MOTOROLA LP2950, LP2951 Technical data

LP2950/D

Order this document by LP2950/D

LP2950

LP2951

Micropower

Voltage

Regulators

MICROPOWER

The LP2950 and LP2951 are micropower voltage regulators that are

LOW DROPOUT

specifically designed to maintain proper regulation with an extremely low

VOLTAGE REGULATORS

input±to±output voltage differential. These devices feature a very low

quiescent bias current of 75 μA and are capable of supplying output currents

in excess of 100 mA. Internal current and thermal limiting protection is

provided.

The LP2951 has three additional features. The first is the Error Output

Z SUFFIX

that can be used to signal external circuitry of an out of regulation condition,

PLASTIC PACKAGE

or as a microprocessor power±on reset. The second feature allows the

CASE 29

(TO±226AA/TO±92)

output voltage to be preset to 5.0 V, 3.3 V or 3.0 V output (depending on the

1

Pin: 1. Output

version) or programmed from 1.25 V to 29 V. It consists of a pinned out

2

3

2. Ground

resistor divider along with direct access to the Error Amplifier feedback input.

3. Input

The third feature is a Shutdown input that allows a logic level signal to

turn±off or turn±on the regulator output.

Due to the

low input±to±output

voltage

differential

and bias current

DT SUFFIX

PLASTIC PACKAGE

1

specifications,

these

devices

are

ideally

suited

for

battery powered

CASE 369A

computer, consumer, and industrial equipment where an extension of

(DPAK)

3

useful battery life is desirable. The LP2950 is available in the three pin case

29 and DPAK packages, and the LP2951 is available in the eight pin

dual±in±line, SO±8 and Micro±8 surface mount packages. The `A' suffix

Pin:

1.

Input

devices feature an initial output voltage tolerance ± 0.5%.

1

2

3

2.

Ground

3.

Output

LP2950 and LP2951 Features:

• Low Quiescent Bias Current of 75 μA

(Top View)

• Low Input±to±Output Voltage Differential of 50 mV at 100 μA and

Heatsink surface (shown as terminal 4 in

380 mV at 100 mA

case outline drawing) is connected to Pin 2.

• 5.0 V, 3.3 V or 3.0 V ± 0.5% Allows Use as a Regulator or Reference

• Extremely Tight Line and Load Regulation

D SUFFIX

•

μ

PLASTIC PACKAGE

8

Requires Only a 1.0

F Output Capacitor for Stability

CASE 751

1

(SO±8)

• Internal Current and Thermal Limiting

LP2951 Additional Features:

N SUFFIX

• Error Output Signals an Out of Regulation Condition

PLASTIC PACKAGE

• Output Programmable from 1.25 V to 29 V

CASE 626

8

1

• Logic Level Shutdown Input

DM SUFFIX

8

PLASTIC PACKAGE

CASE 846A

1

(Micro±8)

Output

1

8

Input

Sense

2

7

Feedback

Shutdown

3

6

VO Tap

Gnd

4

5

Error Output

(See Following Page for Ordering Information.)

(Top View)

Motorola, Inc. 1996

Rev 4

		LP2950 LP2951
	ORDERING INFORMATION
		Operating
Device	Type	Temperature Range	Package
LP2950CZ±**			TO±92/TO±226AA
LP2950ACZ±**	Fixed Voltage
LP2950CDT±**	(3.0, 3.3 or 5.0 V)		DPAK
LP2950ACDT±**
LP2951CD	Adjustable or
LP2951ACD	5.0 V Fixed		SO±8
LP2951CD±**	Adjustable or Fixed
LP2951ACD±**	(3.0, 3.3 V)	TJ = ±40° to +125°C
LP2951CN	Adjustable or
LP2951ACN	5.0 V Fixed		Plastic
LP2951CN±**	Adjustable or Fixed
LP2951ACN±**	(3.0, 3.3 V)
LP2951CDM	Adjustable or
LP2951ACDM	5.0 V Fixed		Micro±8
LP2951CDM±**	Adjustable or Fixed
LP2951ACDM±**	(3.0, 3.3 V)

** = Voltage option of 3.0, 3.3 or 5.0 V.

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

	Device No. (±1%)	Device No. (±0.5%)	Nominal Voltage
	LP2950CX±5.0	LP2950ACX±5.0		5.0
	LP2950CX±3.3	LP2950ACX±3.3		3.3
	LP2950CX±3.0	LP2950ACX±3.0		3.0
	LP2951CX	LP2951ACX	Adjustable or 5.0
	LP2950CX±3.3	LP2951ACX±3.3	Adjustable or 3.3
	LP2951CX±3.0	LP2951ACX±3.0	Adjustable or 3.0
	X = Package suffix.
		Representative Block Diagrams
		Input		Output		5.0 V/100 mA
		3		1
					1.0 μF
		Battery or		182 k
	Unregulated DC
		Error Amplifier		60 k
			1.23 V
			Reference	LP2950CZ±5.0
		Gnd	2
		Input 8	Output 1	Sense 2		5.0 V/100 mA
	Battery or				1.0	μF
	Unregulated DC			182 k
					VO Tap
				60 k	6
					7	330 k

	Error
Shutdown	Amplifier

From

3 60 k

CMOS/TTL	50 k

1.23 V

Reference

Gnd 4

Feedback

75 mV/

60 mV Error Output

To CMOS/TTL 5

Error Detection

Comparator

LP2951CD or CN

This device contains 34 active transistors.

