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ANPEC

APW7108 Datasheet Preview

APW7108 Datasheet

Dual Mobile-Friendly PWM Controller

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APW7108
Dual Mobile-Friendly PWM Controller
Features
Adjustable Output Voltage up to 5.5V
- 0.9V Reference Voltage
- ±1% Accuracy Over Temperature
Operates from an Input Battery Voltage Range of
5V to 24V or from 3.3V/5V System Rail
Power-On-Reset Monitoring on VCC Pin
Selectable Forced PWM or Automatic PFM/PWM
Mode
Constant-On-Time Control Scheme
- Switching Frequency Compensation for PWM
Mode
- Constant Switching Frequency (CH1: 345kHz,
CH2: 255KHz) in PWM Mode with DC Output Current
Excellent Line and Load Transient Responses
Adjustable Soft-Start and Soft-Stop
Power-Good Outputs for both Channels
Adjustable Current-Limit Protection
- Using Sense Resistor or MOSFET’s R
DS(ON)
115% Over-Voltage Protection
- No Negative Output Voltage Occurred
70% Under-Voltage Protection
Adaptive Dead-Time Control
- Sensing G-to-S Voltage of Power MOSFETs
Shutdown Control for both Channels
28-pin SSOP (SSOP-28) and 4mmx4mm 24-lead
QFN (QFN4x4-24) Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7108 is a dual-channel, constant on-time, and
synchronous PWM controller which drives dual N-
channel MOSFETs for each channel. The APW7108 steps
down high voltage of a battery to generate low-voltage
chipset or RAM supplies in notebook computers.
The APW7108 provides excellent transient response and
accurate DC voltage output in either PFM or PWM
mode. In PFM mode, the APW7108 provides very high
efficiency over light to heavy loads with loading-modu-
lated switching frequencies. The Forced-PWM mode
works nearly at constant frequency for low-noise
requirements.
The APW7108 is equipped with accurate current-limit,
output under-voltag, and output over-voltage protections,
perfect for NB applications. A Power-On-Reset function
monitors the voltage on VCC to prevent wrong opera-
tion during power on. A soft-start ramps up the output
voltage with programmable slew rate to reduce the
start-up current. A soft-stop function actively discharges
the output capacitors with controlled reverse inductor
current. At the end of the soft-stop, the APW7108 forces
LGATE high to prevent over-voltage in shutdown. The
APW7108 has individual enable controls for each
channel. Pulling both EN pin low shuts down the whole
chip with low quiescent current close to zero.
The APW7108 is available in SSOP-28 and QFN4x4-24
packages.
Simplified Application Circuit
Applications
Note Book Computers
- Chipset/RAM Supplies as low as 0.9V
- 1.8V and 2.5V Supplies
Step-Down Converters Requiring High Efficiency
SSOP-28
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.4 - Jan., 2009
www.anpec.com.tw




ANPEC

APW7108 Datasheet Preview

APW7108 Datasheet

Dual Mobile-Friendly PWM Controller

No Preview Available !

APW7108
Ordering and Marking Information
APW7108
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
N : SSOP-28
QA: QFN4x4-24
Operating Ambient Temperature Range
I : -40 to 85° C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
APW7108 N :
APW7108
XXXXX
XXXXX - Date Code
APW7108 QA :
APW7108
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-
020C 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
UGATE1 1
BOOT1 2
ISEN1 3
EN1 4
VOUT1 5
VSEN1 6
Backside
Exposed Pad
18 UGATE2
17 BOOT2
16 ISEN2
15 EN2
14 VOUT2
13 VSEN2
APW7108 (QFN4x4-24)
Top View
Absolute Maximum Ratings (Note 1)
GND 1
LGATE1 2
PGND1 3
PHASE1 4
UGATE1 5
BOOT1 6
ISEN1 7
EN1 8
VOUT1 9
VSEN1 10
OCSET1 11
SOFT1 12
NC 13
VIN 14
28 VCC
27 LGATE2
26 PGND2
25 PHASE2
24 UGATE2
23 BOOT2
22 ISEN2
21 EN2
20 VOUT2
19 VSEN2
18 OCSET2
17 SOFT2
16 PG2
15 PG1
APW7108 (SSOP-28)
Top View
Symbol
VCC
VIN
VBOOT
VBOOT-GND
Parameter
VCC Supply Voltage (VCC to GND)
Input Power Voltage (VIN to GND)
BOOT Supply Voltage (BOOT to PHASE)
BOOT Supply Voltage (BOOT to GND)
UGATE Voltage (UGATE to PHASE)
<400ns pulse width
>400ns pulse width
LGATE Voltage (LGATE to GND)
<400ns pulse width
>400ns pulse width
Rating
-0.3 ~ 7
-0.3 ~ 28
-0.3 ~ 7
-0.3 ~ 35
-5 ~ VBOOT+0.3
-0.3 ~ VBOOT+0.3
-5 ~ VCC+0.3
-0.3 ~ VCC+0.3
Unit
V
V
V
V
V
V
Copyright © ANPEC Electronics Corp.
2
Rev. A.4 - Jan., 2009
www.anpec.com.tw



Part Number APW7108
Description Dual Mobile-Friendly PWM Controller
Maker ANPEC
Total Page 3 Pages
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APW7108 Datasheet PDF





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