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FR9884 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 FR9884
기능 340KHz Synchronous Step-Down DC/DC Converter
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FR9884 데이터시트, 핀배열, 회로
fitipower integrated technology lnc.
FR9884
18V, 3A, 340KHz Synchronous Step-Do8w5nT
DC/DC Converter
Description
The FR9884 is a synchronous step-down DC/DC
converter that provides wide 4.5V to 18V 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 10μA.
The FR9884 is available in an 8-pin SOIC package,
which provides a very compact system solution and
good thermal conductance.
Features
Wide Input Voltage from 4.5V to 18V
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
● 10μA Shutdown Current
Thermal Enhanced SOP-8 (Exposed Pad) Package
● RoHS Compliant
Applications
Set-Top-Box
DVD,LCD Display
OLPC, Netbook
● Distributed Power System
Datacom, XDSL
Pin Assignments
SP Package (SOP-8 Exposed Pad)
BS
VIN
SW
GND
1
2
3
4
8 SS
7 EN
6 COMP
5 FB
Figure 1. Pin Assignment of FR9884
Ordering Information
FR9884□□□
TR: Tape / Reel
G: Green
Package Type
SP: SOP-8 (Exposed Pad)
FR9884-1.7-DEC-2011
1
FR9884 pdf, 반도체, 판매, 대치품
fitipower integrated technology lnc.
FR9884
Absolute Maximum Ratings
85T
Input Supply Voltage VIN --------------------------------------------------------------------------------- -0.3V to +21V
SW Voltage VSW -------------------------------------------------------------------------------------------- -1V to VIN +0.3V
Boost Trap Voltage VBS ----------------------------------------------------------------------------------- Vsw -0.3V to Vsw +6V
All Other Pins Voltage ------------------------------------------------------------------------------------ -0.3V to +6V
Maximum Junction Temperature (TJ) ----------------------------------------------------------------- +150°C
Storage Temperature (TS) ------------------------------------------------------------------------------- -65°C to +150°C
Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------- +260°C
Power Dissipation @TA=25°C, (PD)
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 1.25W
● Package Thermal Resistance, (θJA):
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 50°C/W
● Package Thermal Resistance, (θJC):
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 15°C/W
Note 1Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.
Recommended Operating Conditions
Input Supply Voltage (VIN) ------------------------------------------------------------------------------- +4.5V to +18V
Output Voltage (VOUT) ------------------------------------------------------------------------------------- +0.925V to +14V
Operation Temperature Range ------------------------------------------------------------------------- -40°C to +85°C
FR9884-1.7-DEC-2011
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FR9884 전자부품, 판매, 대치품
fitipower integrated technology lnc.
FR9884
Typical Performance Curves (Continued)
85T
VIN = 12V, VOUT = 3.3V, C1 =10μF x 1, C6=100μF x 1, C2 = 22μF x 2, L1 = 10μH, TA = +25°C, unless otherwise noted.
IOUT=0A
IOUT=3A
VIN 50mV/div.
VOUT 20mV/div.
IL 1A/div.
VSW 5V/div.
VIN 500mV/div.
VOUT 20mV/div.
IL 1A/div.
4μs/div.
Figure 11. DC Ripple Waveform
IOUT=0.1A
VEN, 5V/div.
VOUT 1V/div.
IL 2A/div.
VSW 5V/div.
4ms/div.
Figure 13. Startup Through Enable Waveform
IOUT=0.1A
VEN, 5V/div.
VSW 5V/div.
4μs/div.
Figure 12. DC Ripple Waveform
IOUT=3A
VEN, 5V/div.
VOUT 1V/div.
IL 2A/div.
VSW 5V/div.
4ms/div.
Figure 14. Startup Through Enable Waveform
IOUT=3A
VEN, 5V/div.
VOUT 1V/div.
IL 2A/div.
VSW 5V/div.
2ms/div.
Figure 15. Shutdown Through Enable Waveform
FR9884-1.7-DEC-2011
VOUT 1V/div.
IL 2A/div.
VSW 5V/div.
2ms/div.
Figure 16. Shutdown Through Enable Waveform
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340KHz Synchronous Step-Down DC/DC Converter

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FR9884

340KHz Synchronous Step-Down DC/DC Converter

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