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AAT2845 데이터시트 PDF




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부품번호 AAT2845 기능
기능 Four-Channel Backlight Driver
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AAT2845 데이터시트, 핀배열, 회로
www.DataSheet4U.com
AAT2845
Four-Channel Backlight Driver with Dual LDOs
General Description
Features
ChargePump
The AAT2845 is a highly integrated power solution
for single-cell lithium-ion-based LCD display appli-
cations. It includes a four-channel LED backlight
driver and two integrated 200mA LDOs as addi-
tional power supplies for display and camera-relat-
ed chipsets.
The backlight driver is a low noise, constant fre-
quency charge pump DC/DC converter that uses a
tri-mode load switch (1X), fractional (1.5X), and
doubling (2X) conversion to maximize efficiency.
Each of the four channels is capable of driving up
to 20mA per channel.
AnalogicTech's S2Cwire™ (Simple Serial Control™)
serial digital input is used to enable, disable, and
set current for each LED with 16 available settings
down to 50µA. The low current mode supply current
can be as low as 50µA to save power and maintain
high efficiency.
Each LED output is equipped with built-in protec-
tion for short-circuit and auto-disable functions.
Built-in soft-start circuitry prevents excessive
inrush current during start-up. A low current shut-
down feature disconnects the load from VIN and
reduces quiescent current to less than 1µA.
The AAT2845 is available in a Pb-free, thermally-
enhanced 20-pin 3x4mm TQFN package.
• Input Voltage Range: 2.7V to 5.5V
• Four-Channel LED Driver:
— Tri-Mode Charge Pump
— Up to 20mA/Channel
— Easy Control with Single Wire Interface
— 16 Current Levels
— Four Low Current Settings Down to 50µA
— Low IQ (50µA) for Low Current Mode
— >90% Peak Efficiency
• Dual 200mA LDOs
• Automatic Soft-Start
• Over-Temperature Protection
• Available in 3x4mm TQFN34-20 Package
• -40°C to +85°C Temperature Range
Applications
• Camera Function Power Supplies
• Camera Phone Displays
• LCD Modules
• White LED Backlighting
Typical Application
VBAT
3.6V
CIN
2.2µF
S2Cwire Backlight Control
LDO Enable
CBYP
0.1µF
CF1 CF2
1µF 1µF
C1- C1+ C2- C2+
IN OUT
AAT2845
D1
D2
D3
D4
IN LDOA
FBA
EN/SET
ENLDO
LDOB
CBP
GND
FBB
COUT
1µF
200mA
Co1
200mA
Co2
2845.2006.12.1.0
1




AAT2845 pdf, 반도체, 판매, 대치품
AAT2845
Four-Channel Backlight Driver with Dual LDOs
Electrical Characteristics1
CIN = CO1 = CO2 = 2.2µF, C1 = C2 = 1.0µF, CBP = 0.1µF; TA = 25°C, unless otherwise noted. Typical values are
at TA = 25°C and VIN = 3.6V.
Symbol
Power Supply
VIN
ISHDN
Charge Pump
Description
Input Voltage
Total Shutdown Current at VIN
and LDOIN
ICC Operating Current
IDX Average Current Accuracy
I(D-Match)
VTH
Current Matching2
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any DX Pin
TSS
FCLK
TSD
Soft-Start Time
Clock Frequency
Over-Temperature Shutdown
Threshold
THYS
Over-Temperature Shutdown
Hysteresis
EN/SET Logic Control
TEN/SET LO
TEN/SET HI MIN
TEN/SET HI MAX
TOFF
TLAT
IEN/SET
EN/SET Low Time
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
Conditions
EN/SET = ENLDO = GND
1X Mode, 3.0 VIN 5.5,
Active, No Load Current
1.5X Mode, 3.0 VIN 5.5,
Active, No Load Current
2X Mode, 3.0 VIN 5.5,
Active, No Load Current
50µA Setting, 1X Mode
20mA Setting, TA = 25°C
1mA Setting, TA = 25°C
VIN - VF = 1.5V
VEN/SET = VIN = 5V
Min Typ Max Units
2.7 5.5 V
1.0 µA
1.0
3.0 mA
5.0
50 µA
18
0.9
20
1.0
22
1.1
mA
0.5 1.0 %
150 mV
100 µs
1 MHz
140 °C
15 °C
0.3 75 µs
50 ns
75 µs
500 µs
500 µs
-1 1 µA
1. The AAT2845 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4 2845.2006.12.1.0

4페이지










AAT2845 전자부품, 판매, 대치품
AAT2845
Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
CIN = CO1 = CO2 = 2.2µF, C1 = C2 = 1.0µF, CBP = 0.1µF; TA = 25°C, unless otherwise noted. Typical values are
at TA = 25°C and VIN = 3.6V.
Backlight Operating Characteristic
(VIN = 2.9V; 2X Mode; 14mA/ch Load)
Backlight Operating Characteristic
(VIN = 2.9V; 2X Mode; 20mA/ch Load)
VIN
(20mV/div)
VCP
(40mV/div)
VSINK
(40mV/div)
VIN
(20mV/div)
VCP
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
Backlight Operating Characteristic
(VIN = 3.5V; 1.5X Mode; 14mA/ch Load)
VIN
(20mV/div)
VCP
(40mV/div)
VSINK
(20mV/div)
Time (500ns/div)
Backlight Operating Characteristic
(VIN = 3.7V; 1.5X Mode; 20mA/ch Load)
VIN
(20mV/div)
VCP
(40mV/div)
VSINK
(20mV/div)
Time (500ns/div)
EN/SET Latch Timeout vs. Supply Voltage
400
350
300 -40°C
250
200
150
100 25°C 85°C
50
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
Supply Voltage (V)
2845.2006.12.1.0
EN/SET Off Timeout vs. Supply Voltage
500
450
400
350 -40°C
300
250
200
150 25°C 85°C
100
50
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
Supply Voltage (V)
7

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