-Through Protection, 2mm x 3mm DFN-8
