PRODUCT DATASHEET
AAT2845
ChargePump
TM
Typical Characteristics
IN = 3.6V; C
IN
= C
OUTA
= C
OUTB
= 2.2µF; C
OUT
= 1µF; C
1
= C
2
= 1.0µF; C
BP
= 0.1µF; T
A
= 25°C, unless otherwise noted.
Typical values are at T
A
= 25°C.
Four-Channel Backlight Driver with Dual LDOs
Backlight Operating Characteristic
(V
IN
= 2.9V; 2X Mode; 14mA/ch Load)
Backlight Operating Characteristic
(V
IN
= 2.9V; 2X Mode; 20mA/ch Load)
V
IN
(20mV/div)
V
CP
(40mV/div)
V
SINK
(40mV/div)
V
IN
(20mV/div)
V
CP
(40mV/div)
V
SINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
Backlight Operating Characteristic
(V
IN
= 3.5V; 1.5X Mode; 14mA/ch Load)
Backlight Operating Characteristic
(V
IN
= 3.7V; 1.5X Mode; 20mA/ch Load)
V
IN
(20mV/div)
V
CP
(40mV/div)
V
SINK
(20mV/div)
V
IN
(20mV/div)
V
CP
(40mV/div)
V
SINK
(20mV/div)
Time (500ns/div)
Time (500ns/div)
EN/SET Latch Timeout vs. Supply Voltage
EN/SET Latch Timeout (µs)
EN/SET Off Timeout (µs)
400
350
300
250
200
150
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
500
450
400
350
300
250
200
150
100
50
EN/SET Off Timeout vs. Supply Voltage
-40°C
-40°C
25°C
85°C
25°C
85°C
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)
Supply Voltage (V)
2845.2008.05.1.2
www.analogictech.com
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
