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DC/DC Converter. AAT1162 Datasheet

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DC/DC Converter. AAT1162 Datasheet
















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Part

AAT1162

Description

Step-Down DC/DC Converter



Feature


www.DataSheet4U.com AAT1162 12V, 1.5A S tep-Down DC/DC Converter General Descri ption The AAT1162 is an 800kHz high eff iciency stepdown DC/DC converter. With a wide input voltage range of 4.0V to 1 3.2V, the AAT1162 is an ideal choice fo r dual-cell Lithium-ion battery-powered devices and mid-power-range regulated 12V-powered industrial applications. Th e internal power s.
Manufacture

AAT

Datasheet
Download AAT1162 Datasheet


AAT AAT1162

AAT1162; witches are capable of delivering up to 1.5A to the load. The AAT1162 is a high ly integrated device, simplifying syste m-level design. Minimum external compon ents are required for the converter. Th e AAT1162 optimizes efficiency througho ut the entire load range. It operates i n a combination PWM/Light Load mode for improved light-load efficiency. The hi gh switching frequ.


AAT AAT1162

ency allows the use of small external co mponents. The low current shutdown feat ure disconnects the load from VIN and d rops shutdown current to less than 1µA . The AAT1162 is available in a Pb-free , space-saving, thermally-enhanced 16-p in TDFN34 packageand is rated over an o perating temperature range of -40°C to +85°C. Features • • • • • • • • • • • • • SwitchReg™ In.


AAT AAT1162

put Voltage Range: 4.0V to 13.2V Up to 1 .5A Load Current Fixed or Adjustable Ou tput: — Output Voltage: 0.6V to VIN L ow 115µA No-Load Operating Current Les s than 1µA Shutdown Current Up to 96% Efficiency Integrated Power Switches 80 0kHz Switching Frequency Soft Start Fun ction Short-Circuit and Over-Temperatur e Protection Minimum External Component s TDFN34-16 Package Te.




Part

AAT1162

Description

Step-Down DC/DC Converter



Feature


www.DataSheet4U.com AAT1162 12V, 1.5A S tep-Down DC/DC Converter General Descri ption The AAT1162 is an 800kHz high eff iciency stepdown DC/DC converter. With a wide input voltage range of 4.0V to 1 3.2V, the AAT1162 is an ideal choice fo r dual-cell Lithium-ion battery-powered devices and mid-power-range regulated 12V-powered industrial applications. Th e internal power s.
Manufacture

AAT

Datasheet
Download AAT1162 Datasheet




 AAT1162
www.DataSheet4U.com
AAT1162
12V, 1.5A Step-Down DC/DC Converter
General Description
Features
SwitchReg
The AAT1162 is an 800kHz high efficiency step-
down DC/DC converter. With a wide input voltage
range of 4.0V to 13.2V, the AAT1162 is an ideal
choice for dual-cell Lithium-ion battery-powered
devices and mid-power-range regulated 12V-pow-
ered industrial applications. The internal power
switches are capable of delivering up to 1.5A to the
load.
The AAT1162 is a highly integrated device, simpli-
fying system-level design. Minimum external com-
ponents are required for the converter.
The AAT1162 optimizes efficiency throughout the
entire load range. It operates in a combination
PWM/Light Load mode for improved light-load effi-
ciency. The high switching frequency allows the use
of small external components. The low current shut-
down feature disconnects the load from VIN and
drops shutdown current to less than 1µA.
The AAT1162 is available in a Pb-free, space-sav-
ing, thermally-enhanced 16-pin TDFN34 package-
and is rated over an operating temperature range
of -40°C to +85°C.
Typical Application
• Input Voltage Range: 4.0V to 13.2V
• Up to 1.5A Load Current
• Fixed or Adjustable Output:
— Output Voltage: 0.6V to VIN
• Low 115µA No-Load Operating Current
• Less than 1µA Shutdown Current
• Up to 96% Efficiency
• Integrated Power Switches
• 800kHz Switching Frequency
• Soft Start Function
• Short-Circuit and Over-Temperature Protection
• Minimum External Components
• TDFN34-16 Package
• Temperature Range: -40°C to +85°C
Applications
• Distributed Power Systems
• Industrial Applications
• Laptop Computers
• Portable DVD Players
• Portable Media Players
• Set-Top Boxes
• TFT LCD Monitors and HDTVs
Input:
4.0V ~ 13.2V
CIN
IN
EN
DGND
AIN AAT1162
LX
FB
COMP
LDO
PGND
AGND
L
2.2µH
Output:
0.6V min,
1.5A max
COUT
47µF
1162.2007.06.1.1
1




