SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Description:
A low noise, high PSRR and ultra low dropout linear regulator SULR1221 is optimized for low ESR
ceramic capacitors operation with 2A continuous current. The SULR1221 is designed for portable and
wireless devices with demanding performance and space requirements
The SULR1221 offers high precision output voltage of ±2% tolerance. Output voltage can also be
adjusted for those other than the preset values.
A noise bypass pin is available for further reduction of output noise. The bypass pin could be floating
if it’s unnecessary. At 2A load current and 5V output voltage, a 480mV dropout is performed. The
quality of low quiescent current and low dropout voltage makes this device ideal for battery power
applications. The high ripple rejection and low noise of the SULR1221 provide enhanced
performances for critical applications.
In addition, a logic-level shutdown input is included, which reduce supply current to less than 0.01μA
(typ.) in shutdown mode with fast turn-on time less than 100μs. The SULR1221’s current limit and
thermal protection provide protection against any overload condition that would create excessive
junction temperatures.
Features:
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Guaranteed 2A Output Current.
Fast Response in Line/Load Transient
Wide Operating Voltage Ranges: 1.8V to 6.0V.
0.01μA Shutdown Standby Current
Low Quiescent Current: 30μA.
Fixed: 1.8V, 2.5V, 3.3V, 5V Output Voltage.
Adjustable Output Voltage are available from 0.8~5.5V.
Low Dropout：550mV at 2A and 3.3V output voltage, 480mV at 2A and 5V output voltage.
High PSRR：70dB at 1KHz.
Active Low or High Shutdown Control. Current Limit and Thermal Protection.
Available in ±2% Output Tolerance.
Available in SOT-223 & TO-252(3 pin) & SOP- 8 Exposed Pad (Heat Sink) Package.
Applications:
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LCD TV, LCD Monitor, DPF
Networking
STB
DVD, HDD Driver
Portable AV Equipment
PC Peripherals
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Typical application circuit:
Fixed Linear Regulator
Adjustable Linear Regulator in SOP-8 Package
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SULR1221
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Technical Data
Data Sheet N1579, Rev. -
Ordering Information:
PIN CONFIGURATION
SULR1221-XXXXX
TO-252
TOP VIEW
PACKING TYPE
TB: TUBE
TR: TAPING & REEL
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
PACKAGING TYPE
T: TO-252
G: SOT-223
M: SOP-8
SOT-223
FRONT VIEW
OUTPUT VOLTAGE
18: 1.8V
25: 2.5V
30: 3.0V
33: 3.3V
50: 5V
(Of a unit of 0.1V within
0.8~5.5V, additional voltage
versions are available on
demand)
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
SOP-8 Exposed Pad (Heat Sink)
TOP VIEW
———
1: EN / E N
2: VIN
3: VOUT
4: ADJ
5: GND (TAB)
6: BP
7: PG
8: GND (TAB)
———
Example: SULR1221-18GTR EN
1.8V Version, in SOT-223 Green
Package & Tape & Reel Packing Type
Example: SULR1221-18TTR
1.8V version in TO-252 Green
Package &Taping & Reel Packing Type
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SULR1221
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Technical Data
Data Sheet N1579, Rev. -
Ordering Information (Continued)
SULR1221H-XXXXX
PACKING TYPE
TB: TUBE
TR: TAPING & REEL
PACKAGING TYPE
M: SOP-8
OUTPUT VOLTAGE
18: 1.8V
25: 2.5V
33: 3.3V
50: 5.0V
(Of a unit of 0.1V within
0.8~5.5V, additional voltage
versions are available on
demand)
PIN CONFIGURATION
SOP-8 Exposed Pad (Heat Sink)
TOP VIEW
———
1: EN / E N
2: VIN
3: VOUT
4: ADJ
5: GND (TAB)
6: BP
7: GND (TAB)
8: GND (TAB)
ENABLE TYPE
L: Chip Enable Low
H: Chip Enable High
Absolute Maximum Ratings:
Input Voltage ………..................………………………………………………………………………….7V
EN Pin Voltage ……………………………...............…………………………………………………….7V
Noise Bypass Terminal Voltage ………………………………………………………………………..7V
Operating Temperature Range ...………………………………………………………… –40°C to 85°C
Maximum Junction Temperature …………………………………………………………………..150°C
Storage Temperature Range ……………………………………………………………..–65°C ~ 150°C
Lead Temperature (Soldering) 10 sec. ……………………………………………………………260°C
Thermal Resistance Junction to Case TO-252 …………………………………………….……8°C/W
SOT-223………………………………………………..15°C/W
SOP-8 (Exposed Pad*)......................................... 15ºC /W
Thermal Resistance Junction to Ambient
(Assume no ambient airflow, no heatsink) SOT-223……………………..…………………130°C/W
TO-252 …………………………………..…….100°C/W
(Assume no ambient airflow)
SOP-8 (Exposed Pad*)………………….…..60ºC /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
* The package is placed on a two layers PCB with 2 ounces copper and 2 square inch, connected by 8 vias
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Electrical Characteristics
(CIN = Cout = 4.7μF(Note 1), CBP = 22nF, VIN = VOUT + 1V, TJ=25℃, unless otherwise specified)(Note 2)
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Electrical Characteristics (Continued)
Note 1: In the case of Vout <1.8V, 10μF Cout is recommended.
