Approximate Scale 1:1

A8481

SW

CAP

OUT1

ISET

ON1

GND

FB1

VIN

OUT2

ON2

CIN

10

9

8

7

6

L1

D1

R1

R2

RSET

COUT

5

4

3

2

1

Figure 1a. Typical application circuit for A8481

driving OLED and three WLEDs

Figure 1b. OUT2 current dimming with PWM on

ISET pin, with parallel resistor

A8481

SW

CAP

OUT1

ISET

ON1

GND

FB1

VIN

OUT2

ON2

CIN

10

9

8

7

6

L1

D1

R1

R2

RSET

RP

PWM

Q1

COUT

5

4

3

2

1

Description

The A8481 is a step-up dc-to-dc converter in a thermally-

enhanced MLP package. A constant 1.2 MHz switching

frequency, with current-mode control scheme, provides stable

low-noise operation at high load conditions.

TheA8481 is a dual output OLED + WLED driver. This device

is suitable for driving OLED bias supply as well as WLEDs

for backlight. For OLED it is capable of delivering 80 mA at

18 V, and can drive five WLEDs at 20 mA.

Independent output control and output disconnect make this

IC ideally suited for battery operated, dual display portable

applications. The IC disconnects input from the output path

during shutdown, allowing shutdown currents less than 1 μA.

TheA8481 is available in a 10-pin 3 mm × 3 mm MLP package

that has a nominal height of only 0.75 mm.

Applications include:

▪ Dual-panel cellular phone with OLED and

WLED backlight

▪ Personal Digital Assistant (PDA)

▪ Camcorder, personal stereo, MP3 player, camera

8481-DS, Rev. 2

Features and Benefits

▪ Two independently controlled channels for dual display

▪ Output voltage up to 23 V

▪ 2.7 to 9 V input

▪ Output disconnect allows less than 1 μA supply current

during shutdown

▪ Single-pin dimming control for WLED

▪ 1.2 MHz switching frequency

▪ 1.5 A switch current limit

▪ OVP, Pulse-by-Pulse OCP, OTP, and Soft Start

Dual Output Boost Regulator Using Single Inductor

Package: 10 pin MLP/DFN (suffix EJ) with

exposed thermal pad

A8481

Typical Applications

Additional applications on page 11