LTP33xx
P-1
DESCRIPTION
The LTP33xx family of low-dropout (LDO), low-power linear regulators offers very high power
supply rejection ratio (PSRR) while maintaining very low 40 μA ground current, suitable for RF
applications. The family uses an advanced CMOS process and a P-MOSFET pass device to achieve
fast start-up, very low noise, excellent transient response, and excellent PSRR performance. The
LTP33xx is stable with a 1.0 μF ceramic output capacitor, and uses a precision voltage reference and
feedback loop to achieve a worst-case accuracy of 2% over all load, line, process, and temperature
variations. It is fully specified from TJ=–40°C to +125°C, and is offered in a tiny DFN1×14L/UTDFN1.0×1.0-4L and SOT23-5L/SC70-5L, and SOT23-3L/SOT-89 packages, which are ideal for
small form factor portable equipments such as wireless handsets and wearables.
The LTP33xx is available in standard fixed output voltages of 1.1V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V,
3.3V,3.6V and custom voltage options (50mV step options between 0.8V and 5.0V are available upon
request).
FEATURES
Wide Input Voltage Range: 2.5 V to 6.0 V
Up to 300 mA Load Current
Standard Fixed Output Voltage Options: 1.1 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V and 3.6 V
More Output Voltage Options Available on Request
Ultra Low Dropout: 190 mV at 300 mA Load
Ultra Low Noise: 45 μVRMS at 1.2 V output
Ultra-Fast Start-Up Time: 25 µs
Excellent Load and Line Transient Response
Line Regulation: 0.03% Typically
With Auto Discharge
Shutdown Version Available in DFN1×1-4L, UTDFN1.0×1.0-4L, SOT23-5L and SC70-5L Packages
Normal Version Available in SOT23-3L and SOT-89 Packages
APPLICATIONS
Smart Phones and Cellular Phones
Modems
Security and Surveillance
Portable Devices
Battery-Powered Equipments
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-2
ORDER INFORMATION
Model Note1
LTP33xx
Package
Ordering Number Note1
Packing Option
DFN1×1-4L
LTP33xxNXF4
Tape and Reel, 10000
SOT23-5L
LTP33xxNXT5
Tape and Reel, 3000
SC70-5L
LTP33xxNXC5
Tape and Reel, 3000
UTDFN1.0×1.0-4L
LTP33xxNXFU4
Tape and Reel, 10000
SOT23-3L
LTP33xxXT3
Tape and Reel, 3000
SOT-89
LTP33xxXT4
Tape and Reel ,1000
Note1: xx stands for output voltage, e.g. if xx = 18, the output voltage is 1.8V; if xx = 30, the output voltage is 3.0V.
The device with suffix "N" is shutdown version with enable control input.
PIN CONFIGURATION
Shutdown Version With Enable (Top View)
IN
1
GND
2
EN
3
IN
EN
5
OUT
4
3
4
NC
1
2
OUT
GND
SOT23-5L / SC70-5L
DFN1×1-4L / UTDFN1.0×1.0-4L
Normal Version Without Enable (Top View)
IN
3
1
2
GND
OUT
SOT23-3L
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1
2
3
GND
IN
OUT
SOT-89
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-3
PIN FUNCTION
Pin Number
SOT23-5L
SC70-5L
DFN1×1-4L
UTDFN1.0×1.0-4L
SOT23-3L
Pin
Name
SOT-89
1
4
3
2
IN
2
2
1
1
GND
3
3
4
5
1
2
3
Function
Supply input pin. Must be closely decoupled to
GND with a 1μF or greater ceramic capacitor.
Ground.
EN
Enable control input, active high. Do not leave
EN floating.
NC
No connection.
OUT
Output pin. Bypass a 1μF ceramic capacitor
from this pin to ground.
BLOCK DIAGRAM
IN
EN
OUT
Gate
Driver
Current Limit and
Thermal Shutdown
+
-
0.8V
GND
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
P-4
LTP33xx
FUNCTIONAL DESCRIPTION
Input Capacitor
A 1 μF ceramic capacitor is recommended to connect between IN and GND pins to decouple input power supply
glitch and noise. The amount of the capacitance may be increased without limit. This input capacitor must be
located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide
copper trace is required for both IN and GND.
Output Capacitor
An output capacitor is required for the stability of the LDO. The recommended output capacitance is from 1 μF
to 2.2 μF, Equivalent Series Resistance (ESR) is from 5 mΩ to 100 mΩ, and temperature characteristics is X7R
or X5R. Higher capacitance values help to improve load/line transient response. The output capacitance may
be increased to keep low undershoot/overshoot. Place output capacitor as close as possible to OUT and GND
pins.
