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FR9888 Datasheet PDF - Fiti

Part Number FR9888
Description 340KHz Synchronous Step-Down DC/DC Converter
Manufacturers Fiti 
Logo Fiti Logo 



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FR9888 datasheet, circuit
fitipower integrated technology lnc.
FR9888
23V, 3A, 340KHz Synchronous Step-Down
DC/DC Converter
Description
The FR9888 is a synchronous step-down DC/DC
converter that provides wide 4.5V to 23V input
voltage range and 3A continuous load current
capability.
Fault protection includes cycle-by-cycle current limit,
input UVLO, output over voltage protection and
thermal shutdown. Besides, adjustable soft-start
function prevents inrush current at turn-on. This
device uses current mode control scheme that
provides fast transient response. In shutdown mode,
the supply current is about 1uA.
The FR9888 is available in an 8-pin SOIC package,
provides a very compact system solution and good
thermal conductance.
Features
Wide Input Voltage from 4.5V to 23V
3A Output Current
Adjustable Output Voltage from 0.925V to 14V
Low Rds(on) integrated Power MOSFET
High Efficiency Up to 93%
Fixed 340KHz Switching Frequency
Current Mode Operation
Adjustable Soft-Start
Cycle-by-Cycle current limit
Input Under Voltage Lockout
Over-Temperature Protection With Auto
Recovery
1uA Shutdown Current
Internal Compensation Function
SOP-8 and Thermal Enhanced SOP-8P
Packages
RoHS Compliant
Applications
Set-Top-Box
DVD,LCD Displays
OLPC, Netbook
Datacom, XDSL
Pin Assignments
SP Package (SOP- 8 Expose pad )
Figure 1. Pin Assignment of FR9888
Ordering Information
FR9888□□□
TR: Tape / Reel
G: Green
Package Type
SP: SOP-8(Exposed Pad)
FR9888-0.1-OCT-2010
1
Free Datasheet http://www.datasheet4u.net/

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FR9888 equivalent
fitipower integrated technology lnc.
FR9888
Electrical Characteristics
(VIN=12V, TA=25, unless otherwise specified.)
Parameter
Conditions
VIN Input Supply Voltage (Note2)
VIN Supply Current
VIN Shutdown Supply Current
Feedback Voltage
Feedback OVP Threshold Voltage
High-Side MOSFET RDS(ON) (Note3)
Low-Side MOSFET RDS(ON) (Note3)
High-Side MOSFET Leakage Current
High-Side MOSFET Current Limit (Note3)
Low-Side MOSFET Current Limit (Note3)
Error Amplifier Voltage Gain (Note3)
Oscillation frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time (Note3)
Input UVLO Threshold
VEN = 1.8V
VEN = 0V
4.5VVIN18V
VEN = 0V, VSW = 0V
Minimum Duty
VFB = 0V
VFB = 0.8V
VIN Rising
Under Voltage Lockout Threshold Hysteresis
Soft-Start Current
Soft-Start Period
CSS = 0.1uF
EN Input Low Voltage
EN Input High Voltage
EN Input Current
Thermal Shutdown Threshold (Note3)
VEN = 2V
Note2When VIN = 4.5V, VOUT = 3.3V, maximum load current is about 1A.
Note3Not production tested.
Min Typ Max
4.5 23
1.1
1
0.9 0.925 0.95
1.5
130
100
10
45
3
400
280 340 380
110
90
220
4.4
300
6
15
0.4
2
2
160
Unit
V
mA
µA
V
V
m
m
uA
A
A
V/V
KHz
KHz
%
ns
V
mV
uA
ms
V
V
uA
Function Description
FR9888-0.1-OCT-2010
5
Free Datasheet http://www.datasheet4u.net/

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Information Total 11 Pages
Download[ FR9888.PDF Datasheet ]

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