Datasheet

2
LT1935
1935f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Voltage Measured at the FB Pin ● 1.240 1.265 1.280 V
Feedback Voltage Line Regulation 2.5V ≤ V
IN
≤ 16V 0.01 %/V
FB Pin Bias Current V
FB
= V
REF
● 12 60 nA
Undervoltage Lockout Threshold 2.1 2.3 V
Maximum Input Voltage 16 V
Switching Frequency 1 1.2 1.4 MHz
Maximum Duty Cycle ● 85 93 %
Switch Current Limit (Note 3) 2 3.2 A
Switch Saturating Voltage I
SW
= 2A 180 280 mV
Switch Leakage Current V
SW
= 5V ● 0.01 1 µA
SHDN Pin Input Current V
SHDN
= 1.8V 14 40 µA
V
SHDN
= 0V 0.1 µA
Operating Supply Current V
FB
= 1.5V 3 mA
SHDN Supply Current V
SHDN
= 0V 0.1 1 µA
SHDN Input High Voltage 1.8 V
SHDN Input Low Voltage 0.5 V
(Note 1)
V
IN
Voltage .............................................................. 16V
SW Voltage ................................................–0.4V to 40V
FB Voltage ................................................................. 6V
Current Into FB Pin .............................................. ±1mA
SHDN Voltage ......................................................... 16V
Maximum Junction Temperature ......................... 125°C
Operating Ambient Temperature Range
(Note 2) .............................................. – 40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Strict adherence to JDEC 020B solder attach and rework
for assemblies containing lead is recommended.
Consult LTC marketing for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3V, V
SHDN
= V
IN
unless otherwise noted. (Note 2)
ORDER PART
NUMBER
LT1935ES5
S5 PART MARKING
LTRX
T
JMAX
= 125°C, θ
JA
= 113°C/ W,
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER I FOR ATIO
UU
W
ABSOLUTE AXI U RATI GS
WWWU
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1935ES5 is guaranteed to meet performance 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.
Note 3: Current limit guaranteed by design and/or correlation to static test.
SW 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
FB 3
5 V
IN
4 SHDN