L4931CD50

Low Dropout Linear Regulator

The L4931CD50 is a low dropout linear regulator from STMicroelectronics. View the full L4931CD50 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

L4931CD50 shares its datasheet with L4931CD33, whose page lists every part number it covers.

Official L4931CD50 datasheet (PDF) — the source this page was extracted from.

Manufacturer

STMicroelectronics

L4931CD50 Key Specifications

Parameter	Value
Output Current	up to 250 mA
Output Voltage	5 V (4.9 V to 5.1 V at 25 C, C grade 2%)
Dropout Voltage	0.4 V typ, 0.6 V max at 250 mA
Output Capacitor	2.2 uF min (ESR 0.1 to 10 ohm)
Input Voltage (Max)	20 V
Output Current Limit	300 mA typ
Output Noise Voltage	50 uV (10 Hz to 100 kHz)
Control Input Logic Low	0.8 V max
Quiescent Current (OFF)	50 uA typ, 100 uA max
Control Input Logic High	2 V min
Supply Voltage Rejection	70 dB typ at 120 Hz
Operating Junction Temperature	-40 C to 125 C
Quiescent Current (ON, 250 MA)	4 mA typ, 6 mA max
Quiescent Current (ON, No Load)	0.6 mA typ, 1 mA max
Thermal Resistance Junction-Ambient (SO-8)	55 C/W

L4931CD50 Overview

Part: L4931 — STMicroelectronics

Type: Very Low Drop Voltage Regulator

Description: The L4931 is a very low drop voltage regulator with a 0.4 V typical dropout voltage, supporting output currents up to 250 mA, and available in fixed output voltages of 3.3 V, 3.5 V, and 5 V.

Operating Conditions:

Supply voltage: Up to 20 V
Operating temperature: -40 to 125 °C
Output current: Up to 250 mA

Absolute Maximum Ratings:

Max supply voltage: 20 V
Max continuous current: Internally limited mA
Max junction/storage temperature: 150 °C

Key Specs:

Dropout voltage: 0.4 V (typ) at I_O = 250 mA
Quiescent current (ON mode): 0.6 mA (typ) at I_O = 0 mA
Quiescent current (OFF mode): 50 μA (typ) at V_I = 6 V
Output current limit: 300 mA (typ)
Output noise voltage: 50 μV (typ) at B = 10 Hz to 100 kHz
Supply voltage rejection: 70 dB (typ) for 5 V version at f = 1 kHz
Output voltage accuracy: ±1% (AB) or ±2% (C) at 25 °C
Minimum output bypass capacitance for stability: 2.2 μF

Features:

Very low dropout voltage (0.4 V)
Very low quiescent current
Logic controlled electronic shutdown
Internal current and thermal limit
Only 2.2 μF for stability
Available in ±1% (AB) or 2% (C) selection at 25 °C
Automotive-grade product available (3.3 V V_OUT in SO-8 package only)

Applications:

Low noise, low power applications
Battery-powered systems

Package:

SO-8
DPAK
TO-92

L4931CD50 Features

Very low dropout voltage (0.4 V)
Very low quiescent current
Typ. 50 μA in OFF mode, 600 μA in ON mode
Output current up to 250 mA
Logic controlled electronic shutdown
Output voltages: 3.3; 3.5; 5;
Automotive-grade product: 3.3 V V OUT in SO-8 package only
Internal current and thermal limit
Only 2.2 μF for stability
Available in ± 1 % (AB) or 2 % (C) selection at 25 °C
Supply voltage rejection: 70 dB typ. for 5 V version
Temperature range: from -40 to 125 °C

L4931CD50 Pin Configuration

Figure 2. Pin connections (top view)

L4931CD50 Electrical Characteristics

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 3. L4931ABxx33 electrical characteristics

Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 5.3 V		3.267	3.3	3.333	V
V O	Output voltage	I O = 5 mA, V I = 5.3 V, T A = -25 to 85 °C		3.234		3.366	V
V I	Operating input voltage	I O = 250 mA				20	V
I out	Output current limit				300		mA
∆V O	Line regulation	V I = 4 to 20 V, I O = 0.5 mA			3	15	mV
∆V O	Load regulation (1)	V I = 4.2 V, I O = 0.5 to 250 mA			3	15	mV
I d	Quiescent current	V I = 4.2 to 20 V, I O = 0 mA			0.6	1	mA
I d	ON mode	V I = 4.2 to 20 V, I O = 250 mA			4	6	mA
	OFF mode	V I = 6 V			50	100	μA
SVR	Supply voltage rejection	I O = 5 mA	f = 120 Hz		73		dB
SVR	Supply voltage rejection	V I = 5.2 ± 1 V	f = 1 kHz		70
SVR	Supply voltage rejection	V I = 5.2 ± 1 V	f = 10 kHz		55
eN	Output noise voltage	B = 10 Hz to 100 kHz			50		μV
V d	Dropout voltage (1)	I O = 250 mA			0.4	0.6	V
V d	Dropout voltage (1)	I O = 250 mA, T A = -40 to 125 °C				0.8	V
V IL	Control input logic low	T A = -40 to 125 °C				0.8	V
V IH	Control input logic high	T A = -40 to 125 °C		2			V
I I	Control input current	V I = 6 V, V C = 6 V			10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA		2	10		μF

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 4. L4931Cxx33 electrical characteristics

Symbol	Parameter	Test conditions		Min. Typ.		Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 5.3 V		3.234	3.3	3.366	V
V O	Output voltage	I O = 5 mA, V I = 5.3 V, T A =-25 to 85 °C		3.168		3.432	V
V I	Operating input voltage	I O = 250 mA				20	V
I out	Output current limit				300		mA
∆V O	Line regulation	V I = 4.1 to 20 V, I O = 0.5 mA			3	18	mV
∆V O	Load regulation (1)	V I = 4.3 V, I O = 0.5 to 250 mA			3	18	mV
I d	Quiescent current ON mode	V I = 4.3 to 20 V, I O = 0 mA			0.6	1	mA
I d	Quiescent current ON mode	V I = 4.3 to 20 V, I O = 250 mA			4	6	mA
I d	OFF mode	V I = 6 V			50	100	μA
SVR	Supply voltage rejection	I O = 5 mA	f = 120 Hz		73		dB

Table 4. L4931Cxx33 electrical characteristics

Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
SVR	Supply voltage rejection	V I = 5.3 ± 1 V	f = 1 kHz		70		dB
SVR	Supply voltage rejection	V I = 5.3 ± 1 V	f = 10 kHz		55		dB
eN	Output noise voltage	B = 10 Hz to 100 kHz			50		μV
V d	Dropout voltage (1)	I O = 250 mA			0.4	0.6	V
V d	Dropout voltage (1)	I O = 250 mA, T A = -40 to 125 °C				0.8	V
V IL	Control input logic low	T A = -40 to 125 °C				0.8	V
V IH	Control input logic high	T A = -40 to 125 °C		2			V
I I	Control input current	V I = 6 V, V C = 6 V			10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA		2	10		μF

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 5. L4931CD33-TRY (automotive-grade) electrical characteristics

Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 5.3V, T A = 25°C		3.234	3.3	3.366	V
V O	Output voltage	I O = 5 mA, V I = 5.3 V		3.168		3.432
V I	Operating input voltage	I O = 250 mA				20	V
Iout	Output current limit	T A = 25 °C			300		mA
∆V O	Line regulation	V I = 4.1 to 20 V, I O = 0.5 mA				20	mV
∆V O	Load regulation	V I = 4.3 V, I O = 0.5 to 250 mA				38	mV
Id	Quiescent current ON mode	V I = 4.3 to 20 V, I O = 0 mA				1	mA
Id	Quiescent current ON mode	VI =4.3 to 20 V, IO = 250 mA				11	mA
Id	OFF mode	VI= 6 V				100	μA
SVR	Supply voltage rejection	I O = 5 mA V I = 5.3 ± 1 V TA = 25 °C	f = 120 Hz		73
SVR	Supply voltage rejection	I O = 5 mA V I = 5.3 ± 1 V TA = 25 °C	f = 1 kHz		70		dB
SVR	Supply voltage rejection	I O = 5 mA V I = 5.3 ± 1 V TA = 25 °C	f = 10 kHz		55		dB
eN	Output noise voltage	B = 10 Hz to 100 kHz, TA = 25°C			50		μV
V d	Dropout voltage	I O = 250 mA, TA = 25 °C			0.4	0.6	V
V d	Dropout voltage	IO = 250 mA				0.82	V
V IL	Control input logic low					0.82	V
V IH	Controlinput logic high			2			V
I I	Control input current	V I = 6 V, V C= 6 V, TA = 25 °C			10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA,TA = 25 °C		2	10		μF

