PRODUCT DATASHEET
AAT2846
ChargePumpTM High Current Charge Pump with Dual LDO for Backlight and Flash Applications
Electrical Characteristics1
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
1.5X Mode, 3.0V ≤ VIN ≤ 5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
IIN(Q)
IN Operating Current
4
mA
2X Mode, 3.0V ≤ VIN ≤ 5.5V, Active,
No Load; ENL = AGND, FEN = ENS = IN
5
IIN(SHDN)
TSD
TSD(HYS)
IN Shutdown Current
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
ENA = ENB = ENS = FEN = AGND
1.0
µA
°C
°C
140
15
Charge Pump Section
IOUT
VIN(TH_H)
fOSC
OUT Maximum Output Current
Charge Pump Mode Hysteresis
Charge Pump Oscillator Frequency
600
500
2
mA
mV
MHz
Address 0, Data 1
TA = 25°C
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)
BL1-BL6 Maximum Current
BL1-BL6 Current Matching2
mA
%
∆I(BL_)
1.0
BL1-BL6 Charge Pump Mode Transition
Threshold
FL1-FL2 Flash LED Outputs
150
300
300
mV
IFL_(MAX)
∆I(FL_)
FL1-FL2 Maximum Current
FL1-FL2 Current Matching2
FL1-FL2 Charge Pump Mode Transition
Threshold
Address 4, Data 1; VIN - VF = 1.5V
Address 4, Data 1; VIN - VF = 1.5V
270
330
4.0
mA
%
VFL_(TH)
mV
ENS, FEN Logic Control
VENS(L)
VENS(H)
ENS, IFEN
ENS, FEN Input Low Threshold
0.4
V
V
µA
µs
ENS, FEN Input High Threshold
ENS, FEN Input Leakage Current
ENS, FEN Serial Interface Low Time
1.4
-1.0
0.3
I
VENS or VFEN = VIN = 5V
VIN ≥ 3.3V
1.0
75
tENS(LOW)
tENS(HI_MIN)
,
ENS, FEN Serial Interface Minimum High Time
50
ns
µs
µs
µs
tENS(HI_MIN)
tENS(HI_MAX)
tENS(HI_MAX)
tENS(OFF)
tFEN(OFF)
tENS(LAT)
tFEN(LAT)
,
ENS, FEN Serial Interface Maximum High Time VIN ≥ 3.3V
ENS, FEN Off Timeout
75
,
500
500
,
ENS, FEN Serial Interface Latch Timeout
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 correla-
tion with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
w w w . a n a l o g i c t e c h . c o m
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2846.2008.03.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
