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PDF APW7070 Data sheet ( Hoja de datos )
| Número de pieza | APW7070 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7070/A
3A, 20V, 380kHz, Synchronous Step-Down Converter
Features
General Description
• Wide Input Voltage from 4.75V to 20V
• Output Current up to 3A
•
Adjustable Output Voltage from 0.8V to 90%V
IN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
• 80mΩ Integrated MOSFETs
• High Efficiency up to 93%
• Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
• Power-On-Reset Monitoring
• Fixed 380kHz Switching Frequency in PWM Mode
• Automatic Pulse-Skipping Mode (PSM)/PWM
Mode Operation (APW7070A)
• Forced-PWM Operation (APW7070)
• Built-in Digital Soft-Start
• Output Current-Limit Protection with Frequency
Foldback
• 70% Under-Voltage Protection
• Over-Temperature Protection
• 118% Over-Voltage Protection
• <5µA Quiescent Current during Shutdown
• Thermal-Enhanced SOP-8P Package
• Pb-Free Available as an Option
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• LCD Monitor / TV
• SetTop Box
• Portable DVD
• Wireless LAN
• ADSL, Switch HUB
• Notebook Computer
• Step-Down Converters Requiring High Efficiency
and 3A Output Current
The APW7070/A is a 3A, synchronous, step-down con-
verter with integrated 80mΩ MOSFETs. The device, with
current-mode control scheme, can convert 4.75~20V in-
put voltage to the output voltage adjustable from 0.8 to
90% VIN to provide excellent output voltage regulation.
The APW7070A regulates the output voltage in an auto-
matic PSM/PWM mode operation, depending on the out-
put current, for high efficiency operation over light to full
load current. The APW7070 always works in a Forced-
PWM mode with constant frequency over full output cur-
rent range for low-noise requirements.The APW7070/A
is also equipped with power-on-reset, soft-start and whole
protections (including over-voltage, under-voltage, over-
temperature and current-limit) in a single package. In shut-
down mode, the supply current drops below 5µA.
This device, available in an 8-pin SOP-8P package, pro-
vides a very compact system solution with minimal exter-
nal components and good thermal conductance.
Typical Efficiency
100
90
80 VOVUT=5V
70 VOUT= 3.3V
60
50
40
30
20
100.001
0.01
APW7070A
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.4 - Nov., 2010
1
www.anpec.com.tw
FreeDatasheethttp://www.datasheetlist.com/
1 page  
APW7070/A
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. VCC is regulated by an internal regulator. Typical values are at TA=25oC.
Symbol
Parameter
Test Conditions
APW7070/A
Min.
Typ.
Max.
Unit
PROTECTIONS (CONT.)
VUV FB Under-Voltage Threshold
VFB falling
66 70 74 %
FB Under-Voltage Hysteresis
- 40 - mV
FB Under-Voltage Debounce
- 2 - µs
VOV FB Over-Voltage Threshold
VFB Rising
114 118 122 %
FB Over-Voltage Hysteresis
TOTP Over-Temperature Trip Point
Over-Temperature Hysteresis
- 40 - mV
- 150 - oC
- 50 - oC
TD Dead-Time
VLX = -0.7V, VIN = 4.75 ~ 20V
SOFT-START, ENABLE, AND INPUT CURRENTS
- 30 - ns
tSS Soft-Start Interval
Preceding Delay before Soft-Start
9
10.8
12
ms
9
10.8
12
ms
EN Logic Low Voltage
VEN falling, VIN = 4 ~ 20V
- - 0.5 V
EN Logic High Voltage
VEN rising, VIN = 4 ~ 20V
2.1 -
-V
EN Pin Clamped Voltage
IEN = 10mA
P-Channel Power MOSFET Leakage
Current
VEN = 0V, VLX = 0V, VIN = 20V
12 - 17 V
- - 4 µA
IFB FB Pin Input Current
VFB = 0.8V
-100
-
+100
µA
IEN EN Pin Input Current
VEN < 3V
-500
-
+500
µA
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Nov., 2010
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7070/A
Pin Description
PIN
NO. NAME
1 VIN
2 EN
3 UGND
4 VCC
5 LX
6 COMP
7
8
9
(Exposed Pad)
FB
GND
LX
Block Diagram
FUNCTION
Power Input. VIN supplies the power (4.75V to 18V) to the control circuitry, gate driver and
step-down 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.
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 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 4.2V 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.
Power Switching Output. Connect this pin to the underside Exposed Pad.
Output of error amplifier. Connect a series RC network from COMP to GND to compensate the
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.
Connecting FB with a resistor-divider from the output set the output voltage in the range from
0.8V to 90% VIN.
Power and Signal Ground.
Power Switching Output. LX is the Drain of the P-channel MOSFET to supply power to the
output. The Exposed Pad provides current with lower impedance than Pin 5. Connect the pad
to output LC filter via a top-layer thermal pad on PCBs. The PCB will be a heat sink of the IC.
VIN
VCC
FB
COMP
EN
4.2V Regulator
and
Power-On-Reset
VCC
POR
Current
Limit
118%VREF
70%VREF
OVP
UVP
Soft-Start
and
Fault Logic
Soft-Start
VREF
0.8V
Gm
Error
Amplifier
2.5V
0.8V
ENOK
Enable
Over
Temperature
Protection
Current Sense
Amplifier
Zero-Crossing
Comparator
Inhibit
Gate
Σ Control
Current
Comparator
Slope
Compensation
Oscillator
FB 380kHz
Gate
Driver
UG
VCC
Gate
Driver
LG
Linear
Regulator
VIN
UGND
LX
GND
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Nov., 2010
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet APW7070.PDF ] | |
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