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A8481EEJTR-T Datasheet

  • A8481EEJTR-T

  • Dual Output Boost Regulator Using Single Inductor

  • 12頁(yè)

  • ALLEGRO   ALLEGRO

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A8481
Dual Output Boost Regulator Using Single Inductor
Features and Benefits
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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
渭A
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
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.
The A8481 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
渭A.
Package: 10 pin MLP/DFN (suffix EJ) with
exposed thermal pad
The A8481 is available in a 10-pin 3 mm 脳 3 mm MLP package
that has a nominal height of only 0.75 mm.
Applications include:
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Dual-panel cellular phone with OLED and
WLED backlight
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Personal Digital Assistant (PDA)
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Camcorder, personal stereo, MP3 player, camera
Approximate Scale 1:1
Typical Applications
Additional applications on page 11
V
OUT
L1
1
CIN
V
SUPPLY
2
3
4
5
GND
FB1
VIN
SW
CAP
10
9
8
7
6
R1
OLED
V
SUPPLY
D1
COUT
CIN
1
2
3
4
5
GND
FB1
VIN
L1
SW
CAP
10
9
8
7
6
R1
OLED
PWM
Q1
RP
RSET
R2
D1
COUT
V
OUT
A8481
OUT1
ISET
ON1
A8481
OUT1
ISET
ON1
OUT2
ON2
OUT2
ON2
RSET
R2
Figure 1a. Typical application circuit for A8481
driving OLED and three WLEDs
8481-DS, Rev. 2
Figure 1b. OUT2 current dimming with PWM on
ISET pin, with parallel resistor

A8481EEJTR-T 產(chǎn)品屬性

  • 10

  • -40°C 到 +85°C

  • No SVHC (19-Dec-2011)

  • 8481

  • DFN

  • 1.5A

  • Boost

  • 9V

  • 2.7V

  • 表面安裝

  • 9V

  • 23V

  • 1.2MHz

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