AAT2847
Four-Channel Backlight Driver with Dual LDOs
1
Electrical Characteristics
VIN = 3.6V; CIN = CLDOA = CLDOB = 2.2µF; COUT = 1µF; C1 = C2 = 1µF; TA = 25°C, unless otherwise noted.
Typical values are at TA = 25°C.
Symbol Description
Power Supply
Conditions
Min Typ Max Units
VIN
ISHDN
Input Voltage Range
Total Shutdown Current at IN
2.7
5.5
1.0
V
µA
VEN/SET = VENA = VENB = 0V
Charge Pump
1x Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load,
1.0
4.0
5.0
VENA = VENB = 0V
1.5x Mode, 3.0 ≤ VIN ≤ 5.5, Active, No
Load, VENA = VENB = 0V
IIN
Input Operating Current
mA
2x Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load,
VENA = VENB = 0V
DATA 1, 20mA Range
DATA 2, ADDRESS 4
DATA 1, 30mA Range
DATA 1, 15mA Range
VIN - VF = 1.5V, 20mA Range
18
0.9 1.0
20
22
1.1
IDX
Average Current Accuracy
mA
30
15
0.5
2
I(D-Match)
VTH
Current Matching
1
%
mV
MHz
˚C
1x to 1.5x or 1.5x to 2x Transition
Threshold at Any DX Pin
Clock Frequency
20mA Range
150
1
fCLK
Over-Temperature Shutdown
Threshold
TSD
140
Over-Temperature Shutdown
Hysteresis
THYS
15
˚C
EN/SET Logic Control
TEN/SET LO
TEN/SET_HI_MIN
TEN/SET_HI_MAX
TOFF
EN/SET Low Time
0.3
50
75
µs
ns
µs
µs
µs
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
75
500
500
TLAT
EN/SET Latch Timeout
EN/SET Logic Low Threshold
Voltage
VIL(EN/SET)
0.4
1
V
EN/SET Logic High Threshold
Voltage
VIH(EN/SET)
IEN/SET
1.4
-1
V
VEN/SET = VIN = 5V
EN/SET Input Leakage
µA
1. The AAT2847 is guaranteed to meet performance specifications over the –40˚C to +85°C operating temperature range 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
2847.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
