PRODUCT DATASHEET
AAT2689
TM
SystemPower PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Electrical Characteristics1
VIN1 = 12.0V, VIN2 =3.3V; TA = -40°C to 85°C, unless noted otherwise. Typical values are at TA = 25°C.
Symbol
Description
Conditions
Min
Typ Max Units
Channel 1: Step-Down (Buck) Converter
VIN1
Input Voltage
6.0
24.0
5.0
V
V
VIN1 Rising
VUVLO1
UVLO Threshold
VIN1 Hysteresis
VIN1 Falling
300
mV
V
V
V
%
3.0
1.5
VOUT1
VFB1
VOUT1
Output Voltage Range
Feedback Pin Voltage
Output Voltage Accuracy
5.5
0.591 0.600 0.609
IOUT1 = 0 to 2.5A
-3.0
+3.0
(ΔVOUT1/VOUT1) /
ΔVIN1
(ΔVOUT1/VOUT1) /
ΔIOUT1
VIN1 = 6V to 24V, VOUT1 = 3.3V,
IOUT1 = 0V to 2.5A
VIN1 = 6V to 24V, VOUT1 = 3.3V,
IOUT1 = 0A to 2.5A
VEN1 = High, No load
VEN1 = Low, VL1 = 0V
Line Regulation
Load Regulation
0.014
%/V
%/A
0.1
0.6
IQ1
ISHDN1
VOCP1
ILX1
DMAX
TON(MIN)
RDSON(H)
FOSC1
Quiescent Current
Shutdown Current
mA
μA
mV
μA
%
ns
mΩ
kHz
kHz
ms
35.0
120
1.0
Over-Current Offset Voltage
LX Pin Leakage Current
Maximum Duty Cycle
Minimum On-Time
Hi Side On-Resistance
Oscillator Frequency
VEN1 = High, VIN1 = 6V to 24V, TA = 25°C
VIN1 = 24.0V, VEN1 = Low
80
-1.0
100
85
100
70
490
100
2.5
VIN1 = 6V to 24V
VL1 = 4.5V
350
2.7
650
FFOLDBACK1
TS1
Channel 2: 600mA Linear Low Dropout (LDO) Regulator
Short Circuit Foldback Frequency Current Limit Triggered
Start-Up Time From Enable Channel 1 to Output Regulation
VIN2
VDO2
IQ2
Input Voltage
Dropout Voltage
Quiescent (Ground) Current
Shutdown Current
5.5
1300
125
1.0
V
98% x VOUT2(NOM), IOUT2 = 600mA
No load
VEN2 = GND
1000
70
mV
μA
μA
ISHDN2
IOUT2 = 1 to 600mA, VIN2 = 2.7V to 5.5V,
TA = 25°C
IOUT2 = 1 to 600mA, VIN2 = 2.7V to 5.5V,
TA = -40°C to 85°C
-2.0
-3.5
+2.0
+3.5
%
VOUT2(TOL)
Output Voltage Tolerance
%
eN
Output Noise
BW = 300Hz to 50kHz
250
67
μVRMS
1kHz
PSRR
Power Supply Rejection Ratio
IOUT2 = 10mA
10kHz
1MHz
47
45
dB
ILIMIT2
TS2
Current Limit
Enable Start-Up Delay
700
800
15
mA
μs
From Enable Channel 2 to Output Regulation
Over-Temperature, EN Logic
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
135
15
°C
°C
TSD1,2
VEN1,EN2(L)
VEN1(H)
VEN2(H)
Enable Threshold Low
Enable Threshold High
Enable Threshold High
Input Low Current
0.6
1.0
V
V
V
2.5
1.4
-1.0
IEN1,EN2
μA
1. The AAT2689 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.
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2689.2008.06.1.0
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