AAT2856_08 Datasheet, PDF (4/18 Pages) Advanced Analogic Technologies – High Current Charge Pump with Dual LDO for Backlight Applications

PRODUCT DATASHEET
AAT2856
ChargePump^TM High Current Charge Pump with Dual LDO for Backlight Applications
Electrical Characteristics¹
V_IN = 3.6V; C_IN = 4.7μF; C_OUT = 2.2μF; C₁ = C₂ = 1μF; T_A = -40°C to +85°C, unless otherwise noted. Typical values are
T_A = 25°C.
Symbol Description
V_IN
IN Operating Voltage Range
I_IN(Q)
IN Operating Current
I_IN(SHDN) IN Shutdown Current
T_SD
Over-Temperature Shutdown Threshold
T_SD(HYS) Over-Temperature Shutdown Hysteresis
Charge Pump Section
I_OUT
V_{IN(TH_H)}
OUT Maximum Output Current
Charge Pump Mode Hysteresis
f_OSC
Charge Pump Oscillator Frequency
BL1-BL6 Backlight LED Outputs
I_{BL_(MAX)} BL1-BL6 Maximum Current
ΔI_{(BL_)}
V_{BL_(TH)}
BL1-BL6 Current Matching²
BL1-BL6 Charge Pump Mode Transition Threshold
ENS Logic Control
V_ENS(L) ENS Input Low Threshold
V_ENS(H)
I_ENS
ENS Input High Threshold
ENS Input Leakage Current
t_ENS(LOW)
t , _{ENS(HI_MIN)}
t_{ENS(HI_MIN)}
ENS Serial Interface Low Time
ENS Serial Interface Minimum High Time
t , _{ENS(HI_MAX)}
t_{ENS(HI_MAX)}
ENS Serial Interface Maximum High Time
t_ENS(OFF) ENS Off Timeout
t_ENS(LAT) ENS Serial Interface Latch Timeout
Linear Regulators
V_FBA, V_FBB Output Voltage Tolerance
I_IN
I_OUTA(MAX),
I_OUTB(MAX)
V_OUTA(DO),
V_OUTB(DO)
PSRR_A,
PSRR_B
V_{EN_(L)}
V_{EN_(H)}
t_{EN_(DLY)}
Ground Pin Current
OUTA, OUTB Maximum Load Current
OUTA, OUTB Dropout Voltage
OUTA, OUTB Power Supply Rejection Ratio
ENA, ENB Voltage Low Threshold
ENA, ENB Voltage High Threshold
ENA, ENB Enable Delay
Conditions
1X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active,
No Load; ENL = AGND, ENS = IN
1.5X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active,
No Load; ENL = AGND, ENS = IN
2X Mode, 3.0V ≤ V_IN ≤ 5.5V, Active,
No Load; ENL = AGND, ENS = IN
ENA = ENB = ENS = AGND
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
V_ENS = V_IN = 5V
V_IN ≥ 3.3V
V_IN ≥ 3.3V
I_OUT = 1mA to 200mA
ENA = ENB = IN, ENS = AGND
ENA = IN, ENB = AGND or ENA =
AGND, ENB = IN, ENS = AGND
I_OUT = 150mA
I_OUT = 10mA, C_REF = 10nF, 1kHz
REF = Open
Min Typ Max Units
2.7
5.5
V
0.63 1
1.4 4
mA
2.6 5
1.0
μA
140
°C
15
°C
200
mA
500
mV
2
MHz
18 20 22
mA
30
1.0
%
150
mV
1.4
-1.0
0.3
0.4
V
V
1.0
μA
75
μs
50
ns
75
μs
500
μs
500
μs
1.17 1.2 1.23
V
125 200
90 150 μA
200
mA
150 300 mV
50
dB
0.4
V
1.4
V
15
μs
1. The AAT2856 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.
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2856.2008.02.1.3