AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
Electrical Characteristics
1, 2
V
IN
= 3.6V; C
IN
= 4.7µF; C
OUT
= 2.2µF; C
1
= C
2
= 1µF; R
FSET
= 280kΩ; T
A
= -40°C to +85°C, unless otherwise
noted. Typical values are 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, FEN = ENS = IN
1.5X Mode, 3.0V
≤
V
IN
≤
5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
2X Mode, 3.0V
≤
V
IN
≤
5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
ENA = ENB = ENS = FEN = AGND
Min
2.7
Typ
Max Units
5.5
1
4
5
1.0
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
Charge Pump Oscillator
f
OSC
Frequency
BL1-BL6 Backlight LED Outputs
I
BL_(MAX)
ΔI
(BL_)
BL1-BL6 Maximum Current
I
IN(SHDN)
140
15
Address 0, Data 1
T
A
= 25°C
Address 0, Data 1; V
IN
- V
F
= 1.5V
Address 12, Data 2; V
IN
- V
F
= 1.5V
Address 0, Data 1; V
IN
- V
F
= 1.5V
18
600
500
2
mA
mV
MHz
20
30
22
1.0
mA
%
mV
BL1-BL6 Current Matching
2
BL1-BL6 Charge Pump Mode
V
BL_(TH)
Transition Threshold
FL1-FL2 Flash LED Outputs
I
FL_(MAX)
FL1-FL2 Maximum Current
ΔI
(FL_)
FL1-FL2 Current Matching
2
FL1-FL2 Charge Pump Mode
V
FL_(TH)
Transition Threshold
ENS, FEN Logic Control
V
ENS(L)
ENS, FEN Input Low Threshold
V
ENS(H)
ENS, FEN Input High Threshold
I
ENS
, I
FEN
ENS, FEN Input Leakage Current
ENS, FEN Serial Interface
t
ENS(LOW)
Low Time
t
ENS(HI_MIN)
, ENS, FEN Serial Interface
t
ENS(HI_MIN)
Minimum High Time
t
ENS(HI_MAX)
, ENS, FEN Serial Interface
t
ENS(HI_MAX)
Maximum High Time
150
Address 4, Data 1; V
IN
- V
F
= 1.5V
Address 4, Data 1; V
IN
- V
F
= 1.5V
270
300
330
4.0
mA
%
mV
300
0.4
V
ENS
or V
FEN
= V
IN
= 5V
V
IN
≥
3.3V
1.4
-1.0
0.3
50
V
IN
≥
3.3V
75
1.0
75
V
V
µA
µs
ns
µs
1. The AAT2846 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.
2846.2007.08.1.0
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
