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ADP1871 Datasheet(PDF) 18 Page - Analog Devices

Part # ADP1871
Description  Synchronous Buck Controller with Constant On-Time and Valley Current Mode
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP1871 Datasheet(HTML) 18 Page - Analog Devices

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ADP1870/ADP1871
Rev. 0 | Page 18 of 44
ADP1870/ADP1871 BLOCK DIAGRAM
DRVH
GND
IREV
COMP
ADP1870/ADP1871
C
R (TRIMMED)
VREG
tON TIMER
tON = 2RC(VOUT/VIN)
I
SW
INFORMATION
SW FILTER
STATE
MACHINE
TON
BG_REF
BG_REF
BG_REF
INL_HICC
BG_REF
HI
SW
LO
BG_REF
LEVEL
SHIFT
HS
VREG
LS
VREG
300k
Ω
8k
Ω
SW
DRVL
PGND
BST
VIN
PSM
REF_ZERO
SS
COMP
ERROR
AMP
SS_REF
0.6V
LOWER
COMP
CLAMP
REF_ZERO
CS
AMP
PWM
FB
COMP/
EN
VREG
ISS
CSS
0.4V
ADC
RES DETECT AND
GAIN SET
CS GAIN SET
BIAS BLOCK
AND REFERENCE
REF
LDO
PRECISION
ENABLE BLOCK
TO ENABLE
ALL BLOCKS
Figure 65. ADP1870/ADP1871 Block Diagram


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