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PDF FP6373A Data sheet ( Hoja de datos )
| Número de pieza | FP6373A | |
| Descripción | High Efficiency 1MHz 3A Synchronous Step Down Regulator | |
| Fabricantes | Fiti | |
| Logotipo |  |
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fitipower integrated technology lnc.
FP6373A
High Efficiency 1MHz853AT
Synchronous Step Down Regulator
Description
The FP6373A is a high-efficiency 1MHz synchronous
step-down DC-DC regulator and capable of
delivering output current up to 3A. The FP6373A
operates over wide input voltage range from 2.7V to
5.5V, and integrates main switch and synchronous
switch with very low RDS(ON) to minimize the
conduction loss.
Low output voltage ripple, small external inductor
and capacitor sizes are achieved with 1MHz
switching frequency.
Pin Assignments
S6 Package (SOT-23-6)
FB PG VIN
654
(Marking)
123
EN GND LX
Figure 1. Pin Assignment of FP6373A
Features
2.7V-5.5V Input Voltage Range
Adjustable Output Voltage Down to 0.6V
Low RDS(ON) for Internal Switch (Top/Bottom):
95/75mΩ
1MHz Switching Frequency Minimizes the
External Components
Internal Compensation Function
Internal Soft-Start Limits the Inrush Current
100% Dropout Operation
Power Good Indicator Output
RoHS Compliant and Halogen Free
Compact Package: SOT-23-6
Applications
Set Top Box
LCD TV
Tablet
Portable Equipment
Ordering Information
FP6373A□□□
TR: Tape/Reel
C: Green
Package Type
S6: SOT-23-6
SOT-23-6 Marking
Part Number
FP6373AS6C
Product Code
fiV
FP6373A-1.0-JUL-2013
1
1 page  
fitipower integrated technology lnc.
Electrical Characteristics
(VIN=5V, TA=25°C, unless otherwise specified.)
Parameter
Symbol
Input Voltage Range
VIN
Shutdown Current
ISD
Feedback Reference Voltage
VREF
FB Input Current
PFET RON
IFB
RDS(ON),P
NFET RON
RDS(ON),N
PFET Current Limit
EN Rising Threshold
ILIM
VENH
EN Falling Threshold
VENL
Input UVLO Threshold
VUVLO
UVLO Hysteresis
VHYS
Oscillation Frequency
FOSC
Minimum ON Time
Maximum Duty Cycle
PG Rising Threshold
PG Sink Current
VPG (H)
IPG
VOUT Discharge Resistance
Thermal Shutdown Temperature
Internal Soft Start Time
TSD
TSS
Conditions
EN=GND
VFB=VIN
IOUT=350mA
VFB Rising
VPG=0.1V
FP6373A
85T
Min Typ Max Unit
2.7 5.5 V
0.1 1 μA
0.591 0.6 0.609 V
-50
0.095
0.075
50
nA
Ω
Ω
4A
1.5 V
0.4 V
2.7 V
0.2 V
0.8 1 1.2 MHz
50 ns
100 %
90 %
1 mA
100 Ω
150 °C
1 ms
FP6373A-1.0-JUL-2013
5
5 Page 
fitipower integrated technology lnc.
Application Information (Continued)
FP6373A
85T
L(S
L ( SL
F SC L
SL
L SL
1
S
L (C
F SC2 L C
1
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 requirements.
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.
Remove 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 eliminates noise.
Probe Ground
That will lower ripple current and result in lower
output ripple voltage. The Δ L is inductor
peak-to-peak ripple current:
L F SC L 1
The following diagram is an example to graphically
represent Δ L equation.
1.2
1 L=1.2μH
0.8
L=1.8μH
0.6
0.4 L=2.2μH
0.2
0
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
VOUT=1.8V, FOSC=1MHz
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.
(MA
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.
L F SC L
To guarantee sufficient output current, peak inductor
current must be lower than the FP6373A high-side
MOSFET current limit. The peak inductor current
is shown as below:
L
A (MA 2
FP6373A-1.0-JUL-2013
11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FP6373A.PDF ] | |
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