MAX8901A 查看數據表（PDF） - Maxim Integrated

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MAX8901A

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

Absolute Maximum Ratings

IN to GND .................................................................-0.3V to +7V

CS, COMP, ON to GND ...............................-0.3V to (VIN + 0.3V)

OVP, LX to GND .....................................................-0.3V to +28V

PGND to GND .......................................................-0.3V to +0.3V

LX Current ..................................................................770mARMS

Continuous Power Dissipation (multilayer board at +70°C)

8-pin, 2mm x 2mm TDFN

(derate above +70°C by 11.9mW/°C) ..........................953mW

Operating Temperature Range ...........................-40°C to +85°C

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

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

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

Soldering Temperature (reflow) .......................................+260°C

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.

Electrical Characteristics

(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

Input Voltage

VIN

2.6

5.5

V

Input Undervoltage Lockout

Threshold

Input Overvoltage Lockout

Threshold

Shutdown Input Current

Quiescent Current

Output Voltage Range

OVP Overvoltage Protection

Threshold

OVP Input Current

CS Regulation Voltage

ON Shutdown Delay

ON High Voltage

ON Low Voltage

ON Input Current

Initial ON High Pulse Width

ON High Pulse Width

ON Low Pulse Width

VIN_UVLO

VIN_OVLO

VIN rising

VIN falling

VIN rising

VIN falling

ISHDN VON = 0V

IQ

VCS = 0.55V, no load

(not switching)

TA = +25°C

TA = +85°C

MAX8901A

MAX8901B

2.25

2.55

V

2.53

6.2

6.35

V

6.0

6.3

0.01

1

µA

0.1

70

135

µA

115 185

VOUT

VDIODE = external boost diode voltage drop

VIN -

VDIODE

VOV

V

VOV 6 LEDs with 25V OVP option

24

25

26

V

IOV

VCS

tSHDN

VON_HI

VON_LO

ION

tHI_INIT

tHI

tLO

VOVP = 20V

No dimming

Time VON is below low threshold until

shutdown (Figure 1)

2.6V < VIN < 5.5V

2.6V < VIN < 5.5V

ON = IN

TA = +25°C

TA = +85°C

First ON high pulse to enable IC

(MAX8901B) (Figure 1)

MAX8901B (Figure 1)

MAX8901B (Figure 1)

20

µA

0.475 0.50 0.525

V

1.18 1.33 1.50

ms

1.3

V

0.4

V

0.01

1

µA

0.1

40

µs

0.5

µs

0.5

500.0

µs

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