 AAT1162
www.DataSheet4U.com
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Pin Descriptions
Pin #
1, 2, EP2
3, 12
4, 5
6, 13,
14, EP1
7
8
9
10
11
15
16
Symbol
LX
N/C
IN
DGND
AIN
LDO
FB
COMP
AGND
EN
PGND
Function
Power switching node. LX is the drain of the internal P-channel switch and N-channel syn-
chronous rectifier. Connect the output inductor to the two LX pins and to EP2. A large
exposed copper pad under the package should be used for EP2.
Not connected.
Power source input. Connect IN to the input power source. Bypass IN to DGND with a
22µF or greater capacitor. Connect both IN pins together as close to the IC as possible. An
additional 100nF ceramic capacitor should also be connected between the two IN pins and
DGND, pin 6
Exposed Pad 1 Digital Ground, DGND. The exposed thermal pad (EP1) should be connected
to board ground plane and pins 6, 13, and 14. The ground plane should include a large
exposed copper pad under the package for thermal dissipation (see package outline).
Internal analog bias input. AIN supplies internal power to the AAT1162. Connect AIN to the
input source voltage and bypass to AGND with a 0.1µF or greater capacitor. For additional
noise rejection, connect to the input power source through a 10or lower value resistor.
Internal LDO bypass node. The output voltage of the internal LDO is bypassed at LDO. The
internal circuitry of the AAT1162 is powered from LDO. Do not draw external power from LDO.
Bypass LDO to AGND with a 1µF or greater capacitor.
Output voltage feedback input. FB senses the output voltage for regulation control. For fixed
output versions, connect FB to the output voltage. For adjustable versions, drive FB from the
output voltage through a resistive voltage divider. The FB regulation threshold is 0.6V.
Control compensation node. Connect a series RC network from COMP to AGND, R = 51k
and C = 270pF.
Analog signal ground. Connect AGND to PGND at a single point as close to the IC as possible.
Active high enable input. Drive EN high to turn on the AAT1162; drive it low to turn it off. For
automatic startup, connect EN to IN through a 4.7kresistor. EN must be biased high, biased
low, or driven to a logic level by an external source. Do not let the EN pin float when the
device is powered.
Power ground. Connect AGND to PGND at a single point as close to the IC as possible.
Pin Configuration
TDFN34-16
(Top View)
LX
LX
N/C
IN
IN
DGND
AIN
LDO
1
2
3
4
5
6
7
8
EP2
EP1
16 PGND
15 EN
14 DGND
13 DGND
12 N/C
11 AGND
10 COMP
9 FB
2 1162.2007.06.1.1




 AAT1162
www.DataSheet4U.com
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Absolute Maximum Ratings1
Symbol
VIN, VAIN
VLX
VFB
VEN
TJ
Description
Input Voltage
LX to GND Voltage
FB to GND Voltage
EN to GND Voltage
Operating Junction Temperature Range
Value
-0.3 to 14
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-40 to 150
Units
V
V
V
V
°C
Thermal Information3
Symbol
PD
θJA
Description
Maximum Power Dissipation4
Thermal Resistance
Value
2.7
37
Units
W
°C/W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent 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. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 2.7mW/°C above 25°C.
1162.2007.06.1.1
3




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