SG29125 データシートの表示（PDF） - Microsemi Corporation

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SG29125

LOW DROPOUT DUAL REGULATOR

Microsemi Corporation 

SG29125/125A

ELECTRICAL CHARACTERISTICS (continued)

Parameter

Test Conditions

Standby Output (VSB) Section

Output Voltage (Note 4)

Line Regulation

Load Regulation

Output Impedance

Quiescent Current

Output Noise Voltage

Long Term Stability

Ripple Rejection

Dropout Voltage

Current Limit

Maximum Operational Input Voltage

6V ≤ VIN ≤ 26V, IO ≤ 50mA, -40°C ≤ TA ≤ 85°C

6V ≤ VIN ≤ 26V

1mA ≤ IO ≤ 35mA

1mA ≤ IO ≤ 50mA

1mADC and 1mARMS, 100Hz - 10kHz

IO ≤ 10mA, VOUTOFF

10Hz - 100kHz

FO = 120Hz

IO ≤ 50mA

4.75V ≤ VO ≤ 6V

Note 4. The temperature extremes are guaranteed but not 100% production tested.

TYPICAL CIRCUIT WAVEFORM 60V

INPUT 14V

VOLTAGE

PIN 1 (V)

0V

33V

26V

4V

SG29125/125A

Min. Typ. Max.

Units

4.75 5.0 5.25

V

4 50

mV

10 25

mV

25 50

mV

1

Ω

1.2 3

mA

300

µVRMS

20

mV/1000hr

66

dB

0.55 0.7

V

50 100

mA

60 70

V

14V

ON/OFF 2V

SWITCH

0.8V

12V

OUTPUT 5V

VOLTAGE

PIN 2 (V)

0V

STANDBY 5V

VOLTAGE

PIN 5 (V)

SYSTEM

CONDITION

TURN

ON

LOAD

DUMP

0.8V

12V

12V

3.5V

12V

12V

0V

3.7V

5.0V

LOW VIN

LINE NOISE,

ETC.

VOUT

SHORT

CIRCUIT

THERMAL

SHUTDOWN

TURN

OFF

APPLICATION NOTES

The advantages of using a low-dropout regulator such as the

SG29125/125A are the need for less “headroom” for full regula-

tion, and the inherent reverse polarity protection provided by the

PNP output device. A typical NPN regulator design requires an

input to output differential of approximately two volts minimum.

This is due to the 2Vbe + Vcesat of the NPN Darlington used in

the output, coupled with the voltage drop across the current limit

resistor. In contrast, the “PNP Regulator” uses a single series

pass transistor with its single Vcesat, thus the lower input to

output voltage differential or dropout voltage.

In addition to a low dropout voltage, an important advantage of

the SG29125/125A series is low quiescent current in the standby

mode. When the high current or primary regulator is shut off, the

regulator enters a micropower mode. Here all but the most

essential circuitry to power the standby output is deactivated.

This allows the lowest possible quiescent current (typical around

1.2mA), a vital factor when used in a battery powered system.

In some applications the regulator output voltage is used not only

as a power supply but also as a voltage reference for control

systems. In such cases not just the temperature stability of the

output is important but also the initial accuracy. The SG29125/

125A fills this need as the internal bandgap reference is trimmed

allowing a typical output voltage tolerance of ±1%.

12/90 Rev 1.1 2/94

Copyright © 1994

LINFINITY Microelectronics Inc.

3

11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

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