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PDF APW8825A Data sheet ( Hoja de datos )
| Número de pieza | APW8825A | |
| Descripción | 3A 5V 1MHz Synchronous Buck Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW8825A
3A 5V 1MHz Synchronous Buck Converter
Features
General Description
• High Efficiency up to 95%
APW8825A is a 3A synchronous buck converter with inte-
- Automatic Skip/PWM Mode Operation
grated 110mΩ high side and 80mΩ low side power
• Adjustable Output Voltage from 0.6V to VIN
MOSFETs. The APW8825A design with a current-mode
control scheme, can convert wide input voltage of 2.6V to
• Integrated 110mΩ High side 80mΩ Low Side 5.5V to the output voltage adjustable from 0.6V to 5.5V to
MOSFET
provide excellent output voltage regulation.
• Low Dropout Operation : 100% Duty cycle
The APW8825A is equipped with an automatic Skip/PWM
• Stable with Low ESR Ceramic Capacitors
mode operation. At light load, the IC operates in the Skip
• Power-On-Reset Detection on VIN
mode to reduce the switching losses. At heavy load, the
• Integrate Soft Start and Soft-Stop
IC works in PWM mode. At PWM mode, the switching
• Over-Temperature Protection
• Over Voltage Protection
• Under Voltage Protection
• High/ Low Side Current Limit
• Power Good Indication
• Enable/Shutdown Function
• Small SOT-23-6 and TDFN2x2-8 packages
frequency is set by the external resistor.
The APW8825A 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 TDFN2X2-8 and SOT-23-6 provide
a very compact system solution external components and
PCB area.
• Lead Free and Green Devices Available (RoHS
compliant)
Applications
Simplified Application Circuit
• Notebook Computer & UMPC
• LCD Minitor/TV
• Set-Top Box
• DSL, Switch HUB
• Portable Instrument
VIN
CIN
VIN POK
APW8825A LX
NC
FB
L1
VOUT
R1
COUT
R2
ON
OFF
EN
PGND
AGND
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.1 - Aug., 2015
1
www.anpec.com.tw
1 page  
APW8825A
Pin Description
PIN
TDFN2x2-8 TSOP23-6
16
2
3
4,
Exposed pad
5
6
7
8
-
5
4
-
-
3
1
-
2
Name
Function
FB
POK
VIN
PGND
NC
LX
EN
AGND
GND
Output Feedback Input. The APW8825A senses the feedback voltage via FB and
regulates the voltage at 0.6V. Connecting FB with a resistor-divider from the converter’s
output sets the output voltage.
Power Good Output. This pin is open-drain logic output that is pulled to ground when the
output voltage is not within 10% of regulation point.
The control circuitry and converter supply input. Connecting a ceramic bypass capacitor
from VIN to GND to eliminate switching noise and voltage ripple on the input to the IC.
Power ground. Connect this pin to AGND.
No internal connection.
Power Switching Output. LX is the Junction of the high-side and low-side Power
MOSFETs to supply power to the output LC filter.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
the regulator, drive it low to turn it off.
Analog ground. Connect this pin to PGND.
Power and signal ground.
Block Diagram
VIN
Over
Temperature
Protection
125%VREF
66%VREF
Power-
On-
Reset
OTP
OVP
POR
UVP
POK
LOC
Current
Limit
Fault
Logics
Current
Sense
Amplifier
Zero Crossing
Comparator
Inhibit
Gate
Control
FB 90%VREF
ISS
Error
Amplifier
Gm
VREF
0.6V
Current
Compartor
Shutdown
Slope
Compensation
Oscillator
Gate
Driver
Gat
e
LOC
Current
Sense
Amplifier
POK
EN
LX
GND
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Aug., 2015
5
www.anpec.com.tw
5 Page 
APW8825A
Taping Direction Information
TDFN2x2-8
USER DIRECTION OF FEED
SOT-23-6
USER DIRECTION OF FEED
AAAX
AAAX
AAAX
AAAX
AAAX
AAAX
AAAX
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Aug., 2015
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet APW8825A.PDF ] | |
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