AAT2842 Datasheet, PDF (5/21 Pages) Advanced Analogic Technologies – High-Current Charge Pump with S2Cwire™ Control and Dual LDO for Backlight and Flash

AAT2842
High-Current Charge Pump with S²Cwire™
Control and Dual LDO for Backlight and Flash
Electrical Characteristics¹
V_IN = 3.6V; C_IN = 4.7µF; C_OUT = 2.2µF; C₁ = C₂ = 1.0µF; T_A = -40°C to +85°C, unless otherwise noted. Typical
values are at T_A = 25°C.
Symbol Description
Conditions
Min Typ Max Units
V_IN
IN Operating Voltage Range
2.7
1X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active, No
Load; ENL = AGND, FENS = BENS = IN
5.5 V
1.0
I_IN(Q)
IN Operating Current
1.5X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active, No
Load; ENL = AGND, FENS = BENS = IN
2X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active, No
Load; ENL = AGND, FENS = BENS = IN
3.0 mA
5.0
I_IN(SHDN)
T_SD
IN Shutdown Current
Over-Temperature Shutdown
Threshold
R_BSET = 280kΩ, Data 1, 1X Mode
ENL = BENS = FENS = AGND, T_A = 25°C
50
µA
5.0 µA
140
°C
T_SD(HYS)
Over-Temperature Shutdown
Hysteresis
15
°C
Charge Pump Section
I_OUT
V_{IN(TH_H)}
OUT Maximum Output Current
BL1-BL4, FL1-FL4 Charge Pump R_BSET = 280kΩ, Data 1
Mode Transition Hysteresis
600
mA
500
mV
f_OSC
Charge Pump Oscillator
Frequency
2
MHz
Backlight LED Outputs, S²Cwire Data = 1
I_{BL_(MAX)}
ΔI_{(BL_)}
V_{BL_(TH)}
BL1-BL4 Maximum Current
BL1-BL4 Current Matching²
BL1-BL4 Charge Pump Mode
Transition Threshold
R_BSET = 280kΩ, V_IN - V_F = 1.5V
V_IN - V_F = 1.5V
27 30 33 mA
0.5 1
%
150
mV
Backlight LED Outputs, S²Cwire Data = 7
I_{BL_(MAX)}
ΔI_{(BL_)}
V_{BL_(TH)}
BL1-BL4 Maximum Current
BL1-BL4 Current Matching²
BL1-BL4 Charge Pump Mode
Transition Threshold
R_BSET = 280kΩ, V_IN - V_F = 1.5V
V_IN - V_F = 1.5V
8.6 9.6 10.6 mA
2
%
60
mV
Flash LED Outputs, S²Cwire Data = 1
I_{FL_(MAX)}
ΔI_{(FL_)}
V_{FL_(TH)}
FL1-FL4 Maximum Current
FL1-FL4 Current Matching²
FL1-FL4 Charge Pump Mode
Transition Threshold
R_FSET = 280kΩ, V_IN - V_F = 1.5V
V_IN - V_F = 1.5V
135 150 165 mA
1
4
%
300
mV
1. The AAT2842 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.
2842.2006.10.1.0
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