Datasheet

ADP1870/ADP1871 Data Sheet
Rev. B | Page 18 of 44
ADP1870/ADP1871 BLOCK DIAGRAM
DRVH
GND
I
REV
COMP
ADP1870/ADP1871
C
R (TRIMMED)
VREG
t
ON
TIMER
t
ON
= 2RC(V
OUT
/V
IN
)
I
SW
INFORMATION
SW FILTER
STATE
MACHINE
TON
BG_REF
PSM
IN_SS
PWM
DRVH
DH_LO
SW
DRVL
DL_LO
I
REV
LEVEL
SHIFT
HS
VREG
LS
VREG
300kΩ
8kΩ
800kΩ
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
I
SS
C
SS
0.4V
ADC
RES DETECT AND
GAIN SET
CS GAIN SET
BIAS BLOCK
AND REFERENCE
REF
LDO
PRECISION
ENABLE BLOCK
TO ENABLE
ALL BLOCKS
08730-063
Figure 65. ADP1870/ADP1871 Block Diagram