LP2951-2.85 [FCI]

100mA Low Drop Out Voltage Regulators Portable consumer equipment; 百毫安低压差稳压器便携式消费类设备


型号：	LP2951-2.85
厂家：	FIRST COMPONENTS INTERNATIONAL
描述：	100mA Low Drop Out Voltage Regulators Portable consumer equipment 百毫安低压差稳压器便携式消费类设备稳压器便携式
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LP2950/LP2951 100mA Low Drop Out Voltage Regulators

FEATURES

APPLICATIONS

High accuracy output voltage

Guaranteed 100mA output

Very low quiescent current

Low dropout voltage

Extremely tight load and line regulation

Very low temperature coefficient

Needs only 1mF for stability

Error Flag warns of output dropout

Logic-Controlled electronic shutdown

Output programmable from 1.24 to 29V

Battery powered systems

Cordless telephones

Radio control systems

Portable/Palm top/Notebook computers

Portable consumer equipment

Portable Instrumentation

Avionics

Automotive Electronics

SMPS Post-Regulator

Voltage Reference

PRODUCT DESCRIPTION

The LP2950-XX/LP2951-XX is a low power voltage regulator. This device excellent choice for use in battery powered application such as c

ordless telephone, radio control systems, and portable computers.

The LP2950-XX/LP2951-XX features very low quiescent current (75mA Typ.) and very low drop output voltage (Typ.

40mV at light load and 380mV at 100mA). This includes a tight initial tolerance of 0.5% typ., extremely good load

and line regulation of 0.05% typ., and very low output temperature coefficient, making the LP2950-XX/LP2951-XX

useful as a low-power voltage reference.

The error flag output feature is used as power-on reset for warn of a low output voltage, due to following batteries on input. Other feature i

s the logic-compatible shutdown input which enable the regulator to be switched on and off.

The LP2951-XX is available in 8-pin plastic packages. The regulator output voltage may be pin-strapped for a -XX volt or programmed from

1.24 volt to 29 volts with external pair of resistors.

The LP2950-XX is offered in 3-pin TO-92 package compatible with other fixed regulator.

Absolute Maximum Ratings

Power Dissipation

Internally Limited

Pin Connection

LP2951-XX

Lead Temperature

(Soldering, 5 seconds)

260°C

Storage Temperature Range

Operating Junction Temperature Range

Input Supply Voltage

-65°C to+150°C

-55°C to +150°C

-0.3 to +30V

Feedback Input Voltage

-1.5 to +30V

Shutdown Input Voltage

-0.3 to +30V

Top View

TO-92 Plastic Package

(LP2950-XX only)

Error Comparator Output

-0.3 to +30V

Device Selection Guide

Vout, V

olts

Device

2.85*

3.0

3.3

LP2950-2.85, LP2951-2.85

LP2950-3.0, LP2951-3.0

LP2950-3.3, LP2951-3.3

LP2950-5.0, LP2951-5.0

Bottom View

5.0

* - other versions are also available

Vout = 2.0V to 5.0V. Please consult factory for

more information

Figure 1. Adjustable Regulator

LP2950/LP2951 100mA Low Drop Out Voltage Regulators

ELECTRICALCHARACTERISTICS(atT _a=25 ^oC,V =15V;unlessotherwisenoted)

Parameter

Conditions (Note 2)

Min

Typ

Max

Units

Output Voltage

0.985 |V₀|

0.98 |V₀|

V₀

1.015 |V₀|

1.02 |V₀|

-25°C£T_J£85°C

Full Operating Temperature

100mA £ I_L£ 100mA, T_J£T_JMAX

(Note 1)

Output Voltage

0.976|V₀|

V₀

1.024 |V₀|

150

Output Voltage Temperature Coefficient

Line Regulation (Note 3)

ppm/°C

0.04

0.1

0.4

V₀+ 1V £ V_in£ 30V (Note 4)

100mA £ I_L£ 100mA

Load Regulation (Note 3)

0.3

Dropout Voltage (Note 5)

380

450

120

I_L=100 mA

Ground Current

I_L=100 mA

Dropout Ground Current

Current Limit

110

160

170

200

0.2

V_in=V₀- 0.5V, I_L=100 mA

Vout=0

Thermal Regulation

0.05

%/W

Output Noise, 10Hz to 100KHz

430

160

100

C_L=1mF

C_L=200mF

C_L=3.3mF

mV rms

(Bypass=0.01 mF pins 7 to 1

(LP2951-XX))

8-pin Versions only

Reference Voltage

1.21

1.235

1.26

1.285

Reference Voltage

Over Temperature (Note 6)

(Note 7)

1.185

Feedback Pin Bias Current

Reference Voltage Temperature Coefficient

Feedback Pin Bias Current Temperature Coefficient

Error Comparator

ppm/°C

0.1

nA/°C

Output Leakage Current

Voh=30V

0.01

1.0

Output Low Voltage

Upper Threshold Voltage

Lower Threshold Voltage

Hysteresis

150

250

Vin=4.5V, I_OL=400 mA

(Note 8)

Shutdown Input

Input Logic Voltage

Low (Regulator ON)

High (Regulator OFF)

V_S=2.4V

1.3

0.7

Shut down Pin Input Current

Regulator Output Current in Shutdown

V_S=30V

450

600

(Note 9)

V_OUT= 5.0 V

3.3V £ V_OUT< 5.0 V

2.0V £ V_OUT< 3.3 V

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 2: Unless otherwise specified all limits guaranteed for T_J= 25°C, Vin = V₀+ 1V, I_L= 100mA and C_L= 1mF. Additional conditions for the

8-pin versions are feedback tied to -XX V tap and output tied to output Sense (V_out= XX V) and V_shutdown£ 0.8 V

Note 3: Regulations is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specification for thermal regulation.

Note 4: Line regulation for LP2951-XX is tested at 150°C for I_L= 1mA. For I_L= 100mA and T_J= 125°C, line regulation is guaranteed by design to

0.2%. See typical performance characteristics for line regulation versus temperature and load current.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured

at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be

taken into account.

Note 6: Vref £ Vout £ (Vin - 1V), 2.3V £ Vin £ 30V, 100mA £ I_L£ 100mA, T_J£ T_JMAX

Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range

Note 8: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage

measured at V₀+ 1V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V_out/V_ref= (R1 +

R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV x 5V/

1.235V=384mV. Thresholds remain constant as a percent of Vout as Vout is varied , with the dropout warning occurring at typically 5% below

nominal, 7.5% guaranteed.

Note 9: V_shutdown³ 2V, Vin £ 30V, Vout = 0, Feed-back pin tied to -XX V Tap.

LP2950/LP2951 100mA Low Drop Out Voltage Regulators

Block Diagram and Typical Applications

LP2950-XX

LP2951-XX

PAD LOCATION LP2951-XX

(For LP2950-XX fixed versions see Note 1)

Chip Size: 2.05 x 1.15 mm

Pad N

Pad Name

X (mm)

440

810

1250

1865

935

Y (mm)

110

950

Output

Sense

Shutdown

Ground

Error

XX V tap

Feedback

Input

735

440

Note 1: For LP2950-XX: 8 - connected to Input

1,2 - connected to Output

- connected to GND

LP2951-2.85 [FCI]

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