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PDF FP6375 Data sheet ( Hoja de datos )
| Número de pieza | FP6375 | |
| Descripción | High Efficiency 1MHz 2.5A Synchronous Step Down Regulator | |
| Fabricantes | Fiti | |
| Logotipo |  |
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fitipower integrated technology lnc.
FP6375
High Efficiency 1MHz 28.55AT
Synchronous Step Down Regulator
Description
The FP6375 is a high-efficiency 1MHz synchronous
step-down DC-DC regulator and capable of
delivering output current up to 2.5A. The FP6375
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
S5 Package (SOT-23-5)
FB VIN
54
(Marking)
123
EN GND LX
Figure 1. Pin Assignment of FP6375
Features
High Efficiency up to 96%
Low RDS(ON) for Internal Switch (Top/Bottom):
95/75mΩ
2.7V-5.5V Input Voltage Range
Adjustable Output Voltage Down to 0.6V
1MHz Switching Frequency Minimizes the
External Components
Internal Compensation Function
Internal Soft-Start Limits the Inrush Current
100% Dropout Operation
RoHS Compliant and Halogen Free
Compact Package: SOT-23-5
Applications
Set Top Box
LCD TV
Tablet
Portable Equipment
Ordering Information
FP6375□□□
TR: Tape/Reel
C: Green
Package Type
S5: SOT-23-5
SOT-23-5 Marking
Part Number
FP6375S5C
Product Code
E8G
FP6375-1.0-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
IFB
PFET RON
RDS(ON),P
NFET RON
RDS(ON),N
PFET Current Limit
ILIM
EN Rising Threshold
VENH
EN Falling Threshold
VENL
Input UVLO Threshold
VUVLO
UVLO Hysteresis
VHYS
Oscillation Frequency
FOSC
Minimum ON Time
Maximum Duty Cycle
VOUT Discharge Resistance
Thermal Shutdown Temperature
TSD
Internal Soft Start Time
TSS
Conditions
EN=GND
VFB=VIN
IOUT=350mA
FP6375
85T
Min Typ Max Unit
2.7 5.5 V
0.1 1 μA
0.588 0.6 0.612 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 %
100 Ω
150 °C
1 ms
FP6375-1.0-JUL-2013
5
5 Page 
fitipower integrated technology lnc.
Application Information (Continued)
FP6375
85T
PPL ( S ) F SC L
SL
PPL ( SL) L SL
1
S
PPL (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 FP6375 high-side
MOSFET current limit. The peak inductor current
is shown as below:
L
P A (MA ) 2
FP6375-1.0-JUL-2013
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FP6375.PDF ] | |
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