LTC3773 Datasheet, PDF (32/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

LTC3773
TYPICAL APPLICATION
68.1k
POWER DOWN V_OUT1
POWER DOWN V_OUT2
POWER DOWN V_OUT3
10Ω 10Ω
1000pF
39 38 37 36 35 34 33 32
PGOOD
10k
V_CC
4.5V TO 6V
4.7μF
16V
0.01μF
15k
1nF 20k
150pF
1nF ^8.2k
1nF ^5.9k
150pF
150pF
10k
10k
0.01μF
0.01μF
20k
1 _TRACK1
2 _VFB1
3 _ITH1
4 _SGND
5 _ITH2
6 _ITH3
7 _VFB2
8 _VFB3
9 _TRACK2
10 _TRACK3
11 _SENSE2–
12 _SENSE2+
LTC3773
CMDSH-3
BOOST1 ³¹
1
TG1 ³⁰
0.1μF
5
SW1 ²⁹
4
SW2 ²⁸
TG2 ²⁷
0.1μF
BOOST2 ²⁶
CMDSH-3
BOOST3 ²⁵
CMDSH-3
TG3 ²⁴
0.1μF
1
SW3 ²³
5
BG1 ²²
4
BG2 ²¹
V_DR ²⁰
31.6k
L1:
TDK RLF7030T-2R2M5R4
L2, L3:
TDK RLF7030T-1R5M5R4
C_OUT1 C_OUT2 C_OUT3,:
SANYO POSCAP 4TPE220MF
1000pF
10Ω
10Ω
13 14 15 16 17 18 19
1000pF
2.2μF
10Ω
0.1μF
10Ω
10Ω
4.7μF
1
5
4
V_IN
4.5V TO 14V
47μF
16V
8 Si4816BDY
L1
6, 7 ^2.2μH
2, 3
7mΩ
C_OUT1
220μF
4V
V_OUT1
3.3V/5A
22μF
X5R
8 Si4816BDY
6, 7
V_IN
4.7μF
16V
L2
1.5μH
7mΩ
C_OUT2
220μF
4V
2, 3
8 Si4816BDY
6, 7
V_IN
4.7μF
16V
L3
1.5μH 7mΩ
2, 3
C_OUT3
220μF
4V
V_OUT2
2.5V/5A
22μF
X5R
V_OUT3
1.8V/5A
22μF
X5R
Figure 12. High Efficiency, Small Footprint Triple Output Step-Down Converter
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3407-2
Dual Synchronous, 800mA, 2.25MHz Step-Down Monolithic
DC/DC Regulator
V_IN: 2.5V to 5.5V, V_OUT: 0.6V to 5V, 100% Maximum Duty Cycle
LTC3417A
LTC3703
LTC3708
Dual Synchronous Step-Down Monolithic 1.5A/1A
High Input Synchronous Step-Down Controller
No R_SENSE^TM, Dual, 2-Phase Synchronous Step-Down Controller
with Output Tracking
V_IN: 2.25V to 5.5V, V_OUT: 0.8V to 5V, 100% Maximum Duty Cycle
V_IN ≤ 100V
Very Low Duty Factor Operation, Programmable Output Voltage
Voltage Up/Down Tracking
LTC3727
Dual Output 2-Phase Current Mode Synchronous DC/DC Step- V_IN: 4V to 36V, V_OUT: 0.8V to 14V, 99% Maximum Duty Cycle,
Down Switching Regulator Controller
Selectable Burst Mode Operation
LTC3728
Dual PolyPhase^® Synchronous Step-Down Switching Regulator Dual Output, Current Mode
LTC3729
20A to 200A, 500kHz PolyPhase Synchronous Controller
Expandable from 2-Phase, Uses All Surface Mount Components,
V_IN up to 36V
LTC3731
3- to 12-Phase Step-Down Synchronous Controller
Single Output, 60A to 240A Output Current, 0.6V ≤ V_OUT ≤ 6V,
4.5V ≤ V_IN ≤ 32V
LTC3778
Wide Operating Range, No R_SENSE Step-Down Controller
Single Channel, Separate V_ON Programming
LTC3802
Dual PolyPhase Voltage Mode Synchronous Step-Down
Switching Regulator with Output Tracking
Very Low Duty Factor Operation, Programmable Output Voltage
Up/Down Tracking, V_IN Up to 30V
LTC3827
Low I_Q, Dual, 2-Phase Synchronous Step-Down Controller
Low 80μA I_Q, 0.8V ≤ V_OUT ≤ 10V, 4V ≤ V_IN ≤ 36V
No R_SENSE is a trademark of Linear Technology Corporation. PolyPhase is a registered trademark of Linear Technology Corporation.
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3773fb
LT 0907 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2006