AAT2845A Datasheet, PDF (4/19 Pages) Advanced Analogic Technologies – Four-Channel Backlight Driver with Dual LDOs

AAT2845A
Four-Channel Backlight Driver with Dual LDOs
Electrical Characteristics¹
C_IN = C_O1 = C_O2 = 2.2µF, C₁ = C₂ = 1.0µF, C_BP = 0.1µF; T_A = 25°C, unless otherwise noted. Typical values are
at T_A = 25°C and V_IN = 3.6V.
Symbol Description
Power Supply
V_IN
I_SHDN
Charge Pump
Supply Voltage
Total Shutdown Current at VIN
and LDOIN
I_CC
Operating Current
I_DX
Average Current Accuracy
I_(D-Match)
V_TH
Current Matching²
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any DX Pin
T_SS
F_CLK
T_SD
Soft-Start Time
Clock Frequency
Over-Temperature Shutdown
Threshold
T_HYS
Over-Temperature Shutdown
Hysteresis
EN/SET Logic Control
T_{EN/SET LO}
T_{EN/SET HI MIN}
T_{EN/SET HI MAX}
T_OFF
T_LAT
I_EN/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 ≤ 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
20mA Setting, T_A = 25°C
V_EN/SET = V_IN = 5V
Min Typ Max Units
2.7
5.5 V
1.0 µA
1.0
3.0 mA
5.0
50
µA
18 20 22
mA
0.9 1.0 1.1
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 AAT2845A 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
2845A.2007.05.1.0