Table 6. L4931ABxx35 electrical characteristics

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 5.5 V I = 5 mA, V = 5.5 V, T =-25 to 85 °C	3.465 3.43	3.5	3.535 3.57	V
V I	Operating input voltage	I O = 250 mA			20	V

Table 6. L4931ABxx35 electrical characteristics

Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
I out	Output current limit				300		mA
∆V O	Line regulation	V I = 4.2 to 20 V, I O = 0.5 mA			3	15	mV
∆V O	Load regulation (1)	V I = 4.4 V, I O = 0.5 to 250 mA			3	15	mV
I d	Quiescent current	V I = 4.4 to 20 V, I O = 0 mA			0.6	1	mA
I d	ON mode	V I = 4.4 to 20 V, I O = 250 mA			4	6	mA
I d	OFF mode	V I = 6 V			50	100	μA
SVR	Supply voltage rejection	I O = 5 mA	f = 120 Hz		73		dB
SVR	Supply voltage rejection	V = 5.4 ± 1 V	f = 1 kHz		70		dB
SVR	Supply voltage rejection	I	f = 10 kHz		55		dB
eN	Output noise voltage	B = 10 Hz to 100 kHz			50		μV
V d	Dropout voltage (1)	I O = 250 mA			0.4	0.6	V
V d	Dropout voltage (1)	I O = 250 mA, T A = -40 to 125 °C				0.8	V
V IL	Control input logic low	T A = -40 to 125 °C				0.8	V
V IH	Control input logic high	T A = -40 to 125 °C		2			V
I I	Control input current	V I = 6 V, V C = 6 V			10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA		2	10		μF

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 7. L4931ABxx50 electrical characteristics

Symbol	Parameter	Test conditions	Test conditions	Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 7 V	I O = 5 mA, V I = 7 V	4.95	5	5.05	V
V O	Output voltage	I O = 5 mA, V I = 7 V, T A =-25 to 85 °C	I O = 5 mA, V I = 7 V, T A =-25 to 85 °C	4.9		5.1	V
V I	Operating input voltage	I O = 250 mA	I O = 250 mA			20	V
I out	Output current limit				300		mA
∆V O	Line regulation	V I = 5.8 to 20 V, I O = 0.5 mA	V I = 5.8 to 20 V, I O = 0.5 mA		3.5	17.5	mV
∆V O	Load regulation (1)	V I = 6 V, I O = 0.5 to 250 mA	V I = 6 V, I O = 0.5 to 250 mA		3	15	mV
I d	Quiescent current	V I = 6 to 20 V, I O = 0 mA	V I = 6 to 20 V, I O = 0 mA		0.6	1	mA
I d	ON mode	V I = 6 to 20 V, I O = 250 mA	V I = 6 to 20 V, I O = 250 mA		4	6	mA
I d	OFF mode	V I = 6 V	V I = 6 V		50	100	μA
SVR	Supply voltage rejection	I O = 5 mA V I = 7 ± 1 V	f = 120 Hz		70		dB
SVR	Supply voltage rejection	I O = 5 mA V I = 7 ± 1 V	f = 1 kHz		67		dB
SVR	Supply voltage rejection	I O = 5 mA V I = 7 ± 1 V	f = 10 kHz		55		dB
eN	Output noise voltage	B = 10 Hz to 100 kHz	B = 10 Hz to 100 kHz		50		μV
V d	Dropout voltage (1)	I O = 250 mA	I O = 250 mA		0.4	0.6	V
V d	Dropout voltage (1)	I O = 250 mA, T A = -40 to 125 °C	I O = 250 mA, T A = -40 to 125 °C			0.8	V
V IL	Control input logic low	T A = -40 to 125 °C	T A = -40 to 125 °C			0.8	V
V IH	Control input logic high	T A = -40 to 125 °C	T A = -40 to 125 °C	2			V

