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PDF APW7176 Data sheet ( Hoja de datos )
| Número de pieza | APW7176 | |
| Descripción | 1A Synchronous Step-Down Converter | |
| Fabricantes | ANPEC | |
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APW7176
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 APW7176 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 APW7176 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 APW7176 can
also run at 100% duty cycle for low dropout applications.
Pin Configuration
EN1 1
FB1 2
IN2 3
GND2 4
SW2 5
APW7176
TDFN3x3-10
(Top View)
10 SW1
9 GND1
8 IN1
7 FB2
6 EN2
Exposed pad
on backside
Ordering and Marking Information
APW7176
APW7176 QB:
APW
7176
XXXXX
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
QB : TDFN3x3-10
Temperature Range
I : -40 to 85 oC
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
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  
APW7176
Operating Waveforms
(Refer to the application circuit in the section “Typical Application Circuits”, VIN=3.6V, VOUT=1.8V, TA=25oC unless
otherwise specified)
VEN
VOUT ,1V/Div, DC
IIN, 200mA/Div
L=2.2µH, VIN=5V, COUT=10µF
µ
1A
300mA
IOUT, 0.5A/Div, DC
VOUT ,100mV/Div, AC
L=2.2µH, VIN=5V, VOUT=1.8V, COUT=10µF
µ
1.5V
2.5V
VIN, 0.5V/Div
VSW ,2V/Div, DC
VOUT ,20mV/Div, AC
VOUT,200mV/Div,AC
IL, 500mV/Div, DC
L=2.2µH, VIN=5V, VOUT=1.2V, COUT=10µF
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Mar., 2011
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7176
Application Information (Cont.)
Layout Consideration
For all switching power supplies, the layout is an impor-
tant step in the design; especially at high peak currents
and switching frequencies. If the layout is not carefully
done, the regulator might show noise problems and duty
cycle jitter.
1. The input capacitor should be placed close to the VIN
and the GND. Connecting the capacitor and VIN/GND
with short and wide trace without any via holes for good
input voltage filtering.
2. The high current paths (GND1/GND2, IN1/IN2, and SW1/
SW2) should be placed very close to the device with
short, direct and wide traces.
3. To minimize copper trace connections that can inject
noise into the system, the inductor should be placed as
close as possible to the SW pin to minimize the noise
coupling into other circuits.
4. Since the feedback pin and network is a high imped-
ance circuit, the feedback network should be routed
away from the inductor. The feedback pin and feedback
network should be shielded with a ground plane or
trace to minimize noise coupling into this circuit.
5. A star ground connection or ground plane minimizes
ground shifts and noise is recommended.
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Mar., 2011
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet APW7176.PDF ] | |
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