LT1959CS8 datasheet(2/24 Pages) LINER

2 / 24 page

LT1959

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, TJ = 25°C, VIN = 5V, VC = 1.5V, Boost = VIN + 5V, switch open, unless

otherwise noted.

ABSOLUTE MAXIMUM RATINGS

Input Voltage .......................................................... 16V

BOOST Voltage ........................................................ 30V

BOOST Pin Above Input Voltage ............................. 15V

SHDN Pin Voltage ..................................................... 7V

FB Pin Voltage ....................................................... 3.5V

FB Pin Current ....................................................... 1mA

SYNC Pin Voltage ..................................................... 7V

Operating Junction Temperature Range

LT1959C ................................................ 0

°C to 125°C

LT1959I ........................................... – 40

°C to 125°C

Storage Temperature Range ................ – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300

°C

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Feedback Voltage (Adjustable)

All Conditions

1.19

1.21

1.23

Reference Voltage Line Regulation

4.3V

≤ VIN ≤ 15V

0.01

0.03

%/ V

Feedback Input Bias Current

–0.5

0.5

µA

Error Amplifier Voltage Gain

(Note 2)

200

400

Error Amplifier Transconductance

∆I (VC) = ±10µA

1500

2000

2700

µMho

1000

3100

µMho

VC Pin to Switch Current Transconductance

5.3

A/ V

Error Amplifier Source Current

VFB = 1.05V

140

225

320

µA

Error Amplifier Sink Current

VFB = 1.35V

140

225

320

µA

VC Pin Switching Threshold

Duty Cycle = 0

0.9

VC Pin High Clamp

2.1

Switch Current Limit

VC Open, VFB = 1.05V, DC ≤ 50%

4.5

8.5

Slope Compensation

DC = 80%

0.8

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

ORDER PART

NUMBER

LT1959CR

LT1959IR

1959

1959I

S8 PART MARKING

LT1959CS8

LT1959IS8

(Note 1)

TOP VIEW

S8 PACKAGE

8-LEAD PLASTIC SO

VIN

BOOST

GND**

VSW

SYNC

SHDN

R PACKAGE

7-LEAD PLASTIC DD

FRONT VIEW

BOOST

VIN

GND

VSW

SHDN

TAB

GND

**WITH (FUSED GND) GROUND PIN

CONNECTED TO GROUND PLANE OR

LARGE LANDS

TJMAX = 150°C, θJA = 30°C/W

WITH PACKAGE SOLDERED TO 0.5 SQUARE INCH

COPPER AREA OVER BACKSIDE GROUND PLANE OR

INTERNAL POWER PLANE.

θJA CAN VARY FROM 20°C/W

TO > 40

°C/W DEPENDING ON MOUNTING TECHNIQUES

TJMAX = 150°C, θJA = 80°C/W

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