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MAX16821 Datasheet(PDF) 21 Page - Maxim Integrated Products

Part # MAX16821
Description  High-Power Synchronous HBLED Drivers with Rapid Current Pulsing
PDF  24 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX16821 Datasheet(HTML) 21 Page - Maxim Integrated Products

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Power Dissipation
Calculate power dissipation in the MAX16821A–
MAX16821C as a product of the input voltage and the
total VCC regulator output current (ICC). ICC includes
quiescent current (IQ) and gate-drive current (IDD):
PD = VIN x ICC
ICC = IQ + [fSW x (QG1 + QG2)]
where QG1 and QG2 are the total gate charge of the low-
side and high-side external MOSFETs at VGATE = 5V, IQ
is the supply current, and fSW is the switching frequency
of the LED driver.
Use the following equation to calculate the maximum
power dissipation (PDMAX) in the chip at a given ambient
temperature (TA):
PDMAX = 34.5 x (150 – TA) mW
Figure 11. Boost LED Driver with PWM Dimming
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28
VLED
LED
STRING
VIN
C11
C10
C9
C8
R7
R9
R3
R4
VCC
ON/OFF
R6
R5
PGND
N.C.
N.C.
DL
BST
LX
DH
I.C.
OUTV RT/SYNC
EN
MODE CLKOUT SGND
SGND SENSE- SENSE+ SGND
IN
VCC
VDD
OVI
CLP
EAOUT
EAN
DIFF
CSN
CSP
Q5
Q4
MAX16821A
MAX16821B
MAX16821C
VLED
C3
C7
C6
C5
R2
R1
R8
PWM DIM
Q2
VCC
R10
PWM DIM
Q3
PWM DIM
Q1
L1
D1
VIN
7V TO 28V
C2
C1
MAX16821A/MAX16821B/
MAX16821C
High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
www.maximintegrated.com
Maxim Integrated │ 21



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