ON/OFF Input Operation
The LTP33xx is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used,
the EN pin should be tied to IN pin to keep the regulator output on at all time.
High PSRR and Low Noise
RF circuits such as LNA (low-noise amplifier), up/down-converter, mixer, PLL, VCO, and IF stage, require low
noise and high PSRR LDOs. The temperature-compensated crystal oscillator circuit requires very high PSRR at
RF power amplifier burst frequency. For instance, minimum 65 dB PSRR at 217 Hz is recommended for the
GSM handsets.
In order to provide good audio quality, the audio power supply for hand-free, game, MP3, and multimedia
applications in cellular phones, require low-noise and high PSRR at audio frequency range (20 Hz to 20 kHz).
The LTP33xx, with PSRR of 70 dB at 1 kHz, is suitable for most of these applications that require high PSRR and
low noise.
Ultra Fast Start-up
After enabled, the LTP33xx is able to provide full power in as little as tens of microseconds, typically 25 μs.
This feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life
for mobile phones and other portable devices.
Fast Transient Response
Fast transient response LDOs can also extend battery life. TDMA-based cell phone protocols such as Global
System for Mobile Communications (GSM) have a transmit/receive duty factor of only 12.5 percent, enabling
power savings by putting much of the baseband circuitry into standby mode in between transmit cycles. In
baseband circuits, the load often transitions virtually instantaneously from 100 μA to 100 mA. To meet this load
requirement, the LDO must react very quickly without a large voltage drop or overshoot — a requirement that
cannot be met with conventional, general-purpose LDOs.
The LTP33xx’s fast transient response from 0 to 300 mA provides stable voltage supply for fast DSP and GSM
chipset with fast changing load.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
P-5
LTP33xx
Low Quiescent Current
Cellular phone baseband internal digital circuits typically operate all the time. That requires LDO stays on at all
times. However, in the standby mode, the microprocessor consumes only around 100 ~ 300 μA. Since the
phone stays in standby for the longest percentage of time, using a 40 μA quiescent current LDO, instead of 100
μA, saves 60 μA and can substantially extends the battery standby time.
The LTP33xx, consuming only around 40 μA for all input range and output loading, provides great power saving
in portable and low power applications.
Current Limit Protection
When output current at the OUT pin is higher than current limit threshold or the OUT pin, the current limit
protection will be triggered and clamp the output current to approximately 500 mA to prevent over-current and
to protect the regulator from damage due to overheating.
Thermal Shutdown Protection
Thermal protection disables the output when the junction temperature rises to approximately +155°C, allowing
the device to cool down. When the junction temperature reduces to approximately +130°C the output circuitry
is enabled again. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal
protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it
from damage due to overheating.
FUNCTIONAL DESCRIPTION
Parameter
Rating
Unit
IN Voltage
–0.3 to 6.5
V
–0.3 to VIN + 0.3
V
Maximum Load Current
500
mA
Junction to Ambient Thermal Resistance (θJA ), SOT23-5
220
℃/W
Operating Junction Temperature
–40 to 125
℃
Storage Temperature
–65 to 150
℃
300
℃
Other Pin Voltage
Lead Temperature (Soldering, 10 sec)
NOTE：Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
CAUTION:
This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. LINEARIN
recommends that all integrated circuits be handled with appropriate precautions. Failure to observe
proper handling and installation procedures can cause damage. ESD damage can range from subtle
performance degradation to complete device failure. Precision integrated circuits may be more susceptible
to damage because very small parametric changes could cause the device not to meet its published
specifications.
LINEARIN reserves the right to make any change in circuit design, specification or other related things if
necessary without notice at any time. Please contact LINEARIN sales office to get the latestdatasheet.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-6
ELECTRICAL CHARACTERISTICS
(VIN = VEN = 3.6 V, TA = 25 °C unless otherwise noted)
Parameter
Symbol
Test Conditions
Input Voltage Operation Range
VIN
Dropout Voltage
VDROP
VOUT ≥ 2.8 V, IOUT = 300 mA
DC Supply Quiescent Current
IQ_ON
DC Supply Shutdown Current
Regulated Output Voltage
Min.
Typ.
Max.
