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PDF APW7322A Data sheet ( Hoja de datos )
| Número de pieza | APW7322A | |
| Descripción | 1MHz Synchronous Buck Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7322/A
2A, 5V, 1MHz Synchronous Buck Converter
Features
General Description
• High Efficiency up to 94%
• Adjustable Output Voltage from 0.8V to VPVDD
• Operating from 2.9 to 6V Supply
• Integrated 85mΩ High Side / 75mΩ Low Side
MOSFETs
• Low Dropout Operation: 100% Duty Cycle
• Stable with Low ESR Ceramic Capacitors
• Current up to 2A
• Power-On-Reset Detection on VCC and VIN
• Mode Selestion :
APW7322 : Automatic PFM/PWM
APW7322A : Forced PWM
• Integrate Soft-Start and Soft-Stop
• Over-Temperature Protection
• Over-Voltage Protection
• Under-Voltage Protection
• High/ Low Side Current Limit
• Power Good Indication
• Enable/Shutdown Function
• Available in SOP-8P and TDFN3x3-10 Packages
• Lead Free and Green Devices Available
(RoHS Compliant)
Pin Configuration
APW7322/A is a synchronous buck converters with inte-
grated 85mΩ high side and 75mΩ low side power
MOSFETs. The APW7322/A with a current-mode control
scheme can convert wide input voltage of 2.9V to 6V to
the output voltage adjustable from 0.8V to 6V to provide
excellent output voltage regulation.
The APW7322/A is equipped with an automatic Skip/PWM
mode operation. At light load , the IC operates in the Skip
mode to reduce the switching losses. At heavy load, the
IC works in PWM mode.
The APW7322/A is also equipped with Power-on-reset,
soft start, soft-stop, and whole protections (under-voltage,
over-voltage, over-temperature and current-limit) into a
single package.
This device, available in SOP-8, TDFN3x3-10 packages,
provides a very compact system solution external com-
ponents and PCB area.
Applications
• Notebook Computer & UMPC
• LCD Monitor/TV
• Set-Top Box
• DSL, Switch HUBr
• Portable Instrument
Simplified Application Circuit
EN 1
PGND 2
PGND 3
LX 4
LX 5
10 FB
9 GND
EP 8 POK
7 VCC
6 VIN
TDFN3x3-10
(Top View)
EP
Exposed Pad
(connected to GND plane for better heat dissipation)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Aug., 2013
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APW7322/A
Pin Description
Pin
NO.
SOP-8 TDFN3x3-10
Name
Function
Signal Input. VCC supplies the control circuitry, gate drivers. Connecting a ceramic bypass
1 7 VCC capacitor from VCC to GND to eliminate switching noise and voltage ripple on the input to
the IC.
Power Good Output. This pin is open-drain logic output that is
2 8 POK pulled to ground when the output voltage is not within 12.5% of regulation point. The
POK pin, if used, needs an external pull high resistor in the range of 30kΩ~100kΩ.
3 9 GND Ground. Power and signal ground.
Output Feedback Input. The APW7322/A senses the feedback voltage via FB and
4 10 FB regulates the voltage at 0.8V. Connecting FB with a resistor-divider from the converter’s
output sets the output voltage.
Enable Input. EN is a digital input that turns the regulator on or off. Driving the EN high
5 1 EN turns on the regulator, otherwise, driving it low turns it off. The EN pin is internally pulled
high via a 300k resistor.
6 2, 3 PGND Power Ground.
7 4,5
LX Power Switching Output. LX is the Junction of the high-side and low-side Power
MOSFETs to supply power to the output LC filter.
8 6 VIN Power Input. VIN supplies the step-down converter switches.
9 11 Exposed Pad Exposed pad. Connect the exposed pad to the system ground plan with large copper area
for dissipating heat into the ambient air.
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Aug., 2013
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7322/A
Typical Application Circuit
VIN
5V
CIN
22µF
On
Off
100kΩ
R4
2.2Ω
C2
1µF
VIN LX
VCC
FB
APW7322
R5
C3
POK
EN
Exposed
GND PGND pad
L1
2.2 µH
C1
22pF
VOUT
1.8V/3.2A
R1
25kΩ
COUT
22µ Fx2
R2
20kΩ
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Aug., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet APW7322A.PDF ] | |
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