Table 7. L4931ABxx50 electrical characteristics

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
I I	Control input current	V I = 6 V, V C = 6 V		10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA	2	10		μF

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 8. L4931Cxx50 electrical characteristics

Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 7 V		4.9	5	5.1	V
V O	Output voltage	I O = 5 mA, V I = 7 V, T A =-25 to 85 °C		4.8		5.2	V
V I	Operating input voltage	I O = 250 mA				20	V
I out	Output current limit				300		mA
∆V O	Line regulation	V I = 5.8 to 20 V, I O = 0.5 mA			3.5	17.5	mV
∆V O	Load regulation (1)	V I = 6 V, I O = 0.5 to 250 mA			3	15	mV
I d	Quiescent current	V I = 6 to 20 V, I O = 0 mA			0.6	1	mA
I d	ON mode	V I = 6 to 20 V, I O = 250 mA			4	6	mA
I d	OFF mode	V I = 6 V			50	100	μA
SVR	Supply voltage rejection	I O = 5 mA	f = 120 Hz		70		dB
SVR	Supply voltage rejection	V I = 7 ± 1 V	f = 1 kHz		67		dB
SVR	Supply voltage rejection	V I = 7 ± 1 V	f = 10 kHz		55		dB
eN	Output noise voltage	B = 10 Hz to 100 kHz			50		μV
V d	Dropout voltage (1)	I O = 250 mA			0.4	0.6	V
V d	Dropout voltage (1)	I O = 250 mA, T A = -40 to 125 °C				0.8	V
V IL	Control input logic low	T A = -40 to 125 °C				0.8	V
V IH	Control input logic high	T A = -40 to 125 °C		2			V
I I	Control input current	V I = 6 V, V C = 6 V			10		μA
C O	Output bypass capacitance	ESR = 0.1 to 10 Ω, I O = 0 to 250 mA		2	10		μF

(Refer to the test circuits, T A = 25 °C, C I = 0.1 μF, C O = 2.2 μF unless otherwise specified).

Table 9. L4931ABxx120 electrical characteristics

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
V O	Output voltage	I O = 5 mA, V I = 14 V	11.88	12	12.12	V
V O	Output voltage	I O = 5 mA, V I = 14 V, T A =-25 to 85 °C	11.76		12.24	V
V I	Operating input voltage	I O = 250 mA			20	V
I out	Output current limit			300		mA
∆V O	Line regulation	V I = 12.8 to 20 V, I O = 0.5 mA		4	20	mV
∆V O	Load regulation (1)	V I = 13 V, I O = 0.5 to 250 mA		3	15	mV
I d	Quiescent current	V I = 13 to 20 V, I O = 0 mA		0.8	1.6	mA

Table 9. L4931ABxx120 electrical characteristics

L4931CD50 Absolute Maximum Ratings

Table 1. Absolute maximum ratings

Symbol	Parameter	Value	Unit
V I	DC Input voltage	20	V
I O	Output current	Internally limited	mA
P D	Power dissipation	Internally limited	mW
T STG	Storage temperature range	-40 to 150	°C
T OP	Operating junction temperature range	-40 to 125	°C

Note:

Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

Table 2. Thermal data

Symbol	Parameter	TO-92	DPAK	SO-8	Unit
R thJC	Thermal resistance junction-case		8	20	°C/W
R thJA	Thermal resistance junction-ambient	200	100	55	°C/W

Table 2. Thermal data

L4931CD50 Typical Application

Figure 3. Test circuit

AMG050320171502MT

L4931CD50 Package Information

To meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions, and product status are available at: www.st.com. ECOPACK is an ST trademark.

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
L4931ABDT33	STMicroelectronics	DPAK
L4931CD33	STMicroelectronics	SO-8
L4931CZ33	STMicroelectronics	TO-92
L4931CZ50	STMicroelectronics	—

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