Unit
6.0
V
190
280
mV
Active mode: VEN = VIN
40
70
µA
IQ_OFF
VEN = 0V
0.01
1
µA
VOUT
IOUT = 1 mA, –40℃ ≤ TA ≤ 85℃
2
%
0.03
0.2
%
0.4
%
2.5
–2
Output Voltage Line Regulation
VIN = VOUT + 1 V to 5.5 V,
IOUT = 10 mA
Output Voltage Load Regulation
IOUT from 0 mA to 300 mA
0.1
Soft-start Time
from Enable to Power On
25
Current Limit
RLOAD = 1 Ω
f = 1 kHz, COUT = 1 μF,
IOUT = 20 mA
f = 10 kHz, COUT = 1 μF,
IOUT = 30 mA
Power Supply Rejection Ratio
PSRR
Output Noise
300
mA
70
dB
52
10 Hz to100 kHz, IOUT = 200 mA,
VOUT = 2.8 V,COUT = 1 μF
70
10 Hz to 100 kHz, IOUT = 200 mA,
VOUT = 1.2 V,COUT = 1 μF
45
µVRMS
EN Low Threshold
0.4
EN High Threshold
EN Pin Input Current
µs
1.4
IEN
V
V
0
0.1
µA
Over-temperature Shutdown
Threshold
155
℃
Over-temperature Shutdown
Hysteresis
20
℃
Note: Production test at + 25℃. Specifications over the temperature range are guaranteed by design and characterization.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-7
TYPICAL PERFORMANCE CURVES
Line Regulation VOUT vs. VIN
COUT = CIN = 1 μF, IOUT = 10 mA
3.4
Vout (-40℃)
3.38
Vout (25℃)
3.36
Vout (85℃)
Vout (125℃)
Vout (-40℃)
3.38
Vout (25℃)
3.36
3.34
3.34
3.32
3.32
Vout (V)
Vout (V)
3.4
Line Regulation VOUT vs.VIN
COUT = CIN = 1 μF, IOUT = 30 mA
3.3
3.28
Vout (85℃)
Vout (125℃)
3.3
3.28
3.26
3.26
3.24
3.24
3.22
3.22
3.2
3.2
4
3.5
3.5
4.5
4
Line Regulation VOUT vs. VIN
COUT = CIN = 1 μF, IOUT = 200 mA
Vout (85℃)
3.36
3.34
3.34
3.32
3.32
Vout (V)
Vout (V)
Vout (-40℃)
Vout (25℃)
3.38
Vout (25℃)
Vout (85℃)
Vout (125℃)
3.36
Line Regulation VOUT vs. VIN
COUT = CIN = 1 μF, VIN = 4.3 V
3.4
Vout (-40℃)
3.38
3.3
3.28
5
Vin (V)
Vin (V)
3.4
4.5
Vout (125℃)
3.3
3.28
3.26
3.26
3.24
3.24
3.22
3.22
3.2
3.2
3.5
4
Vin (V)
4.5
0
5
50
100 150 200 250 300
Iout (mA)
Ripple Rejection vs. Frequency
IOUT = 30 mA, COUT = 1 μF
DropoutVoltage vs. Load Current
90
250
3.0V
200
RippleRejection (dB)
DropoutVoltage (mV)
80
150
100
50
1.2V
70
60
50
40
30
20
10
0
0
0
100
200
300
400
Load Current (mA)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
0.1
1
10
Frequency (kHz)
100
1000
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-8
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient Response
Load Transient Response
VIN = 4.2 V, VOUT = 3.3 V, CIN = COUT = 1 μF,
IOUT = 10 mA to 310 mA to 10 mA
VIN = 4.2 V, VOUT = 3.3 V, CIN = COUT = 1 μF,
IOUT = 10 mA to 160 mA to 10 mA
(Rise/Fall time = 500 ns)
(Rise/Fall time = 500 ns)
CH1: VOUT, 50 mV/Div, DC Offset = 3.3 V
CH1: VOUT, 50 mV/Div, DC Offset = 3.3V
CH2: IOUT, 100 mA/Div DC
CH2: IOUT, 50 mA/Div DC
TIME: 10 ms/Div
TIME: 20 ms/Div
Load Transient Response
VIN = 4.2 V, VOUT = 3.3 V, CIN = COUT = 1 μF,
IOUT = 10 mA to 80 mA to 10 mA
Line Transient Response
VIN = 3.8 V to 4.8 V to 3.8 V
(Rise/Fall time = 500 ns)
(Rise/Fall time = 500 ns)
VOUT = 3.3 V, CIN = COUT = 1 μF, IOUT = 100 mA
CH1: VOUT, 100 mV/Div, DC Offset = 3.3 V
CH2: VOUT, 20 mV/Div, DC Offset = 3.3 V
CH2: IOUT, 25 mA/Div DC
CH1: VIN, 2V/Div DC Offset = 3.8 V
TIME: 10ms/Di
TIME: 20 ms/Div
Line Transient Response
Line Transient Response
