LP2950 datasheet(5/17 Pages) MICREL

5 / 17 page

Micrel, Inc.

LP2950/2951

September 2008

M9999-091208

Parameter

Condition

Min

Typ

Max

Units

LP295x-02 (±0.5%)

Low

High

2.0

1.3

0.7

LP295x-03 (±1%)

Low

High

2.0

1.3

0.7

Input Logic Voltage

LP2951-4.8 (±1%)

Low

High

2.0

1.3

0.7

VSHUTDOWN = 2.4V

100

µA

Shutdown Input Current

VSHUTDOWN = 30V

450

600

700

µA

Regulator Output Current

in Shutdown

Note 11

µA

Notes:

1. Boldface limits apply at temperature extremes.

2. Unless otherwise specified all limits guaranteed for TJ = 25°C, VIN = 6V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are

Feedback tied to 5V Tap and Output tied to Output Sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V.

3. Guaranteed and 100% production tested.

4. Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.

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.

6. Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at

6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT /VREF =(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.

7. VREF ≤ VOUT ≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 30V, 100µA < IL ≤ 100mA, TJ ≤ TJMAX.

8. The junction-to-ambient thermal resistance of the TO-92 package is 180°C/W with 0.4” leads and 160°C/W with 0.25” leads to a PC board. The

thermal resistance of the 8-pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal

resistance for the SOIC (M) package is 160°C/W.

9. May exceed input supply voltage.

10. When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped

to ground.

11. VSHUTDOWN ≥ 2V, VIN ≤ 30 V, VOUT = 0, with Feedback pin tied to 5V Tap.

12. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.

13. Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line

regulation effects. Specifications are for a 50mA load pulse at VIN = 30V (1.25W pulse) for t = 10ms.

14. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating

effects are covered in the specification for thermal regulation.

15. Line regulation for the LP2951 is tested at 150°C for IL = 1mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See

Typical Performance Characteristics for line regulation versus temperature and load current.

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