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| AAT2687 Datasheet, PDF (4/20 Pages) Advanced Analogic Technologies – PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters | |||
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DATA SHEET
AAT2687
PMIC Solution for 24V Systems
with 2 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
Channel 1: Step-Down Converter
VIN1
Input Voltage
VIN1 Rising
VUVLO1
UVLO Threshold
VIN1 Hysteresis
VIN1 Falling
VOUT1
Output Voltage Range
VFB1
Feedback Pin Voltage
TA = 25°C
VOUT
ïVOUT/VOUT
ïVIN
ïVOUT/VOUT
ïIOUT
Output Voltage Accuracy
Line Regulation
Load Regulation
IOUT1 = 0A to 4.5A
VIN1 = 6V to 24V, VOUT1 = 3.3V, IOUT1 = 4.5A
VIN1 = 12V, VOUT1 = 3.3V, IOUT1 = 0A to 4.5A
IQ1
Quiescent Current
VEN1 = High, No load
ISHDN1
Shutdown Current
VEN1 = Low, VL1 = 0V
VOCP1
Over-Current Offset Voltage
VEN1 = High, VIN1 = 6.0V to 24.0V, TA = 25°C
ILX1
LX Pin Leakage Current
VIN1 = 24.0V, VEN1 = Low
DMAX
Maximum Duty Cycle
TON(MIN) Minimum On-Time
VIN1 = 6.0 to 24.0V
RDSON(H) High Side On-Resistance
VL1 = 4.5V
FOSC1
Oscillator Frequency
FFOLDBACK1 Short Circuit Foldback Frequency Current Limit Triggered
TS1
Start-Up Time
From Enable Channel 1 to Output Regulation
Channel 2: 600mA Linear Low Dropout (LDO) Regulator
VIN2
Input Voltage
VDO2
Dropout Voltage
98% x VOUT2(NOM), IOUT2 = 600mA
IQ2
Quiescent (Ground) Current
No load
ISHDN2
Shutdown Current
VEN2 = GND
VOUT2(TOL) Output Voltage Tolerance
IOUT2 = 1mA to 600mA, VIN2 = 2.7V to 5.5V,
TA = 25°C
IOUT2 = 1mA to 600mA, VIN2 = 2.7V to 5.5V,
TA = -40°C to 85°C
eN
Output Noise
BW = 300Hz to 50kHz
1kHz
PSRR Power Supply Rejection Ratio
IOUT2 = 10mA
10kHz
1MHz
ILIMIT2
TS2
Current Limit
Enable Start-Up Delay
From Enable Channel 2 to Output Regulation
Over-Temperature, EN Logic
TSD1,2
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
VEN1,EN2(L) Enable Threshold Low
VEN1(H)
VEN2(H)
Enable Threshold High
Enable Threshold High
IEN1,EN2
Input Low Current
Min Typ Max Units
6.0
3.0
1.5
0.591
-2.5
300
0.600
24.0
5.0
5.5
0.609
2.5
0.06
V
V
mV
V
V
V
%
%/V
80
-1.0
350
0.18
0.6
100
85
100
35
490
100
2.5
35.0
120
1.0
650
%/A
mA
μA
mV
μA
%
ns
mΩ
kHz
kHz
ms
2.7
5.5
V
1000 1300 mV
70 125
μA
1.0
μA
-2.0
+2.0 %
-3.5
700
250
67
47
45
800
15
+3.5
%
μVRMS
dB
mA
μs
135
°C
15
°C
2.5
1.4
-1.0
0.6
V
V
V
1.0
μA
1. The AAT2687 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.
Skyworks Solutions, Inc. ⢠Phone [781] 376-3000 ⢠Fax [781] 376-3100 ⢠sales@skyworksinc.com ⢠www.skyworksinc.com
4
202033A ⢠Skyworks Proprietary Information ⢠Products and Product Information are Subject to Change Without Notice. ⢠June 8, 2012
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