LTC3876_15 Datasheet, PDF (48/48 Pages) Linear Technology – Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and 50mA VTT Reference

LTC3876
TYPICAL APPLICATION
4.5V to 5.5V Input, VDDQ 1.5V/20A and VTT 0.75V/±10A Output, 1.2MHz, R_SENSE, Step-Down Converter
V_IN
4.5V TO 5.5V
VDDQ
1.5V
20A
C_OUT1
100μF
C_IN1
180μF
C_IN2
10μF
w3
R31
0.002Ω
L1
0.18μH
C_OUT2
330μF
w2
2.2Ω
1μF
100Ω
100Ω
1nF
649Ω
0.1μF
LTC3876
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
MT1
TG1
TG2
DB1
2.2Ω
1μF
SW1
DRV_CC1
INTV_CC
4.7μF
SW2
DRV_CC2
EXTV_CC
MB1
BG1
BG2
PGND
30.1k
100k
VDDQSNS
V_OUTSENSE1+
20k
V_{OUTSENSE1–}
PGOOD _PGOOD
0.01μF
VTTRVCC
VTTSNS
VTTR
TRACK/SS1
39pF
ITH1
ITH2
150pF
68.1k
100Ω
1nF100Ω
0.1μF
DB2
V_IN
1Ω
1μF
2.2μF
120pF
270pF
33.2k
32.4k
DTR1
V_RNG1
RT
SGND
RUN
CVCC
V_RNG2
PHASMD
MODE/PLLIN
CLKOUT
3876 TA02
MT2
L2
R32
0.22μH 0.003Ω
MB2
C_OUT4
330μF
VTT
0.75A
±10A
C_OUT3
100μF
VTTR
±50mA
C_IN1: SANYO 16SVP180M
C_IN2: MURATA GRM32DR61E106KA12L
C_OUT2, C_OUT4: SANYO 2R5TPE330M9
C_OUT1, C_OUT3: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL SEMI CMDSH-3
L1: TOKO FCUL1040-H-R18M
L2: TOKO FDUE0640-R22M
MT1, MB1, MB2:INFINEON BSC0901NS
MT2: INFINEON BSC050NE2LS
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LTC3776
Dual, 2-Phase, No R_SENSE™, Synchronous Controller for 2.75V ≤ V_IN ≤ 9.8V, V_OUT Tracks One-Half V_REF, 4mm × 4mm QFN-24, SSOP-24
DDR/QDR Memory Termination
LTC3717
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High Power DDR Memory Termination Regulator
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Fast Controller On-Time, High Frequency Synchronous
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4V ≤ V_IN ≤ 36V, V_OUT Tracks One-Half V_IN or V_REF
1.5V ≤ V_IN, Supplies 5V Gate Drive for N-Channel MOSFETs
V_OUT Tracks One-Half V_IN or V_REF, 3V ≤ V_IN ≤ 8V
2.25V ≤ V_IN ≤ 5.5V, TSSOP-16E
Up to 2MHz Operating Frequency 4.5V < V_IN < 38V, 0.6V < V_OUT < 5.5V,
3mm × 4mm QFN-20, TSSOP-20E
LTC3838
Dual, Fast, Accurate Step-Down DC/DC Controller with Up to 2MHz Operating Frequency 4.5V < V_IN < 38V, 0.6V < V_OUT < 5.5V,
Differential Output Sensing
5mm × 7mm QFN-38, TSSOP-38E
LTC3634
LTC3617
LTC3618
15V Dual 3A Monolithic DDR Memory Termination
6A Monolithic DDR Memory Termination
Dual 3A Monolithic DDR Memory Termination
3.6V ≤ V_IN ≤ 15V, 4mm × 5mm QFN-28, TSSOP-28E
2.25V ≤ V_IN ≤ 5.5V, 3mm × 5mm QFN-24
2.25V ≤ V_IN ≤ 5.5V, 4mm × 4mm QFN-24, TSSOP-24
48 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3876f
LT 1111 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011