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PDF AAT2801 Data sheet ( Hoja de datos )
| Número de pieza | AAT2801 | |
| Descripción | Multi-Mode Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
General Description
Features
ChargePump™
The AAT2801 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product family.
• VIN Range: 2.7V to 5.5V
• Dual Charge Pump
It has a dual charge pump architecture designed to
— Flash: Charge Pump Doubler
support both the white LED backlight and flash appli-
— Backlight: Tri-Mode Charge Pump
cations for systems operating with Lithium-Ion bat-
teries. The backlight charge pump provides power
• Drives Low-VF and High-VF LEDs
• Up to Four 30mA Outputs
required to drive up to four LEDs. To maximize
• 32-Position Logarithmic Scale with Digital
power efficiency, it automatically selects 1X, 1.5X, or
Control
2X mode. The device produces current levels up to
• Low Noise Constant Frequency Operation
30mA on each of its four current source outputs.
• 1MHz Switching Frequency
AnalogicTech's Simple Serial Control™ (S2Cwire™)
• AutoBias Technology
interface is used to enable, disable, and set the LED
drive current with a 32-level logarithmic scale LED
• Regulated 4.5/5.0 Volts VOUT_FLASH
• Up to 250mA of Current for Flash
brightness control.
• Automatic Soft Start
The flash charge pump is a charge pump doubler
with a regulated output voltage. It is designed to
deliver 120mA of continuous current and up to
• No Inductors
• IQ <1µA in Shutdown
• Available in 16-pin TDFN44 Package
250mA of pulsed current. It has an independent
enable pin for improved power savings.
Applications
The AAT2801 is equipped with AnalogicTech’s
AutoBias™ technology which allows individual LEDs •www.DataSheet4U.com Display Modules
to be powered either by charge pump or battery
• Mobile Phones
input, determined internally and automatically to
• PDAs
maximize the power efficiency even with a large dif-
• Smart Phones
ference in LED forward voltage.
The AAT2801 has thermal protection and built-in
soft-start circuitry. A high charge pump switching fre-
quency enables the use of very small external capac-
itors. The AAT2801 is available in the 16-pin
TDFN44 package.
Typical Application
C1 C2 C3
1μF 1μF 1μF
C1+
IN
C1- C2+
C2- C3+ C3-
OUT_FLSH
CP
VIN CIN CCP
1μF 1μF
AAT2801
D1
D2
D3
EN/SET
EN/SET
D4
Flash Enable
EN_FLSH
GND
CF
1μF
RB
Flash LED
Backlight
D4 D3 D2 D1
2801.2006.04.1.3
1
1 page  
AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Typical Characteristics–White LED Backlight Driver Section
VIN = 3.5V, CIN = 2.2µF, CCP = C1 = C2 = 1.0µF; TA = 25°C, unless otherwise noted.
Efficiency vs. VIN
(Code 26)
100
90
80 3.0VF
70
60
50 3.5VF
40
30
2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Input Voltage (V)
Efficiency vs. VIN
(D1 = 3.5V; D2 = 3.3V; D3 = 3.2V; D4 = 3.0V)
100
90
Code 26
80
70
60
50
Code 28 Code 32
40
30
2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Input Voltage (V)
Efficiency vs. VIN
(D1-D2 = 3.5V; D3-D4 = 3.2V)
100
90 Code 26
80
70
60
50
40 Code 28 Code 32
30
2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Input Voltage (V)
Operating Current
(Code 23; EN_FLSH Off)
5.0
4.0 V_DX = 3.3V
3.0
2.0
1.0
V_DX = 3.0V
0.0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Operating Current
(Code 23; EN_FLSH On; IOUT = 100mA)
8.0
7.0 V_DX = 3.3V
6.0
5.0
4.0
3.0
2.0
V_DX = 3.0V
1.0
0.0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
2801.2006.04.1.3
5
5 Page 
AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Typical Characteristics–Flash Driver Charge Pump Section
VIN = 3.5V, CIN = 2.2µF, C3 = CF = 1.0µF, TA = 25°C, unless otherwise noted.
Output Voltage vs. Output Current
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
VIN=3.3 VIN=3.6
VIN = 2.7
VIN = 3.0
40 80 120 160
Output Current (mA)
200
Efficiency vs. Supply Voltage
100
90 50mA
80
70
60
50 100mA
150mA
40
30
20
10
0
2.7
3.0
3.3 3.6 3.9
Supply Voltage (V)
4.2
4.5
Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.0V
VIN = 3.3V
VIN = 3.6V
1.0 10 100
Load Current (mA)
1000
Maximum Current Pulse vs. Supply Voltage
600
500
400
300
200
100
0
3.0
One-shot pulse duration = 250ms
VOUT> 4.0V
3.2 3.4 3.6 3.8 4.0
Supply Voltage (V)
4.2
Load Response
(100mA Load)
VIN = 3.5V
VOUT
(10mV/div)
IOUT
(50mA/div)
2801.2006.04.1.3
Time (5ms/div)
Load Response
(50mA Load)
VOUT
(10mV/div)
VIN = 3.5V
IOUT
(20mA/div)
Time (5ms/div)
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AAT2801.PDF ] | |
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