AAT2842
High-Current Charge Pump with S
2
Cwire™
Control and Dual LDO for Backlight and Flash
Electrical Characteristics
1
V
IN
= 3.6V; C
IN
= 4.7µF; C
OUT
= 2.2µF; C
1
= C
2
= 1.0µF; R
BSET
= R
FSET
= 280kΩ; T
A
= -40°C to +85°C, unless
otherwise noted. Typical values are at T
A
= 25°C.
Symbol
V
IN
Description
IN Operating Voltage Range
Conditions
1X Mode, 3.0V
≤
V
IN
≤
5.5V, Active, No
Load; ENL = AGND, FENS = BENS = IN
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
R
BSET
= 280kΩ, Data 1, 1X Mode
ENL = BENS = FENS = AGND, T
A
= 25°C
Min
2.7
Typ Max Units
5.5
1.0
3.0
5.0
50
5.0
140
15
µA
µA
°C
°C
mA
V
I
IN(Q)
IN Operating Current
IN Shutdown Current
Over-Temperature Shutdown
T
SD
Threshold
Over-Temperature Shutdown
T
SD(HYS)
Hysteresis
Charge Pump Section
I
OUT
OUT Maximum Output Current
V
IN(TH_H)
Charge Pump Mode Hysteresis
f
OSC
Charge Pump Oscillator
Frequency
t
SS
Charge Pump Soft-Start Delay
Backlight LED Outputs, S
2
Cwire Data = 1
I
BL_(MAX)
BL1-BL4 Maximum Current
ΔI
(BL_)
BL1-BL4 Current Matching
2
BL1-BL4 Charge Pump Mode
V
BL_(TH)
Transition Threshold
V
BSET
R
BSET
Pin Voltage
Backlight LED Outputs, S
2
Cwire Data = 7
I
BL_(MAX)
BL1-BL4 Maximum Current
ΔI
(BL_)
BL1-BL4 Current Matching
2
BL1-BL4 Charge Pump Mode
V
BL_(TH)
Transition Threshold
Flash LED Outputs, S
2
Cwire Data = 1
I
FL_(MAX)
FL1-FL4 Maximum Current
ΔI
(FL_)
FL1-FL4 Current Matching
2
FL1-FL4 Charge Pump Mode
V
FL_(TH)
Transition Threshold
V
FSET
R
FSET
Pin Voltage
I
IN(SHDN)
Data 1
600
350
2
mA
mV
MHz
µs
33
1
mA
%
mV
V
10.6
2
mA
%
mV
OUT = 0V to V
BAT
V
IN
- V
F
= 1.5V
V
IN
- V
F
= 1.5V
27
350
30
0.5
150
0.7
V
IN
- V
F
= 1.5V
V
IN
- V
F
= 1.5V
8.6
9.6
60
V
IN
- V
F
= 1.5V
V
IN
- V
F
= 1.5V
135
150
1
300
0.7
165
4
mA
%
mV
V
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.
2842.2007.09.1.2
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
