DC-DC Converter. AF2304 Datasheet

AF2304 Converter. Datasheet pdf. Equivalent

AF2304 Datasheet
Recommendation AF2304 Datasheet
Part AF2304
Description Synchronous Step-Up DC-DC Converter
Feature AF2304; AF2304 300KHZ, PFM Control, Synchronous Step-Up DC-DC Converter General Description The AF2304 Ser.
Manufacture AFSEMI
Datasheet
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AFSEMI AF2304
AF2304
300KHZ, PFM Control, Synchronous Step-Up DC-DC Converter
General Description
The AF2304 Series is a Synchronous
step-up DC/DC Converter with PFM
Control.
With the AF2304 Series, a step-up
switching DC/DC converter can be
configured by using an external coil,
capacitor. The built-in MOSFET is
turned off by a protection circuit when
the voltage at the LX pin exceeds the
limit to prevent it from being damaged.
Features
External parts: Coil, Capacitor
Output voltage: Settable to
between 2.1V to 5.5V in 0.1V steps
Maximum Oscillation frequency :
300KHz
Accuracy of ±2%
High efficiency :95%
Package:
SOT23, SOT23-3 and SOT89
Applications
Digital cameras
Electronic notebooks and PDAs
Portable CD/MD players
Cameras , video equipment
Communications equipment
Power supply for microcomputers
Typical Application
Note: External Component Recommendation:
1) Coil value:47uH(Sumida)
2) Capacitor value:47uF/16V(Tantalum)
AF-V3.0
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AFSEMI AF2304
Order Information
AF2304①②③④
Designator
①②
Symbol
Integer
P
M
N
R
G
Description
Output Voltage
(2.1~5.5) e.g:3.0V=①:3;②:0
Package:SOT89
Package:SOT23-3
Package:SOT23
RoHS / Pb Free
Halogen Free
Pin Assignment
AF2304
AF-V3.0
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AFSEMI AF2304
AF2304
Absolute Maximum Ratings
(Unless otherwise specified, Ta=25)
PARAMETER
VOUT Pin Voltage
SYMBOL
VOUT
RATINGS
VSS-0.3~VSS+8
UNITS
V
EN Pin Voltage
LX Pin Voltage
EN VSS-0.3~VSS+8
VLX VSS-0.3~VSS+8
V
V
LX Pin Current
ILX 1000
mA
Power
SOT23/SOT23-3
Dissipation
SOT89
Operating Temperature
PD
TOPR
250
500
-40~+85
mW
mW
Storage Temperature
TSTG
-40~+125
Soldering Temperature & Time
TSOLDER
260℃,10s
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings” may cause
substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the
specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Electrical Characteristics
(Unless otherwise specifiedTa = 25)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CONDITION
Output Voltage
VOUT
VOUT(S)
VOUT(S)
VOUT
X0.98
X1.02
V
-
Input Voltage
Operation Start Voltage
Input Current At No Load
Current Consumption 2
Current Consumption
During Shutdown
Maximum Oscillation
Frequency
VIN
VST1
ISS
ISS2
ISSS
fosc
- - 7.5 V
- - 0.9 V
- 15 -
uA
- 6 10 uA
- - 1.0 uA
-
IOUT=1mA
VIN=1.8V, VOUT=3.0V
VOUT=VOUT(s)+0.5V
VEN=0V
VOUT=0.95xVOUT(s), measure
300 KHz
Waveform at LX pin
Duty Ratio1
Duty1 70 78 85
%
VOUT=0.95xVOUT(s)
Efficiency
EFF1
90
%
Shutdown Pin Input
VSH
0.75
-
-
VOUT=0.95xVOUT(s), judge
V
Oscillation at LX pin
Voltage
VSL1
-
- 0.3
VOUT=0.95xVOUT(s), judge
V
stop at LX pin
Shutdown Pin input
ISH -0.1 - 0.1 uA
VEN=6V
Current
ISL -0.1 - 0.1 uA
VEN=0V
Remark: VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output
voltage.
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AF-V3.0
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