fitipower integrated technology lnc.
FP6145B
2A Ultra Low Dropout
Linear Regulator
Description
The FP6145B is a 2A ultra low dropout linear
regulator. This product is specifically designed to
provide well supply voltage for front-side-bus
termination on motherboards and NB applications.
The IC needs two supply voltages, control voltage for
the circuitry and main supply voltage for power
conversion, to reduce power dissipation and provide
extremely low dropout. The FP6145B integrates
many functions. Power-On-Reset (POR) circuit
monitors both supply voltages to prevent wrong
operations. Thermal shutdown and current limit
functions protect the device against thermal and
current over-loads. POK indicates the output status
with time delay which is set internally. It can control
other converter for power sequence. The FP6145B
can be enabled by other power system. Pulling and
holding the EN pin below 0.4V shuts off the output.
The FP6145B is available in SOP-8 (EP) package
which features small size as an exposed pad to
reduce the junction-to-case resistance.
Features
Ultra Low Dropout - 0.24V(typ.) at 2A Output
Current
Low ESR Output Capacitor (Multi-layer Chip
Capacitors (MLCC)) Applicable
0.8V Reference Voltage
Fast Transient Response
Adjustable Output Voltage by External Resistors
Power-On-Reset Monitoring on Both VCNTL
and VIN Pins
Internal Soft-Start
Under-Voltage Protection
Current-Limit and Thermal Shutdown Protection
Power-OK Output with a Delay Time
SOP-8 Exposed Pad Green Package
Applications
LCD Monitor/TV
PC Motherboard/NB
Graphic Card
DVD-Video Player
ADSL Modem
Printer and other Peripheral Equipment
Pin Assignment
SP Package (SOP-8 Exposed Pad)
Ordering Information
FP6145B
□□□
FP6368
□□□
GND
FB
VOUT
NC
TR: Tape/Reel
C: Green
Package Type
SP: SOP-8 (Exposed Pad)
Top View
POK
EN
VIN
VCNTL
1
2
4
9
3 GND
8
7
6
5
Figure1. Pin Assignment of FP6145B
FP6145B-1.0-MAR-2014
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fitipower integrated technology lnc.
FP6145B
Typical Application Circuit
R3
10K
U1
VCNTL=5V
4 VCNTL
1
ON
OFF
2
POK
EN
VIN 3
NC
VOUT
FB
5
6
7
R1
1K
R2
2K
C6
12~48nF
C2
100μF
C3
0.1μF
V
OUT
=1.2V/2A
C5
0.1μF
V
IN
=1.5V
C1
1μF
FP6145B
8 GND
C4
220μF
Figure 2. an EC as a Main Output Capacitor
R3
10K
U2
VCNTL=5V
4 VCNTL
1
ON
OFF
2
POK
EN
VIN 3
NC
VOUT
FB
5
6
7
V
OUT
=1.2V/2A
R1
39K
R2
78K
C4
56pF
C3
10μF
C2
10μF
V
IN
=1.5V
C1
1μF
FP6145B
8 GND
V
OUT
=VFB*(1+R1/R2)
VFB=0.8V
Figure 3. Using a MLCC as the Output Capacitor
FP6145B-1.0-MAR-2014
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fitipower integrated technology lnc.
FP6145B
Functional Pin Description
Pin Name
POK
EN
VIN
VCNTL
NC
VOUT
FB
GND
Exposed Pad
Pin No.
1
2
3
4
5
6
7
8
9
Power OK output pin.
Internal pull high.
EN=High or Floating
Enable.
EN=Low
Shutdown mode.
MOSFET power supply input pin.
Input pin for internal control circuitry.
No connection.
Output pin of the regulator.
Output voltage feedback pin.
GND pin.
Thermal dissipation pad. Connect exposed pad to GND.
Pin Function
Block Diagram
N-MOSFET
Current Limit
and Foldback
VIN
Power-ON
Reset
VOUT
VCNTL
Error
Amp
-
+
1MΩ
EN
Enable
Soft-Start
And
Control Logic
Vref = 0.8V
Thermal
Shutdown
+
UVP
-
FB
0.35V
Delay
POK
-
POK
Figure 4. Block Diagram of FP6145B
GND
+
92%
Vref
FP6145B-1.0-MAR-2014
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fitipower integrated technology lnc.
