LP38855 datasheet(4/20 Pages) TI

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LP38855

SNVS461D – OCTOBER 2006 – REVISED APRIL 2013

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Electrical Characteristics (continued)

Unless otherwise specified: VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1µF, VEN = VBIAS.

Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +125°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

ENABLE Pin

VEN = VBIAS

0.01

IEN

ENABLE pin Current

µA

-19

-40

VEN = 0.0V, VBIAS = 5.5V

-30

-13

-51

1.00

1.50

VEN(ON)

Enable Voltage Threshold

VEN rising until Output = ON

1.25

0.90

1.55

VEN falling from VEN(ON) until

150

VEN(HYS)

Enable Voltage Hysteresis

100

Output = OFF

200

tOFF

Turn-OFF Delay Time

RLOAD × COUT << tOFF

µs

tON

Turn-ON Delay Time

RLOAD × COUT << tON

AC Parameters

VIN = VOUT +1V, f = 120 Hz

PSRR

Ripple Rejection for VIN Input

(VIN)

Voltage

VIN = VOUT + 1V, f = 1 kHz

VBIAS = VOUT + 3V, f = 120 Hz

PSRR

Ripple Rejection for VBIAS Voltage

(VBIAS)

VBIAS = VOUT + 3V, f = 1 kHz

Output Noise Density

f = 120 Hz

µV/

√Hz

BW = 10 Hz

− 100 kHz

150

Output Noise Voltage

µVRMS

BW = 300 Hz

− 300 kHz

Thermal Parameters

TSD

Thermal Shutdown Junction

160

Temperature

°C

TSD(HYS)

Thermal Shutdown Hysteresis

TO-220-5

Thermal Resistance, Junction to

θJA

Ambient(4)

DDPAK/TO-263-5

°C/W

TO-220-5

Thermal Resistance, Junction to

θJC

Case(4)

DDPAK/TO-263-5

(4)

Device power dissipation must be de-rated based on device power dissipation (TD), ambient temperature (TA), and package junction to

ambient thermal resistance (

θJA). Additional heat-sinking may be required to ensure that the device junction temperature (TJ) does not

exceed the maximum operating rating. See the Application Information section for details.

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