Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positive, fixed TO 263 5

BIAS

GND

OUT

BIAS

10 PF Ceramic

OUT

10 PF

Ceramic

BIAS

1 PF

GND

LP38856-x.x

LP38856

www.ti.com

SNVS336E –JUNE 2006–REVISED APRIL 2013

3A Fast-Response High-Accuracy LDO Linear Regulator with Enable

Check for Samples: LP38856

FEATURES

DESCRIPTION

The LP38856 is a high-current, fast-response

• Standard V

OUT

Values of 0.8V and 1.2V

regulator which can maintain output voltage

• Wide V

BIAS

Supply Operating Range of 3.0V to

regulation with an extremely low input to output

5.5V

voltage drop. Fabricated on a CMOS process, the

• Stable with 10 µF Ceramic Capacitors

device operates from two input voltages: V

BIAS

provides power for the internal bias and control

• Dropout Voltage of 240 mV (Typical) at 3A

circuits, as well as drive for the gate of the N-MOS

Load Current

power transistor, while V

supplies power to the load.

• Precision Output Voltage Across all Line and

The use of an external bias rail allows the part to

Load Conditions:

operate from ultra low V

voltages. Unlike bipolar

regulators, the CMOS architecture consumes

– ±1.0% for T

= 25°C

extremely low quiescent current at any output load

– ±2.0% for 0°C ≤ T

≤ +125°C

current. The use of an N-MOS power transistor

– ±3.0% for -40°C ≤ T

≤ +125°C

results in wide bandwidth, yet minimum external

• Over-Temperature and Over-Current capacitance is required to maintain loop stability.

Protection

The fast transient response of this device makes it

• Available in 5 Lead TO-220 and DDPAK/TO-263

suitable for use in powering DSP, Microcontroller

Packages

Core voltages and Switch Mode Power Supply post

regulators. The LP38856 is available in TO-220 and

• Custom V

OUT

Values Between 0.8V and 1.2V

DDPAK/TO-263 5-Lead packages.

are Available

Dropout Voltage: 240 mV (typical) at 3A load

• -40°C to +125°C Operating Temperature Range

current.

APPLICATIONS

Low Ground Pin Current: 10 mA (typical) at 3A load

current.

• ASIC Power Supplies In:

– Desktops, Notebooks, and Graphics Cards,

Shutdown Current: 1 µA (typical) I

IN(GND)

when EN

pin is low.

Servers

– Gaming Set Top Boxes, Printers and

Precision Output Voltage: ±1.0% for T

= 25°C and

Copiers

±2.0% for 0°C ≤ T

≤ +125°C, across all line and load

conditions

• Server Core and I/O Supplies

• DSP and FPGA Power Supplies

• SMPS Post-Regulator

Typical Application Circuit

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (20 pages)

PAGE 1
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable Check for Samples: LP38856 FEATURES DESCRIPTION • • The LP38856 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input to output voltage drop.
PAGE 2
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Connection Diagram TAB IS GND EN 1 EN 1 IN 2 GND 3 OUT 4 BIAS 5 LP38856T-x.x GND 3 OUT 4 LP38856S-x.x IN 2 TAB IS GND BIAS 5 Figure 1. DDPAK/TO-263 – Top View See Package Number KTT0005B Figure 2. TO-220 – Top View See Package Number NDH0005D PIN DESCRIPTIONS TO-220–5 and DDPAK/TO-263–5 Packages Pin # Pin Symbol 1 EN The device Enable pin.
PAGE 3
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 Operating Ratings (1) VIN Supply Voltage (VOUT + VDO) to VBIAS VBIAS Supply Voltage 3.0V to 5.5V VEN Enable Input Voltage 0.0V to VBIAS IOUT 0 mA to 3.0A Junction Temperature Range (1) (2) (2) −40°C to +125°C Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits.
PAGE 4
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) Unless otherwise specified: VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1µF, VEN = VBIAS. Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation.
PAGE 5
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 Typical Performance Characteristics Unless otherwise specified: TJ = 25°C, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF Ceramic, CBIAS = 1 µF Ceramic, VEN = VBIAS. VBIAS Ground Pin Current (IGND(BIAS)) vs VBIAS VBIAS Ground Pin Current (IGND(BIAS)) vs Temperature Figure 3. Figure 4. VIN Ground Pin Current (IGND(IN)) vs Temperature Load Regulation vs Temperature Figure 5. Figure 6.
PAGE 6
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: TJ = 25°C, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF Ceramic, CBIAS = 1 µF Ceramic, VEN = VBIAS. 6 VOUT vs Temperature UVLO Thresholds vs Temperature Figure 9. Figure 10. Enable Thresholds (VEN) vs Temperature Enable Pull-Down Current (IEN) vs Temperature Figure 11. Figure 12.
PAGE 7
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: TJ = 25°C, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF Ceramic, CBIAS = 1 µF Ceramic, VEN = VBIAS. VIN Line Transient Response VBIAS Line Transient Response Figure 15. Figure 16. VBIAS Line Transient Response Load Transient Response, COUT = 10 μF Ceramic Figure 17. Figure 18.
PAGE 8
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: TJ = 25°C, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF Ceramic, CBIAS = 1 µF Ceramic, VEN = VBIAS. 8 Load Transient Response, COUT = 100 μF Ceramic Load Transient Response, COUT = 100 μF Tantalum Figure 21. Figure 22. Load Transient Response, COUT = 100 μF Tantalum VBIAS PSRR Figure 23. Figure 24. VIN PSRR Output Noise Figure 25.
PAGE 9
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 Block Diagram OUT IN LP38856-x.x BIAS Under-Voltage Lock-Out Thermal Shut Down rEN EN Enable 1.2V VREF ILIMIT GND 0.6V APPLICATION INFORMATION EXTERNAL CAPACITORS To assure regulator stability, capacitors are required on the input, output and bias pins as shown in the Typical Application Circuit. Output Capacitor A minimum output capacitance of 10 µF, ceramic, is required for stability.
PAGE 10
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Bias Capacitor The capacitor on the bias pin must be at least 1 µF. It can be any good quality capacitor (ceramic is recommended). INPUT VOLTAGE The input voltage (VIN) is the high current external voltage rail that will be regulated down to a lower voltage, which is applied to the load. The input voltage must be at least VOUT + VDO, and no higher than whatever value is used for VBIAS.
PAGE 11
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 POWER DISSIPATION AND HEAT-SINKING A heat-sink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The total power dissipation of the device is the sum of three different points of dissipation in the device.
PAGE 12
LP38856 SNVS336E – JUNE 2006 – REVISED APRIL 2013 www.ti.com Heat-Sinking The DDPAK/TO-263 Package The DDPAK/TO-263 package has a θJA rating of 60°C/W, and a θJC rating of 3°C/W. These ratings are for the package only, no additional heat-sinking, and with no airflow. The DDPAK/TO-263 package uses the copper plane on the PCB as a heat-sink. The tab of this package is soldered to the copper plane for heat-sinking.
PAGE 13
LP38856 www.ti.com SNVS336E – JUNE 2006 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision D (April 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) LP38856S-0.8/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP38856S 0.8 LP38856S-1.2/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LP38856S 1.2 LP38856SX-0.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LP38856SX-0.8/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 LP38856SX-1.2/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.75 14.85 5.0 16.0 24.0 Q2 10.75 14.85 5.0 16.0 24.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP38856SX-0.8/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LP38856SX-1.2/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.
PAGE 18
MECHANICAL DATA NDH0005D www.ti.
PAGE 19
MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.
PAGE 20
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