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PDF FR9618 Data sheet ( Hoja de datos )

Número de pieza FR9618
Descripción 340KHz Synchronous Step-Down DC/DC Converter
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fitipower integrated technology lnc.
FR9618
23V, 3A, 340KHz Synchronous Step-Dow85nT
DC/DC Converter
Description
The FR9618 is a synchronous step-down DC/DC
converter that provides wide 4.5V to 23V input
voltage range and 3A continuous load current
capability.
The FR9618 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 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 FR9618 is available in an 8-pin SOIC package,
provides a very compact system solution and 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 Range: 0.925V to 20V
3A Output Current
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
<1μA Shutdown Current
SOP-8 Exposed Pad Package
Applications
Set-Top-Box (STB)
Television
Distributed Power System
XDSL Modem
Pin Assignments
SP Package (SOP-8 Exposed Pad)
BOOST
VIN
LX
GND
1
2
3
4
8
7
6
5
SS
SHDN
NC
FB
Ordering Information
FR9618□□□
TR: Tape/Reel
C: Green
Package Type
SP: SOP-8 (Exposed Pad)
Figure 1. Pin Assignment of FR9618
FR9618-1.1-OCT-2013
1

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FR9618 pdf
fitipower integrated technology lnc.
Electrical Characteristics
(VIN=12V, TA=25°C, unless otherwise specified.)
Parameter
Symbol
Conditions
VIN Input Supply Voltage
VIN
VIN Quiescent Current
VIN Shutdown Supply Current
Feedback Voltage
IDDQ
ISD
VFB
SH =1.8V, VFB=1.0V
SH =0V
4.5VVIN23V
Feedback OVP Threshold Voltage
VOVP
High-Side MOSFET RDS(ON) (Note3)
RDS(ON)
Low-Side MOSFET RDS(ON) (Note3)
RDS(ON)
High-Side MOSFET Leakage Current
ILX(leak)
SH =0V, VLX=0V
High-Side MOSFET Current Limit (Note3) ILIMIT(HS) Minimum Duty
Low-Side MOSFET Current Limit (Note3) ILIMIT(LS) From Drain to Source
Oscillation Frequency
FOSC
Short Circuit Oscillation Frequency
FOSC(short) VFB=0V
Maximum Duty Cycle
DMAX
VFB=0.8V
Minimum On Time (Note3)
TMIN
Input UVLO Threshold
Under Voltage Lockout
Hysteresis
VUVLO(Vth) VIN Rising
Threshold VUVLO(HYS)
Soft-Start Current
Soft-Start Period
ISS VSS=0V
TSS CSS=0.1μF
SH Input Low Voltage
SH (L
SH Input High Voltage
SH (H
SH Input Current
SH SH =2V
Thermal Shutdown Threshold (Note3)
TSD
Note 3Not production tested.
FR9618
85T
Min Typ Max Unit
4.5 23 V
2.5 mA
1 μA
0.9 0.925 0.95
V
1.5 V
110
80
10 μA
45
A
1.5 A
290 340 420 KHz
110 KHz
90 %
100 ns
4.3 V
250 mV
6 μA
15 ms
0.4 V
2V
2 μA
170 °C
FR9618-1.1-OCT-2013
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FR9618 arduino
fitipower integrated technology lnc.
Application Information (Continued)
FR9618
85T
T
R PPLE(ESR F SC L
ESL
R PPLE(ESL L ESL
1
T ESR
T
R PPLE(C 8 F SC2 L C T
1
T
Where FOSC is the switching frequency, L is the
inductance value, VIN is the input voltage, ESR is the
equivalent series resistance value of the output
capacitor, ESL is the equivalent series inductance
value of the output capacitor and the COUT is the
output capacitor.
Low ESR capacitors are preferred to use. Ceramic,
tantalum or low ESR electrolytic capacitors can be
used depending on the output ripple requirement.
When using the ceramic capacitors, the ESL
component is usually negligible.
It is important to use the proper method to eliminate
high frequency noise when measuring the output
ripple. The figure shows how to locate the probe
across the capacitor when measuring output ripple.
Removing the scope probe plastic jacket in order to
expose the ground at the tip of the probe. It gives a
very short connection from the probe ground to the
capacitor and eliminating noise.
Probe Ground
VOUT
GND
Ceramic Capacitor
Inductor Selection
The output inductor is used for storing energy and
filtering output ripple current. But the trade-off
condition often happens between maximum energy
storage and the physical size of the inductor. The
first consideration for selecting the output inductor is
to make sure that the inductance is large enough to
keep the converter in the continuous current mode.
That will lower ripple current and result in lower
output ripple voltage. The Δ L is inductor
peak-to-peak ripple current:
T
L F SC L
1
T
The following diagram is an example to graphical
represent Δ L equation.
1.4
L=6.8μ
1.2
1 L=8.2μ
L=10μ
0.8
0.6
0.4
0.2
5
8 11 14 17 20
VIN (V)
VOUT=3.3V, FOSC=340KHz
23
A good compromise value between size and
efficiency is to set the peak-to-peak inductor ripple
current Δ L equal to 30% of the maximum load
current. But setting the peak-to-peak inductor
ripple current Δ L between 20%~50% of the
maximum load current is also acceptable. Then
the inductance can be calculated with the following
equation:
L 0.3
T(MA
L
T
F SC
T
L
To guarantee sufficient output current, peak
inductor current must be lower than the FR9618
high-side MOSFET current limit. The peak
inductor current is as below:
PEAK
T(MA
L
2
IPEAK
IL
IOUT(MAX)
Time
FR9618-1.1-OCT-2013
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