PRODUCT DATASHEET
AAT2845
ChargePump
TM
Electrical Characteristics
1
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.
Symbol
Description
Conditions
Min
2.7
EN/SET = ENLDO = GND
1X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current
1.5X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current
2X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current
50µA Setting, 1X Mode
20mA Setting, T
A
= 25°C
1mA Setting, T
A
= 25°C
V
IN
- V
F
= 1.5V
Four-Channel Backlight Driver with Dual LDOs
Typ
Max
5.5
1.0
1.0
3.0
5.0
Units
V
µA
Power Supply
IN
Input Voltage
I
SHDN
Total Shutdown Current at VIN and LDOIN
Charge Pump
I
CC
Operating Current
mA
I
DX
I
(D-Match)
Average Current Accuracy
18
0.9
Current Matching
2
1X to 1.5X or 1.5X to 2X Transition
V
TH
Threshold at Any DX Pin
T
SS
Soft-Start Time
Clock Frequency
F
CLK
T
SD
Over-Temperature Shutdown Threshold
T
HYS
Over-Temperature Shutdown Hysteresis
EN/SET Logic Control
T
EN/SET LO
EN/SET Low Time
T
EN/SET HI MIN
Minimum EN/SET High Time
T
EN/SET HI MAX
Maximum EN/SET High Time
T
OFF
EN/SET Off Timeout
T
LAT
EN/SET Latch Timeout
EN/SET Input Low Threshold Voltage
V
IL(EN/SET)
V
IH(EN/SET)
EN/SET Input High Threshold Voltage
I
EN/SET
EN/SET Input Leakage
50
20
1.0
0.5
150
100
1
140
15
µA
22
1.1
1.0
mA
%
mV
µs
MHz
°C
°C
75
µs
ns
µs
µs
µs
V
V
µA
0.3
50
75
500
500
0.4
V
EN/SET
= V
IN
= 5V
1.4
-1
1
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 correla-
tion with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
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