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APW7179のメーカーはANPECです、この部品の機能は「1A Synchronous Step-Down Converter」です。 |
部品番号 | APW7179 |
| |
部品説明 | 1A Synchronous Step-Down Converter | ||
メーカ | ANPEC | ||
ロゴ | |||
このページの下部にプレビューとAPW7179ダウンロード(pdfファイル)リンクがあります。 Total 16 pages
APW7179
Dual 1.5MHz, 1A Synchronous Step-Down Converter
Features
General Description
• 1A Output Current on Each Channel
• 2.7V to 5.5V Input Voltage Range
• 1.5MHz Constant Frequency Operation
• Low Dropout Operation at 100% Duty Cycle
• Synchronous Topology
• 0.6V Low Reference Voltage
• Current Mode Operation
• Over-Temperature Protection
• Over-Current Protection
• Up to 94% Efficiency
• Internally Compensated
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• TV Tuner/Box
• Portable Instrument
The APW7179 consists of two independent 1.5MHz con-
stant frequency, current mode, and PWM step-down
converters. Each converter integrates a main switch with
a synchronous rectifier for high efficiency without an ex-
ternal Schottky diode. The APW7179 is ideal for powering
portable equipment that runs from a single cell Lithium-
Ion (Li+) battery. Each converter can supply 1A of load
current from a 2.7V to 5.5V input voltage. The output volt-
age can be regulated as low as 0.6V. The APW7179 can
also run at 100% duty cycle for low dropout applications.
Pin Configuration
IN2 1
SW2 2
GND2 3
FB1 4
NC 5
EN1 6
APW7179
TDFN3x3-12
(Top View)
12 EN2
11 NC
10 FB2
9 GND1
8 SW1
7 IN1
Exposed pad
on backside
Ordering and Marking Information
APW7179
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
QB : TDFN3x3-12
Temperature Range
I : -40 to 85 oC
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
APW7179 QB:
APW
7179
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).
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 - Mar., 2011
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 Page APW7179
Electrical Characteristics (Cont.)
The denotes the specifications that apply over VIN=3.6V and TA =25°C, unless otherwise specifications.
Symbol
Parameter
IDD
ISD
fOSC
fOSC_FFB
RDS-P
RDS-N
VEN1/EN2
TOTP
Each Converter Load Regulation
Each Converter Quiescent Current
Each Converter Quiescent Current in
Shutdown
Each Converter Oscillator Frequency
Each Converter Frequency Foldback
Each Converter On Resistance of
PMOSFET
Each Converter On Resistance of
NMOSFET
Each Converter Enable Threshold
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Test Conditions
IOUT=10mA~1A
VFB=0.7V
VEN1/EN2=0V, VIN=4.2V
VFB=0.6V
VFB=0V
ISW=100mA
ISW=-100mA
APW7179
Min. Typ. Max.
- 0.5 -
- 30 50
- -1
1.2 1.5 1.8
- 210 -
- 0.28 -
- 0.25
0.4 -
- 150
- 50
-
1
-
-
Unit
%
µA
µA
MHz
kHz
Ω
Ω
V
oC
oC
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Mar., 2011
3
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
3Pages APW7179
Pin Description
PIN
NO. NAME
1 IN2
2 SW2
3 GND2
4 FB1
5, 11
NC
6 EN1
7 IN1
8 SW1
9 GND1
10 FB2
12
Exposed
Pad
EN2
NC
FUNCTION
Channel 2 Supply Input. Bypass to the GND2 with a 4.7µF or greater ceramic capacitor.
Channel 2 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET
switches.
Ground 2. Connected the exposed pad to the GND2.
Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The
feedback voltage is 0.6V.
No Internal Connection.
Channel 1 Enable Control Input. Drive EN1 above 1V to turn on the Channel 1. Drive EN1 below 0.4V to
turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1µA.
Don’t left this pin floating.
Channel 1 Supply Input. Bypass to the GND1 with a 4.7µF or greater ceramic capacitor.
Channel 1 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET
switches.
Ground 1. Connected the exposed pad to the GND1.
Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The
feedback voltage is 0.6V.
Channel 2 Enable Control Input. Drive EN2 above 1V to turn on the Channel 2. Drive EN2 below 0.4V to
turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1µA.
Don’t left this pin floating.
No Internal Connection. Connecting this pad to GND1 and GND2.
Block Diagram
EN1/EN2
Shutdown
Control
Over-
Temperature
Protection
Oscillator
Logic Control
Current
Limit
∑
ICMP
COMP
EAMP
Gate
Driver
Soft-
start
VREF
0.6V
Diagram Represents 1/2 of the APW7179
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Mar., 2011
6
IN1/IN2
SW1/SW2
GND1/GND2
FB1/FB2
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
6 Page | |||
ページ | 合計 : 16 ページ | ||
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PDF ダウンロード | [ APW7179 データシート.PDF ] |
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