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
Enable/Set
V
BENS(L)
,
V
FENS(L)
V
BENS(H)
,
V
FENS(H)
I
BENS
, I
FENS
T
BENS(L)
,
T
FENS(L)
Description
Conditions
Min
Typ
Max
Units
BENS, FENS Low Threshold
BENS, FENS High Threshold
BENS, FENS Input Leakage
Current
BENS, FENS Low Time
V
BENS
or V
FENS
= V
IN
= 5V
1.4
-1
0.3
50
0.4
V
V
1
75
µA
µs
ns
T
BENS(H-MIN)
, BENS, FENS Minimum
T
FENS(H-MIN)
High Time
T
BENS(H-MAX)
, BENS, FENS Maximum
T
FENS(H-MAX)
High Time
T
BENS(OFF)
,
BENS, FENS Off Timeout
T
FENS(OFF)
T
BENS(LAT)
,
BENS, FENS Latch Timeout
T
FENS(LAT)
Linear Regulators
V
FBA
, V
FBB
FB Voltage Tolerance
I
IN
IN Operating Current
OUTA, OUTB Maximum Load
I
OUTA(MAX)
,
I
OUTB(MAX)
Current
V
OUTA(DO)
,
OUTA, OUTB Dropout Voltage
V
OUTB(DO)
ENL Enable Low Voltage
V
ENL(L)
Threshold
ENL Enable High Voltage
V
ENL(H)
Threshold
t
ENL(DLY)
ENL Enable Delay
R
OUTA(DCHG)
, OUTA, OUTB Auto-Discharge
R
OUTA(DCHG)
Resistance
PSRR
A
,
OUTA, OUTB Power Supply
Rejection Ratio
PSRR
B
75
500
500
µs
µs
µs
I
OUT
= 1mA to 200mA
ENL = IN, BENS = FENS = AGND
1.17
1.2
85
1.23
150
V
µA
mA
200
I
OUT
= 150mA
150
300
0.4
1.4
REF = Open
15
20
I
OUT
=10mA, C
REF
= 10nF, 1kHz
50
mV
V
V
µs
Ω
dB
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.
6
2842.2007.09.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
