FP6142-18C5P [FITIPOWER]
500mA Low Noise LDO with Soft-Start and Output Discharge Function;型号: | FP6142-18C5P |
厂家: | Fitipower |
描述: | 500mA Low Noise LDO with Soft-Start and Output Discharge Function |
文件: | 总10页 (文件大小:488K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
fitipower integrated technology lnc.
500mA Low Noise LDO with
Soft-Start and Output Discharge Function
Description
Features
The FP6142 is a family of CMOS low dropout (LDO)
regulators with a low dropout voltage of 250mV at
500mA designed for noise-sensitive portable device,
RF and wireless applications. Quiescent current of
FP6142 is as low as 50μA and it works with low-ESR
ceramic capacitors, which makes it very suitable for
space sensitive handheld applications. The soft-start
function will eliminate current surges during start-up
and the output discharge function will dissipate the
residue output voltage in the capacitor during
shut-down.
Ultra-Low Dropout Voltage of 250mV at 500mA
Wide Operating Voltage Ranges from 2.2V to
5.5V
Low Quiescent Current at 50μA
Programmable Soft Start
5mA Discharge Current of VOUT when IC
Shutdown
Low Output Noise
Fast Response in Line/Load Transient
Current Limit Protection
Thermal Shutdown Protection
1µF Output Capacitor Required for Stability
RoHS Compliant
Other features include current limit, thermal protection,
high output accuracy, and low noise output etc..
The FP6142 is available in both SOT-23-5 and
SC-70-5 packages.
Applications
Digital Still Camera
CDMA/GSM Cellular-Handset
Portable Information Appliance
Laptop, Palmtop and Notebook Computer
Mini PCI, PCI-Express and PCMCIA Card
Pin Assignments
Ordering Information
FP6142-□□□□
S5 Package (SOT-23-5)
TR: Tape/Reel
VOUT
SS
P: Green
G: Green
5
1
4
3
2
Package Type
S5: SOT-23-5
C5: SC-70-5
VIN GND EN
Output Voltage
C5 Package (SC-70-5)
15: 1.5V
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
31: 3.1V
33: 3.3V
VOUT
SS
5
1
4
3
Note: Please consult Fitipower sales office or
authorized distributors for availability of special
output voltages.
2
VIN GND EN
Figure 1. FP6142 Pin Assignments
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SOT-23-5 Marking
Part Number
SC-70-5 Marking
Part Number
Product
Code
Product
Code
Product
Code
Product
Code
Part Number
Part Number
FP6142-15S5P
FP6142-15S5G
FP6142-18S5P
FP6142-18S5G
FP6142-25S5P
FP6142-25S5G
FP6142-28S5P
Da
FP6142-28S5G
FP6142-30S5P
FP6142-30S5G
FP6142-31S5P
FP6142-31S5G
FP6142-33S5P
FP6142-33S5G
v0=
De
FP6142-15C5P
FP6142-15C5G
FP6142-18C5P
FP6142-18C5G
FP6142-25C5P
FP6142-25C5G
Dm
Dm=
Dn
FP6142-28C5G
FP6142-30C5P
FP6142-30C5G
FP6142-31C5P
FP6142-31C5G
FP6142-33C5G
x0=
Da=
Db
Ds
De=
Df
Ds=
Dt
Db=
Dd
Dn=
Dr
Df=
w0
Dt=
z0=
Dd=
v0
Dr=
w0=
Typical Application Circuit
VIN
VOUT
VIN
EN
VOUT
CIN
1µF/X7R
COUT
1µF/X7R
FP6142
Chip Enable
SS
CSS
0.5nF
GND
Figure 2. Typical Application Circuit for FP6142
Note 1:To prevent oscillation, it is recommended to use minimum 1µF X7R or X5R dielectric capacitors if ceramics are
used as input/output capacitors.
Functional Pin Description
Pin Name
Pin No.
Pin Function
VIN
1
2
3
4
5
Supply Voltage.
Ground.
GND
EN
Chip Enable Control Input. Pull the pin high to enable IC, and pull low or keep it floating to disable the
device.
SS
Soft Start Pin.
LDO Output.
VOUT
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Block Diagram
RSEN
PMOS
VIN
VOUT
Current
Limit
CF
R1
Error
Amp
Power
Shutdown
EN
_
+
R
R2
Thermal
Shutdown
Vref
GND
SS
Figure 3. Block Diagram of FP6142
Absolute Maximum Ratings
● VIN, EN, SS to GND --------------------------------------------------------------------------------------------- +6V
● Power Dissipation @25°C, (PD)
SOT-23-5 ----------------------------------------------------------------------------------------------- +0.4W
SC-70-5 ------------------------------------------------------------------------------------------------- +0.3W
● Package Thermal Resistance, (θJA)
SOT-23-5 ----------------------------------------------------------------------------------------------- +250°C/W
SC-70-5 ------------------------------------------------------------------------------------------------- +333°C/W
● Maximum Junction Temperature ----------------------------------------------------------------------------- +150°C
● Storage Temperature Range (TSTG) ------------------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec) ---------------------------------------------------------------------- +260°C
Note 2:Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.
