AAT2847IML-EE-T1 Advanced Analog Technology, Inc., AAT2847IML-EE-T1 Datasheet

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AAT2847IML-EE-T1

Manufacturer Part Number
AAT2847IML-EE-T1
Description
Four-Channel Backlight Driver with Dual LDOs
Manufacturer
Advanced Analog Technology, Inc.
Datasheet
1.AAT2847IML-EE-T1.pdf (20 pages)
General Description
The AAT2847 is a highly integrated power solution for
single cell Li-Ion/Polymer based liquid crystal display
(LCD) display applications. It includes a four channel
light emitting diode (LED) backlight driver and two inte-
grated 200mA low dropout voltage regulators (LDOs) as
additional power supplies for display and camera related
chipsets.
The backlight driver in the AAT2847 is a low noise tri-
mode DC/DC charge pump converter. Each of the four
channels of the backlight driver is capable of delivering
up to 20mA of bias currents for white LEDs. The white
LED (WLED) backlight bias current matching is 1% which
helps provide uniform display brightness.
AnalogicTech’s AS
Control™) serial digital interface is used to enable, dis-
able, and set the current for each backlight LED channel.
Each LED channel has sixteen available current level set-
tings in three separate current scales, plus four available
current level settings on a low level current scale.
Each LED channel is equipped with built-in short circuit
protection and auto disable functionality. A low shutdown
current feature disconnects the load from the input and
reduces quiescent current to less than 1µA.
The AAT2847 is available in the thermally enhanced
20-pin 3x4x0.75mm TQFN package.
Typical Application
ChargePump
2847.2008.05.1.2
3.6V
V
Backlight Control
BAT
LDO A Enable
LDO B Enable
AS
2
Cwire
2.2µF
C
IN
TM
2
Cwire™ (Advanced Simple Serial
EN/SET
C1- C1+ C2- C2+
ENA
ENB
IN
IN
GND
1µF
AAT 2847-EE
C1
1µF
C2
PGND
LDOA
LDOB
OUT
FBA
FBB
D1
D2
D3
D4
C
1µF
OUT
200mA
200mA
C
2.2µF
C
2.2µF
LDOA
LDOB
w w w . a n a l o g i c t e c h . c o m
OSRAM LW M673
or equivalent
WLEDs
Four-Channel Backlight Driver with Dual LDOs
Backlight control
3.6V
LDO A Enable
LDO B Enable
V
Features
• Input Supply Voltage Range: 2.7V to 5.5V
• Tri-Mode (1X/1.5X/2X) Charge Pump:
• Integrated LCD Display Solution:
• Single-Wire AS
• > 90% Peak Efficiency
• LDO Output Voltages:
• Over-Temperature Protection
• Available in 3x4x0.75mm TQFN34-20 Package
• -40°C to +85°C Temperature Range
Applications
• Camera Function Power Supplies
• Camera Phone Displays
• LCD Modules
• White LED Backlighting
AS
BAT
2
Cwire
▪
▪
▪
Control
▪
▪
▪
▪
▪
Delivers up to 120mA of Output Current
Four-Channel WLED Backlight
• User-Programmable WLED Current Scales: 30mA,
• User Selectable Low Level Current Scale
Dual 200mA LDOs (w/Separate Enables)
Four Addressable Registers
Fast, 1MHz Serial Interface
AAT2847-EE: User-Programmable
AAT2847-QG: 2.8V and 1.5V
AAT2847-QI: 2.8V and 1.8V
2.2µF
C
20mA and 15mA.
▪
▪
IN
Sixteen Programmable Current Level Settings
Four Programmable Current Level Settings
EN/SET
C1- C1+ C2-
ENA
ENB
IN
IN
GND
1µF
2
C1
AAT 2847-QI
Cwire Serial Interface for Configuration/
PRODUCT DATASHEET
1µF
C2
PGND
LDOA
LDOB
OUT
C2+
D1
D2
D3
D4
C
1µF
C
2.2µF
C
2.2µF
AAT2847
OUT
LDOA
LDOB
2.8V, 200mA
1.8V, 200mA
V
V
OUTA
OUTB
OSRAM LW M673
or equivalent
WLEDs
1

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AAT2847IML-EE-T1 Summary of contents

Page 1

ChargePump TM General Description The AAT2847 is a highly integrated power solution for single cell Li-Ion/Polymer based liquid crystal display (LCD) display applications. It includes a four channel light emitting diode (LED) backlight driver and two inte- grated 200mA low ...

Page 2

ChargePump ChargePump TM TM Pin Descriptions Symbol Pin # AAT2847-EE AAT2847-QG/ LDOB LDOB PGND PGND 7 FBA NC 8 LDOA LDOA 9 C2- C2- 10 C2+ C2+ 11 ...

Page 3

ChargePump ChargePump TM TM Absolute Maximum Ratings T = 25°C, unless otherwise noted. Pin descriptions below apply to AAT2847-EE (AAT2847-QG/QI) A Symbol Description V [IN, OUT, D1, D2, D3, D4] to GND N V [C1+, C1-, C2+, C2-] to GND ...

