Down Regulator. FP6357 Datasheet

FP6357 Regulator. Datasheet pdf. Equivalent

FP6357 Datasheet
Recommendation FP6357 Datasheet
Part FP6357
Description High Efficiency 1.5MHz 1.2A Synchronous Step Down Regulator
Feature FP6357; fitipower integrated technology lnc. FP6357 High Efficiency 1.5MHz/a18.25AT Synchronous Step Down .
Manufacture Fiti
Datasheet
Download FP6357 Datasheet




Fiti FP6357
fitipower integrated technology lnc.
FP6357
High Efficiency 1.5MHz/a18.25AT
Synchronous Step Down Regulator
Description
The FP6357 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
(Marking)
1 23
EN GND LX
S6 Package (SOT-23-6)
FB PG VIN
654
(Marking)
1 23
EN GND LX
Figure 1. Pin Assignment of FP6357
Features
Low RDS(ON) for Internal Switch (Top/Bottom):
200/150mΩ
2.5V~5.5V Input Voltage Range
1.2A Output Current
High Efficiency up to 95%
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
Mini-Notebook
Net PC
Ordering Information
FP6357□□□
TR: Tape/Reel
C: Green
Package Type
S5: SOT-23-5
S6: SOT-23-6
SOT-23-5 Marking
Part Number
Product Code
FP6357S5CTR
Fi3
SOT-23-6 Marking
Part Number
Product Code
FP6357S6CTR
Fi4
FP6357-Preliminary 0.1-MAY-2013
1



Fiti FP6357
fitipower integrated technology lnc.
Typical Application Circuit
VIN
C1
PG
OFF ON
EN
VIN LX
FP6357
R3
PG
GND
FB
L1
R1
C3
(opt.)
R2
FP6357
/a85T
VOUT
C2
Figure 2. Schematic Diagram
VOUT
3.3V
2.5V
1.8V
1.5V
1.2V
1.05V
C1
4.7μF MLCC
4.7μF MLCC
4.7μF MLCC
4.7μF MLCC
4.7μF MLCC
4.7μF MLCC
R1
453k
316k
200k
150k
100k
75k
R2
100k
100k
100k
100k
100k
100k
Table 1. Recommended Component Values
L1
μH
μH
1.8μH
1.5μH
1.5μH
1.2μH
C2
10μF MLCC
10μF MLCC
10μF MLCC
10μF MLCC
10μF MLCC
10μF MLCC
FP6357-Preliminary 0.1-MAY-2013
2



Fiti FP6357
fitipower integrated technology lnc.
FP6357
Functional Pin Description
Pin Name
Pin No.
(SOT-23-5)
Pin No.
(SOT-23-6)
Pin Function
EN 1
1 Enable Control. Pull high to turn the IC on, and pull low to disable the IC.
/a85T
GND
2
2 Ground Pin.
LX 3
3 Inductor connection to the drains of the internal power MOSFETs.
VIN 4
FB 5
PG --
4 Power Supply Input Pin. Drive VIN pin by 2.5V to 5.5V voltage to power on the chip.
6
Voltage Feedback Input Pin. Connect FB and VOUT with a resistive voltage divider. This
IC senses feedback voltage via FB and regulates it at 0.6V.
5 Open Drain Power Good Output Pin. (SOT-23-6 only)
Block Diagram
PG
(SOT-23-6)
EN
VIN
Power Good
1M
Enable
Control
Undervoltage
Lockout
Bias Supply
90%
VREF
FB
EA
Compensation
VREF
Soft
Start
Slope Compensation
COMP
Control Logic
Current Limit
Logic
Control
and
Driver
Logic
1X
Oscillator
LX
GND
Figure 3. Block Diagram of FP6357
FP6357-Preliminary 0.1-MAY-2013
3







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