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LT1932

Constant-Current DC/DC LED Driver in ThinSOT

Linear Technology 

LT1932

ABSOLUTE AXI U RATI GS

(Note 1)

VIN Voltage ............................................................. 10V

SHDN Voltage ......................................................... 10V

SW Voltage ............................................................. 36V

LED Voltage ............................................................. 36V

RSET Voltage ............................................................. 1V

Junction Temperature .......................................... 125°C

Operating Temperature Range (Note 2) .. – 40°C to 85°C

Storage Temperature Range ................. – 65°C to 150°C

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

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

SW 1

GND 2

LED 3

6 VIN

5 SHDN

4 RSET

S6 PACKAGE

6-LEAD PLASTIC SOT-23

TJMAX = 125°C, θJA = 250°C/ W

ORDER PART

NUMBER

LT1932ES6

S6 PART MARKING

LTST

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V, unless otherwise noted.

PARAMETER

Minimum Input Voltage

Quiescent Current

RSET Pin Voltage

LED Pin Voltage

LED Pin Current

LED Pin Current Temperature Coefficient

Switching Frequency

Maximum Switch Duty Cycle

Switch Current Limit

Switch VCESAT

SHDN Pin Current

Start-Up Threshold (SHDN Pin)

Shutdown Threshold (SHDN Pin)

Switch Leakage Current

CONDITIONS

VRSET = 0.2V

VSHDN = 0V

RSET = 1.50k

RSET = 1.50k, VIN < VOUT (Figure 1)

RSET = 562Ω, VIN = 1.5V

RSET = 750Ω, VIN = 1.2V

RSET = 1.50k, VIN = 1.2V

RSET = 4.53k, VIN = 1.2V

ILED = 15mA

VIN = 1V

ISW = 300mA

VSHDN = 0V

VSHDN = 2V

Switch Off, VSW = 5V

MIN TYP MAX UNITS

1

V

1.2

1.6

mA

0.1

1.0

µA

100

mV

120 180

mV

33

38

45

mA

25

30

36

mA

12.5

15

17.5

mA

5

mA

– 0.02

mA/°C

0.8

1.2

1.6

MHz

q 90

95

%

400 550 780

mA

150 200

mV

0

0.1

µA

15

30

µA

0.85

V

0.25

V

0.01

5

µA

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: The LT1932E is guaranteed to meet specifications from 0°C to 70°C.

Specifications over the – 40°C to 85°C operating temperature range are

assured by design, characterization and correlation with statistical process

controls.

1932f

2

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