FP6145B
Absolute Maximum Ratings
● VCNTL Supply Voltage ---------------------------------------------------------------------------------- -0.3V to +6V
● VIN Supply Voltage --------------------------------------------------------------------------------------- -0.3V to +6V
● VCNTL and VIN Pulse Voltage (15ns) ---------------------------------------------------------------- -0.3V to +10V
● EN and FB Pin Voltage ----------------------------------------------------------------------------------- -0.3V to V
CNTL
+0.3V
● Power OK Voltage ----------------------------------------------------------------------------------------- -0.3V to +6V
● Power Dissipation @T
A
=25°C, (P
D
) (Note 1)
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 2.08W
● Package Thermal Resistance, (θ
JA
)
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 60°C/W
● Package Thermal Resistance, (θ
JC
)
SOP-8 (Exposed Pad) ------------------------------------------------------------------------ 15°C/W
● Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------- 260°C
●Junction Temperature (T
J
) ------------------------------------------------------------------------------- -40°C to 150°C
● Storage Temperature (T
STG
) ---------------------------------------------------------------------------- -65°C to 150°C
Note 1：θ
JA
is measured with the PCB copper area (need connecting to Expose-Pad) of approximately 1.5 in
2
(Multi-layer)
Recommended Operating Conditions
● VCNTL Supply Voltage ----------------------------------------------------------------------------------- +3V to +5.5V
● VIN Supply Voltage ---------------------------------------------------------------------------------------- +1.2V to +5.5V
● Output Voltage (Conditions: V
CNTL
-V
OUT
>1.9V) ----------------------------------------------------- 0.8V to V
IN
-V
DROP
● Output Current ---------------------------------------------------------------------------------------------- 0A to 2A
● Operating Temperature Range ------------------------------------------------------------------------- -40°C to +85°C
FP6145B-1.0-MAR-2014
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fitipower integrated technology lnc.
FP6145B
Electrical Characteristics
(V
CNTL
=5V, V
IN
=1.5V, V
OUT
=1.2V, T
A
=25°C unless otherwise specified)
Parameter
VCNTL POR Threshold
VCNTL POR Hysteresis
VIN POR Threshold
VIN POR Hysteresis
VCNTL Nominal Supply Current
VCNTL Shutdown Current
Feedback Voltage Regulation
Load Regulation
Symbol
V
CNTL
V
CNTL(hys)
V
IN
V
IN(hys)
I
CNTL
I
SD
V
FB
EN=V
CNTL
EN=0V
V
CNTL
3.0~5.5V
I
OUT
=10mA
I
OUT
=10mA~2A
1.2V＜V
OUT
＜1.8V
I
OUT
=2A
V
CNTL
=5V
1.8V≦V
OUT
＜2.5V
2.5V≦V
OUT
＜2.8V
2.8V≦V
OUT
＜3.1V
VOUT Pull Low Resistance
Soft Start Time
T
SS
V
ENH
EN Pin Logic High threshold voltage
V
ENL
EN Pin Pull High Resistor
Current Limit
VIN
Ripple Rejection
VCNTL
Under-Voltage Protect Threshold
Under-Voltage Protect Current Foldback
POK Threshold Voltage for Power OK
POK Threshold Voltage for Power Not OK
POK Low Voltage
POK Delay Time
Thermal shutdown Temp
Thermal Shutdown Hysteresis
FP6145B-1.0-MAR-2014
Test Conditions
Min
2.5
-
0.95
Typ
2.7
0.4
1.05
0.3
Max
2.9
-
1.15
Units
V
V
V
V
-
-
0.79
-
-
-
-
-
-
-
1
10
0.8
0.06
0.23
0.24
0.28
0.3
85
0.7
-
-
1
4
65
65
0.35
120
92%
89%
0.25
2
170
50
1.8
15
0.81
0.25
0.28
0.29
mA
μA
V
%
Dropout Voltage
V
DROP
V
0.38
0.4
-
-
-
V
0.4
-
-
-
dB
-
-
-
-
95%
-
0.4
3
-
-
V
mA
VFB
VFB
V
mS
°C
°C
MΩ
A
Ω
mS
EN=0V
Enable
Disable
EN=V
CNTL
V
CNTL
=3~5.5V
T
J
= -40~125°C
F=120Hz, I
OUT
=100mA
1.2
-
-
3
-
I
EN
I
LIM
PSRR
V
FB
Falling
-
-
V
POK
V
PNOK
V
FB
Rising
V
FB
Falling
POK sinks 1mA
89%
-
-
1
-
-
T
DELAY
T
SD
T
SD(HYS)
5
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