Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable TO 263 5 slimline

LP38501-ADJ, LP38503-ADJ

www.ti.com

SNVS522H –AUGUST 2007–REVISED APRIL 2013

LP38501/3-ADJ, LP38501A/3A-ADJ 3A FlexCap Low Dropout Linear Regulator for 2.7V to

5.5V Inputs

Check for Samples: LP38501-ADJ, LP38503-ADJ

FEATURES

DESCRIPTION

• FlexCap: Stable with Ceramic, Tantalum, or

TI's FlexCap LDO's feature unique compensation that

Aluminum Capacitors

allows the use of any type of output capacitor with no

• Stable with 10 µF Input/Output Capacitor

limits on minimum or maximum ESR. The LP38501/3

• Adjustable Output Voltage from 0.6V to 5V

series of low-dropout linear regulators operates from

a +2.7V to +5.5V input supply. These ultra low

• Low Ground Pin Current

dropout linear regulators respond very quickly to step

• 25 nA Quiescent Current in Shutdown Mode

changes in load, which makes them suitable for low

• Output Current of 3A

voltage microprocessor applications. Developed on a

CMOS process, (utilizing a PMOS pass transistor),

• Available in TO-263, PFM THIN Packages

the LP38501/3 has low quiescent current that

• V

ADJ

Accuracy of ±1.5% at 25°C (A Grade)

changes little with load current.

• V

ADJ

Accuracy of ±3.5% at 25°C (STD)

Ground Pin Current: Typically 2 mA at 3A load

• Over-Temperature and Over-Current

current.

Protection

Disable Mode: Typically 25 nA quiescent current

• −40°C to +125°C Operating T

Range

when the Enable pin is pulled low.

• Enable Pin (LP38501)

Simplified Compensation: Stable with any type of

output capacitor, regardless of ESR.

APPLICATIONS

Precision Output: "A" grade versions available with

• ASIC Power Supplies In:

1.5% V

ADJ

tolerance (25°C) and 3% over line, load

– Printers, Graphics Cards, DVD Players

and temperature.

– Set Top Boxes, Copiers, Routers

• DSP and FPGA Power Supplies

• SMPS Regulator

• Conversion from 3.3V or 5V Rail

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 (22 pages)

