3

FN7120.2

August 10, 2007

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are

Thermal Information

LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V

Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C

Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C

Operating Junction Temperature: . . . . . . . . . . . . . . . . . . . . . +135°C

Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and

result in failures not covered by warranty.

Electrical Specifications

PARAMETER

DESCRIPTION

CONDITIONS

MIN

(Note 1)

TYP

MAX

(Note 1)

UNIT

Input Voltage Range

1.8

13.2

V

Output Voltage Range

4.5

17

V

IQ1

Quiescent Current - Shut-down

1

µA

IQ2

Quiescent Current

1.4

2

mA

Feedback Voltage

1.29

1.33

1.37

V

IB

Feedback Input Bias Current

0.10

µA

Maximum Duty Cycle

84

90

%

Current Limit - Max Peak Input

Current

11.4

A

Shut-down Input Bias Current

1µA

LBI Threshold Voltage

180

220

250

mV

LBO Output Low

0.1

0.2

V

LBO Output Leakage Current

0.02

2

µA

Switch On Resistance

at 12V output

220

m

Ω

Switch Leakage Current

1µA

0.4

%/V

Load Regulation

1

%

Maximum Switching Frequency

1200

kHz

Switching Frequency

600

670

750

kHz

VHI_EN

EN Input High Threshold

1.6

V

VLO_EN

EN Input Low Threshold

0.5

V

Pin Descriptions

PIN NUMBER

PIN NAME

PIN FUNCTION

1

PGND

Power ground; connected to the source of internal N-Channel power MOSFET

2

SGND

Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND

3

RT

Timing resistor to adjust the oscillation frequency of the converter

4

EN

Chip enable; connects to logic HI (>1.6V) for chip to function

5

LBI

Low battery input; connects to a sensing voltage, or left open if function is not used

6

LBO

Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current

7

SS

Soft-start; connects to a capacitor to control the start-up of the converter

8

FB

9

VDD

Control circuit positive supply

10

LX

Inductor drive pin; connected to the drain of internal N-Channel power MOSFET

EL7515