MAX16821B datasheet(2/24 Pages) MAXIM

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High-Power Synchronous HBLED

Drivers with Rapid Current Pulsing

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = 5V, VDD = VCC, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN to SGND.............................................................-0.3V to +30V

BST to SGND..........................................................-0.3V to +35V

BST to LX..................................................................-0.3V to +6V

DH to LX ...........................................-0.3V to (VBST - VLX) + 0.3V

DL to PGND................................................-0.3V to (VDD + 0.3V)

VCC to SGND............................................................-0.3V to +6V

VCC, VDD to PGND ...................................................-0.3V to +6V

SGND to PGND .....................................................-0.3V to +0.3V

VCC Current ......................................................................300mA

All Other Pins to SGND...............................-0.3V to (VCC + 0.3V)

Continuous Power Dissipation (TA = +70°C)

28-Pin TQFN 5mm x 5mm (derate 34.5mW/°C

above +70°C) ............................................................2758mW

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Internal LDO on

Input-Voltage Range

VIN

Internal LDO off (VCC connected to VIN)

4.75

5.50

Quiescent Supply Current

VEN = VCC or SGND, no switching

2.7

5.5

LED CURRENT REGULATOR

VIN = VCC = 4.75V to 5.5V, fSW = 500kHz

(MAX16821A)

0.594

0.600

0.606

VIN = 7V to 28V, fSW = 500kHz

(MAX16821A)

0.594

0.600

0.606

VIN = VCC = 4.75V to 5.5V, fSW = 500kHz

(MAX16821B)

0.098

0.100

0.102

VIN = 7V to 28V, fSW = 500kHz

(MAX16821B)

0.098

0.100

0.102

VIN = VCC = 4.75V to 5.5V, fSW = 500kHz

(MAX16821C)

0.028

0.030

0.032

Differential Set Value

(VSENSE+ to VSENSE-) (Note 2)

VIN = 7V to 28V, fSW = 500kHz

(MAX16821C)

0.028

0.030

0.032

Soft-Start Time

tSS

1024

Clock

Cycles

STARTUP/INTERNAL REGULATOR

VCC Undervoltage Lockout (UVLO)

UVLO

VCC rising

4.1

4.3

4.5

UVLO Hysteresis

VCC falling

200

VCC Output Voltage

VIN = 7V to 28V, ISOURCE = 0 to 60mA

4.85

5.10

5.30

MOSFET DRIVER

Output Driver Impedance

Low or high output, ISOURCE/SINK = 20mA

1.1

Ω

Output Driver Source/Sink Current

IDH, IDL

Nonoverlap Time

tNO

CDH/DL = 5nF

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