LP38798 datasheet(4/23 Pages) TI

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LP38798

SNOSCT6A – MARCH 2013 – REVISED MAY 2013

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ELECTRICAL CHARACTERISTICS

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

range of –40°C to +125°C. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for

reference purposes only. Minimum and Maximum limits are specified through test, design, or statistical correlation. Unless

otherwise stated the following conditions apply: VIN = 5.5 V, VSET = 5.0 V, CCP= 10 nF X7R, CIN = 10 μF 50 mΩ Tantalum,

COUT = 10 μF X7R MLCC, IOUT = 10 mA, and TJ = 25°C.

Symbol

Parameter

Conditions

Min

Typical

Max

Units

1.188

1.212

VFB

Feedback Voltage

1.2

5.5 V

≤ VIN ≤ 20.0 V

1.176

1.224

VOS

VOUT – VSET

3.5

16.0

IFB

Feedback Pin Current

VFB = 1.2 V

µA

VIN = 3.0 V, VSET = 2.5 V

SET Pin Internal Current

ISET

VIN = 5.5 V, VSET = 5.0 V

25.2

67.8

μA

Sink

VIN = 12.5 V, VSET = 12.0 V

5.5 V

≤ VIN ≤ 20.0 V

ΔVOUT / ΔVIN Line Regulation

(1)

0.005

%/V

IOUT = 10 mA

ΔVOUT /

VIN = 5.5 V

Load Regulation(2)

-0.2

%/A

ΔIOUT

10 mA

≤ IOUT ≤ 800 mA

VDO

Dropout Voltage(3)

IOUT = 800 mA

200

420

UVLO

Undervoltage Lock-Out

VIN Rising until output is on

2.47

2.65

2.83

VIN Falling from > UVLO threshold until

ΔUVLO

UVLO Hysteresis

180

output is off

IOUT = 800 mA

1.4

2.25

IGND

Ground Pin Current(4)

VIN = 20.0 V, IOUT = 800 mA

1.6

2.51

IOUT = 0 mA

1.4

2.1

Ground Pin Current,

Quiescent(4)

VIN = 20.0 V, IOUT = 0 mA

1.5

2.2

VEN = 0.0 V

Ground Pin Current,

ISD

µA

Shutdown(4)

VIN = 20.0 V, VEN = 0.0 V

ISC

Short Circuit Current

RLOAD = 0Ω

850

1200

1600

2.8

ΔVCP

VCP – VIN

VIN = 20.0V

2.3

From VEN > VEN(ON) to VOUT ≥ 98% of

tSTART

Start-up Time

155

300

µs

VOUT(NOM)

VOUT = 1.2 V, f = 10 kHz

110

VOUT = 5.0 V, f = 10 kHz

VOUT = 1.2 V, f = 100 kHz

Power Supply Rejection

PSRR

Ratio

VOUT = 5.0 V, f = 100 kHz

VOUT = 1.2 V, f = 1 MHz

VOUT = 5.0 V, f = 1 MHz

(1)

Line Regulation: % change in VOUT(NOM) for every 1V change in VIN= (( ΔVOUT / VOUT(NOM)) / ΔVIN ) x 100%

(2)

Load Regulation: % change in VOUT(NOM) for every 1A change in IOUT = (( ΔVOUT / VOUT(NOM) ) / ΔIOUT ) x 100%

(3)

Dropout voltage (VDO) is defined as the differential voltage measured between VOUT and VIN when VIN, falling from VIN = VOUT + 1V,

causes VOUT to drop 2% below the value measured with VIN = VOUT + 1V. Dropout voltage specification does not apply when the

programmed output voltage is below the Minimum Operating Input Voltage.

(4)

Ground pin current is the sum of the current in both GND pins (Pin 4 + Pin 5) only, and does not include current from the SET pin.

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