APW8727 Datasheet, PDF (1/23 Pages) Anpec Electronics Coropration – Synchronous single PWM Controller with Multiform supply Voltage

APW8727/L
Synchronous single PWM Controller with Multiform supply Voltage
Features
General Description
• Adjustable Output Voltage from +0.8V to +5.0V
The APW8727 is a single-phase, constant on-time, syn-
- 0.8V Reference Voltage
chronous PW M controller, which drives N-channel
- +0.6% Accuracy
MOSFETs. The APW8727 steps down high voltage to
• Operates from An Input Battery Voltage Range of generate low-voltage chipset, RAM supplies in notebook
+4V to +25V
computers or motherboard applications.
• Multiform Purpose Input Voltage Collocation
- -V_CC=5V / V_IN=8~19V For NB application
- V_CC=5~12V / V_IN=5~12V For table PC application
•
Power-On-Reset Monitoring on V pin
CC
• Excellent line and load transient responses
• Ultrasonic Operation Eliminated Audio Noise
• PFM mode for increased light load efficiency
• 300kHz Constant PWM Switching Frequency
• Integrated MOSFET Drivers
The APW8727 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8727 provides
very high efficiency over light to heavy loads with loading-
modulated switching frequencies. In PWM Mode, the con-
verter works nearly at constant frequency for low-noise
requirements. The unique ultrasonic mode maintains the
switching frequency above 37kHz, which eliminates noise
in audio application.
The APW8727 is equipped with accurate positive current
• Integrated Bootstrap Forward P-CH MOSFET
limit, output under-voltage, and output over-voltage
• Integrated Soft-Start Function
• Power Good Monitoring
• 70% Under-Voltage Protection
• 125% Over-Voltage Protection
• Adjustable Current-limit protection
- Using Sense Low-Side MOSFET’s R_DS(ON)
• Over-Temperature Protection
• TDFN-10 3x3 package
protections, perfect for multiform applications. The Power-
On-Reset function monitors the voltage on VCC to pre-
vent wrong operation during power-on. The APW8727 has
an internal 2ms digital soft start that ramps up the output
voltage with programmable slew rate to reduce the start-
up current. The enable function can let user easy to apply
APW8727.
The APW8727 is available in 10pin TDFN 3x3 package
respectively.
• Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
Applications
• Notebook
• Table PC
• Hand-Held Portable
• AIO PC
• Wide input DC/DC Regulators
4.5~13.2V
VCC
UGATE
APW8727
POK
PHASE
EN
LGATE/
OCSET
4~25V
VIN
Q1
L
VOUT
Q2
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.
1
Rev. A.1 - Apr., 2013
www.anpec.com.tw