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Anpec Electronics Coropration

APW7145 Datasheet Preview

APW7145 Datasheet

Synchronous-Rectified Buck Converter

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APW7145
3A, 12V, Synchronous-Rectified Buck Converter
Features
General Description
Wide Input Voltage from 4.3V to 14V
Output Current up to 3A
Adjustable Output Voltage from 0.8V to VIN
- ±2% System Accuracy
55mIntegrated Power MOSFETs
High Efficiency up to 95%
- Automatic Skip/PWM Mode Operation
Current-Mode Operation
- Easy Feedback Compensation
- Stable with Low ESR Output Capacitors
- Fast Load/Line Transient Response
Power-On-Reset Monitoring
Fixed 500kHz Switching Frequency in PWM Mode
Built-in Digital Soft-Start and Soft-Stop
Current-Limit Protection with Frequency Foldback
118% Over-Voltage Protection
Hiccup-Mode 50% Under-Voltage Protection
Over-Temperature Protection
<3µA Quiescent Current in Shutdown Mode
SOP-8P and Compact 4mmx4mm DFN-8
www.DataSheet(4DUF.Nco4mx4-8) Packages
Lead Free and Green Devices Available
(RoHS Compliant)
Applications
OLPC, UMPC
Notebook Computer
Handheld Portable Device
Step-Down Converters Requiring High Efficiency
and 3A Output Current
The APW7145 is a 3A synchronous-rectified Buck con-
verter with integrated 55mpower MOSFETs. The
APW7145, designed with a current-mode control scheme,
can convert wide input voltage of 4.3V to 14V to the out-
put voltage adjustable from 0.8V to VIN to provide excel-
lent output voltage regulation.
For high efficiency over all load current range, the
APW7145 is equipped with an automatic Skip/PWM mode
operation. At light load, the IC operates in the Skip mode,
which keeps a constant minimum inductor peak current,
to reduce switching losses. At heavy load, the IC works in
PWM mode, which inductor peak current is programmed
by the COMP voltage, to provide high efficiency and ex-
cellent output voltage regulation.
The APW7145 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. In shutdown mode, the supply current
drops below 3µA.
This device, available SOP-8P and DFN4x4-8 packages,
provides a very compact system solution with minimal
external components and PCB area.
100
90
80
70
60
50
40
30
20
10
0
0.001
VIN=5V, VOUT=3.3V, L1=2.2µF
VIN=12V, VOUT=5V, L1=6.8µF
VIN=12V, VOUT=3.3V, L1=4.7µF
VIN=5V, VOUT=1.2V, L1=2.2µF
VIN=12V, VOUT=2V, L1=3.3µF
0.01
0.1
1
10
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.3- Sep., 2008
1
www.anpec.com.tw




Anpec Electronics Coropration

APW7145 Datasheet Preview

APW7145 Datasheet

Synchronous-Rectified Buck Converter

No Preview Available !

APW7145
Pin Configuration
NC 1
VIN 2
AGND 3
FB 4
APW7145
9
LX
8 PGND
7 LX
6 EN
5 COMP
SOP-8P Top View
APW7145
NC 1
VIN 2
AGND 3
FB 4
8 PGND
7 LX
6 EN
5 COMP
DFN 4x4-8 Top View
The Pin 7 must be connected to the Exposed Pad
Ordering and Marking Information
APW7145
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
KA : SOP-8P QA: DFN4x4-8
Operating Ambient Temperature Range
I : -40 to 85 oC
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
APW7145 KA :
APW7145
XXXXX
XXXXX - Date Code
APW7145 QA :
APW7145
XXXXX
XXXXX - Date Code
Note : ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish;
which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-
020C for MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and
halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed
1500ppm by weight).
www.DataSheet4U.com
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Rating
VIN VIN Supply Voltage (VIN to AGND)
-0.3 ~ 15
VLX LX to GND Voltage
> 100ns
< 100ns
-1 ~ VIN+1
- 5 ~ VIN+5
PGND to AGND Voltage
-0.3 ~ +0.3
EN to AGND Voltage
-0.3 ~ VIN+0.3
FB, COMP to AGND Voltage
-0.3 ~ 6
PD Power Dissipation
Internally Limited
Maximum Junction Temperature
150
TSTG
Storage Temperature
-65 ~ 150
TSDR
Maximum Lead Soldering Temperature, 10 Seconds
260
Note 1 : Stresses above those listed in bsolute Maximum Ratings may cause permanent damage to the device.
Unit
V
V
V
V
V
W
oC
oC
oC
Copyright © ANPEC Electronics Corp.
Rev. A.3- Sep., 2008
2
www.anpec.com.tw


Part Number APW7145
Description Synchronous-Rectified Buck Converter
Maker Anpec Electronics Coropration
Total Page 23 Pages
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