Page 4

ChargePump ChargePump TM TM Electrical Characteristics V = 3.6V 2.2µ LDOA LDOB are 25°C. A Symbol Description Power Supply V Input Voltage Range IN I Total Shutdown Current ...

Page 5

ChargePump ChargePump TM TM Electrical Characteristics V = 3.6V 2.2µ LDOA LDOB are 25°C. A Symbol Description LDOs: AAT2847- Operating Current Feedback ...

Page 6

ChargePump ChargePump TM TM Typical Characteristics Backlight Efficiency vs. Input Voltage 100 90 80 20mA/Channel 70 60 1mA/Channel 50 14.5mA/Channel 40 30 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) EN/SET Latch Timeout vs. Input Voltage 350 -40°C 300 250 ...

Page 7

ChargePump ChargePump TM TM Typical Characteristics Shutdown Current vs. Input Voltage ( 0V) EN/SET ENA/ENB 20 -40° 25° 2.7 3.1 3.5 3.9 4.3 4.7 Input Voltage (V) Backlight Operating Characteristic (V = ...

Page 8

ChargePump ChargePump TM TM Typical Characteristics Turn Mode Backlight (20mA/Channel; Address 0, Data EN/SET (2V/div) V OUT (2V/div (500mV/div (100mA/div) Time (500ns/div) Turn Mode Backlight (20mA/Channel; Address ...

Page 9

ChargePump ChargePump TM TM Typical Characteristics LDOA/LDOB Quiescent Current vs. Input Voltage (V = 1.2V) OUT 120 85°C 25°C 100 -40° 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) LDOB Load Transient Response (V = ...

Page 10

ChargePump ChargePump TM TM Typical Characteristics LDOA/LDOB Turn 3.6V 2.8V; DC Coupled) IN LDO(A/B) V EN(A/B) (2V/div) V LDO(A/B) (1V/div) Time (40µs/div) LDOA/LDOB Turn 3.6V 1.5V; DC Coupled) IN LDO(A/B) ...

Page 11

ChargePump ChargePump TM TM Functional Block Diagram (AAT 2847-QG/-QI) IN EN/SET IN ENA ENB Functional Description The AAT2847 is an integrated solution for LCD display applications with a built-in four channel white LED driver (charge pump) and dual 200mA LDO ...

Page 12

ChargePump TM 30.0 25.0 20.0 15.0 10.0 Address 0 5.0 0 Code Figure 1: LED Current Control Profile. AS Cwire Serial Interface 2 ...

Page 13

ChargePump TM EN/SET 1 Address DATA 3 DATA 0 Figure 2: AS Data Current Scale 1 20mA Scale 2 30mA Scale 3 15mA Scale 4 Low Current Mode Table 3: Current Scale Settings—Address 3. Low Current Operation (Address 4) All ...

Page 14

ChargePump TM Auto Disable Feature The charge pump in the AAT2847 is equipped with an auto-disable feature for each LED channel. After the IC is enabled and successively starts-up, a test current of 100µA (typical) is forced through each LED ...

Page 15

ChargePump (A/B) LDO(A/ 1.2V (A/B) The result 60kΩ. Since 60kΩ is not a standard 1% resistor value, 60.4kΩ is selected. From this exam- ple calculation, for V = 1.8V, use R1 = ...

Page 16

ChargePump TM Before choosing a particular capacitor, verify the capaci- tor’s performance with the characteristics illustrated in the component’s data sheet. Performance verification will help avoid undesirable component related perfor- mance deficiencies. PCB Layout To achieve adequate electrical and thermal ...

Page 17

ChargePump ChargePump TM TM Evaluation Board Layout Figure 5: AAT2847 Evaluation Board Component Side Layout. Evaluation Board Schematic DC LDOB C6 R10 R11 2847.2008.05.1.2 2847.2008.05.1.2 Four-Channel Backlight Driver with Dual LDOs Four-Channel Backlight Driver with Dual ...

Page 18

ChargePump ChargePump TM TM DATA LIGHT Four-Channel Backlight Driver with Dual LDOs Four-Channel Backlight Driver with Dual LDOs R6 DC+ DC VDD VSS 2 GP5 GP0 3 GP4 GP1 4 GP3 GP2 ...

Page 19

... Four-Channel Backlight Driver with Dual LDOs Marking LDOB 1 Programmable YLXXY 1.5V 1.8V ZDXYY PRODUCT DATASHEET PRODUCT DATASHEET AAT2847 AAT2847 Part Number (Tape and Reel) 2 AAT2847IML-EE-T1 AAT2847IML-QG-T1 AAT2847IML-QI- ...

Page 20

ChargePump ChargePump TM TM Package Information 1 3.00 ± 0.05 Top View 0.025 ± 0.025 Side View All dimensions in millimeters. 1. The leadless package family, which includes QFN, TQFN, DFN, TDFN, and STDFN, has exposed copper (unplated) at the ...

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