LT1962EMS8 データシートの表示（PDF） - Linear Technology

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LT1962EMS8

300mA, Low Noise, Micropower LDO Regulators

Linear Technology 

LT1962 Series

TYPICAL PERFOR A CE CHARACTERISTICS

LT1962-5 10Hz to 100kHz

Output Noise (CBYP = 0)

LT1962-5 10Hz to 100kHz

Output Noise (CBYP = 100pF)

LT1962-5 10Hz to 100kHz

Output Noise (CBYP = 1000pF)

VOUT

100µV/DIV

VOUT

100µV/DIV

VOUT

100µV/DIV

COUT = 10µF

IL = 300mA

1ms/DIV

1962 G52

COUT = 10µF

IL = 300mA

1ms/DIV

1962 G53

COUT = 10µF

IL = 300mA

1ms/DIV

1962 G54

LT1962-5 10Hz to 100kHz

Output Noise (CBYP = 0.01µF)

VOUT

100µV/DIV

COUT = 10µF

IL = 300mA

1ms/DIV

1962 G55

LT1962-5 Transient Response

VIN = 6V

0.4 CIN = 10µF

0.2

COUT = 10µF

CBYP = 0

0

–0.2

–0.4

LT1962-5 Transient Response

0.10

0.05

0

–0.05

–0.10

VIN = 6V

CIN = 10µF

COUT = 10µF

CBYP = 0.01µF

300

200

100

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

TIME (ms)

1962 G56

300

200

100

0

0 50 100 150 200 250 300 350 400 450 500

TIME (µs)

1962 G57

PI FU CTIO S

OUT (Pin 1): Output. The output supplies power to the

load. A minimum output capacitor of 3.3µF is required to

prevent oscillations. Larger output capacitors will be

required for applications with large transient loads to limit

peak voltage transients. See the Applications Information

section for more information on output capacitance and

reverse output characteristics.

SENSE (Pin 2): Sense. For fixed voltage versions of the

LT1962 (LT1962-1.5/LT1962-1.8/LT1962-2.5/LT1962-3/

LT1962-3.3/LT1962-5), the SENSE pin is the input to the

error amplifier. Optimum regulation will be obtained at the

point where the SENSE pin is connected to the OUT pin of

the regulator. In critical applications, small voltage drops

are caused by the resistance (RP) of PC traces between the

regulator and the load. These may be eliminated by con-

necting the SENSE pin to the output at the load as shown

in Figure 1 (Kelvin Sense Connection). Note that the

voltage drop across the external PC traces will add to the

dropout voltage of the regulator. The SENSE pin bias

current is 10µA at the nominal rated output voltage. The

SENSE pin can be pulled below ground (as in a dual supply

system where the regulator load is returned to a negative

supply) and still allow the device to start and operate.

ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the

input to the error amplifier. This pin is internally clamped

to ±7V. It has a bias current of 30nA which flows into the

10

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