AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
1, 2
Electrical Characteristics
VIN = 3.6V; CIN = 4.7µF; COUT = 2.2µF; C1 = C2 = 1µF; RFSET = 280kΩ; TA = -40°C to +85°C, unless otherwise
noted. Typical values are TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
VIN
IN Operating Voltage Range
2.7
5.5
V
1X Mode, 3.0V ≤ VIN ≤ 5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
1.5X Mode, 3.0V ≤ VIN ≤ 5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
2X Mode, 3.0V ≤ VIN ≤ 5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
ENA = ENB = ENS = FEN = AGND
1
IIN(Q)
IN Operating Current
4
mA
5
IIN(SHDN)
TSD
IN Shutdown Current
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
1.0
µA
°C
140
15
TSD(HYS)
°C
Charge Pump Section
IOUT
VIN(TH_H)
OUT Maximum Output Current
600
500
mA
mV
Charge Pump Mode Hysteresis
Charge Pump Oscillator
Frequency
Address 0, Data 1
TA = 25°C
fOSC
2
MHz
BL1-BL6 Backlight LED Outputs
Address 0, Data 1; VIN - VF = 1.5V
Address 12, Data 2; VIN - VF = 1.5V
Address 0, Data 1; VIN - VF = 1.5V
18
20
30
22
IBL_(MAX)
ΔI(BL_)
BL1-BL6 Maximum Current
mA
%
2
BL1-BL6 Current Matching
1.0
BL1-BL6 Charge Pump Mode
Transition Threshold
FL1-FL2 Flash LED Outputs
VBL_(TH)
150
300
300
mV
IFL_(MAX)
ΔI(FL_)
FL1-FL2 Maximum Current
Address 4, Data 1; VIN - VF = 1.5V
Address 4, Data 1; VIN - VF = 1.5V
270
330
4.0
mA
%
2
FL1-FL2 Current Matching
FL1-FL2 Charge Pump Mode
Transition Threshold
VFL_(TH)
mV
ENS, FEN Logic Control
VENS(L)
VENS(H)
ENS, FEN Input Low Threshold
ENS, FEN Input High Threshold
0.4
V
V
1.4
IENS, IFEN ENS, FEN Input Leakage Current VENS or VFEN = VIN = 5V
ENS, FEN Serial Interface
-1.0
1.0
75
µA
tENS(LOW)
VIN ≥ 3.3V
0.3
µs
ns
µs
Low Time
tENS(HI_MIN)
,
ENS, FEN Serial Interface
50
tENS(HI_MIN) Minimum High Time
t
ENS(HI_MAX), ENS, FEN Serial Interface
tENS(HI_MAX) Maximum High Time
VIN ≥ 3.3V
75
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 ]