Recommended Operating Conditions
● Supply Voltage (VIN ) -------------------------------------------------------------------------------------------- +2.2V to +5.5V
● Operating Temperature Range ------------------------------------------------------------------------------- -40°C to +85°C
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Electrical Characteristics
(VIN = VOUT+0.5V, VEN = VIN, CIN = 1µF, COUT = 1µF, TA = 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Output Voltage Accuracy
Quiescent Current
Standby Current
Symbol
VIN
Conditions
Min
2.2
-2
Typ.
Max
5.5
+2
Unit
V
ΔVOUT
IQ
ISTBY
ILIM
IL = 10mA
%
VEN=5V, IOUT=0mA
VEN=0V
50
0.7
0.8
75
μA
μA
A
1.5
RLOAD=0Ω, 2.7V≦VIN≦5.5V
Current Limit
0.5
VOUT =1.5V
VOUT =1.8V
360
280
150
140
430
340
180
165
VOUT =2.5V
VOUT =3.0V
VOUT =3.3V
IO=250mA
120
700
550
290
145
840
660
350
Dropout Voltage (Note3)
VDROP
mV
VOUT =1.5V
VOUT =1.8V
VOUT =2.5V
IO=500mA
VOUT =3.0V
VOUT =3.3V
270
240
320
290
1
1mA< IOUT < 500mA, 2.7V≦VIN≦5.5V
CSS=1nF, COUT=1μF
Output on
Load Regulation (Note4)
Soft Start Time
ΔVLOAD
%
0.7
1
ms
1.5
0.1
EN Threshold
V
Output off
0.6
5
Enable Pin Current
IEN
1
μA
Output Noise Voltage (Note5)
VON
COUT=1μF, IOUT=0mA, CSS=1nF
40
μVRMS
Power
Rejection (Note5)
Supply
Ripple
PSRR
ΔVLINE
TSD
IOUT=10mA, f =10kHz
60
0.01
170
30
dB
Line Regulation
VIN = (VOUT + 0.5V) to 5.5V, IOUT = 1mA
0.2
%/V
Thermal Shutdown Threshold
(Note5)
°C
△
Hysteresis
TSD
Note 3:The dropout voltage is defined as VIN-VOUT, which is measured when VOUT drops 2% of its normal value with the specified
output current.
Note 4:Load regulation and dropout voltage are measured at a constant junction temperature by using a 40ms low duty cycle current
pulse.
Note 5:Guarantee by design.
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Typical Performance Curves
60
55
50
45
40
35
30
3.40
3.30
3.20
3.10
3.00
2.90
2.80
VIN=2.3V, VOUT=1.8V
VIN=VEN=3.6V, VOUT=3.1V
-50
-25
0
25
50
75
100 125
Temperature (oC)
-25
0
25
50
75
100 125
Temperature (oC)
Figure 4. Output Voltage vs. Temperature
Figure 5. Quiescent Current vs. Temperature
6
300
VIN =VEN=3.6V, VOUT=3.1V
VIN=VEN=3.6V, VOUT=3.1V
5
250
200
150
100
50
TJ=125oC
4
3
2
1
0
TJ=25oC
TJ=- 40oC
0
0
2
4
6
8
10
0
100
200
300
400
500
Css (nF)
Load Current (mA)
Figure 6. Dropout Voltage vs. Load Current
Figure 7. Soft Start Time vs. SS capacitance
VIN=VEN=2.3V, VOUT=1.8V, ILOAD=1mA to 500mA
VIN=VEN=2.3V, VOUT=1.8V, ILOAD=1mA to 300mA
VOUT
VOUT
IOUT
IOUT
Figure 8. Load Transient Response
Figure 9. Load Transient Response
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Typical Performance Curves (Continued)
VIN=3.6V to 4.6V, VOUT=3.1V, ILOAD=1mA
VIN=3.6V to5.5V, VOUT=3.1V, ILOAD=1mA
VOUT
VOUT
VIN
VIN
Figure 10. Line Transient Response
Figure 11. Line Transient Response
VIN=VEN =3.6V, CSS=22nF, No Load
VIN=VEN =3.6V, No Load
VOUT
VOUT
EN
IIN
EN
IIN
Figure 12. Start-up Response
Figure 13. EN Shutdown Response
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Applications Information
Current Limit
The FP6142 is
a
low-noise, low-dropout,
low-quiescent current linear regulator designed for
space-restricted applications. These devices can
supply loads up to 500mA. As shown in the block
diagram, the FP6142 consists of a highly accurate
band gap core, noise bypass circuit, error amplifier,
P-channel pass transistor, soft start, fast discharge
and an internal feedback voltage divider. The band
gap reference is connected to the error amplifier’s
inverting input. The error amplifier compares this
reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than
the reference voltage, the pass transistor gate will be
pulled low. This allows more current to pass to the
output and increases the output voltage. If the
feedback voltage is too high, the pass transistor gate
will be pulled high, allowing less current to pass to
the output. The output voltage is feedback through
an internal resistor voltage divider connected to the
VOUT pin. Additional blocks include a current limit,
over temperature protection and shutdown logic.
