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FR9889 Datasheet Preview

FR9889 Datasheet

340KHz Synchronous Step-Down DC/DC Converter

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FR9889
23V, 3A, 340KHz Synchronous Step-Down
DC/DC Converter
Description
The FR9889 is a synchronous step-down DC/DC
converter that provides wide 4.5V to 23V input
voltage range and 3A continuous load current
capability. At light load condition, the FR9889 can
operate at power saving mode to support high
efficiency and reduce power lose.
The FR9889 fault protection includes cycle-by-cycle
current limit, UVLO, output overvoltage protection
and thermal shutdown. The 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 about 1µA.
The FR9889 is available in a SOP-8 exposed pad
package, which provides good thermal
conductance.
Pin Assignments
SP Package (SOP-8 Exposed Pad)
Features
Low RDS(ON) Integrated Power MOSFET
(120mΩ /100mΩ)
Internal Compensation Function
Internal Power Good Function
Wide Input Voltage Range: 4.5V to 23V
Adjustable Output Voltage Down to 0.925V
3A Output Current
340kHz Switching Frequency
External Programmable Soft-Start or Internal
600µs Soft-Start
Cycle-by-Cycle Current Limit
Over-Temperature Protection with Auto Recovery
OVP, UVLO
Hiccup Short Circuit Protection
SOP-8 Exposed Pad Package
Applications
STB (Set-Top-Box)
LCD Display, TV
Distributed Power System
Networking, XDSL Modem
Ordering Information
FR9889□□□
TR: Tape/Reel
C: Green
Package Type
SP: SOP-8 (Exposed Pad)
Figure 1. Pin Assignment of FR9889
FR9889-1.1-MAY-2016
1




Fiti

FR9889 Datasheet Preview

FR9889 Datasheet

340KHz Synchronous Step-Down DC/DC Converter

No Preview Available !

Typical Application Circuit
FR9889
Figure 2. CIN /COUT use Ceramic Capacitors Application Circuit
Figure 3. CIN/COUT use Electrolytic Capacitors Application Circuit
VIN=12V, the recommended BOM list is as below.
VOUT
R1
R2
1.2V
3kΩ 10kΩ
1.8V
9.53kΩ
10kΩ
2.5V
16.9kΩ
10kΩ
3.3V
26.1kΩ
10kΩ
5V
44.2kΩ
10kΩ
1.2V
3kΩ 10kΩ
1.8V
9.53kΩ
10kΩ
2.5V
16.9kΩ
10kΩ
3.3V
26.1kΩ
10kΩ
5V
44.2kΩ
10kΩ
C6
10pF~10nF
10pF~10nF
10pF~10nF
10pF~10nF
10pF~10nF
--
--
--
--
--
Table 1. Recommended Component Values
L1
4.7µH
4.7µH
6.8µH
10µH
10µH
4.7µH
4.7µH
6.8µH
10µH
10µH
FR9889-1.1-MAY-2016
C2
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
2


Part Number FR9889
Description 340KHz Synchronous Step-Down DC/DC Converter
Maker Fiti
Total Page 13 Pages
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