APW8815 Datasheet, PDF (1/28 Pages) Anpec Electronics Coropration – High-Performance Notebook PWM Controller

APW8815
High-Performance Notebook PWM Controller
Features
General Description
• Adjustable Output Voltage from +0.75V to +5.5V The APW8815 is a single-phase, constant-on-time,
- 0.75V Reference Voltage
synchronous PWM controller, which drives N-channel
- ±1% Accuracy Over-Temperature
MOSFETs. The APW8815 steps down high voltage to
• Operates from An Input Battery Voltage Range of ^{generate low-voltage chipset or RAM supplies in notebook}
+1.8V to +28V
computers.
• Power-On-Reset Monitoring on VCC Pin and PVCC ^{The APW8815 provides excellent transient response and}
accurate DC voltage output in either PFM or PWM Mode.
Pin
In Pulse Frequency Mode (PFM), the APW8815 provides
• Excellent Line and Load Transient Responses
very high efficiency over light to heavy loads with loading-
• PFM Mode for Increased Light Load Efficiency
modulated switching frequencies. In PWM Mode, the
• Programmable PWM Frequency from 100kHz to _{converter works nearly at constant frequency for low-noise}
500kHz
requirements.
• Integrated MOSFET Drivers
The APW8815 is equipped with accurate positive current-
• Integrated Bootstrap Forward P-CH MOSFET
limit, output under-voltage, and output over-voltage
• Adjustable Integrated Soft-Start and Soft-Stop
protections, perfect for NB applications. The Power-On-
• Selectable Forced PWM or Automatic PFM/PWM ^{Reset function monitors the voltage on VCC and PVCC to}
Mode
• Power Good Monitoring
• 70% Under-Voltage Protection
prevent wrong operation during power-on. The APW8815
has a 1.2ms digital soft-start and built-in an integrated
output discharge device for soft-stop. An internal
integrated soft-start ramps up the output voltage with
• 125% Over-Voltage Protection
programmable slew rate to reduce the start-up current. A
• Adjustable Current-Limit Protection
soft-stop function actively discharges the output
- Using Sense Low-Side MOSFET’s R_DS(ON)
• Over-Temperature Protection
capacitors.
The APW8815 is available in 14pin TSSOP, 14pin QFN
• TSSOP-14, QFN3.5x3.5-14, and TQFN3x3-16 ^{and 16pin TQFN packages respectively.}
Packages
• Lead Free and Green Devices Available
Simplified Application Circuit
(RoHS Compliant)
V_CC=5V
EN
V_IN
Applications
• Notebook
• Table PC
• Hand-Held Portable
• AIO PC
R_TON
R_OCSET
PHASE
TON
OCSET
UGATE
PHASE
LGATE
Q1
L
Q2
V_OUT
APW8815
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.2 - Apr., 2011
www.anpec.com.tw