UCC381DP-5

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Texas Instruments

1-A, LOW-DROPOUT VOLTAGE REGULATOR WITH REVERSE CURRENT PROTECTION FROM 0°C TO 70°C

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DocumentsDatasheet Low Dropout 1 Ampere Linear Regulator Family datasheet (Rev. B)

UCC381DP-5

Active

Texas Instruments

1-A, LOW-DROPOUT VOLTAGE REGULATOR WITH REVERSE CURRENT PROTECTION FROM 0°C TO 70°C

Deep-Dive with AI

DocumentsDatasheet Low Dropout 1 Ampere Linear Regulator Family datasheet (Rev. B)

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UCC381DP-5

Current - Output	1 A
Current - Quiescent (Iq)	650 µA
Mounting Type	Surface Mount
Number of Regulators	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Configuration	Positive
Output Type	1.81 mOhm
Package / Case	8-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Protection Features	Under Voltage Lockout (UVLO), Reverse Polarity, Over Temperature, Short Circuit
Supplier Device Package	8-SOIC
Voltage - Input (Max) [Max]	9 V
Voltage - Output (Min/Fixed)	5 V
Voltage Dropout (Max) [Max]	0.6 V

UCC381 Series

Part	Package / Case	Package / Case [y]	Package / Case [x]	Current - Quiescent (Iq)	Number of Regulators	Voltage - Input (Max) [Max]	Supplier Device Package	Mounting Type	Output Type	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Max) [Max]	Output Configuration	Current - Output	Protection Features	Voltage Dropout (Max) [Max]	Output Type	Voltage - Output (Min/Fixed)	Type	Function	Supplied Contents	Utilized IC / Part
Texas Instruments UCC381DPTR-ADJ	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount	Adjustable	70 °C	0 °C	8.85 V	Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.6 V
Texas Instruments UCC381DP-5G4	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount		70 °C	0 °C		Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.6 V	1.81 mOhm	5 V
Texas Instruments UCC381DP-ADJ	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount	Adjustable	70 °C	0 °C	8.85 V	Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.6 V
Texas Instruments UCC381DPTR-3	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount		70 °C	0 °C		Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.8 V	1.81 mOhm	3.3 V
Texas Instruments UCC381DPTR-5	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount		70 °C	0 °C		Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.6 V	1.81 mOhm	5 V
Texas Instruments UCC381DP-5	8-SOIC	3.9 mm	0.154 in	650 µA	1	9 V	8-SOIC	Surface Mount		70 °C	0 °C		Positive	1 A	Over Temperature Reverse Polarity Short Circuit Under Voltage Lockout (UVLO)	0.6 V	1.81 mOhm	5 V
Texas Instruments UCC3817EVM																			Power Management	Power Factor Correction	Board(s)	UCC3817

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	225	$ 4.53
Texas Instruments	TUBE	1	$ 5.43
		100	$ 4.43
		250	$ 3.48
		1000	$ 2.95

Description

General part information

UCC381 Series

The UCC381-3/-5/-ADJ family of positive linear series pass regulators is tailored for low drop out applications where low quiescent power is important. Fabricated with a BiCMOS technology ideally suited for low input to output differential applications, the UCC381 will pass 1A while requiring only 0.5V of input voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 200mA is less than 100mV. Quiescent current is always less than 650uA. To prevent reverse current conduction, on-chip circuitry limits the minimum forward voltage to typically 50mV. Once the forward voltage limit is reached, the input-output differential voltage is maintained as the input voltage drops until undervoltage lockout disables the regulator.

UCC381-3 and UCC381-5 versions have on-chip resistor networks preset to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing of the load voltage is possible by connecting the VOUTS pin directly at the load. The output voltage is then regulated to 1.5% at room temperature and better than 2.5% over temperature. The UCC381-ADJ version has a regulated output voltage programmed by an external user-definable resistor ratio.

Short circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a TONdelay. The device then stays off for a period, TOFF, that is 32 times the TONdelay. The device then begins pulsing on and off at the TON/(TON+TOFF) duty cycle of 3%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. On the fixed output versions of the device TON is fixed at 400us - a guaranteed minimum. On the adjustable version an external capacitor sets the on time. The off time is always 32 times TON.