Low drop adjustable positive voltage regulator - BA1117FP

The BA1117FP is a low drop voltage regulator able to provide up to 1 A of output current, available in adjustable versions (VREF=1.25V). The device is supplied in: TO252-3 and TO220-3. Surface mounted packages optimize the thermal characteristics while offering a relevant space saving advantage. High efficiency is assured by NPN pass transistor. Only a very common 22uF minimum capacitor is needed for stability. Chip trimming allows the regulator to reach a very tight reference voltage tolerance, within ±1% at 25?.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BA1117FP-E2 Active TO252-3 2000 2000 Taping Yes
Grade Standard
ch 1
Vin(Min.)[V] 2.15
Vin(Max.)[V] 10.0
Vout (Typ.) [V] 1.25 to 8.6
Vout Precision ±1
Iout(Max.)[A] 1.0
Shutdown Function No
Thermal Shut-down Yes
Over Current Protection Yes
Over Voltage Protection No
Discharge Function No
Soft Start No
Operating Temperature (Min.)[°C] -20
Operating Temperature (Max.)[°C] 105
  • · Low dropout voltage: 1.2 V typ. (at Io= 1 A, 25℃)
    · Output current up to 1 A
    · Adjustable version availability (VREF= 1.25 V)
    · Internal current and thermal limit
    · Available in ±1% (at 25℃) and 2% in full temperature range
    · High supply voltage rejection: 75 dB typ. (at 25℃)
    · Temperature range: -20℃to 105℃
    · Designed to use byceramic capacitors
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Technical Data
Table of resistance for output voltage setting on linear regulator Ics

This application notes provide tables for each series so that it is easy to set the resistance value for the output voltage setting from various internal reference voltages VREF.

Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.

BA1117 Series PCB Layout

The basic terminal configuration of a linear regulator IC consists of four parts: input, output, GND, and feedback…

Basics of Linear Regulators

A linear regulator, also referred to as a "three-terminal regulator" or "dropper," is a power supply long known to many designers owning to its simple circuitry and ease of use...

Linear Regulator Specifications

Very important information such as maximum ratings, operating conditions and characteristic graphs are described in the table.

Reverse Voltage Protection

A linear regulator integrated circuit (IC) is a DC-to-DC buck converter system that reduces a DC supply from higher voltage level to a lower voltage level...

Simple Test Method for Estimating the Stability of Linear Regulators

Low drop-out (LDO) regulators developed back in the age when large-capacitance multi-layer ceramic capacitors (hereinafter, MLCCs) were uncommon cause a phase delay, leading to oscillation when connected to a low-ESR capacitor like an MLCC...

Thermal Calculation for Linear Regulator

The loss in linear regulators increases as the difference between the input and output voltages increases. Since most of the loss is converted to heat, a very large amount of heat may be generated in some conditions...

Power Source ON/OFF Characteristics for Linear Regulator

When a linear regulator IC is turned ON, the electric charge is stored in the output capacitor and the output voltage increases up to the specified value.

BAxxCC0 Series Circuit Using a Ceramic Output Capacitor

This application note proposes a circuit using an output ceramic capacitor that allows a stable phase compensation.

Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)

This application note introduces a method for easily measuring the phase margin with a Frequency Response Analyzer (FRA) made by NF Corporation.

Connecting LDOs in Parallel

Provides some hints on how to connect LDOs in parallel.