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PDF A8480 Data sheet ( Hoja de datos )
| Número de pieza | A8480 | |
| Descripción | Boost Regulator | |
| Fabricantes | Allegro Micro Systems | |
| Logotipo |  |
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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)
1 page  
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A8480
Boost Regulator for Display Bias or LED Driver
90.00
85.00
80.00
75.00
70.00
65.00
60.00
55.00
50.00
0
90.00
85.00
80.00
75.00
70.00
65.00
60.00
55.00
50.00
0
Performance Characteristics
Tests performed using application circuit shown in figure 4
L1 =4.7 μH, CIN= COUT= 1 μF, TA= 25°C (unless otherwise noted)
Efficiency versus Load Current
VOUT = 12 V
VIN
(V)
5.0
4.2
3.3
2.5
20 40 60
Load Current (mA)
80
1.00
0.50
0
-0.50
-1.00
-1.50
-2.00
-2.50
-3.00
0
Load Regulation
VOUT = 12 V
VIN
(V)
45.2.0
34.3.2
23.5.6
3.0
20 40 60 80 100 120 140 160
IOUT (mA)
VOUT = 15 V
VIN
(V)
5.0
4.2
3.3
2.5
20 40 60
Load Current (mA)
80
1.00
0.50
0
-0.50
-1.00
-1.50
-2.00
-2.50
-3.00
0
Load Regulation
VOUT = 15 V
20 40 60 80 100 120 140 160
IOUT (mA)
VIN
(V)
5.0
4.2
3.6
3.0
90.00
85.00
80.00
75.00
70.00
65.00
60.00
55.00
50.00
0
Efficiency versus Load Current
VOUT = 18 V
20 40 60
Load Current (mA)
80
VIN
(V)
5.0
4.2
3.3
2.5
1.00
0.50
0
-0.50
-1.00
-1.50
-2.00
-2.50
-3.00
0
Load Regulation
VOUT = 18 V
VIN
(V)
5.0
4.2
3.6
3.0
20 40 60 80 100 120 140 160
IOUT (mA)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
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A8480
Boost Regulator for Display Bias or LED Driver
CIN
Li+
Battery
VOUT
L1
D1
B1[3]
[1]
B2[2]
A8480
VIN SW
[PGND]
CAP
A3[10]
A2[9]
FB[FB1] OUT1 B3[8]
C1[4]
FBADJ
GND A1[7]
R1
DIM
C2[5]
ON1
C3[6]
COUT
R3
R2 R4
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 5. Main and sub OLED bias with both grounded
VBATT
+8 to 16 V
CIN
VIN
+5 V
VOUT
L1
D1
A1[1]
A8480
GND[PGND]
SW
A3[10]
COUT
B2[2]
FB[FB1]
B1[3]
VIN
CAP A2[9]
OUT1 B3[8]
C1[4] FBADJ [GND] [7]
EJ only
DIM
C2[5]
ON1 C3[6]
R1
R2
R3
R4
18 V
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
Efficiency versus Input Voltage
96
95
94
300 mA
93
92
91
250 mA
90
89 200 mA
88
87
8 10 12 14
VBATT (V)
16
Figure 6. OLED supply for GPS/Auto Infotainment,
with external output disconnect FET
CIN
3V
L1
D1
B1[3]
A8480
VIN
SW
A3[10]
[1] [PGND]
CAP A2[9]
B2[2] FB[FB1] OUT1 B3[8]
C1[4] FBADJ
GND A1[7]
C2[5] DIM
ON1
C3[6]
VOUT
R2
2.5Ω
COUT
3.4 V
250 mA
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 7. A8480 driving high current flash/torch LEDs
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A8480.PDF ] | |
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