AAT2848 Datasheet, PDF (4/19 Pages) Advanced Analogic Technologies – High-Current Charge Pump For Backlight Display and Flash Applications

ChargePump^TM
PRODUCT DATASHEET
AAT2848
High-Current Charge Pump For Backlight Display and Flash Applications
Electrical Characteristics¹
V_IN = 3.6V; C_IN = 4.7μF; C_OUT = 2.2μF; C1 = C2 = 1μF; R_BSET = 15kΩ; R_FSET = 14.3kΩ; C_FLTMR = 0.33μF; C_FADE = 47nF;
T_A = -40°C to +85°C, unless otherwise noted. Typical values are T_A = 25°C.
Symbol Description
V_IN
IN Operating Voltage Range
I_IN(Q)
IN Operating Current
I_IN(SHDN) IN Shutdown Current
T_SD
T_SD(HYS)
Thermal Shutdown
Thermal Shutdown Hysteresis
Charge Pump Section
I_OUT(MAX) CP Maximum Output Current
V_{IN(TH_H)}
Charge Pump Mode Transition
Hysteresis
f_OSC
Charge Pump Oscillator
Frequency (1.5X mode)
t_SS
Charge Pump Soft Start Time
BL1-BL4 Backlight LED Outputs
I_{BL_(MAX)} BL1-BL4 Current Accuracy
ΔI_{(BL_)}
V_{BL_(TH)}
BL1-BL4 Current Matching
BL1-BL4 Charge Pump Mode
Transition Threshold
FL1-FL2 Flash LED Outputs
I_{FL_(MAX)}
ΔI_{(FL_)}
V_{FL_(TH)}
FL1-FL2 Current Accuracy
FL1-FL2 Current Matching
FL1-FL2 Charge Pump Mode
Transition Threshold
Conditions
BENS = IN, FENS = AGND, BL1 = BL2 = BL3 = BL4 = OUT
(Excluding LED Current)
BENS = IN, FENS = AGND, BL1 = BL2 = BL3 = BL4 = OPEN
(1.5x CP, no load)
BENS = AGND, FENS = IN, FL1 = FL2 = OUT
(Excluding LED Current)
BENS = AGND, FENS = IN, FL1 = FL2 = OPEN
(2x CP, no load)
BENS = FENS = AGND
IN = 3V
BENS = DATA1
T_A = 25°C
BENS = DATA1; V_IN – V_F = 1.5V
BENS = DATA32; V_IN – V_F = 1.5V
BENS = DATA1; V_IN – V_F = 1.5V
Any backlight current sink/channel BL1, BL2, BL3, BL4
FENS = DATA1; V_IN – V_F = 1.5V
FENS = DATA16; V_IN – V_F = 1.5V
FENS = DATA1; V_IN – V_F = 1.5V
Any flash current sink/channel FL1, FL2
Min
2.7
720
18
0.26
180
5.66
Typ
140
15
100
1.0
100
20
0.32
±3
120
200
6.66
±3
300
Max
5.5
600
5.5
600
5.5
1.0
22
0.39
220
7.66
Units
V
μA
mA
μA
mA
μA
°C
°C
mA
mV
MHz
μs
mA
%
mV
mA
%
mV
4
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2848.2008.05.1.0