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LT8551 Datasheet(PDF) 28 Page - Analog Devices

Part # LT8551
Description  Multiphase Boost Converter Expander
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8551 Datasheet(HTML) 28 Page - Analog Devices

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LT8551
28
Rev 0
For more information www.analog.com
TYPICAL APPLICATIONS
48V/12.5A Step-Up Expander System
Load Step from 0A to 12.5A, VIN = 16V, TDPN = 5
VIN
REG
VIN
INTVCC
POWER STAGE 1
REG
GND
MODE
8551 TA02a
ISP
ISN
10
1nF
COUT8,
COUT9
68µF
63V
+
COUT2
4.7µF
x5
+ C
IN7
150µF
100V
CIN2
4.7µF
x3
10
464k 7.87k
1nF
100pF
10µF
10
0.22µF
1nF
+
CIN1
4.7µF
×3
CIN6
150µF
100V
0.22µF
1nF
10nF
COUT6,
COUT7
68µF
63V
+
COUT1
4.7µF
×5
POWER STAGE 2
POWER STAGE 3
POWER STAGE 4
ENOUT
CLK1
TGSR TGSH
BGSH
TGSL
SHDN
VIN
REGIS
REGDRV
REG
PHS1
PHS2
VCC
PHS3
SYNC
ILIM
RT/MS
IAMPP
IAMPN
CLK2
TGBUF
BGBUF
ITH
ILIM
SS
RUN
PLLIN/MODE
PGOOD
47k
10
10nF
10
47k
30.1k
1nF
47pF
4.7µF
L2
10µH
RS2
3m
L1
10µH
RS1
3m
15k
15nF
100pF
0.1µF
1µF
100V
1µF
100V
39k
LT8551
LTC3769
PINS FOR
POWER
STAGES 2,3,4
13k
160k
2.2µF
1nF
1
*WHEN VIN < 13V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED.
WHEN VIN > VOUT, THE CURRENT SHARING RELIES ON THE
MATCHING OF THE RDS(ON) OF THE N-CHANNEL MOSFETS.
VIN
VIN
5V TO 55V
MP
VOUT
48V/12.5A*
VOUT FOLLOWS VIN
WHEN VIN > 48V
REGSNS
INTVCC
INTVCC
OVMODE
20
12.1k
D2
D1
M1, M2
M3, M4
M5,
M6
M7,
M8
BST1
SW1
ISN1
ISP1
BG1
TG1
VIN
D1, D2, ... : BAT46WJ
MP: ZXMP10A18G
RS1–RS5: PANASONIC ERJMB1SF3M0U
L1–L5: COILCRAFT SER2918H-103KL
CIN1–CIN5: TDK C3225X7S2A475M
COUT1–COUT5: TDK C3225X7S2A475M
COUT6–COUT15: PANASONIC EEHZC1J680P
M1, M2, M3, M4, M5, M6, M7, M8, ... : BSC100N06LS3
SENSE–
SENSE+
EXTVCC
BOOST
TG
SW
BG
VFB
VBIAS
FREQ
GND
400µs/DIV
8551 TA02b
IL0
10A/DIV
IL1
10A/DIV
IL2
10A/DIV
VOUT
AC COUPLED
500mV/DIV



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