PAGE 1
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 LP38501/3-ADJ, LP38501A/3A-ADJ 3A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs Check for Samples: LP38501-ADJ, LP38503-ADJ FEATURES 1 • 2 • • • • • • • • • • • FlexCap: Stable with Ceramic, Tantalum, or Aluminum Capacitors Stable with 10 µF Input/Output Capacitor Adjustable Output Voltage from 0.
PAGE 2
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com Typical Application Circuit These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 Pin Descriptions for TO-263 (TS) and TO-263 THIN (TJ) (continued) Pin # Designation 2 IN Function 3 GND Ground 4 OUT Regulated Output Voltage Pin 5 ADJ Sets output voltage DAP DAP The DAP is used as a thermal connection to remove heat from the device to the circuit board copper clad area which acts as the heatsink. The DAP is electrically connected to the backside of the die.
PAGE 4
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS, LP38501/3–ADJ Unless otherwise specified: VIN = 3.3V, IOUT = 10 mA, CIN = 10 µF, COUT = 10 µF, VEN = VIN, VOUT = 1.8V. 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
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: TJ = 25°C, VIN = 2.7V, VEN = VIN, CIN = 10 µF, COUT = 10 µF, IOUT = 10 mA, VOUT = 1.8V Noise Density Noise Density Figure 1. Figure 2. IGND vs Load Current IGND(OFF) vs Temperature Figure 3. Figure 4. VADJ vs Temperature Dropout Voltage vs Load Current Figure 5. Figure 6.
PAGE 6
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TJ = 25°C, VIN = 2.7V, VEN = VIN, CIN = 10 µF, COUT = 10 µF, IOUT = 10 mA, VOUT = 1.8V 6 VEN vs Temperature Turn-on Characteristics Figure 7. Figure 8. Load Regulation vs Temperature Turn-on Time Figure 9. Figure 10. Turn-on Time PSRR Figure 11. Figure 12.
PAGE 7
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 Block Diagrams Figure 13. LP38501-ADJ Block Diagram Figure 14. LP38503-ADJ Block Diagram APPLICATION INFORMATION EXTERNAL CAPACITORS The LP3850X requires that at least 10 µF (±20%) capacitors be used at the input and output pins located within one cm of the IC. Larger capacitors may be used without limit on size for both CIN and COUT.
PAGE 8
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com SETTING THE OUTPUT VOLTAGE The output voltage of the LP38501/3-ADJ can be set to any value between 0.6V and 5V using two external resistors shown as R1 and R2 in Figure 15. Figure 15. The value of R2 should always be less than or equal to 10 kΩ for good loop compensation.
PAGE 9
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 Figure 17. Gain-Bandwidth Plot for No Load The reduction in unity-gain bandwidth as load current is reduced is normal for any LDO regulator using a P-FET or PNP pass transistor, because they have a pole in the loop gain function given by: (2) This illustrates how the pole goes to the highest frequency when RL is minimum value (maximum load current).
PAGE 10
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com When the load current changes much more quickly, the output voltage will show more change because the loop and internal feedforward circuitry are not able to react as fast as the load changes. In such cases, it is the output capacitor which must supply load current during the transition until the loop responds and changes the pass transistor’s drive to deliver the new value of load current.
PAGE 11
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 As a first example, larger values of ceramic capacitance will be tried to show how much reduction can be obtained from the 200 mV output change (Figure 20) which was seen with only a 10 µF ceramic output capacitor. In Figure 21, the 10 µF output capacitor is increased to 22 µF. The 200 mV transient is reduced to about 160 mV, which is from about 11% of VOUT down to about 9%. Figure 21.
PAGE 12
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com A solid Tantalum should work better, so the aluminum electrolytic is replaced by a 220 µF Tantalum (Figure 24). The peak amplitude of the output transient is now reduced to about 130 mV, just slightly worse than the value of the 47 µF ceramic alone. Figure 24. 10 µF Ceramic Paralleled By 220 µF Tantalum The OSCON (ultra low ESR) aluminum electrolytic is the best of the electrolytics.
PAGE 13
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 If RFI/EMI noise is present on the input side of the regulator (such as applications where the input source comes from the output of a switching regulator), good ceramic bypass capacitors must be used at the input pin of the IC to reduce the amount of EMI conducted into the IC.
PAGE 14
LP38501-ADJ, LP38503-ADJ SNVS522H – AUGUST 2007 – REVISED APRIL 2013 www.ti.com REVERSE CURRENT PATH The internal MOSFET pass element in the LP38501/3-ADJ has an inherent parasitic diode. During normal operation, the input voltage is higher than the output voltage and the parasitic diode is reverse biased. However, if the output is pulled above the input in an application, then current flows from the output to the input as the parasitic diode gets forward biased.
PAGE 15
LP38501-ADJ, LP38503-ADJ www.ti.com SNVS522H – AUGUST 2007 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision G (April 2013) to Revision H • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.
PAGE 17
PACKAGE OPTION ADDENDUM www.ti.com (4) 21-May-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 29-May-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) LP38501ATJ-ADJ/NOPB TO-263 NDQ 5 1000 330.0 24.4 LP38501TJ-ADJ/NOPB 10.6 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 15.4 2.45 12.0 24.0 Q2 TO-263 NDQ 5 1000 330.0 24.4 10.6 15.4 2.45 12.0 24.0 Q2 LP38501TSX-ADJ/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.
PAGE 19
PACKAGE MATERIALS INFORMATION www.ti.com 29-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP38501ATJ-ADJ/NOPB TO-263 NDQ 5 1000 367.0 367.0 35.0 LP38501TJ-ADJ/NOPB TO-263 NDQ 5 1000 367.0 367.0 35.0 LP38501TSX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LP38503ATJ-ADJ/NOPB TO-263 NDQ 5 1000 367.0 367.0 35.0 LP38503TJ-ADJ/NOPB TO-263 NDQ 5 1000 367.0 367.0 35.
PAGE 20
MECHANICAL DATA NDQ0005A TJ5A (Rev F) www.ti.
PAGE 21
MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.
PAGE 22
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.