LP78084 datasheet(4/20 Pages) POWER

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Preliminary Datasheet

LP78084

LP78084 – 02 Ver. 1.1 Datasheet

Nov.-2007

Page 4 of 22

Absolute Maximum Ratings

Input Voltage to GND (VINA, VINB) ---------------------------------------------------------------------------- 6V

Adapter Voltage to GND (VADP) ----------------------------------------------------------------------0.3V to 6V

LX to GND (VLX) ----------------------------------------------------------------------------- 0.3V to VIN +0.3V

FB to GND (VFB) ------------------------------------------------------------------------------ 0.3V to VIN +0.3V

ENA, ENB, EN_BAT to GND (VEN) ----------------------------------------------------------------0.3V to 6V

BAT, ISET, STAT (VX) ----------------------------------------------------------------------0.3V to VADP+0.3V

Operating Junction Temperature Range (TJ) ----------------------------------------------------40℃ to 150℃

Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 260℃

Thermal Information

Maximum Power Dissipation (PD) --------------------------------------------------------------------------- 2W

Thermal Resistance (JA) ------------------------------------------------------------------------------------50℃/W

Electrical Characteristics

(VINA

=VOUT(NOM) + 1V for

VOUT

options greater than 1 .5V. IOUT = 1mA, COUT = 2.2µF, CIN = 1µF, TA = -40℃ to 85℃ ,

unless otherwise noted. Typical values are TA=25℃ )

LP78084

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Step-Down Converter

VIN

Input Voltage

2.6

5.5

VINB Rising

2.6

Hysteresis

200

VUVLO

UVLO Threshold

VINB Falling

2.4

VOUT

Output Voltage Tolerance

IOUTB = 0 to 250mA,

VINB = 2.6V to 5.5V

-3

VOUT

Output Voltage Range

0.6

VINB

Quiescent Current

No Load

µA

ISHDN

Shutdown Current

ENB = GND

µA

ILIM

P-Channel Current Limit

RDS(ON)H

High-Side Switch On Resistance

0.26

RDS(ON)L

Low-Side Switch On Resistance

0.28

ILXLEAK

LX Leakage Current

VINB = 5.5V, VLX = 0 to VINB

µA

∆VLine-reg/∆VIN

Line Regulation

VINB = 2.8V to 5.5V

0.2

0.4

%/V

VFB

Feedback Threshold Voltage

Accuracy

VINB = 3.6V

0.588

0.6

0.612

IFB

FB Leakage Current

VOUTB = 1 .0V

0.2

µA

FOSC

Oscillator Frequency

1.2

1.5

1.8

MHz

Startup Time

From Enable to Output Regulation

120

µs

TSD

Over-Temperature Shutdown

Threshold

150

℃

THYS

Over-Temperature Shutdown

Hysteresis

℃

VEN(L)

Enable Threshold Low

0.4

VEN(H)

Enable Threshold High

1.4

IEN

Input Low Current

VINB = VENB = 5.5V

-1

µA

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