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Boost Regulator. A8480 Datasheet

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Boost Regulator. A8480 Datasheet






A8480 Regulator. Datasheet pdf. Equivalent




A8480 Regulator. Datasheet pdf. Equivalent





Part

A8480

Description

Boost Regulator



Feature


www.DataSheet4U.com A8480 Boost Regulat or for Display Bias or LED Driver Feat ures and Benefits ▪ Output disconnect during shutdown ▫ 1 μA shutdown cur rent ▪ 2.7 to 9 V input ▫ Operate w ith 1 or 2 Li+ battery input supply ▪ Output voltage up to 23 V ▪ 1.2 MHz switching frequency ▪ 1.5 A switch cu rrent limit ▪ Internal overvoltage an d overtemperature protection, and s.
Manufacture

Allegro Micro Systems

Datasheet
Download A8480 Datasheet


Allegro Micro Systems A8480

A8480; oft start Description The A8480 is a 1. 2 MHz optimized boost converter with in ternal soft-start and compensation to s upport WLED, flash/torch, and display b ias applications. The input voltage ran ge of 2.7 to 9 V supports either 1 or 2 Li-ion battery applications. The high voltage integrated double-diffused MOSF ET (DMOS) allows output voltages as hig h as 23 V with a s.


Allegro Micro Systems A8480

witch current limit of 1.5 A, this incre ases the maximum quantity of LEDs that can be used in series. To maximize batt ery life in the application, the output can be completely disconnected from th e battery voltage to virtually eliminat e leakage current in the system. For sy stem protection, the A8480 has internal overtemperature and overvoltage protec tion. The A8480 is.


Allegro Micro Systems A8480

available in both 1.6 mm × 1.6 mm, 0.5 mm nominal height CSP, and 3 mm × 3 m m, 0.75 mm nominal height MLP/DFN packa ges. Applications include: ▪ WLED fla sh/torch ▪ WLED backlight ▪ OLED bi as supplies ▪ LCD bias supplies ▪ G eneral purpose boost converter Package : 9-pin CSP (suffix CG) 10-pin MLP/DFN (suffix EJ) with exposed thermal pad A pproximate Scale 1:1 Typical .

Part

A8480

Description

Boost Regulator



Feature


www.DataSheet4U.com A8480 Boost Regulat or for Display Bias or LED Driver Feat ures and Benefits ▪ Output disconnect during shutdown ▫ 1 μA shutdown cur rent ▪ 2.7 to 9 V input ▫ Operate w ith 1 or 2 Li+ battery input supply ▪ Output voltage up to 23 V ▪ 1.2 MHz switching frequency ▪ 1.5 A switch cu rrent limit ▪ Internal overvoltage an d overtemperature protection, and s.
Manufacture

Allegro Micro Systems

Datasheet
Download A8480 Datasheet




 A8480
www.DataSheet4U.com
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
www.DataSheet4U.com
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
2




 A8480
www.DataSheet4U.com
A8480
Boost Regulator for Display Bias or LED Driver
Pin-out Diagrams
A3 A2 A1
B3 B2 B1
C3 C2 C1
1 10
29
3
PAD
8
47
56
CG Package
(Top View)
EJ Package
(Top View)
Terminal List Table
Number
CG EJ
Name
– 1 PGND
A1 – GND
– 7 GND
A2 9 CAP
A3 10 SW
B1 3 VIN
B2 – FB
– 2 FB1
B3 8 OUT1
C1 4 FBADJ
C2 5 DIM
C3 6 ON1
– PAD –
Description
Power ground connection; use to avoid interference with signal ground.
Power and signal ground connection; connect directly to the ground plane.
Signal ground reference; connect directly to the ground plane.
This is the connection to the output capacitor for the boost regulator output.
This is the connection between the internal boost switch and the external inductor.
Because rapid changes of current occur at this pin, the board traces connected to this pin
should be minimized and the inductor and diode should be connected as close to this pin
as possible.
This is the power input supply connection to the circuit. A bypass capacitor tying this pin
to GND must be connected close to this pin.
This is the feedback pin for controlling voltage on the OUT1 pin. The nominal reference
voltage on this pin is 600 mV. In order to minimize noise, connect the feedback resistor
network close to this pin.
This is the voltage-controlled output pin for the OLED drive. An internal switch
disconnects the OLED during shutdown.
Open collector output driven by DIM. This can be used to provide dimming by connecting
an additional feedback circuit or it can be used to drive external output.
Logic input. Driving DIM puts the FBADJ open collector output low.
This is the enable pin for OUT1.
Exposed thermal pad. Connect to GND plane for enhanced thermal performance.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3



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