MAX16821B datasheet(5/25 Pages) MAXIM

Part #	MAX16821B

Description	High-Power Synchronous HBLED Drivers with Rapid Current Pulsing

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Power Synchronous HBLED

Drivers with Rapid Current Pulsing

_______________________________________________________________________________________

5

Note 1: All devices are 100% production tested at +25°C. Limits over temperature are guaranteed by design.

Note 2: Does not include an error due to finite error amplifier gain. See the

Voltage-Error Amplifier section.

ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ENABLE INPUT (EN)

EN Input-Voltage High

EN rising

2.437

2.5

2.562

V

EN Input Hysteresis

0.28

V

EN Pullup Current

IEN

13.5

15

16.5

µA

THERMAL SHUTDOWN

Thermal Shutdown

165

°C

Thermal-Shutdown Hysteresis

20

°C

Typical Operating Characteristics

(VIN = 12V, VDD = VCC = 5V, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT (IQ) vs. FREQUENCY

FREQUENCY (kHz)

1300

900

1100

500

700

300

1

2

3

4

5

6

7

8

9

10

0

100

1500

VIN = 24V

EXTERNAL CLOCK

NO DRIVER LOAD

VIN = 5V

VIN = 12V

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

60

35

10

-15

45

50

55

60

65

70

40

-40

85

VIN = 12V

CDH/DL = 22nF

VCC LOAD REGULATION vs. VIN

VCC LOAD CURRENT (mA)

135

120

90 105

30 45 60 75

15

4.6

4.7

4.8

4.9

5.0

5.1

5.2

5.3

5.4

5.5

4.5

0150

VIN = 24V

VIN = 7V

VIN = 12V

DRIVER RISE TIME

vs. DRIVER LOAD CAPACITANCE

LOAD CAPACITANCE (nF)

20

15

510

20

40

60

80

100

120

140

160

180

200

0

025

DH

DL

DRIVER FALL TIME

vs. DRIVER LOAD CAPACITANCE

LOAD CAPACITANCE (nF)

20

15

510

20

40

60

80

100

0

025

DH

DL

HIGH-SIDE DRIVER (DH) SINK

AND SOURCE CURRENT

MAX16821A toc06

2A/div

100ns/div

CLOAD = 22nF

VIN = 12V

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