Boost Regulator. A8480 Datasheet

A8480 Regulator. Datasheet pdf. Equivalent

Part A8480
Description Boost Regulator
Feature www.DataSheet4U.com A8480 Boost Regulator for Display Bias or LED Driver Features and Benefits ▪ O.
Manufacture Allegro Micro Systems
Datasheet
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A8480
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A8480
Boost Regulator for Display Bias or LED Driver
Features and Benefits
Output disconnect during shutdown
1 μA shutdown current
2.7 to 9 V input
Operate with 1 or 2 Li+ battery input supply
Output voltage up to 23 V
1.2 MHz switching frequency
1.5 A switch current limit
Internal overvoltage and overtemperature protection,
and soft start
Package:
9-pin CSP (suffix CG)
10-pin MLP/DFN (suffix EJ)
with exposed thermal pad
Approximate Scale 1:1
Description
TheA8480 is a 1.2 MHz optimized boost converter with internal
soft-start and compensation to support WLED, flash/torch,
and display bias applications. The input voltage range of
2.7 to 9 V supports either 1 or 2 Li-ion battery applications.
The high voltage integrated double-diffused MOSFET(DMOS)
allows output voltages as high as 23 V with a switch current
limit of 1.5 A, this increases the maximum quantity of LEDs
that can be used in series.
To maximize battery life in the application, the output can be
completely disconnected from the battery voltage to virtually
eliminate leakage current in the system. For system protection,
the A8480 has internal overtemperature and overvoltage
protection.
The A8480 is available in both 1.6 mm × 1.6 mm, 0.5 mm
nominal height CSP, and 3 mm × 3 mm, 0.75 mm nominal
height MLP/DFN packages.
Applications include:
WLED flash/torch
WLED backlight
OLED bias supplies
LCD bias supplies
General purpose boost converter
8480-DS
Typical Applications
VSUPPLY
2.8 to 5 V
CIN
1 μF
6.3 V
L1
22 μH
MBRA130LT3
VOUT
D1
EJ only
B1[3]
[1]
VIN A8480
[PGND]
SW
A3[10]
B2[2] FB[FB1]
CAP A2[9]
RADJ
12.1 kΩ
C1[4] FBADJ
C2[5] DIM
OUT1
B3[8]
GND A1[7]
ON1
C3[6]
48 kΩ
COUT
2.2 μF
16 V
30 Ω
Square brackets indicate pin names or numbers used only with the EJ package;
where no brackets are shown with a pin name, name applies to both CG and EJ packages
Figure 1. Using the A8480 to drive a flash (100 mA) or torch (20 mA)



A8480
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A8480
Boost Regulator for Display Bias or LED Driver
Functional Block Diagram
VIN
FB
[EJ only: FB1]
ON1
DIM
VREF1
0.6 V
Error Amplifier
C2
C4
UVLO
Soft
Start
Ramp
Oscillator
VCAP
Temp
Fault
Protection
Clock
RQ
S
On/Off
Logic
Driver
SW
S1
C1
CG only
PGND
EJ only
CAP
S2
OUT1
FBADJ
S3
PAD
EJ only
GND
Absolute Maximum Ratings
Input or Output Voltage
SW, CAP, OUT1, FBADJ pins .................................–0.3 to 26 V
VIN pin, VIN.............................................................–0.3 to 9.5 V
All other pins, Vx ....................... –0.3 to VIN + 0.3 V (7 V max.)
Operating Ambient Temperature, TA ................................ –40°C to 85°C
Maximum Junction Temperature, TJ(max)...................................... 150°C
Storage Temperature, Tstg............................................. –55°C to 150°C
Package Thermal Characteristics
EJ package: RθJA = 45 °C/W, on a 4-layer board. Additional
information is available on the Allegro Web site.
Packages are lead (Pb) free.
EJ package has 100% matte tin leadframe plating.
Selection Guide
Part Number
Package
A8480ECGLT-Tb 9-bump chip scale package
A8480EEJTR-T 10-pin MLP/DFN package
aContact Allegro for additional packing options.
bContact Allegro factory for availability.
Packinga
Tape and Reel
1500 pieces per reel
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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