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Linear & low-dropout (LDO) regulators

UA78L

ACTIVE

100-mA 30-V linear voltage regulator

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Data sheet

UA78L

ACTIVE
Data sheet Order now

Product details

Output options Fixed Output Iout (max) (A) 0.1 Vin (max) (V) 30 Vin (min) (V) 4.75 Vout (max) (V) 15 Vout (min) (V) 2.6 Fixed output options (V) 2.6, 3.3, 5, 6.2, 8, 9, 10, 12, 15 Rating Catalog Noise (µVrms) 42 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 3.8 Thermal resistance θJA (°C/W) 55 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3.75 Dropout voltage (Vdo) (typ) (mV) 1700 Operating temperature range (°C) -40 to 125
Output options Fixed Output Iout (max) (A) 0.1 Vin (max) (V) 30 Vin (min) (V) 4.75 Vout (max) (V) 15 Vout (min) (V) 2.6 Fixed output options (V) 2.6, 3.3, 5, 6.2, 8, 9, 10, 12, 15 Rating Catalog Noise (µVrms) 42 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 3.8 Thermal resistance θJA (°C/W) 55 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3.75 Dropout voltage (Vdo) (typ) (mV) 1700 Operating temperature range (°C) -40 to 125
SOIC (D) 8 29.4 mm² 4.9 x 6 SOT-89 (PK) 3 18.4275 mm² 4.5 x 4.095 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68
  • Input voltage range (V I): 4.75 V to 35 V
  • Output voltage range (V O):
    • 2.6 V to 15 V (for legacy chip)
    • 3.3 V to 15 V (for new chip)
  • Output current: Up to 100 mA
  • Quiescent current I Q: 3.8 mA
  • Built-in short-circuit current limiting and thermal protection
  • Stable without any external component
  • Supported temperature range:
    • Legacy chip C and AC versions: 0°C to +125°C
    • Legacy chip AI version: –40°C to +125°C
    • New chip: –40°C to +125°C
  • Packages:
    • 8-pin, 4.9-mm × 3.91-mm SOIC
    • 3-pin, 4.3-mm × 4.3-mm TO-92
    • 3-pin, 4.5-mm × 2.5-mm SOT-89
  • Input voltage range (V I): 4.75 V to 35 V
  • Output voltage range (V O):
    • 2.6 V to 15 V (for legacy chip)
    • 3.3 V to 15 V (for new chip)
  • Output current: Up to 100 mA
  • Quiescent current I Q: 3.8 mA
  • Built-in short-circuit current limiting and thermal protection
  • Stable without any external component
  • Supported temperature range:
    • Legacy chip C and AC versions: 0°C to +125°C
    • Legacy chip AI version: –40°C to +125°C
    • New chip: –40°C to +125°C
  • Packages:
    • 8-pin, 4.9-mm × 3.91-mm SOIC
    • 3-pin, 4.3-mm × 4.3-mm TO-92
    • 3-pin, 4.5-mm × 2.5-mm SOT-89

The UA78L series of fixed-voltage linear regulators is designed for a wide range of applications. The UA78L series can be used for on-card regulation to eliminate the noise and distribution problems associated with single-point regulation. The UA78L can also be used with power-pass elements to make high-current voltage regulators. The UA78L series regulators can deliver up to 100 mA of output current. Additionally, the UA78L does not need an external capacitor for stable operation across the load current range. The internal current-limiting and thermal-shutdown features of these regulators help protect the device from overload.

For the legacy chip, the UA78L00C and UA78L00AC series are characterized for the junction temperature range of 0°C to +125°C and the UA78L05AI device is characterized for the operating junction temperature range of –40°C to +125°C.

For the new chip, the UA78L series is characterized for the junction temperature range of –40°C to +125°C.

The UA78L series of fixed-voltage linear regulators is designed for a wide range of applications. The UA78L series can be used for on-card regulation to eliminate the noise and distribution problems associated with single-point regulation. The UA78L can also be used with power-pass elements to make high-current voltage regulators. The UA78L series regulators can deliver up to 100 mA of output current. Additionally, the UA78L does not need an external capacitor for stable operation across the load current range. The internal current-limiting and thermal-shutdown features of these regulators help protect the device from overload.

For the legacy chip, the UA78L00C and UA78L00AC series are characterized for the junction temperature range of 0°C to +125°C and the UA78L05AI device is characterized for the operating junction temperature range of –40°C to +125°C.

For the new chip, the UA78L series is characterized for the junction temperature range of –40°C to +125°C.
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Technical documentation

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* Data sheet UA78L Series Positive-Voltage Linear Regulators datasheet (Rev. X) PDF | HTML 23 Jun 2023
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UA78LEVM-075 — UA78L evaluation module for 100-mA 30-V linear voltage regulator

The UA78L evaluation module (EVM) is a platform for evaluating the operation and performance of the UA78L linear regulator in the PK package. This EVM configuration contains a single 100-mA, three-terminal, low-dropout (LDO) regulator for general applications. The regulator is capable of delivering (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

UA78L PK PSpice Model

SLVME11.ZIP (17 KB) - PSpice Model
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Reference designs

PMP15038 — 50A, 0.05% Current Accuracy Power Reference Design for Battery Test Systems

This reference design introduces a large current, highly accurate and bi-directional power solution used in battery test systems (BTS). It includes a LM5170EVM-BIDIR and a signal control board. The LM5170EVM-BIDIR is an evaluation board  to showcase the high performance of the dual-channel (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP15043 — 6A, 0.05% Current Accuracy Power Solution for Battery Test Systems Reference Design

This reference design circuit introduces a highly accurate, bi-directional current power solution used in battery test systems (BTS). The maximum current capability is 6A with lower than 0.05% full scale accuracy. Controlling through a logic pin, the circuit can be used to charge or discharge a (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
SOT-89 (PK) 3 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian
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