Step-Down Converter. AF5030S Datasheet

AF5030S Converter. Datasheet pdf. Equivalent

AF5030S Datasheet
Recommendation AF5030S Datasheet
Part AF5030S
Description 1.5A Synchronous Step-Down Converter
Feature AF5030S; AF5030S 1.5A Synchronous Step-Down Converter DESCRIPTION The AF5030S is a monolithic synchronous buc.
Manufacture AFSEMI
Datasheet
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AFSEMI AF5030S
AF5030S
1.5A Synchronous Step-Down Converter
DESCRIPTION
The AF5030S is a monolithic synchronous buck regulator. The device can provides 1.5A of
continuous load current over a wide input voltage of 4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the supply current
drops to 0.3μA.
FEATURES
1.5A Output Current
Wide 4.75V to 23V Operating Voltage
Integrated 130mΩ Power MOSFET Switches
Output Adjustable from 0.925V to 0.8*VIN
Up to 95% Efficiency
Programmable Soft-Start
SOP-8 Package
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
TYPICAL APPLICATION
Note: All of the optional components
could be added when you need them.
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AFSEMI AF5030S
PACKAGE REFERENCE
AF5030S
PIN FUNCTIONS
PIN NO.
1
2
3
4
5
6
7
8
Name
BS
IN
SW
GND
FB
COMP
EN
SS
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the
high-side N-Channel MOSFET switch. Connect a 0.01μF or greater
capacitor from SW to BS to power the high side switch.
Power Input. Drive IN with a 4.75V to 23V power source. Bypass IN
to GND with a suitably large capacitor to eliminate noise on the input
to the IC.
Power Switching Output. SW is the switching node that supplies
power to the output. Connect the output LC filter from SW to the
output load.
Ground.
Feedback Input. FB senses the output voltage to regulate that
voltage. Drive FB with a resistive voltage divider from the output
voltage. The feedback threshold is 0.925V.
Compensation Node. COMP is used to compensate the regulation
control loop. 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.
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.
Soft-Start Control Input. SS controls the soft start period. Connect a
capacitor from SS to GND to set the soft-start period. A 0.1μF
capacitor sets the soft-start period to 15ms. To disable the
soft-start feature, SS unconnected the Capacitor.
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AFSEMI AF5030S
AF5030S
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VIN ...............................................................................-0.3V to +26V
Switch Node Voltage VSW .................................................................................... 27V
Boost Voltage VBS .................................................................VSW–0.3V to VSW + 6V
All Other Pins...........................................................................................-0.3V to +6V
Junction Temperature ..................................................................................... +150°C
Lead Temperature .................................................................................... +260°C/10s
Storage Temperature .................................................................... –65°C to + 150°C
RECOMMENDED OPERATING CONDITIONS
Input Voltage (VIN) ............................................................................... 4.75V to 23V
Output Voltage (VSW) ............................................................................ 0.925 to 20V
Operating Temperature.......................................................................–40°C to +85°C
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = +25°C, unless otherwise noted.)
Parameter
Symbol
Condition
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Overvoltage Threshold
ISD
IQ
VFB
VFB_OVP
VEN ≤ 0.3V
VEN ≥ 2.6V, VFB = 1.0V
4.75V ≤ VIN ≤ 23V
Error Amplifier Voltage
AEA
Error Amplifier Transconductance
High-Side Switch On Resistance
GEA
RDS(ON)-1
ΔIC = ±10μA
Low-Side Switch On Resistance
RDS(ON)-2
High-Side Switch Leakage Current
VEN = 0V, VSW = 0V
Upper Switch Current Limit
Minimum Duty Cycle
Lower Switch Current Limit
From Drain to Source
COMP to Current Sense
Transconductance
GCOMP
Oscillation Frequency
Fsw
Short Circuit Oscillation Frequency
Fosc2
VFB = 0V
Maximum Duty Cycle
DMAX
VFB = 1.0V
EN Shutdown Threshold Voltage
VEN Rising
EN Shutdown Threshold Voltage
Hysteresis
EN Lockout Threshold Voltage
EN Lockout Hysterisis
Input Under Voltage Lockout
Threshold
VIN Rising
Input Under Voltage Lockout
Threshold Hysteresis
MIN
0.900
2.4
350
1.1
2.2
3.80
TYP
0.3
1.3
0.925
1.1
400
820
130
130
3.4
1.1
3.5
400
140
90
1.5
210
2.5
210
4.20
210
MAX
3.0
1.5
0.950
10
--
450
2.0
2.7
4.40
Units
uA
mA
V
V
V/V
uA/V
uA
A
A
A/V
Khz
Khz
%
V
mV
V
mV
V
mV
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