VIN = 3.8 V to 4.8 V to 3.8 V
VIN = 3.8 V to 4.8 V to 3.8 V
(Rise/Fall time = 500 ns)
VOUT = 3.3 V, CIN = COUT = 1 μF, IOUT = 50 mA
(Rise/Fall time = 500 ns)
VOUT = 3.3 V, CIN = COUT = 1 μF, IOUT = 10 mA
CH2: VOUT, 20 mV/Div, DC Offset = 3.3 V
CH2: VOUT, 20 mV/Div, DC Offset = 3.3 V
CH1: VIN, 2 V/Div DC Offset = 3.8 V
CH1: VIN, 2 V/Div DC Offset = 3.8 V
TIME: 20 ms/Div
TIME: 20 ms/Div
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-9
Exiting Shutdown
Entering Shutdown
VIN = 4.2 V, VOUT = 3.3 V, CIN = COUT = 1 μF,
VIN = 4.2 V, VOUT = 3.3 V, CIN = COUT = 1 μF,
IOUT = 10 mA
IOUT = 10 mA
CH1: EN, 5 V/Die, DC CH2:
CH1: EN, 5 V/Die, DC CH2:
VOUT, 1 V/Die DC
VOUT, 1 V/Die DC
TIME: 40 μs/Div
TIME: 40 μs/Div
APPLICATION CIRCUITS
VIN
VOUT
OUT
IN
1μF
1μF
LTP33xx
Enable
EN
GND
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-10
PACKAGE DIMENSION
UTDFN1.0×1.0-4L
D
A2
L
A
E
e
A1
b
PIN1
Unit: mm
MIN
Dimensions In Millimeters
MOD
A
0.340
0.370
0.400
A1
0.000
0.020
0.050
Symbol
A2
MAX
0.100REF
D
0.950
1.000
1.050
D1
0.430
0.480
0.530
E
0.950
1.000
1.050
E1
0.430
0.480
0.530
b
0.170
0.220
0.270
e
0.650BSC
f
0.190
0.195
0.200
L
0.200
0.250
0.300
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-11
PACKAGE DIMENSION
DFN1.0×1.0-4L
D
A2
L
A
E
e
A1
b
PIN1
Unit: mm
MIN
Dimensions In Millimeters
MOD
A
0.450
0.500
0.550
A1
0.000
0.025
0.050
Symbol
A2
MAX
0.125REF
D
0.950
1.000
1.050
D1
0.380
0.480
0.580
E
0.950
1.000
1.050
E1
0.380
0.480
0.580
b
0.150
0.200
0.250
e
0.650BSC
f
0.190
0.195
0.200
L
0.150
0.250
0.350
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-12
PACKAGE DIMENSION
SC70-5L
L1
D
L
E
E1
b
c
e
A
A1
A2
e1
Symbol
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
θ
Dimensions In Millimeters
MAX
1.100
0.100
1.000
0.350
0.150
2.200
2.450
1.350
0.650BSC
1.200
1.400
0.525REF
0.260
0.460
0°
8°
MIN
0.900
0.000
0.900
0.150
0.080
2.000
2.150
1.150
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
Unit: mm
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-13
PACKAGE DIMENSION
SOT23-3L
D
E
E1
L
b
c
e
A
A2
A1
e1
Unit: mm
Symbol
A
A1
A2
b
c
D
E
E1
e
e1
L
θ
MIN
1.050
0.000
1.000
0.300
0.100
2.820
2.650
1.500
1.800
0.300
0°
Dimensions In Millimeters
MAX
1.250
0.100
1.150
0.400
0.200
3.020
2.950
1.700
0.950BSC
2.000
0.600
8°
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-14
PACKAGE DIMENSION
SOT23-5L
D
E
E1
L
b
c
e
Symbol
A
A1
A2
b
c
D
E
E1
e
E1
L
Θ
MIN
0.700
0.000
1.050
0.350
0.080
2.820
2.650
1.600
1.800
0.300
0°
A
A2
A1
e1
Unit: mm
Dimensions In Millimeters
MAX
1.250
0.100
1.150
0.500
0.200
3.020
2.950
1.700
0.950BSC
2.000
0.600
8°
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
LTP33xx
P-15
PACKAGE DIMENSION
SOT-89
D
A
L
E
E1
D1
e
c
b
e1
Unit: mm
Symbol
A
b
c
D
D1
E
E1
e
e1
L
MIN
1.400
0.320
0.350
4.400
3.940
2.300
0.900
Dimensions In Millimeters
MAX
1.600
0.520
0.440
4.600
1.55REF
4.250
2.600
1.500BSC
3.000BSC
1.200
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1620-2C.1 — Data Sheet
300mA, General Purpose, RF Linear Regulators
工商网监
湘ICP备2023018690号
