LD3980 datasheet(6/16 Pages) STMICROELECTRONICS

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Electrical characteristics

LD3980

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Electrical characteristics

Note:

For VO(NOM) < 1.2V, VI=1.7V

Dropout voltage is the input-to-output voltage difference at which the output voltage is

100mV below its nominal value. This specification does not apply for output voltages below

1.7V.

Turn-on time is time measured between the enable input just exceeding VSHDN High Value

and the output voltage just reaching 95% of its nominal value

Typical thermal protection hysteresis is 15°C.

Table 4.

Electrical characteristics (TJ = 25°C, VI = VO(NOM) +0.5V, CI = CO = 1µF, IO = 1mA,

VSHDN = VI, unless otherwise specified) (Note: 1)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Operating input voltage

1.7

3.6

VO Accuracy

IO = 300mA

-1.0

+1.0

TJ = -40° to 85°C

-2.0

+2.0

∆VO

Line regulation

VI = VO + 0.5V to 3.6V, IO = 1mA

-0.15

0.01

+0.15

%/V

∆VO

Load regulation

IO = 1mA to 300mA

0.2

0.3

%/mA

VDROP

Dropout voltage (

Note 2)

IO = 300mA, VO ≥ 1.8V

TJ = -40° to 85°C

130

150

Output noise voltage

10Hz to 100KHz, IO = 10mA,

110.7

µVRMS/VO

SVR

Supply voltage rejection

(

Figure 7.)

VI = VO(NOM)+0.5V±VRIPPLE

VRIPPLE = 0.1V, f = 1KHz, IO = 10mA

VIN = VO(NOM)+0.5V±VRIPPLE

VRIPPLE = 0.1V, f=10KHz, IO = 10mA

Quiescent current

ON MODE: VSHDN=1.4V

IO=0mA

µA

IO=0mA, TJ = -40° to 85°C

110

IO=0 to 300mA

105

IO=0 to 300mA, TJ = -40° to 85°C

130

Quiescent current

OFF MODE: VSHDN=GND

VI input current

0.15

0.5

ISC

Short circuit current

RL=0

650

IO(PK)

Peak output current

VO ≥ VO(NOM) -5%

610

VSHDN

Shutdown input logic low

VI = 1.6V to 3.6V TJ = -40° to 85°C

0.4

Shutdown input logic high

1.4

ISHDN

Shutdown input current

VSHDN=GND or VI

0.1

100

TON

Turn on time

Note 3

120

µs

TSHDN

Thermal shutdown

Note 4

140

°C

Output capacitor

Capacitance

µF

ESR

5000

Ω

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