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PDF APW7083 Data sheet ( Hoja de datos )
| Número de pieza | APW7083 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7083
5A, 26V, 380kHz, Synchronous Step-Down Converter
Features
General Description
• Wide Input Voltage from 4.5V to 26V
• Output Current Up to 5A
•
Adjustable Output Voltage from 0.8V to 90%V
IN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
• Integrated 50mΩ P-Channel Power MOSFET and
20mΩ N-Channel Power MOSFET
• High Efficiency up to 95%
• 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
• 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 TQFN5x6-28 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 5A Output Current
The APW7083 is a 5A, synchronous, step-down converter
with integrated 50mΩ P-channel power MOSFET and
20mΩ N-channel power MOSFET. The device, with cur-
rent-mode control scheme, can convert 4.5~26V input volt-
age to the output voltage adjustable from 0.8 to 90% VIN to
provide excellent output voltage regulation.
The APW7083 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 APW7083 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 shutdown mode, the supply
current drops below 5µA.
This device, available in 28-pin TQFN5x6 package, pro-
vides a very compact system solution with minimal exter-
nal components and good thermal conductance.
Simplified Application Circuit
C1
10µF
VIN
4.5V~26V
C3
1µF
R5
100kΩ
VIN
VIN
VCC UGND
LX
U1 ZCS
APW7083
EN PGND
COMP FB
R4 GND
R2
C6 1%
C5
C2
1µF L1
5A
R1
1%
C7
(Optional)
VOUT
0.8V~90%VIN, 5A
C4
22µF
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.5 - Sep., 2011
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APW7083
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
CURRENT-MODE PWM CONVERTER (CONT.)
Current-Sense Resistance
High-side Switch Resistance
Low-side Switch Resistance
PROTECTIONS
Between VIN and Exposed Pad,
TJ = 25oC
Between GND and Exposed Pad,
TJ = 25oC
ILIM
P-Channel Power MOSFET
Current-Limit
Peak Current
VUV FB Under-Voltage Threshold
VFB falling
FB Under-Voltage Hysteresis
FB Under-Voltage Debounce
VOV FB Over-Voltage Threshold
VFB Rising
FB Over-Voltage Hysteresis
TOTP Over-Temperature Trip Point
Over-Temperature Hysteresis
TD Dead-Time
VLX = -0.7V, VIN = 4.5 ~ 26V
SOFT-START, ENABLE, AND INPUT CURRENTS
tSS Soft-Start Interval
Preceding Delay before Soft-Start
EN Logic Low Voltage
VEN falling, VIN = 4.5 ~ 26V
EN Logic High Voltage
VEN rising, VIN = 4.5 ~ 26V
EN Pin Clamped Voltage
IEN = 10mA
P-Channel Power MOSFET Leakage
Current
VEN = 0V, VLX = 0V, VIN = 26V
IFB FB Pin Input Current
VFB = 0.8V
IEN EN Pin Input Current
VEN < 3V
APW7083
Min.
Typ.
Max.
Unit
- 0.12 -
Ω
- 50 80 mΩ
- 20 30 mΩ
6 8 10 A
66 70 74 %
- 40 - mV
- 2 - µs
114 118 122 %
- 40 - mV
- 150 - oC
- 50 - oC
- 30 - ns
- 8 - ms
- 11 - ms
- - 0.5 V
2.1 -
-V
12 - 17 V
- - 4 µA
-100
-
+100
µA
-500
-
+500
µA
Copyright © ANPEC Electronics Corp.
Rev. A.5 - Sep., 2011
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7083
Pin Description
PIN
NO. NAME
1 FB
2
3
4~7, 22
8~20
21, 23, 24
COMP
ZCS
PGND
LX
VIN
25 EN
26 UGND
27 VCC
28 GND
Block Diagram
FUNCTION
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.
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.
Zero-Crossing Sense pin. Please externally connect this pin with LX.
POWER Ground pins. All these pins must be connected externally to the power ground plane.
Power Switching Output. Connect this pin to the underside Exposed Pad.
Power Input. VIN supplies the power (4.5V to 26V) 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 start-up.
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.
Signal Ground.
VIN
VCC
FB
COMP
EN
GND
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
Control
Current
Compartor
Slope
Compensation
Oscillator
FB 380kHz
Gate
Driver
UG
VCC
Gate
Driver
LG
Linear
Regulator
VIN
ZCS
UGND
LX
PGND
Copyright © ANPEC Electronics Corp.
Rev. A.5 - Sep., 2011
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet APW7083.PDF ] | |
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