Note 2: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 3: Vin(min) is the higher value of Vout + Dropout Voltage or 1.8V.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Typical Performance Characteristics
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Typical Performance Characteristics (Continued)
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Typical Performance Characteristics (Continued)
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Typical Performance Characteristics (Continued)
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Block Diagram
Pin Descriptions
VIN
GND
VOUT
– Power supply input pin. Bypass with a 4.7μF capacitor to GND
– Ground.
– Regulator Output pin. Sources up to 2A.
———
EN (5 Pin and 8 Pin) – Chip Enable (Active Low). This pin isn’t allowed to float.
EN (5 Pin and 8 Pin) – Chip Enable (Active High). This pin isn’t allowed to float.
BP (5 Pin and 8 Pin) – Bypass pin. It can connect to external 22nF capacitor to GND to reduce output
noise. The bypass pin could be floating if it’s unnecessary.
PGOOD (8 Pin)
– Power Good open Drain output.
ADJ (5 Pin and 8 Pin) –The output voltage can either be set by the internal feedback resistors when
this pin is grounded, or be set by the external feedback resistors when using
a resistive divider.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Application Information
The SULR1221 is a high performance linear regulator that provides low-dropout voltage and low quiescentcurrent. The device is available in an adjustable version and fixed output voltages ranging from 0.8V to 5.5V,
and the device can supply loads up to 2A.
SHUTDOWN __
By connecting EN(EN) pin to VIN(ground), the SULR1221 can be shut down to reduce the supply current to
0.01μA(typ.). At this operation mode, the output voltage of SULR1221 is equal to 0V.
CURRENT LIMIT
The SULR1221 includes a current limiter, which monitors and controls the maximum output current. If the
output is overloaded or shorted to ground, this can protect the device from being damaged.
THERMAL PROTECTION
The SULR1221 includes a thermal-limiting circuit, which is designed to protect the device against overload
condition. When the junction temperature exceeds TJ=150ºC, the thermal-limiting circuit turns off the pass
transistor and allows the IC to cool. For continuous load condition, maximum rating of junction temperature
must not be exceeded.
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors to maintain stability. Input capacitor at a 4.7μF Output
capacitor with a 4.7μF or 10μF (Vout <1.8V, 10μF Cout is recommended) ceramic output capacitor is
recommended. When choosing the input and output ceramic capacitors, X5R and X7R types are
recommended because they retain their capacitance over wider ranges of voltage and temperature than other
types.
NOISE BYPASS CAPACITOR
A 22nF bypass capacitor at BP pin can reduce output voltage noise. The bypass pin can be floating if it’s
unnecessary.
OUTPUT VOLTAGE PROGRAMMING
Its internal feedback resistors can set the output voltage of SULR1221 linear regulator when the ADJ pin is
grounded. In addition, the output voltage of SULR1221 linear regulator can be set by the external feedback
resistors when connecting a resistive divider R1 and R2. While connecting a resistive divider, VOUT can be
calculated as:
R1
}
VOUT = 0.7×{1+
R2
The resistive divider should sit as close to ADJ pin as possible.
POWER DISSIPATION
The maximum power dissipation of SULR1221 depends on the thermal resistance of its case and circuit
board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate
of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and
the ambient temperature. When the IC mounting with good thermal conductivity is used, the junction
temperature will be low even when large power dissipation applies.
The power dissipation across the device is P = I
OUT
(V -V
IN
OUT
).
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
The maximum power dissipation is:
(TJ-max - TA)
PMAX =
RΘJA
Where T
is the maximum allowable junction temperature (150°C), and T is the ambient temperature
J-max
A
suitable in application.
As a general rule, the lower temperature is, the better reliability of the device is. So the PCB mounting pad
should provide maximum thermal conductivity to maintain low device temperature.
LAYOUT CONSIDERATION
Connect the bottom-side pad to a large ground plane. Use as much copper as possible to decrease the
thermal resistance of the device.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
Physical Dimensions
TO-252 (unit: mm)
Note:
1. Refer to JEDEC TO-252AA and AB.
2. Dimension “E” do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side.
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
SOT-223(unit: mm)
Note: 1. Refer to JEDEC TO-261AA.
2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs
shall not exceed 6 mil per side .
3. Dimension "E1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
SOP-8 (unit: mm)
Note: 1. Refer to JEDEC MS-012E.
2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs
shall not exceed 6 mil per side .
3. Dimension "E" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
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SULR1221
Technical Data
Data Sheet N1579, Rev. -
Ultra LDO 2A Linear Regulator With Adjustable & Bypass Pin
DISCLAIMER:
1- The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product
characteristics. Before ordering, purchasers are advised to contact the SMC - Sangdest Microelectronics (Nanjing) Co., Ltd sales
department for the latest version of the datasheet(s).
2- In cases where extremely high reliability is required (such as use in nuclear power control, aerospace and aviation, traffic equipment,
medical equipment , and safety equipment) , safety should be ensured by using semiconductor devices that feature assured safety or by
means of users’ fail-safe precautions or other arrangement .
3- In no event shall SMC - Sangdest Microelectronics (Nanjing) Co., Ltd be liable for any damages that may result from an accident or
any other cause during operation of the user’s units according to the datasheet(s). SMC - Sangdest Microelectronics (Nanjing) Co., Ltd
assumes no responsibility for any intellectual property claims or any other problems that may result from applications of information,
products or circuits described in the datasheets.
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secondary damage resulting from use at a value exceeding the absolute maximum rating.
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