2	MOTOROLA ANALOG IC DEVICE DATA

LP2950 LP2951

MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating	Symbol		Value			Unit
Input Voltage	VCC	30				Vdc
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation	PD	Internally Limited				W
Case 751(SO±8) D Suffix
Thermal Resistance, Junction±to±Ambient	RθJA	180				°C/W
Thermal Resistance, Junction±to±Case	RθJC	45				°C/W
Case 369A (DPAK) DT Suffix [Note 1]
Thermal Resistance, Junction±to±Ambient	RθJA	92				°C/W
Thermal Resistance, Junction±to±Case	RθJC	6.0				°C/W
Case 29 (TO±226AA/TO±92) Z Suffix
Thermal Resistance, Junction±to±Ambient	RθJA	160				°C/W
Thermal Resistance, Junction±to±Case	RθJC	83				°C/W
Case 626 N Suffix
Thermal Resistance, Junction±to±Ambient	RθJA	105				°C/W
Case 846A (Micro±8) DM Suffix
Thermal Resistance, Junction±to±Ambient	RθJA	240				°C/W
Feedback Input Voltage	Vfb		±1.5 to +30			Vdc
Shutdown Input Voltage	Vsd		±0.3 to +30			Vdc
Error Comparator Output Voltage	Verr		±0.3 to +30			Vdc
Operating Junction Temperature	TJ		±40 to +125			°C
Storage Temperature Range	Tstg		±65 to +150			°C
NOTE: 1. The Junction±to±Ambient Thermal Resistance is determined by PC board copper area
per Figure 26.
2. ESD data available upon request.
ELECTRICAL CHARACTERISTICS (Vin = VO + 1.0 V, IO = 100 μA, CO = 1.0 μF, TJ = 25°C [Note 1], unless otherwise
noted.)
Characteristic			Symbol			Min		Typ	Max	Unit
Output Voltage, 5.0 V Versions			VO							V
Vin = 6.0 V, IO = 100 μA, TJ = 25°C
LP2950C±5.0/LP2951C						4.950		5.000	5.050
LP2950AC±5.0/LP2951AC						4.975		5.000	5.025
TJ = ± 40 to +125°C
LP2950C±5.0/LP2951C						4.900		±	5.100
LP2950AC±5.0/LP2951AC						4.940		±	5.060
Vin = 6.0 to 30 V, IO = 100 μA to 100 mA, TJ = ± 40 to +125°C
LP2950C±5.0/LP2951C						4.880		±	5.120
LP2950AC±5.0/LP2951AC						4.925		±	5.075
Output Voltage, 3.3 V Versions			VO							V
Vin = 4.3 V, IO = 100 μA, TJ = 25°C
LP2950C±3.3/LP2951C±3.3						3.267		3.300	3.333
LP2950AC±3.3/LP2951AC±3.3						3.284		3.300	3.317
TJ = ± 40 to +125°C
LP2950C±3.3/LP2951C±3.3						3.234		±	3.366
LP2950AC±3.3/LP2951AC±3.3						3.260		±	3.340
Vin = 4.3 to 30 V, IO = 100 μA to 100 mA, TJ = ± 40 to +125°C
LP2950C±3.3/LP2951C±3.3						3.221		±	3.379
LP2950AC±3.3/LP2951AC±3.3						3.254		±	3.346
Output Voltage, 3.0 V Versions			VO							V
Vin = 4.0 V, IO = 100 μA, TJ = 25°C
LP2950C±3.0/LP2951C±3.0						2.970		3.000	3.030
LP2950AC±3.0/LP2951AC±3.0						2.985		3.000	3.015
TJ = ± 40 to +125°C
LP2950C±3.0/LP2951C±3.0						2.940		±	3.060
LP2950AC±3.0/LP2951AC±3.0						2.964		±	3.036
Vin = 4.0 to 30 V, IO = 100 μA to 100 mA, TJ = ± 40 to +125°C
LP2950C±3.0/LP2951C±3.0						2.928		±	3.072
LP2950AC±3.0/LP2951AC±3.0						2.958		±	3.042

MOTOROLA ANALOG IC DEVICE DATA	3

LP2950 LP2951

ELECTRICAL CHARACTERISTICS (continued) (Vin = VO + 1.0 V, IO = 100 μA, CO = 1.0 μF, TJ = 25°C [Note 1], unless otherwise noted.)

