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PDF AAT2862 Data sheet ( Hoja de datos )
| Número de pieza | AAT2862 | |
| Descripción | Backlight LED Driver And Multiple LDO Lighting Management Unit | |
| Fabricantes | Analogic Corporation | |
| Logotipo |  |
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ChargePumpTM
PRODUCT DATASHEET
AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
General Description
The AAT2862 is a highly integrated charge pump-based
lighting management unit with four linear regulators
optimized for single-cell lithium-ion/polymer systems.
The charge pump provides power for all LED outputs and
multiple LED configurations are available. The LED out-
puts can be programmed up to 30mA each and two LED
outputs can be programmed up to 60mA each. An I2C
serial digital interface is used to enable, disable, and set
the current to one of 32 levels. Current matching is bet-
ter than 3% for uniform display brightness, and high
current matching is better than 5% for uniform power
dissipation.
The AAT2862 also offers four high-performance low-
noise MicroPower™ low dropout (LDO) linear regulators.
The regulators are enabled and their output voltages are
set through the I2C serial interface. Each LDO can supply
up to 200mA load current and ground-pin current is only
80μA making the AAT2862 ideal for battery-operated
applications.
The AAT2862 is available in a Pb-free, space saving
TQFN34-24 package and operates over the -40°C to
+85°C ambient temperature range.
Features
• Input Voltage Range: 2.7V to 5.5V
• Tri-Mode Charge Pump
▪ Drives up to Eight LEDs
▪ 32 Programmable Backlight Current with Auto-fade
▪ Settings Ranging From 500μA to 30mA
▪ Drives up to Two Auxiliary LEDs
▪ 1MHz Switching Frequency
▪ Automatic Soft Start
▪ I2C Selectable Drivers
• Four Linear Regulators
▪ 200mA Output Current
▪ 200mV Dropout
▪ I2C Programmable Output Voltage from
1.2V to 3.3V
▪ Output Auto-Discharge for Fast Shutdown
• Built-In Thermal Protection
• Automatic Soft Start
• -40°C to +85°C Temperature Range
• TQFN34-24 Package
Applications
• Camera Enabled Mobile Devices
• Digital Still Cameras
• Multimedia Mobile Phones
2862.2009.03.1.2
www.analogictech.com
1
1 page  
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ChargePumpTM
PRODUCT DATASHEET
AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
Absolute Maximum Ratings1
TA = 25OC unless otherwise noted.
Symbol
Description
IN, OUT, BL1, BL2, BL3, BL4, BL5, BL6, BL7/AUX1, BL8/AUX2 Voltage to PGND and AGND
C1+, C2+ Voltage to PGND and AGND
C1-, C2-, LDOA, LDOB, LDOC, LDOD, EN, SDA, SCL Voltage to PGND and AGND
PGND to AGND
Value
-0.3 to 6.0
-0.3 to VOUT + 0.3
-0.3 to VIN + 0.3
-0.3 to + 0.3
Units
V
V
V
V
Thermal Information2, 3
Symbol
ΘJA
PD
TJ
TLEAD
Description
Thermal Resistance
Maximum Power Dissipation
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
Value
50
2
-40 to 150
300
Units
OC/W
W
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Derate 20mW/°C above 25°C ambient temperature.
3. Mounted on a FR4 circuit board.
2862.2009.03.1.2
www.analogictech.com
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ChargePumpTM
PRODUCT DATASHEET
AAT2862
Backlight LED Driver and Multiple LDO Lighting Management Unit
Typical Characteristics
LDO A/B/C/D Load Transient Response
(ILDO = 10mA to 200mA; VIN = 3.6V; VOUT = 1.8V; CLDO = 2.2µF)
200
100
0
2.00
1.90
1.80
1.70
1.60
Time (20µs/div)
LDO A/B/C/D Line Transient Response
(VIN = 3.6V to 4.2V; ILDO = 10mA; VOUT = 1.8V; CLDO = 2.2µF)
4.4
4.0
3.6
1.82
1.81
1.80
1.79
1.78
Time (1ms/div)
LDO A/B/C/D Turn On Characteristic
(VIN = 3.6V; VOUT = 1.8V; CLDO = 2.2µF)
4.0
2.0
0.0 2.0
1.5
1.0
0.5
0.0
Time (20µs/div)
LDO A/B/C/D Turn On Characteristic
(VIN = 3.6V; VOUT = 3.3V; CLDO = 2.2µF)
4.0
2.0
0.0 4.0
3.0
2.0
1.0
0.0
Time (20µs/div)
EN, SDA, SCL Input High Threshold Voltage
vs. Input Voltage
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-40°C
0.6 25°C
0.5 85°C
0.4
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)
EN, SDA, SCL Input Low Threshold Voltage
vs. Input Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4 -40°C
25°C
0.3 85°C
0.2
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)
2862.2009.03.1.2
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| PDF Descargar | [ Datasheet AAT2862.PDF ] | |
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