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| AAT2789 Datasheet, PDF (4/22 Pages) Advanced Analogic Technologies – Low Noise, High Frequency Dual Step-Down Converter | |||
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SystemPowerTM
PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Electrical Characteristics1
VIN = 3.6V, TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C.
Symbol Description
Channel 1: 1700mA Step-Down Converter
VP1, VCC1 Input Voltage
VUVLO1
UVLO Threshold
VOUT1
Output Voltage Range
VOUT1(TOL) Output Voltage Tolerance
IQ1
Quiescent Current
ISHDN1
Shutdown Current
ILIM1
Current Limit
RDSON(H)1 High Side On-Resistance
RDSON(L)1
Low Side On-Resistance
ÎVLOADREG1 Load Regulation
ÎVLINEREG1 /
ÎVP1
Line Regulation
FOSC1
Oscillator Frequency
TS1
Start-Up Time
Channel 2: 800mA Step-Down Converter
VP2, VCC2 Input Voltage
VUVLO2
UVLO Threshold
VOUT2
Output Voltage Range
VOUT2(TOL) Output Voltage Tolerance
IQ2
Quiescent Current
ISHDN2
Shutdown Current
ILIM2
Current Limit
RDSON(H)2 High Side On-Resistance
RDSON(L)2
Low Side On-Resistance
ÎVLOADREG2 Load Regulation
ÎVLINEREG2 /
ÎVP2
Line Regulation
FOSC2
Oscillator Frequency
TS2
Start-Up Time
Over-Temperature, EN Logic
TSD1,2
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
VEN1,2(L)
VEN1,2(H)
IEN(1,2
Enable Threshold Low
Enable Threshold High
Input Low Current
Conditions
Min Typ Max Units
VP1 Rising
VP1 Hysteresis
VP1 Falling
IOUT1 = 0A to 1.7A; VP1 = 2.7V to 5.5V
No load, VEN1 = VP1, VEN2 = AGND
VEN1 = GND
IOUT1 = 0A to 1.7A
VP1 = 2.7V to 5.5V
From Enable-1 to Output-1 Regulation
2.7
1.7
0.6
-3.0
1800
1.12
250
42
120
85
0.5
0.2
1.40
150
5.5
2.4
VP1
3.0
90
1.0
1.68
V
V
mV
V
V
%
μA
μA
mA
mΩ
mΩ
%
%/V
MHz
μs
2.7
5.5
V
VP2 Rising
2.7
V
VP2 Hysteresis
100
mV
VP2 Falling
1.7
V
0.6
VP2
V
IOUT2 = 0A to 800mA, VP2 = 2.7V to 5.5V -3.0
3.0
%
No load, VEN2 = VP2, VEN1 = AGND
37
70
μA
VEN2 = GND
1.0
μA
900
mA
330
mΩ
275
mΩ
IOUT2= 0mA to 800mA
0.5
%
VP2 = 2.7V to 5.5V
0.1
%/V
From Enable-2 to Output-2 Regulation
0.9 2.0 2.6 MHz
150
μs
140
°C
15
°C
0.6
V
1.4
V
-1.0
1.0
μA
1. The AAT2789 is guaranteed to meet performance specifications over the â40°C to +85°C operating temperature range, and is assured by design, characterization and correla-
tion with statistical process controls.
4
www.analogictech.com
2789.2008.03.1.0
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