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FR9886 Datasheet Preview

FR9886 Datasheet

340KHz Synchronous Step-Down DC/DC Converter

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fitipower integrated technology lnc.
FR9886
23V, 2.5A, 340KHz Synchronous Step-Do8w5nT
DC/DC Converter
Description
The FR9886 is a synchronous step-down DC/DC
converter that provides wide 4.5V to 23V input
voltage range and 2.5A continuous load current
capability.
The FR9886 fault protection includes cycle-by-cycle
current limit, UVLO, output overvoltage protection
and thermal shutdown. The adjustable soft-start
function prevents inrush current at turn-on. This
device uses current mode control scheme which
provides fast transient response. Internal
compensation function reduces external
compensation components and simplifies the design
process. In shutdown mode, the supply current is
less than 1μA.
The FR9886 is available in a SOP-8/SOP-8 exposed
pad package, and provides good thermal
conductance.
Features
● High Efficiency up to 96%
● Low Rds(on) Integrated Power MOSFET
Internal Compensation Function
● Wide Input Voltage Range: 4.5V to 23V
Adjustable Output Voltage from 0.925V to 20V
● 2.5A Output Current
● Fixed 340KHz Switching Frequency
● Current Mode Operation
● Adjustable Soft-Start
● Cycle-by-Cycle Current Limit
Over-Temperature Protection with Auto Recovery
Output Overvoltage Protection
Under Voltage Lockout
<1μA Shutdown Current
SOP-8 and SOP-8 Exposed Pad Packages
Applications
STB (Set-Top-Box)
LCD Display, TV
Distributed Power System
Networking, XDSL Modem
Pin Assignments
SO Package (SOP-8)
BOOST
VIN
LX
GND
1
2
3
4
8 SS
7 SHDN
6 NC
5 FB
SP Package (SOP-8 Exposed Pad)
BOOST
VIN
LX
GND
1
2
3
4
8
7
6
5
SS
SHDN
NC
FB
Figure 1. Pin Assignment of FR9886
Ordering Information
FR9886□□□
TR: Tape/Reel
G: Green
Package Type
SO: SOP-8
SP: SOP-8 (Exposed Pad)
FR9886-1.1-JAN-2012
1




fitipower integrated technology

FR9886 Datasheet Preview

FR9886 Datasheet

340KHz Synchronous Step-Down DC/DC Converter

No Preview Available !

fitipower integrated technology lnc.
Typical Application Circuit
R3
100k
C4
0.1μF
VIN
4.5V to 23V
C1
10μF/25V
CERAMIC x 2
71
SHDN BOOST
2 VIN
LX 3
FR9886
6 NC
FB 5
GND
4
SS
8
C3
0.1μF
FR9886
85T
L1
4.7μH
R1
3k
C6
(optional)
VOUT
1.2V
C2
22μF/6.3V
CERAMIC x 2
R2
10k
Figure 2. CIN /COUT use Ceramic Capacitors Application Circuit
VIN
4.5V to 23V
R3
100k
C4
0.1μF
C1
100μF/25V
EC x 1
C5
0.1μF/25V
CERAMIC x 1
71
SHDN BOOST
2
VIN
LX 3
FR9886
6 NC
FB 5
GND
4
SS
8
C3
0.1μF
L1
4.7μH
R1
3k
C6
(optional)
VOUT
1.2V
C2
100μF/6.3V
EC x 1
R2
10k
VOUT
1.2V
1.8V
2.5V
3.3V
5V
1.2V
1.8V
2.5V
3.3V
5V
Figure 3. CIN /COUT use Electrolytic Capacitors Application Circuit
R1
3k
9.53k
16.9k
26.1k
44.2k
3k
9.53k
16.9k
26.1k
44.2k
R2
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
C6
10pF~1nF
10pF~1nF
10pF~1nF
10pF~1nF
10pF~1nF
--
--
--
--
--
L1
4.7μH
4.7μH
10μH
10μH
10μH
4.7μH
4.7μH
10μH
10μH
10μH
Table 1. Recommended Component Values
COUT
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
100μF EC x1
100μF EC x1
100μF EC x1
100μF EC x1
100μF EC x1
FR9886-1.1-JAN-2012
2


Part Number FR9886
Description 340KHz Synchronous Step-Down DC/DC Converter
Maker fitipower integrated technology
Total Page 14 Pages
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