LTC3838-1_15 Datasheet, PDF (52/52 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

LTC3838-1
TYPICAL APPLICATION
7V to 14V Input, 5V/7A and 3.3V/7A Dual Output, 2MHz, R_SENSE, Step-Down Converter with EXTV_CC Tied to 5V Output
V_IN
7V TO 14V _{+ CIN1}
39µF
C_IN2
10µF
×3
V_OUT1
5V
7A
R_S1
0.008Ω
L1
0.8µH
C_OUT1
47µF
×2
2.2Ω
10Ω
10Ω
MT1
MB1
1µF
1nF
0.1µF
LTC3838-1
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
DB1
2.2Ω
1µF
BOOST1
TG1
SW1
4.7µF
DRV_CC1
INTV_CC
BG1
BOOST2
TG2
SW2
DRV_CC2
EXTV_CC
BG2
10Ω
1nF _10Ω
0.1µF
MT2
DB2
V_OUT1
MB2
L2
0.8µH
R_S2
0.008Ω
V_OUT2
3.3V
7A
C_OUT2
47µF
×2
73.2k
C_FF1
47pF
100k
PGND
V_OUTSENSE1+
10k
V_{OUTSENSE1–}
PGOOD1 _PGOOD1
0.01µF
V_DFB2+
10k
V_DFB2–
PGOOD2 ^PGOOD2
0.01µF
45.3k
10k//45.3k
SGND
100k
CFF2
150pF
22pF
330pF
24.9k
TRACK/SS1 TRACK/SS2
ITH1
ITH2
22pF
330pF
35.7k
18.7k
DTR1
V_RNG
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
38381 TA02
C_IN1: SANYO 16SVP39M
C_IN2: MURATA GRM32DR61E106K
C_OUT1, C_OUT2: TAIYO YUDEN LMK325BJ476MM-T
DB1, DB2: CENTRAL CMDSH-3
L1, L2: COILCRAFT XAL5030-801MEB
MT1, MB1, MT2, MB2: VISHAY Si7114ADN
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3833
Fast Controlled On-Time, High Frequency Synchronous
Step-Down Controller with Diff Amp
200kHz to 2MHz Operating Frequency, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 5.5V, 3mm × 4mm QFN-20, TSSOP-20
LTC3838/LTC3838-2 Dual or Single Output, Controlled On-Time, Synchronous Step- 200kHz to 2MHz Operating Frequency, 4.5V ≤ V_IN ≤ 38V,
Down Controller with Diff Amp(s), Internal/External Reference 0.6V/0.4V ≤ V_OUT ≤ 5.5V, 5mm × 7mm QFN-38, TSSOP-38
LTC3839
Single Output, 2-Channel Fast Controlled On-Time
Synchronous Step-Down Controller with Diff Amp
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
200kHz to 2MHz Operating Frequency, 4.5V ≤ V_IN ≤ 38V,
0.6V ≤ V_OUT ≤ 5.5V, 5mm × 5mm QFN-32
I²C/PMBus Interface with EEPROM and 16-Bit ADC,
V_IN Up to 24V, 0.5V ≤ V_OUT ≤ 5.5V, Analog Control Loop
LTC3869/LTC3869-2 Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller, with Accurate Current Sharing
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 38V,
V_OUT3 Up to 12.5V
LTC3855
Dual Output, 2-phase, Synchronous Step-Down DC/DC
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
Controller with Diff Amp and DCR Temperature Compensation 0.8V ≤ V_OUT ≤ 12V
LTC3856
Single Output 2-Channel Synchronous Step-Down DC/DC
Controller with Diff Amp and Up to 12-Phase Operation
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5V
LTC3861/LTC3861-1 Dual, Multiphase, Synchronous Step-Down DC/DC Controller Operates with Power Blocks, DRMOS Devices or External Drivers/
with Diff Amp and Three-State Output Drive
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
LTC3850/LTC3850-1 Dual Output, 2-Phase Synchronous Step-Down DC/DC
LTC3850-2
Controller, R_SENSE or DCR Current Sensing
PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V_IN ≤ 30V,
0.8V ≤ V_OUT ≤ 5.25V
38381f
52 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_F3_o5_r-_m7_o4_r1_e7_{information www.linear.com/3838-1}
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LT 0213 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2013