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MAX16821A Datasheet, PDF (9/25 Pages) Maxim Integrated Products – High-Power Synchronous HBLED Drivers with Rapid Current Pulsing
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High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
VCC
EN
0.5 x VCC
IN
+5V LDO
UVLO
POR
TEMP SEN
VCC
TO INTERNAL CIRCUIT
I.C.
CLP
CSP
AV = 34.5
CSN
VCM
OUTV
RT/SYNC
CLKOUT
DIFF
SENSE-
SENSE+
EAOUT
EAN
AV = 4
VCLAMP LOW
CLK
OSCILLATOR
RAMP
GENERATOR
VCM
DIFF
AMP
gm
VCLAMP HIGH
2 x fS
ERROR
AMP
0.12 x VREF
VREF = 0.6V
SOFT-
START
VCM
PWM
COMPARATOR
OVP
COMPARATOR
ENABLE
UVLO
S
Q
MUX
R
Q
VTH
MAX16821A
MAX16821B
MAX16821C
BST
DH
LX
VDD
DL
PGND
MODE
OVI
SGND
Figure 1. Internal Block Diagram
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