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PDF FP6381A Data sheet ( Hoja de datos )
| Número de pieza | FP6381A | |
| Descripción | High Efficiency 1.5MHz 1.2A Synchronous Step Down Regulator | |
| Fabricantes | Fiti | |
| Logotipo |  |
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fitipower integrated technology lnc.
FP6381A
High Efficiency 1.5MHz/a18.52AT
Synchronous Step Down Regulator
Description
The FP6381A is a high efficiency, high frequency
synchronous DC-DC step-down converter. The
100% duty cycle feature provides low dropout
operation, extending battery life in portable systems.
The internal synchronous switch increases efficiency
and eliminates the need for external Schottky diode.
At shutdown mode, the input supply current is less
than 1µA.
The current limit protection and on-chip thermal
shutdown features provide protection against any
combination of overload or ambient temperature.
Pin Assignments
S5 Package (SOT-23-5)
FB
VIN
54
1 23
EN GND LX
S6 Package (SOT-23-6)
FB PG VIN
6 54
1 23
EN GND LX
S8 Package (TSOT-23-5)
FB VIN
54
1 23
Features
Low RDS(ON) for Internal Switch (Top/Bottom):
300/250mΩ
2.5V~5.5V Input Voltage Range
1.2A Output Current
1.5MHz Switching Frequency Minimizes the
External Components
Internal Soft-start Limits the Inrush Current
Internal Compensation Function
100% Dropout Operation
Power Good Indicator Output (SOT-23-6 only)
RoHS Compliant and Halogen Free
SOT-23-5 and SOT-23-6 Packages
Applications
Set Top Box
LCD TV
Tablet
Portable Equipment
Ordering Information
FP6381A□□□
TR: Tape/Reel
C: Green
Package Type
S5: SOT-23-5
S6: SOT-23-6
S8: TSOT-23-5
SOT-23-5 Marking
Part Number
FP6381AS5CTR
Product Code
FA2
SOT-23-6 Marking
Part Number
FP6381AS6CTR
Product Code
FC4
TSOT-23-5 Marking
Part Number
Product Code
FP6381AS8CTR
FF5
EN GND LX
Figure 1. Pin Assignment of FP6381A
FP6381A-0.3-DEC-2013
1
1 page  
fitipower integrated technology lnc.
Electrical Characteristics
(VIN=5V, VOUT=2.5V, TA=25°C, unless otherwise specified.)
Parameter
Symbol
Conditions
Shutdown Current
ISHDN
EN=0V
Quiescent Current
Iq VFB=0.65V, IOUT=0A
Reference Voltage
VREF
FB Input Leakage Current
P-Channel MOSFET On-Resistance
(Note 3)
N-Channel MOSFET On-Resistance
(Note 3)
P-Channel Current Limit (Note 3)
EN High-Level Input Voltage
IFB
RDS(ON)
RDS(ON)
ILIM
VIH
VFB=VIN
EN Low-Level Input Voltage
VIL
Under Voltage Lockout Voltage
UVLO
UVLO Hysteresis
VHYS
Oscillation Frequency
FOSC
IOUT=200mA
Minimum On Time
Maximum Duty Cycle
PG Rising Threshold
PG Sink Current
LX Discharge Resistance
VPG (H)
IPG
VFB Rising
VPG=0.1V
Thermal Shutdown Temperature (Note 3)
TSD
Internal Soft Start Time
Note 3：Guarantee by design.
TSS
FP6381A
/a85T
Min Typ Max Unit
0.1 1 μA
80 μA
0.588 0.6 0.612 V
0.01 1
300
250
µA
mΩ
mΩ
1.6 A
1.5 V
0.4 V
2.4 V
0.2 V
1.2 1.5 1.8 MHz
50 ns
100 %
90 %
1 mA
100 Ω
150 °C
1 ms
FP6381A-0.3-DEC-2013
5
5 Page 
fitipower integrated technology lnc.
Application Information (Continued)
FP6381A
/a85T
R PPL
(
SR = F
T
SC L
1
T
SR
R PPL
(
SL
=
SL
L+ SL
R PPL (C =
T
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 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
T
SC L
1
T
The following diagram is an example to graphically
represent Δ L equation.
0.9
0.8 L=1μH
0.7
0.6
0.5 L=1.5μH
0.4 L=2.2μH
0.3
0.2
0.1
0
2.5 3 3.5 4 4.5 5
VIN (V)
VOUT=1.2V, FOSC=1.5MHz
5.5
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= .
T(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=
T
F SC
T
L
To guarantee sufficient output current, peak inductor
current must be lower than the FP6381A high-side
MOSFET current limit. The peak inductor current
is shown as below:
PA =
T(MA
+
L
2
IPEAK
IOUT(MAX)
∆IL
Time
FP6381A-0.3-DEC-2013
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FP6381A.PDF ] | |
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