Characteristic	Symbol	Min	Typ	Max	Unit
Line Regulation (Vin = VO(nom) +1.0 V to 30 V) [Note 2]	Regline				%
LP2950C±XX/LP2951C/LP2951C±XX		±	0.08	0.20
LP2950AC±XX/LP2951AC/LP2951AC±XX		±	0.04	0.10
Load Regulation (IO = 100 μA to 100 mA)	Regload				%
LP2950C±XX/LP2951C/LP2951C±XX		±	0.13	0.20
LP2950AC±XX/LP2951AC/LP2951AC±XX		±	0.05	0.10
Dropout Voltage	VI ± VO				mV
IO = 100 μA		±	30	80
IO = 100 mA		±	350	450
Supply Bias Current	ICC
IO = 100 μA		±	93	120	μA
IO = 100 mA		±	4.0	12	mA
Dropout Supply Bias Current (Vin = VO(nom) ± 0.5 V,	ICCdropout	±	110	170	μA
IO = 100 μA) [Note 2]
Current Limit (VO Shorted to Ground)	ILimit	±	220	300	mA
Thermal Regulation	Regthermal	±	0.05	0.20	%/W
Output Noise Voltage (10 Hz to 100 kHz) [Note 3]	Vn				μVrms
CL = 1.0 μF		±	126	±
CL = 100 μF		±	56	±
LP2951A/LP2951AC ONLY
Reference Voltage (TJ = 25°C)	Vref				V
LP2951C/LP2951C±XX		1.210	1.235	1.260
LP2951AC/LP2951AC±XX		1.220	1.235	1.250
Reference Voltage (TJ = ± 40 to +125°C)	Vref				V
LP2951C/LP2951C±XX		1.200	±	1.270
LP2951AC/LP2951AC±XX		1.200	±	1.260
Reference Voltage (TJ = ± 40 to +125°C)	Vref				V
IO = 100 μA to 100 mA, Vin = 23 to 30 V
LP2951C/LP2951C±XX		1.185	±	1.285
LP2951AC/LP2951AC±XX		1.190	±	1.270
Feedback Pin Bias Current	IFB	±	15	40	nA
ERROR COMPARATOR
Output Leakage Current (VOH = 30 V)	Ilkg	±	0.01	1.0	μA
Output Low Voltage (Vin = 4.5 V, IOL = 400 μA)	VOL	±	150	250	mV
Upper Threshold Voltage (Vin = 6.0 V)	Vthu	40	45	±	mV
Lower Threshold Voltage (Vin = 6.0 V)	Vthl	±	60	95	mV
Hysteresis (Vin = 6.0 V)	Vhy	±	15	±	mV
SHUTDOWN INPUT
Input Logic Voltage	Vshtdn				V
Logic ª0º (Regulator ªOnº)		0	±	0.7
Logic ª1º (Regulator ªOffº)		2.0	±	30
Shutdown Pin Input Current	Ishtdn				μA
Vshtdn = 2.4 V		±	35	50
Vshtdn = 30 V		±	450	600
Regulator Output Current in Shutdown Mode	Ioff	±	3.0	10	μA
(Vin = 30 V, Vshtdn = 2.0 V, VO = 0, Pin 6 Connected to Pin 7)

NOTES: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2. VO(nom) is the part number voltage option.

3. Noise tests on the LP2951 are made with a 0.01 μF capacitor connected across Pins 7 and 1.

4	MOTOROLA ANALOG IC DEVICE DATA

LP2950 LP2951

DEFINITIONS

Dropout Voltage ± The input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements.

Line Regulation ± The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected.

Load Regulation ± The change in output voltage for a change in load current at constant chip temperature.

Maximum Power Dissipation ± The maximum total device dissipation for which the regulator will operate within specifications.

Bias Current ± Current which is used to operate the regulator chip and is not delivered to the load.

Output Noise Voltage ± The rms ac voltage at the output, with constant load and no input ripple, measured over a specified frequency range.

Leakage Current ± Current drawn through a bipolar transistor collector±base junction, under a specified collector voltage, when the transistor is ªoffº.

Upper Threshold Voltage ± Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic ª0º to ª1º.

Lower Threshold Voltage ± Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic ª1º to ª0º.

Hysteresis ± The difference between Lower Threshold voltage and Upper Threshold voltage.

LP2950/LP2951 BIAS CURRENT (mA)

BIAS CURRENT (μA)

10

1.0

0.1

0.01

0.1

250

200

150

100

50

0

0

Figure 1. Quiescent Current

Figure 2. Dropout Characteristics

			6.0
				LP2951C
		(V)	5.0	TA = 25°C
						RL = 50 k
		VOLTAGE	3.0
			4.0
		OUTPUT,	2.0			RL = 50 Ω
		out	1.0
		V
1.0	10	100	0	1.0	2.0	3.0	4.0	5.0	6.0
			0
IL, LOAD CURRENT (mA)					Vin, INPUT VOLTAGE (V)

Figure 3. Input Current

Figure 4. Output Voltage versus Temperature

					5.00
		0.1 mA Load Current		(V)	4.99
				VOLTAGE
					4.98
				OUTPUT
		No Load			4.97
				,
				out	4.96
				V					LP2951C
5.0	10	15	20	25	4.95	0	50	100	150
					± 50
	Vin, INPUT VOLTAGE (V)						TA, AMBIENT TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA	5