Besides, current limit and on chip thermal shutdown
features provide protection against any combination
of over-load or ambient temperature that could cause
junction temperature exceeding maximum rating.
The FP6142 includes a current limit. It monitors
the output current and controls the pass
transistor’s gate voltage to limit the output current
under 800mA (typ). The output can be shorted to
ground for an indefinite amount of time without
damaging the part.
Quick Discharge
The FP6142 has built-in a quick discharge circuitry
to protect system function correct operation. This
discharge block discharges output capacitor
quickly to avoid low output voltage level to affect
system’s MCU abnormal work when IC is power off
or enable pin pulls down.
Dropout Voltage
The minimum dropout voltage of LDO determines
the lowest usable supply voltage.
In
battery-powered systems, this determines the
useful end-of-life battery voltage. Because the
FP6142 uses
a
P-channel MOSFET pass
transistor, its dropout voltage is a function of
drain-to-source on resistance (RDS-ON) multiplied by
the load current
Output and Input Capacitor
Over Temperature Protection
The FP6142 regulator is designed to be stable with a
wide range of output capacitors. The ESR of the
output capacitor affects stability. Larger value of the
output capacitor decreases the peak deviations and
improves transition response for larger current
changes.
Over temperature protection limits total power
dissipation in the FP6142. When the junction
temperature exceeds TJ=+170C, the thermal
sensor will signal the shutdown logic and turn off
the pass transistor. The thermal sensor will turn
the pass transistor on again after the IC’s junction
temperature drops 30C, resulting in a pulsed
The capacitor types (aluminum, ceramic and
tantalum) have different characterizations, such as
temperature and voltage coefficients. All ceramic
capacitors were manufactured with a variety of
dielectrics, each with different behavior across
temperature and applications. Common dielectrics
used are X5R, X7R and Y5V. It is recommended to
use 1.0µF to 4.7µF X5R or X7R dielectric ceramic
capacitors with 10mΩ to 30mΩ ESR range between
device outputs to ground for transient stability. The
FP6142 is designed to be stable with low ESR
ceramic capacitors and higher values of capacitors,
and ESR could improve output stability. The ESR of
output capacitor is very important because it
generates a zero to provide phase lead for loop
stability.
output
during continuous thermal-overload
conditions.
Thermal-Overload protection is design to protect
the FP6142 in the event of fault condition. For
continual operation, do not exceed the absolute
maximum junction temperature rating of
TJ=+150C.
Thermal Consideration
The power handling capability of the device will be
limited by maximum 125C operation junction
temperature.
The power dissipated by the
device will be estimated by PD = IOUT (VIN-VOUT).
The power dissipation should be lower than the
maximum power dissipation listed in “Absolute
Maximum Ratings” section.
There is no requirement for the ESR on the input
capacitor, but its voltage and temperature coefficient
have to be considered for device application
environment.
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Applications Information (Continued)
Soft Start Capacitor
The SS pin connecting a 0.5nF capacitor could
suppress inrush current and get a gradual increase of
output voltage during power up. As the internal
constant current source charges the external
soft-start capacitor to compare with feedback voltage
to control gate voltage of pass transistor. Therefore,
output current increases from zero to the value
required for regulation. The maximum load current
will be available after the soft-start time is completed.
Active/Shutdown Input Operation
The FP6142 is turned off by pulling the EN pin low
and turned on by pulling it high. The enable input is
TTL/CMOS compatible threshold for simple logic
interfacing. If this feature is not used, the EN pin
should be connected to VIN to keep the regulator
output operating normally. It will become shutdown
with this pin floating because EN pin has built-in a
pull down resistor (refer to Block Diagram).
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Outline Information
SOT-23-5 Package (Unit: mm)
DIMENSION IN MILLIMETER
SYMBOLS
UNIT
MIN
0.90
0.00
0.90
0.30
2.80
2.60
1.50
0.90
1.80
0.30
MAX
1.45
0.15
1.30
0.50
3.00
3.00
1.70
1.00
2.00
0.60
A
A1
A2
B
D
E
E1
e
e1
L
Note:Followed From JEDEC MO-178-C.
Carrier Dimensions
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Outline Information (Continued)
SC-70-5 Package (Unit: mm)
DIMENSION IN MILLIMETER
SYMBOLS
UNIT
MIN
0.90
0.00
MAX
1.10
0.10
A
A1
A2
b
0.90
0.15
1.80
1.80
1.15
0.55
0.26
1.00
0.35
2.20
2.40
1.35
0.75
0.46
D
E1
E
e
L
Carrier Dimensions
Life Support Policy
Fitipower’s products are not authorized for use as critical components in life support devices or other medical systems.
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