AL3157 datasheet(3/9 Pages) DIODES

3 / 9 page

AL3157

HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER

FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT

AL3157

Document number: DS35116 Rev. 1 - 2

3 of 9

www.diodes.com

March 2011

Absolute Maximum Ratings (Note 2)

Symbol

Description

Rating

Unit

ESD HBM

Human Body Model ESD Protection

ESD MM

Machine Model ESD Protection

200

VIN

Input Voltage

-0.3 to 6

VEN1,2,3

EN1, EN2, EN3 to GND Voltage

-0.3 to VIN +0.3

IOUT

Maximum DC Output Current

300

Operating Junction Temperature Range

125

°C

TLEAD

Maximum Soldering Temperature (at leads, 10 sec)

300

°C

Notes:

2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.

Recommended Operating Conditions

Symbol

Parameter

Min

Max

Unit

VIN

Input Voltage

2.7

5.5

VENL(1, 2)

EN1,2 Threshold Low

0.4

VENH(1,2)

EN1,2, Threshold High

1.4

VIN

Operating Ambient Temperature

-40

°C

Electrical Characteristics

VIN = 4V, CIN = COUT = 2.2µF, C1 = 1µF; TA = 25°C unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ.

Max

Unit

Quiescent Current

1x Mode, 3.0≤VIN≤5.5, Active,

No Load Current

0.3

0.6

2x Mode, 3.0≤VIN≤5.5, Active,

No Load Current

ISHDN

Shutdown Current

EN1, EN2 = 0

µA

ID2~4

Backlight LED Drive Sink Current

Accuracy (Note 3)

IDX = 30mA

28.5

31.5

ID1

Flash/light LED Drive Sink Current

Accuracy (Note 3)

ID1 = 210mA

199.5

210

220.5

ID-Match

Current Matching Between Any

Two Backlight LED Drive Current

Sink Outputs (Note 4)

VF: D2:D4 = 4V

Rout

Charge Pump VOUT Open Loop

Resistance

1x mode

0.5

2x mode

4.5

VTH-Dx

1x to 2x Transition Threshold at

D2, D3 and D4 Pins

ID = 30mA

150

VTH-D1

1x to 2x Transition Threshold at D1

ID1 = 210mA

150

VHS

Mode Transition Threshold

500

tSS

Soft-Start Time

100

µs

fSW

Switching Frequency

1.2

MHz

tEN1,2

EN1,2 Off Timeout

UVLO

VIN Under-Voltage Lockout

1.8

2.2

IEN1,2

EN1, 2 Input Leakage

-1

µA

TSHDN

Thermal Shutdown Protection

160

THYS

Thermal Shutdown Hysteresis

θJA

Thermal Resistance

Junction-to-Ambient

U-DFN3030-12 (Note 5)

55.29

oC/W

Notes:

Determined by the mean of channels 2,3 and 4 currents, EG (ID2 + ID3 + ID4)/3

Determined by the maximum sink current (MAX), the minimum sink current (MIN), and the average sink current (AVG).

Two matching

numbers are calculated as (MAX-AVG)/AVG and (AVG-MIN)/AVG.

The largest number of the two (worst case) is as the matching data.

Device mounted on FR-4 substrate, 2"*2", 2oz, copper, double-sided PC board.

AL3157 Datasheet(PDF) 3 Page - Diodes Incorporated

AL3157 Datasheet(HTML) 3 Page - Diodes Incorporated

Html Pages

1 2 3 4 5 6 7 8 9

Datasheet Download

Link URL