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PDF APW7334 Data sheet ( Hoja de datos )
| Número de pieza | APW7334 | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7334
2A 24V 340kHz synchronous Buck Converter
Features
General Description
• Wide Input Voltage from 4.5V to 24V
APW7334 is a 2A synchronous buck converter with inte-
• 2A Continuous Output Current
grated power MOSFETs. The APW7334 design with a cur-
• Adjustable Output Voltage from 0.8V to 20V
rent-mode control scheme, can convert wide input volt-
• Intergrated High/Low Side MOSFET
age of 4.5V to 24V to the output voltage adjustable from
• PFM/PWM mode Operation
• Fixed 340kHz Switching Frequency
0.8V to 20V to provide excellent output voltage regulation.
The APW7334 is equipped with an automatic PFM/PWM
mode operation. At light load, the IC operates in the PFM
• Stable with Low ESR Ceramic Output Capacitors mode to reduce the switching losses. At heavy load, the
• Power-On-Reset Detection
IC works in PWM.
• Programmable Soft-Start
The APW7334 is also equipped with Power-on-reset, soft-
• Over-Temperature Protection
start, soft-stop, and whole protections (under-voltage,
• Current-Limit Protection with Frequency Foldback over-temperature, and current-limit) into a single package.
• Enable/Shutdown Function
This device, available SOP-8 , provides a very compact
• Small SOP-8 Package
system solution external components and PCB area.
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
Pin Configuration
• LCD Monitor/TV
• Set-Top Box
• DSL, Switch HUB
• Notebook Computer
Simplified Application Circuit
VIN
BS 1
VIN 2
LX 3
GND 4
APW7334
SOP-8
(Top View)
8 SS
7 EN
6 COMP
5 FB
APW7334
VOUT
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.2 - Dec., 2012
1
www.anpec.com.tw
1 page  
APW7334
Pin Description
PIN
SOP-8
NAME
FUNCTION
1
BS
High-Side Gate Drive Boost Input. BS supplies the voltage to drive the high-side N-channel MOSFET.
At least 10nF capacitor should be connected from LX to BS to supply the high side switch.
Power Input. VIN supplies the power (4.5V to 24V) to the control circuitry, gate drivers and step-down
2 VIN converter switches. 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.
3
LX
Power Switching Output. LX is the Drain of the N-Channel power MOSFET to supply power to the
output LC filter.
4
GND
Ground.
Output feedback Input. The APW7334 senses the feedback voltage via FB and regulates the voltage
5 FB at 0.8V. Connecting FB with a resistor-divider from the converter’s output sets the output voltage from
0.8V to 20V.
6
COMP
Output of the 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.
7
EN
Enable Input. EN is a digital input that turns the regulator on or off. EN threshold is 2.5V with 0.2V
hysteresis. Pull up with 100kΩ resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set
8 SS the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft-start
feature, leave SS unconnected.
Block Diagram
VIN
2
Over
Temperature
Protection
Power-On-
Reset
LOC
Current
Limit
Current Sense
Amplifier
5V
SS 8
5V
6µA
OTP
POR
120%VREF
OVP
Fault
Logics
Inhibit
Gate
Control
FB 5
COMP 6
EN 7
VREF
Gm
Error
Amplifier
Current
Compartor
2.5/2.3V
1.5V
UVLO
Enable
VIN
Internal
Regulator
Slope
Compensation
Oscillator
5V 340kHz/
110kHz
Gate
Driver
5V
Gate
Driver
LOC
FB
0.6V
Current Sense
Amplifier
1 BS
3 LX
4 GND
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Dec., 2012
5
www.anpec.com.tw
5 Page 
APW7334
Package Information
SOP-8
D
SEE VIEW A
eb
°
c
NX
aaa C
L
VIEW A
GAUGE PLANE
SEATING PLANE
S SOP-8
Y
M
B
MILLIMETERS
INCHES
O
L
MIN.
MAX.
MIN.
MAX.
A 1.75
0.069
A1 0.10
A2 1.25
0.25
0.004
0.049
0.010
b 0.31
0.51
0.012
0.020
c 0.17
0.25
0.007
0.010
D 4.80
E 5.80
E1 3.80
5.00
6.20
4.00
0.189
0.228
0.150
0.197
0.244
0.157
e 1.27 BSC
h 0.25
0.50
0.050 BSC
0.010
0.020
L 0.40
1.27
0.016
0.050
0 0°
8°
aaa 0.10
0° 8°
0.004
Note: 1. Follow JEDEC MS-012 AA.
2. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion or gate burrs shall not exceed 6 mil per side.
3. Dimension “E” does not include inter-lead flash or protrusions.
Inter-lead flash and protrusions shall not exceed 10 mil per side.
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Dec., 2012
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet APW7334.PDF ] | |
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