Datasheet
2
LT1932
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage 1V
Quiescent Current V
RSET
= 0.2V 1.2 1.6 mA
V
SHDN
= 0V 0.1 1.0 µA
R
SET
Pin Voltage R
SET
= 1.50k 100 mV
LED Pin Voltage R
SET
= 1.50k, V
IN
< V
OUT
(Figure 1) 120 180 mV
LED Pin Current R
SET
= 562Ω, V
IN
= 1.5V 34 38 42 mA
R
SET
= 750Ω, V
IN
= 1.2V 26 30 34 mA
R
SET
= 1.50k, V
IN
= 1.2V 12.5 15 17.5 mA
R
SET
= 4.53k, V
IN
= 1.2V 5 mA
LED Pin Current Temperature Coefficient I
LED
= 15mA –0.02 mA/°C
Switching Frequency V
IN
= 1V 0.8 1.2 1.6 MHz
Maximum Switch Duty Cycle ● 90 95 %
Switch Current Limit 400 550 780 mA
Switch V
CESAT
I
SW
= 300mA 150 200 mV
SHDN Pin Current V
SHDN
= 0V 0 0.1 µA
V
SHDN
= 2V 15 30 µA
Start-Up Threshold (SHDN Pin) 0.85 V
Shutdown Threshold (SHDN Pin) 0.25 V
Switch Leakage Current Switch Off, V
SW
= 5V 0.01 5 µA
(Note 1)
V
IN
Voltage ............................................................. 10V
SHDN Voltage ......................................................... 10V
SW Voltage ............................................................. 36V
LED Voltage ............................................................. 36V
R
SET
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
ORDER PART
NUMBER
LT1932ES6
T
JMAX
= 125°C, θ
JA
= 250°C/ W
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
SHDN
= 1.2V, unless otherwise noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
S6 PART MARKING
LTST
SW 1
GND 2
LED 3
6 V
IN
5 SHDN
4 R
SET
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
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.
Consult LTC Marketing for parts specified with wider operating temperature
ranges.