Preliminary Datasheet
LP3987H
600mA,Ultra-low noise, Ultra-Fast CMOS LDO Regulator
General Description
Features
The LP3987H is designed for portable RF and wireless
Ultra-Low-Noise for RF Application
applications with demanding performance and space
2.5V- 6.0V Input Voltage Range
requirements. The LP3987H performance is optimized
Low Dropout : 360mV @ 600mA
for battery-powered systems to deliver ultra low noise
High PSSR:-65dB at 1KHz
and low quiescent current. Regulator ground current
< 0.01uA Standby Current When Shutdown
increases only slightly in dropout, further prolonging
Ultra-Fast Response in Line/Load transient
the battery life. The LP3987H also works with low-ESR
Current Limiting and Thermal Shutdown
ceramic capacitors, reducing the amount of board
space necessary for power applications, critical in
Protection
hand-held wireless devices. The LP3987H consumes
Applications
less than 0.01µA in shutdown mode and has fast
Portable Media Players/MP3 players
turn-on time less than 20µs. The other features include
Cellular and Smart mobile phone
ultra low dropout voltage, high output accuracy,
Sensor Module, RF Module
current limiting protection, and high ripple rejection
ratio. It is available in the 5-lead of SOT23-5
packages.
Typical Application Circuit
VIN
VIN
VOUT
Cin
2.2uF
Order Information
Cout
2.2uF
VOUT
GND
LP3987H □ □ □ □ □
ON
F: Pb-Free
OFF
EN
NC
Package Type
B5: SOT23-5
Output Type
Marking Information
12: 1.2V
Device
15: 1.5V
LP3987H
Marking
Package
Shipping
SOT23-5
3K/REEL
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
36: 3.6V
LP3987H-05
May.-2017
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Page 1 of 8
Preliminary Datasheet
LP3987H
Functional Pin Description
Package Type
Pin Configurations
Top View / SOT23-5
SOT23-5
VIN
1
GND
2
EN
3
5
4
VOUT
NC
Pin Description
Pin
Name
Description
1
VIN
Power Input Voltage.
2
GND
Ground.
3
EN
4
NC
No connection.
5
VOUT
Output Voltage.
Chip Enable (Active High). Note that this pin is high impedance. There is an integrated pull
low 1MΩ resistor connected to GND when the control signal is floating.
Function Diagram
EN
VIN
SHUTDOWN AND
LOGIC CONTROL
VREF
+
ERROR
AMPLIFIER
MOS
DRIVER
VOUT
CURRENT-LIMIT
AND THERMAL
PROTECTION
GND
LP3987H-05
May.-2017
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Page 2 of 8
Preliminary Datasheet
LP3987H
Absolute Maximum Ratings
Input Voltage to GND
------------------------------------------------------------------------------------- -0.3V to 6.5V
Other pin to GND ----------------------------------------------------------------------------------------------- -0.3V to 6V
Power Dissipation, PD @ TA = 25°C
Maximum Power Dissipation ( PD,TA=25°C) ------------------------------------------------------------------- 0.5W
Package Thermal Resistance
Thermal Resistance (JA) ---------------------------------------------------------------------------------------- 195℃/W
Thermal Resistance (JC ------------------------------------------------------------------------------------------- 60℃/W
Maximum Junction Temperature ---------------------------------------------------------------------------------- 150°C
Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260°C
Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 165°C
ESD Susceptibility
HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV
MM(Machine-Mode) --------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
Supply Input Voltage ------------------------------------------------------------------------------------------- 2.5V to 6V
Operation Junction Temperature Range ------------------------------------------------------------ -40°C to 125°C
Operation Ambient Temperature Range ------------------------------------------------------------- -40°C to 85°C
LP3987H-05
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Preliminary Datasheet
LP3987H
Electrical Characteristics
(VIN = VOUT + 0.8V, Cin = Cout = 1µF, TA = 25° C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ.
