LTC3802_15 Datasheet, PDF (28/28 Pages) Linear Technology – Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

LTC3802
TYPICAL APPLICATIO
2.5V/15A and 1.8V/15A Outputs with Start-Up Tracking and External Synchronization
V_OUT1
2.5V
15A
GND
V_IN
8V TO 28V _{+ CIN}
22µF
35V
×4
1.5µF
35V
×8
2k
100Ω
5.6V
Q1
ZETEX
FZT603
MM5Z6V2ST1
+
10µF
L1
1µH
560pF
D1
B340B
R11
10k
R_T4 R41
10k 10k
+ C_OUT1
330µF
4V ×3
R_B1
3.16k
R_T5
4.99k
R31
C31 390Ω
1500pF
R51
3.16k
C_OUT1, C_OUT2: SANYO 4TPD330M
L1, L2: TOKO FDA1254-1R0M
QT1
Si7884DP
0.1µF
QB1
Si7884DP
×2
R_IMAX1
62k
R21
15k ^C11
2200pF
C21
330pF
BURST
CONTINUOUS
1
4
PV_CC
TG1
3 _BOOST1
5 _SW1
2 _BG1
6 _PGND
TG2 ²⁶
BOOST2 ²⁷
25
SW2
28
BG2
PLLIN ²⁴
PLLLPF ²³
LTC3802
7
8
I_MAX1
FBT
I_MAX2
CMPIN2
22
21
9 _CMPIN1
10
COMP1
11 _FB1
12 _SGND
13 _FCB
14 _RUN/SS
V_CC ²⁰
19
COMP2
18
FB2
PHASEMD ¹⁷
16
V_INFF
PGOOD
15
C_SS
0.1µF
10k
V_CC
V_IN
C_INFF
0.47µF
V_CC
D3
BAS40-06LT1
0.1µF
10k _{0.1µF 2k}
10k
0 DEG
QT2
Si7884DP L2
1µH
EXT
SYNC
QB2
Si7884DP
×2
R_IMAX2
D2
62k B340B
C_OUT2 +
330µF
4V ×3
0.1µF
10Ω
+
V_CC
10µF
R52
4.99k
C22
R22
330pF C12
2200pF
15k
R42
10k
560pF
R_B2
4.99k
V_OUT2
1.8V
C32 15A
1500pF
R12
10k
R32
390Ω
GND
3802 TA02
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PolyPhase is a registered trademark of Linear Technology Corporation. No R_SENSE is a trademark of Linear Technology Corporation.
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
3802f
LT/TP 0404 1K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004