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
Description
Conditions
Min Typ Max Units
Power Supply
VIN
Input Voltage
2.7
5.5
1.0
V
Total Shutdown Current at VIN
and LDOIN
ISHDN
EN/SET = ENLDO = GND
µA
Charge Pump
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
1.0
3.0
5.0
mA
ICC
Operating Current
50
20
µA
mA
%
18
22
1.1
1.0
IDX
I(D-Match)
VTH
Average Current Accuracy
0.9
1.0
0.5
Current Matching2
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any DX Pin
Soft-Start Time
150
mV
TSS
100
1
µs
FCLK
Clock Frequency
MHz
Over-Temperature Shutdown
Threshold
TSD
140
15
°C
°C
Over-Temperature Shutdown
Hysteresis
THYS
EN/SET Logic Control
TEN/SET LO
TEN/SET HI MIN
TEN/SET HI MAX
TOFF
EN/SET Low Time
0.3
-1
75
µs
ns
µs
µs
µs
µA
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
50
75
500
500
1
TLAT
EN/SET Latch Timeout
EN/SET Input Leakage
IEN/SET
VEN/SET = VIN = 5V
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
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
