LP3869x-ADJ/Q1 500-mA Low-Dropout CMOS Linear Regulators Stable With Ceramic Output Capacitors
1 Features
- Wide Input Voltage Range: 2.7 V to 10 V
- All WSON Options are Available as AEC-Q100 Grade 1
- Output Voltage Range: 1.25 V to 9 V
- 2% Adjust (ADJ) Pin Voltage Accuracy (25°C)
- Low Dropout Voltage: 250 mV at 500 mA
(Typical, 5-V Out) - Precision (Trimmed) Bandgap Reference
- Ensured Specs for –40°C to +125°C
- 1-µA Off-State Quiescent Current
- Thermal Overload Protection
- Foldback Current Limiting
- Ground (GND) Pin Current: 55 µA (Typical) at Full Load
- Enable (EN) Pin (LP38693-ADJ)
2 Applications
- Hard Disk Drives
- Notebook Computers
- Battery-Powered Devices
- Portable Instrumentation
3 Description
The LP3869x-ADJ low-dropout CMOS linear regulators provide 2% precision reference voltage, extremely low dropout voltage (250 mV at 500-mA load current, VOUT = 5 V), and excellent AC performance using ultra-low equivalent series resistance (ESR) ceramic output capacitors.
The low thermal resistance of the WSON and SOT-223 packages allow use of the full operating current even in high ambient temperature environments.
The use of a PMOS power transistor means that no DC base drive current is required to bias it, thus allowing the GND-pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LP38691-ADJ | WSON (6) | 3.00 mm × 3.00 mm |
| LP38693-ADJ | SOT-223 (5) | 6.50 mm × 3.56 mm |
| WSON (6) | 3.00 mm × 3.00 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application Circuits
4 Revision History
Changes from J Revision (October 2015) to K Revision
- Added Caution note to Foldback Current Limiting subsection Go
Changes from I Revision (April 2013) to J Revision
- Added Device Information and Pin Configuration and Functions sections, ESD Ratings table, update Thermal Values; add Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections; update Vin, Vout and Ven pin names to IN, OUT, and EN in text and graphics; modified wording of Description to eliminate redundancy; added top nav icon for reference design.Go
Changes from H Revision (April 2013) to I Revision
5 Pin Configuration and Functions
Pin Functions
| PIN | I/O | DESCRIPTION | |||
|---|---|---|---|---|---|
| LP38691-ADJ | LP38693-ADJ | ||||
| NAME | WSON | WSON | SOT-223 | ||
| DAP | √ | √ | — | — | WSON Only - The DAP (exposed pad) functions as a thermal connection when soldered to a copper plane. See WSON Mounting section for more information. |
| EN | — | 3 | 1 | I | The EN pin allows the part to be turned to an ON or OFF state by pulling this pin high or low. |
| GND | 2 | 2 | 5 | — | Circuit ground for the regulator. For the SOT-223 package this is thermally connected to the die and functions as a heat sink when the soldered down to a large copper plane. |
| IN | 1, 6 | 1, 6 | 4 | I | This is the input supply voltage to the regulator. For WSON devices, both IN pins must be tied together for full current operation (250 mA maximum per pin). |
| N/C | 3 | — | — | — | No internal connection. |
| ADJ | 4 | 4 | 2 | O | The ADJ pin is used to set the regulated output voltage by connecting it to the external resistors R1 and R2 (see Typical Application Circuits). |
| OUT | 5 | 5 | 3 | I | Regulated output voltage. |
