MAX16821B datasheet(3/25 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

_______________________________________________________________________________________

3

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

OSCILLATOR

Switching Frequency Range

125

1500

kHz

RT = 500k

Ω

120

125

130

RT = 120k

Ω

495

521

547

Switching Frequency

fSW

RT = 39.9k

Ω

1515

1620

1725

kHz

120k

Ω < RT ≤ 500kΩ

-5

+5

Switching Frequency Accuracy

40k

Ω ≤ RT ≤ 120kΩ

-8

+8

%

CLKOUT Phase Shift with

Respect to DH (Rising Edges)

fSW = 125kHz, MODE connected to SGND

180

CLKOUT Phase Shift with

Respect to DL (Rising Edges)

fSW = 125kHz, MODE connected to VCC

180

Degrees

CLKOUT Output-Voltage Low

VOL

ISINK = 2mA

0.4

V

CLKOUT Output-Voltage High

VOH

ISOURCE = 2mA

4.5

V

SYNC Input High Pulse Width

tSYNC

200

ns

SYNC Input Clock High Threshold

VSYNCH

2V

SYNC Input Clock Low Threshold

VSYNCL

0.4

V

SYNC Pullup Current

ISYNC_OUT

VRT/SYNC = 0V

250

500

µA

SYNC Power-Off Level

VSYNC_OFF

0.4

V

INDUCTOR CURRENT LIMIT

Average Current-Limit Threshold

VCL

CSP to CSN

26.4

27.5

30.0

mV

Reverse Current-Limit Threshold

VCLR

CSP to CSN

-2.0

mV

Cycle-by-Cycle Current Limit

CSP to CSN

60

mV

Cycle-by-Cycle Overload

VCSP to VCSN = 75mV

260

ns

CURRENT-SENSE AMPLIFIER

CSP to CSN Input Resistance

RCS

4k

Ω

Common-Mode Range

VCMR(CS)

VIN = 7V to 28V

0

5.5

V

Input Offset Voltage

VOS(CS)

0.1

mV

Amplifier Voltage Gain

AV(CS)

34.5

V/V

3dB Bandwidth

f3dB

4

MHz

CURRENT-ERROR AMPLIFIER (TRANSCONDUCTANCE AMPLIFIER)

Transconductance

gm

550

µS

Open-Loop Gain

AVL(CE)

50

dB

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