Diodes PAM2810 User Manual

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Description

The PAM2810 provides 4 regulated current sinks, capable of sinking

up to 40mA current to accommodate 4 white LEDs. It requires no

charge pump, has no noise and EMI, and significantly improves the

efficiency in Li bettery range.

LED brightness can be controlled by PWM techniques. The constant

current sink is set with an external sense resistor.

Alternatively, a PWM signal applied to the EN pin can vary the

anticipated brightness of the LED. The device is in shut down mode

when the EN input is logic low.

The PAM2810 is available in SOT23-8 and DFN2mmx2mm

packages.

Features

4-CHANNEL PROGRAMMABLE LED CURRENT

Pin Assignments

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PAM2810

• Cost Effective LED Driver

• Support up to 4 White LEDs

• Output Current up to 40mA per LED

• Low Dropout Voltage

• Ultra Low Quiescent Supply Current: 65 A (typ)

• No Noise and EMI

• Shutdown Current Less than 1 A

• Over Temperature Protection

• Small Packages : SOT23-8 and DFN2mmx2mm

• Pb-free Package

Typical Applications Circuit

Applications

• White LED for LCD Display Backlights

• White LED Keypad Backlights

• 1-Cell Li-Ion Battery-operated Equipment Including:

 PDAs

 Hand-Held PCs

 Cellular Phone

PAM2810

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Typical Applications Circuit (cont.)

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PAM2810

Pin Description

Name

VIN 1

GND 2

EN 3

ISET 4

LED4 5 5 LED4 Cathode Terminal

LED3 6 6 LED3 Cathode Terminal

LED2 7 7 LED2 Cathode Terminal

LED1 8 8 LED1 Cathode Terminal

PAM2810

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Pin Number

DFN2x2 SOT23-8

4

3 Ground

2 Enable, Allow PWM Brightness Control, Active High

1 LED Current Adjustment Pin

Input Voltage

Function

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Block Diagram

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PAM2810

Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.

Parameter Rating Unit

Input Voltage Range -0.3 to +6.0

PWM Pin Voltage

Maximum Junction Temperature 150

Storage Temperature -65 to +150

Soldering Temperature 300, 5sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Input Voltage Range 2.7 to 5.5 V

Junction Temperature Range -40 to +125

Ambient Temperature Range -40 to +85

PAM2810

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= +25°C, unless otherwise specified.)

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-0.3 to (V

+0.3)/6V

IN

= +25°C, unless otherwise specified.)

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°C

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PAM2810

Thermal Information

Parameter Symbol Package Max Unit

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

θ

JA

θ

JC

Electrical Characteristics (@T

= +25°C, VIN = 3.6V, R

A

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage Range

Output Current

Current Matching Between Any Two Outputs

Current Sink Dropout

ISET PIN Voltage

Output Current to Current Set Ratio

Quiescent Supply Current

Shutdown Supply Current

EN Input Logic High

EN Input Logic Low

EN Pin Current

V

IN

I

LEDX

I

LED-MATCH

V

DROPOUT

V

SET

I

LEDX/ISET

I

Q

I

SHDN

V

HI

V

LO

I

EN

VDD = 5V

±5 %

R

100

R

EN = Logic Low 0.1 1 µA

1.4 V

0.4 V

V(EN) = 1.5V 0.1 1 µA

V(EN) = 0V 0.1 1 µA

PAM2810

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SOT23-8 250

DFN2x2-8 80

SOT23-8 130

DFN2x2-8 30

= 5.1kΩ, V

SET

= 0.5V, unless otherwise specified.)

LEDX

= 3kΩ, I

SET

= 10MΩ, with no loads

SET

LEDX

= 40mA

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°C/W

Vf = V

(Note 1)

LED

3.6 5.5 V

40 mA

0.25 V

1.22 V

65 80 µA

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