PRODUCT DATASHEET
AAT2689
SystemPower
TM
PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Electrical Characteristics
1
V
IN1
= 12.0V, V
IN2
=3.3V; T
A
= -40°C to 85°C, unless noted otherwise. Typical values are at T
A
= 25°C.
Symbol
Description
Conditions
Min
6.0
V
IN1
Rising
V
IN1
Hysteresis
V
IN1
Falling
300
3.0
1.5
0.591
-3.0
5.5
0.609
+3.0
Typ
Max
24.0
5.0
Units
V
V
mV
V
V
V
%
%/V
%/A
Channel 1: Step-Down (Buck) Converter
V
IN1
Input Voltage
V
UVLO1
UVLO Threshold
Output Voltage Range
V
OUT1
V
FB1
Feedback Pin Voltage
V
OUT1
Output Voltage Accuracy
I
OUT1
= 0 to 2.5A
(ΔV
OUT1
/V
OUT1
) /
V
IN1
= 6V to 24V, V
OUT1
= 3.3V,
Line Regulation
ΔV
IN1
I
OUT1
= 0V to 2.5A
(ΔV
OUT1
/V
OUT1
) /
V
IN1
= 6V to 24V, V
OUT1
= 3.3V,
Load Regulation
ΔI
OUT1
I
OUT1
= 0A to 2.5A
I
Q1
Quiescent Current
V
EN1
= High, No load
Shutdown Current
V
EN1
= Low, V
L1
= 0V
I
SHDN1
V
OCP1
Over-Current Offset Voltage
V
EN1
= High, V
IN1
= 6V to 24V, T
A
= 25°C
I
LX1
LX Pin Leakage Current
V
IN1
= 24.0V, V
EN1
= Low
D
MAX
Maximum Duty Cycle
T
ON(MIN)
Minimum On-Time
V
IN1
= 6V to 24V
R
DSON(H)
Hi Side On-Resistance
V
L1
= 4.5V
F
OSC1
Oscillator Frequency
F
FOLDBACK1
Short Circuit Foldback Frequency Current Limit Triggered
T
S1
Start-Up Time
From Enable Channel 1 to Output Regulation
Channel 2: 600mA Linear Low Dropout (LDO) Regulator
V
IN2
Input Voltage
V
DO2
Dropout Voltage
98% x V
OUT2(NOM)
, I
OUT2
= 600mA
I
Q2
Quiescent (Ground) Current
No load
I
SHDN2
Shutdown Current
V
EN2
= GND
I
OUT2
= 1 to 600mA, V
IN2
= 2.7V to 5.5V,
T
A
= 25°C
V
OUT2(TOL)
Output Voltage Tolerance
I
OUT2
= 1 to 600mA, V
IN2
= 2.7V to 5.5V,
T
A
= -40°C to 85°C
Output Noise
BW = 300Hz to 50kHz
e
N
1kHz
PSRR
Power Supply Rejection Ratio
I
OUT2
= 10mA
10kHz
1MHz
I
LIMIT2
Current Limit
T
S2
Enable Start-Up Delay
From Enable Channel 2 to Output Regulation
Over-Temperature, EN Logic
Over-Temperature Shutdown
Threshold
T
SD1,2
Over-Temperature Shutdown
Hysteresis
V
EN1,EN2(L)
Enable Threshold Low
Enable Threshold High
V
EN1(H)
V
EN2(H)
Enable Threshold High
I
EN1,EN2
Input Low Current
0.600
0.014
0.1
0.6
80
-1.0
100
85
100
70
490
100
2.5
35.0
120
1.0
350
650
mA
μA
mV
μA
%
ns
mΩ
kHz
kHz
ms
V
mV
μA
μA
%
%
μV
RMS
dB
mA
μs
°C
°C
2.7
1000
70
-2.0
-3.5
250
67
47
45
800
15
135
15
5.5
1300
125
1.0
+2.0
+3.5
700
0.6
2.5
1.4
-1.0
1.0
V
V
V
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.
4
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