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APW8821 Datasheet Preview

APW8821 Datasheet

Notebook PWM Controller

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APW8821
Notebook PWM Controller with Differential Voltage Feedback
Features
General Description
Adjustable Output Voltage from +0.5V to +3.3V
The APW8821 is a single-phase, constant on-time, syn-
- 0.5V Reference Voltage
chronous PWM controller, which drives N-channel
- +0.6% Accuracy
MOSFETs. The APW8821 steps down high voltage to
generate low-voltage chipset or RAM supplies in note-
Operates from An Input Battery Voltage Range of book computers.
+1.8V to +28V
The APW8821 provides excellent transient response and
Remote Feedback Sense for Excellent Output
Voltage
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8821 provides
very high efficiency over light to heavy loads with loading-
REFIN Function for Over-clocking Purpose from
0.5V~2.5V range
Power-On-Reset Monitoring on VCC Pin
modulated switching frequencies. In PWM Mode, the con-
verter works nearly at constant frequency for low-noise
requirements. APW8821 is built in remote sense func-
tion for applications that require remote sense.
Excellent line and load transient responses
The APW8821 is equipped with accurate positive cur-
PFM mode for increased light load efficiency
350kHz Constant PWM Switching Frequency
Integrated MOSFET Drivers
Integrated Bootstrap Forward P-CH MOSFET
rent limit, output under-voltage, and output over-volt-
age protections, perfect for NB applications. The Power-
On-Reset function monitors the voltage on VCC to
prevent wrong operation during power-on. The
APW8821 has a 1ms digital soft start and built-in an
Adjustable Integrated Soft-Start and Soft-Stop
integrated output discharge device for soft stop. An
Power Good Monitoring
70% Under-Voltage Protection
125% Over-Voltage Protection
Adjustable Current-limit protection
internal integrated soft-start ramps up the output volt-
age with programmable slew rate to reduce the start-
up current. A soft-stop function actively discharges the
output capacitors.
The APW8821 is available in 10pin TDFN 3x3 package
-Using Sense Low-Side MOSFET?¦s RDS(ON)
respectively.
Over-Temperature Protection
TDFN-10 3x3 package
Lead Free and Green Device Available
(RoHS Compliant)
Applications
Notebook
Table PC
Hand-Held Portable
AIO PC
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 - Feb., 2012
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/




ANPEC

APW8821 Datasheet Preview

APW8821 Datasheet

Notebook PWM Controller

No Preview Available !

APW8821
Simplified Application Circuit
VCC=5V
RPOK
REFIN
POK
UGATE
APW8821
VOUT
PHASE
Q1
L
RTN
LGATE/
OCSET
Q2
VIN
VOUT
Ordering and Marking Information
APW8821
Assembly Meterial
Handling Code
Temp. erature Range
Package Code
Package Code
QB: TDFN3x3-10
Tempe. rature Range
I : -40 to 85 oC
Handling Code
TR : Tape & Reel
Assembly Meterial
L : Lead Free Device G : Halogen and Lead Free Device
APW 8821 QB :
APW
8821
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-020D 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).
Pin Configuration
POK 1
REFIN 2
VOUT 3
RTN 4
FB 5
10 BOOT
9 UGATE
8 PHASE
7 VCC
6 LGATE/OCSET
TDFN3x3-10
Top View
= GND and Thermal Pad (connected to GND plane for better heat dissipation)
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Feb., 2011
2
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/


Part Number APW8821
Description Notebook PWM Controller
Maker ANPEC
PDF Download

APW8821 Datasheet PDF






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