APW7138 Datasheet, PDF (1/26 Pages) Anpec Electronics Coropration – High-Performance Notebook PWM Controller

APW7138
High-Performance Notebook PWM Controller
Features
General Description
• Adjustable Output Voltage from +0.6V to +3.3V
The APW7138 is a single-phase, constant-on-time, and
- 0.6V Reference Voltage
synchronous PWM controller which drives N-channel
- ±1% Accuracy Over Temperature
MOSFETs. The APW7138 steps down high voltage of a
• Operates from an Input Battery Voltage Range of _{battery to generate low-voltage chipset or RAM supplies}
+3V to +25V
in notebook computers.
• Wide Output Load Range from 0A to 25A
The APW7138 provides excellent transient response and
• Power-On-Reset Monitoring on VCC Pin
accurate DC voltage output in either PFM or PWM Mode.
• Excellent Line and Load Transient Response
In Pulse Frequency Modulation (PFM) Mode, the APW7138
• PFM Mode for Increased Light Load Efficiency
provides very high efficiency over light load with loading-
• Programmable PWM Frequency from 200kHz to _{modulated switching frequencies. When the inductor}
•
•
•
600kHz
Integrated MOSFET Drivers and Bootstrap Diode
Internal Integrated Soft-Start and Soft-Stop
Selectable Forced PWM or Automatic PFM/PWM
current is continuous, the operation automatically enters
PWM mode with relatively constant switching frequency.
For QFN4x4-16A and TQFN3x3-16 packages, the Forced-
PWM Mode works nearly at constant frequency for low-
Mode (only for QFN4x4-16A and TQFN3x3-16
Packages)
noise requirements.
• Power Good Monitoring
The APW7138 is equipped with accurate over-current,
• Fault Identification by PGOOD Pull-Down
output under-voltage, and over-voltage protections per-
Resistance
fect for NB application. A Power-On-Reset function moni-
• 70% Under-Voltage Protection (UVP)
tors the voltage on VCC pin to prevent errorneous opera-
• 124% Over-Voltage Protection (OVP)
tion during power-on. The APW7138 has a digital soft-
• Adjustable Over-Current Protection (OCP)
start and soft-stop. The internal integrated soft-start ramps
- Sensing Low-Side MOSFET’s Current
up the output voltage with controlled slew rate to reduce
• Over-Temperature Protection (OTP)
the start-up current. The digital soft-stop function actively
• SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4- ^{discharges the output capacitors with controlled reverse}
16A), and TQFN3x3-16 Packages
• Lead Free and Green Devices Available
inductor current.
The APW7138 is available in SSOP-16, QFN4x4-16A, and
(RoHS Compliant)
TQFN3x3-16 packages.
Applications
Simpilfied Application Circuit
• PCI Express Graphical Processing Unit
• Notebook Adapter
• Auxiliary Power Rail
• VRM
FCCM
(Only QFN)
V_CC=5V EN
APW7138
R_FSET
V_IN
+3V~25V
Q1
L
V_OUT
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.5 - Jul., 2010
www.anpec.com.tw