Step-Down Converter. AAT2158 Datasheet

AAT2158 Converter. Datasheet pdf. Equivalent


Advanced Analogic Technologies AAT2158
SwitchRegTM
www.DataSheet4U.com
General Description
The AAT2158 SwitchReg is a 1.5A step-down converter
with an input voltage range of 2.4V to 5.5V and an
adjustable output voltage from 0.6V to VIN. The 1.4MHz
switching frequency enables the use of small external
components. The small footprint and high efficiency make
the AAT2158 an ideal choice for portable applications.
The AAT2158 delivers 1.5A maximum output current
while consuming only 42µA of no-load quiescent current.
Ultra-low RDS(ON) integrated MOSFETs and 100% duty
cycle operation make the AAT2158 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT2158 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT2158 maintains high efficiency throughout the
load range. The AAT2158’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2158 and sys-
tem components from damage.
The AAT2158 is available in a Pb-free, space-saving
16-pin 3x3mm QFN package. The product is rated over
an operating temperature range of -40°C to +85°C.
PRODUCT DATASHEET
AAT2158
1.5A Low Noise Step-Down Converter
Features
• 1.5A Maximum Output Current
• Input Voltage: 2.4V to 5.5V
• Output Voltage: 0.6V to VIN
• Up to 95% Efficiency
• Low Noise Light Load Mode
• 42µA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1µA Shutdown Current
• 16-Pin 3x3mm QFN Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
3.3V
C1
10µF
U1
AAT2158
12 VP
FB 4
11 VP
LX 15
10 VP
LX 14
7 EN
LX 13
9 VCC
N/C 16
6 N/C PGND 3
8 N/C PGND 2
5 SGND PGND 1
L1
2.2µH
2.5V
R3
187k
R4
59k
C3
22µF
2158.2008.10.1.5
www.analogictech.com
1


AAT2158 Datasheet
Recommendation AAT2158 Datasheet
Part AAT2158
Description 1.5A Low Noise Step-Down Converter
Feature AAT2158; PRODUCT DATASHEET AAT2158 TM SwitchReg www.DataSheet4U.com 1.5A Low Noise Step-Down Converter Fea.
Manufacture Advanced Analogic Technologies
Datasheet
Download AAT2158 Datasheet




Advanced Analogic Technologies AAT2158
PRODUCT DATASHEET
AAT2158
SwitchRegTM
www.DataSheet4U.com
Pin Descriptions
1.5A Low Noise Step-Down Converter
Pin #
1, 2, 3
4
5
6, 8, 16
7
9
10, 11, 12
13, 14, 15
EP
Symbol
PGND
FB
SGND
N/C
EN
VCC
VP
LX
Function
Main power ground return pin. Connect to the output and input capacitor return. (See board layout rules.)
Feedback input pin. For an adjustable output, connect an external resistive divider to this pin. For fixed
output voltage versions, FB is the output pin of the converter.
Signal ground. Connect the return of all small signal components to this pin. (See board layout rules.)
Not internally connected.
Enable input pin. A logic high enables the converter; a logic low forces the AAT1158 into shutdown mode
reducing the supply current to less than 1µA. The pin should not be left floating.
Bias supply. Supplies power for the internal circuitry. Connect to input power.
Input supply voltage for the converter power stage. Must be closely decoupled to PGND.
Connect inductor to these pins. Switching node internally connected to the drain of both high- and low-side
MOSFETs.
Exposed paddle (bottom); connect to PGND directly beneath package.
Pin Configuration
QFN33-16
(Top View)
PGND 1
PGND 2
PGND 3
FB 4
12 VP
11 VP
10 VP
9 VCC
2
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2158.2008.10.1.5



Advanced Analogic Technologies AAT2158
Gill Sans MT Bold Italic
15/18, convert to outlines
SwitchRegTM
www.DataSheet4U.com
Absolute Maximum Ratings1
Symbol
VCC, VP
VLX
VFB
VEN
TJ
Description
VCC, VP to GND
LX to GND
FB to GND
EN to GND
Operating Junction Temperature Range
Thermal Characteristics
Symbol
qJA
qJC
PD
Description
Maximum Thermal Resistance
Maximum Thermal Resistance
Maximum Power Dissipation (TA = 25°C)2, 3
Recommended Operating Conditions
Symbol
TA
Description
Ambient Temperature Range
PRODUCT DATASHEET
AAT2158
1.5A Low Noise Step-Down Converter
Value
6
-0.3 to VP + 0.3
-0.3 to VCC + 0.3
-0.3 to -6
-40 to150
Units
V
V
V
V
°C
Value
50
4.2
2.0
Units
°C/W
°C/W
W
Value
-40 to 85
Units
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause damage to the device. Functional operation at conditions other than the operating conditions specified is
not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a demo board (FR4, in still air). Exposed pad must be mounted to PCB.
3. Derate 20mW/°C above 25°C.
2158.2008.10.1.5
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