MAX8901B 查看數據表（PDF） - Maxim Integrated

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MAX8901B

Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

Maxim Integrated 

MAX8901A/MAX8901B

Highest Efficiency Supply

for 2 to 6 Series WLEDs in a

2mm x 2mm TDFN Package

Electrical Characteristics (continued)

(VIN = VON = VOVP = 3.6V, VPGND = VGND = 0V, COMP, CS, and LX are unconnected, TA = -40°C to +85°C, unless otherwise noted.

Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Serial Dimming

Full-Scale LED Current Accuracy

ILED = 24.75mA

(MAX8901B)

TA = +25°C

-1.3

TA = -40°C to +85°C -3

+1.3

%

+3

%

PWM Frequency for PWM

Dimming Control

fPWM MAX8901A

100

kHz

CS to COMP Transconductance

40

60

80

µS

Soft-Start Interval

tSOFT-

START

CCOMP = 0.022µF (Figure 1)

10

ms

Thermal Shutdown

OSCILLATOR

Operating Frequency

Maximum Duty Cycle

n-CHANNEL SWITCH

LX Leakage Current

n-Channel Switch On-Resistance

n-Channel Current Limit

fSW

DMAX

VCS = 0.4V

ILXLKG

RLX

ILIM

VLX = 27V

TA = +25°C

TA = +85°C

160

°C

700 750 800

kHz

90

92

%

0.1

5

µA

0.1

0.7

1.4

Ω

0.63 0.70 0.77

A

Note 1: Specifications to -40°C are guaranteed by design and characterization and are not production tested.

STEP

0

tHI_INIT

> 40μs

ON

tSOFT-START

ILED_

SHUTDOWN

FULL

1

2

3

4

5

28 29 30 31 32 33

tLO

32/33

31/33

500ns TO 500μs

30/33 29/33 28/33

tHI

> 500ns

tSHDN

FULL 32/33 1.33ms (typ)

6/33 5/33 4/33 3/33 2/33 1/33

SHUTDOWN

Figure 1. MAX8901B Timing Diagram

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