Max
Units
Output Voltage Accuracy
ΔVOUT
IOUT = 1mA
−2
--
+2
%
Output Current
Iout
VEN=VIN, VIN>2.5V
600
mA
Current Limit
ILIM
RLOAD = 1Ω
800
mA
Quiescent Current
IQ
VEN≥1.4V,Output floating
110
130
Dropout Voltage
VDROP
IOUT=100mA,VOUT> 2.8V
60
80
IOUT=600mA,VOUT> 2.8V
360
480
Line Regulation
ΔVLINE
Load Regulation
ΔLOAD
1mA < IOUT < 300mA
Standby Current
ISTBY
VEN = GND, Shutdown
EN Input Bias Current
IIBSD
VEN = 5V
Logic-Low
EN Threshold
Voltage
Logic-High
Voltage
VIL
VIH
f = 1kHz
Rejection Rate
f = 10kHz
Thermal Shutdown Temperature
LP3987H-05
May.-2017
%
2
%
0.01
1
μA
4
6
μA
VIN = 3V to 5.5V,
0.4
Shutdown
VIN = 3V to 5.5V,
VIN+
1.4
Start-Up
IOUT=200mA, Cout=1µF
PSRR
100
-65
IOUT = 10mA
-55
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V
0.3
Cout = 1µF,
TSD
mV
0.2
IOUT = 1mA
10Hz to 100kHz,
Output Noise Voltage
Power Supply
VIN=(VOUT+1V) to 5.5V,
μA
150
www.lowpowersemi.com
uVRMS
dB
°C
Page 4 of 8
Preliminary Datasheet
LP3987H
Typical Operating Characteristics
LP3987H-05
May.-2017
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Page 5 of 8
Preliminary Datasheet
LP3987H
Applications Information
Like any low-dropout regulator, the external capacitors
used with the LP3987H must be carefully selected for
regulator stability and performance. Using a capacitor
whose value is > 1µF on the LP3987H input and the
amount of capacitance can be increased without limit.
The input capacitor must be located a distance of not
more than 0.5 inch from the input pin of the IC and
returned to a clean analog ground. There is a special
attention which is the input capacitance should not be
less than output capacitance. Any good quality
ceramic or tantalum can be used for this capacitor.
Thermal Considerations
Thermal
protection
limits
power
dissipation
in
LP3987H. When the operation junction temperature
exceeds 150°C, the OTP circuit starts the thermal
shutdown function turn the pass element off. The pass
element turns on again after the junction temperature
cools by 25°C. For continue operation, do not exceed
absolute maximum operation junction temperature
125°C.
The power dissipation definition in device is :
The capacitor with larger value and lower ESR
PD = (VIN−VOUT) x IOUT + VIN x IQ
(equivalent series resistance) provides better PSRR
The maximum power dissipation depends on the
and line-transient response. The output capacitor must
meet both requirements for minimum amount of
capacitance and ESR in all LDOs application. The
LP3987H is designed specifically to work with low ESR
ceramic
output
capacitor
in
space-saving
and
performance consideration. Using a ceramic capacitor
thermal resistance of IC package, PCB layout, the rate
of surroundings airflow and temperature difference
between junction to ambient.
The maximum power dissipation can be calculated by
following formula :
whose value is at least 1µF with ESR is > 25mΩ on the
PD(MAX) = ( TJ(MAX) − TA ) /θJA
LP3987H output ensures stability. The LP3987H still
Where TJ(MAX) is the maximum operation junction
works well with output capacitor of other types due to
the wide stable ESR range. Output capacitor of larger
capacitance can reduce noise and improve load
transient response, stability, and PSRR. The output
capacitor should be located not more than 0.5 inch
from the VOUT pin of the LP3987H and returned to a
clean analog ground.
temperature 125°C, TA is the ambient temperature
and the θJA is the junction to ambient thermal
resistance. For recommended operating conditions
specification of LP3987H, where TJ(MAX) is the
maximum junction temperature of the die
(125°C) and TA is the maximum ambient temperature.
The junction to ambient thermal resistance (θJA is
layout dependent) for SOT23-5 package is 195°C/W.
PD(MAX) = (125°C−25°C) / 195°C = 500mW (SOT23-5)
The
maximum
power
dissipation
depends
on
operating ambient temperature for fixed TJ(MAX) and
thermal resistance θJA. When considering the thermal
characteristic of PCB it may be larger than 500mW.
LP3987H-05
May.-2017
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Page 6 of 8
Preliminary Datasheet
LP3987H
Start-up Function Enable Function
The
LP3987H
features
an
LDO
regulator
enable/disable function. To assure the LDO regulator
will switch on, the EN turn on control level must be
greater than 1.4 volts. The LDO regulator will go into
the shutdown mode when the voltage on the EN pin
falls below 0.4 volts. For to protecting the system, the
LP3987H have a quick-discharge function. If the
enable function is not needed in a specific application,
it may be tied to VIN to keep the LDO regulator in a
continuously on state.
LP3987H-05
May.-2017
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Page 7 of 8
Preliminary Datasheet
LP3987H
Packaging Information
SOT23-5
LP3987H-05
May.-2017
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Page 8 of 8
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