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PDF APW7085 Data sheet ( Hoja de datos )
| Número de pieza | APW7085 | |
| Descripción | Asynchronous Step-Down Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7085
2A, 26V, 380kHz, Asynchronous Step-Down Converter
Features
General Description
• Wide Input Voltage from 4.5V to 26V
• Output Current up to 2A
• Adjustable Output Voltage from 0.8V to 90%VIN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
• 100mΩ Integrated P-Channel Power MOSFET
• High Efficiency up to 91%
- Pulse-Skipping Mode (PSM) / PWM Mode Op-
eration
• Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
• Power-On-Reset Monitoring
• Fixed 380kHz Switching Frequency in PWM Mode
• Built-in Digital Soft-Start
• Output Current-Limit Protection with Frequency
Foldback
• 70% Under-Voltage Protection
• Over-Temperature Protection
• <5µA Quiescent Current during Shutdown
• SOP-8 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• LCD Monitor / TV
• Set-Top Box
• Portable DVD
• Wireless LAN
• ADSL, Switch HUB
• Notebook Computer
• Step-down Converters Requiring High Efficiency
and 2A Output Current
The APW7085 is a 2A, asynchronous, step-down con-
verter with integrated 100mΩ P-channel MOSFET. The
device, with current-mode control scheme, can convert
4.5~26V input voltage to the output voltage adjustable
from 0.8 to 90% VIN to provide excellent output voltage
regulation.
The APW7085 regulates the output voltage in automatic
PSM/PWM mode operation, depending on the output
current, for high efficiency operation over light to full load
current. The APW7085 is also equipped with power-on-
reset, soft-start, and whole protections (under-voltage,
over- temperature, and current-limit) into a single package.
In shutdown mode, the supply current drops below 5µA.
This device, available in an 8-pin SOP-8 package, pro-
vides a very compact system solution with minimal exter-
nal components.
100
90 VOUT=5V
80
70
60 VOUT=3.3V
50
40
30
20
10
0
0.001
0.01
0.1
1
Output Current, IOUT (A)
10
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.6 - Apr., 2010
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APW7085
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over VIN=12V, VOUT=3.3V and TA= -40 ~ 85oC, unless
otherwise specified. V is regulated by an internal regulator. Typical values are at T =25oC.
CC A
Symbol
Parameter
Test Conditions
APW7085
Min. Typ. Max.
Unit
SOFT-START, ENABLE AND INPUT CURRENTS (CONT.)
IFB FB Pin Input Current
VFB = 0.8V
-100
-
+100
nA
IEN EN Pin Input Current
VEN < 3V
-500
-
+500
nA
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Apr., 2010
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7085
Pin Description
PIN NAME
FUNCTION
Power Input. VIN supplies the power (4.5V to 26V) to the control circuitry, gate driver and step-down
1 VIN converter switch. Connecting a ceramic bypass capacitor and a suitably large capacitor between
VIN and GND eliminates switching noise and voltage ripple on the input to the IC.
2
EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.
Gate driver power ground of the P-channel Power MOSFET. A linear regulator regulates a 5.5V
3
UGND
voltage between VIN and UGND to supply power to P-channel MOSFET gate driver. Connect a
ceramic capacitor (1µF typ.) between VIN and UGND for noise decoupling and stability of the linear
regulator.
Bias input and 4.2V linear regulator’s output. This pin supplies the bias to some control circuits. The
4
VCC
4.2V linear regulator converts the voltage on VIN to 4.2V to supply the bias when no external 5V
power supply is connected with VCC. Connect a ceramic capacitor (1µF typ.) between VCC and
GND for noise decoupling and stability of the linear regulator.
5
LX
Power Switching Output. LX is the Drain of the P-channel MOSFET to supply power to the output.
Connect the pin to output LC filter.
Output of error amplifier. Connect a series RC network from COMP to GND to compensate the
6 COMP regulation control loop. In some cases, an additional capacitor from COMP to GND is required for
noise decoupling.
Feedback Input. The IC senses feedback voltage via FB and regulate the voltage at 0.8V.
7 FB Connecting FB with a resistor-divider from the output set the output voltage in the range from 0.8V
to 90% VIN.
8 GND Power and Signal Ground.
Block Diagram
VIN
VCC
FB
COMP
EN
VCC
4.2V Regulator
and
Power-On-Reset
POR
Current
Limit
70%VREF
UVP
Soft-Start
Soft-Start
and
Fault Logic
VREF
0.8V
Error
Amplifier
2.5V
0.8V
ENOK
Enable
Over
Temperature
Protection
Current Sense
Amplifier
Inhibit
Gate
Control
Current
Compartor
Slope
Compensation
Oscillator
FB 380kHz
Gate
Driver
UG
Linear
Regulator
VIN
UGND
LX
GND
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Apr., 2010
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet APW7085.PDF ] | |
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