DATA SHEET
LP38513 3-A Fast Response Ultra-Low Dropout Linear Regulator
1 Features
- Input Supply Voltage 2.25 V to 5.5 V
- Conversions from 2.5-V Rail to 1.8-V Rail
- Stable with Ceramic Capacitors
- Low Ground Pin Current
- Load Regulation of 0.1% for 10 mA to 3-A Load Current
- 60-μA Typical Quiescent Current in Shutdown Mode
- Specified Output Current of 3 A
- Specified VOUT Accuracy of ±2.6% With
TJ from 0°C to +125°C - ERROR Flag Indicates VOUT Status
- Overtemperature and Overcurrent Protection
- −40°C to +125°C Operating TJ Range
2 Applications
- Microprocessor Power Supplies
- GTL, GTL+, BTL, and SSTL Bus Terminators
- Power Supplies for DSPs
- SCSI Terminator
- Post Regulators
- Battery Chargers
- Other Battery Powered Applications
3 Description
The LP38513 fast-response ultra-low dropout linear regulator operates from a 2.25-V to 5.5-V input supply. This device responds very quickly to step changes in line or load conditions, making it suitable for low-voltage microprocessor applications. Developed on a CMOS process, with a PMOS pass transistor, the LP38513 has low quiescent-current operation independent of the output load current.
- Ground Pin Current: Typically 12 mA at 3-A load current.
- Disable Mode: Typically 60 µA quiescent current when the enable (EN) pin is pulled low.
- ERROR Flag: The ERROR flag goes low if VOUT falls more than typically 15% below the nominal value.
- Precision Output Voltage: A specified VOUT accuracy of ±2.6% with TJ from 0°C to 125°C.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LP38513 | TO-220 (5) | 14.986 mm × 10.16 mm |
| DDPAK/TO-263 (5) | 10.16 mm × 8.42 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application
4 Revision History
Changes from D Revision (April 2013) to E Revision
- Added Device Information and Pin Configuration and Functions sections, ESD Ratings table, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sectionsGo
- Deleted lead temp from Abs Max - it is in POA Go
- Added updated thermal information Go
- Deleted out-of-date heat sinking subsection Go
Changes from C Revision (April 2013) to D Revision
- Changed layout of National Data Sheet to TI format Go
5 Pin Configuration and Functions
NDH Package
5-Pin TO-220
Top View
KTT Package
5-Pin DDPAK/TO-263
Top View
Pin Functions for TO-220 and DDPAK/TO-263 Packages
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NUMBER | NAME | ||
| 1 | EN | I | Enable. Pull high to enable the output, low to disable the output. This pin has no internal bias and must be tied to the input voltage, or actively driven. |
| 2 | IN | I | Input supply pin |
| 3 | GND | G | Ground |
| 4 | OUT | O | Regulated output voltage pin |
| 5 | ERROR | O | ERROR flag. A high level indicates that VOUT is within 15% of the nominal regulated voltage. |
| TAB | TAB | G | The TO-220 and DDPAK/TO-263 TAB is used as a thermal connection to remove heat from the device to an external heat sink. The TAB is internally connected to device pin 3. |
