LT1937
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
Input Voltage (VIN) ................................................. 10V
SW Voltage ............................................................. 36V
FB Voltage .............................................................. 10V
SHDN Voltage ......................................................... 10V
Extended Commercial
Operating Temperature Range (Note 2)... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
TOP VIEW
SW 1
GND 2
FB 3
5 V
IN
LT1937ES5
LT1937ESC6
SW 1
GND 2
FB 3
6 V
IN
5 GND
4 SHDN
4 SHDN
S5 PACKAGE
S5 PART MARKING
LTYN
SC6 PART MARKING
LAAB
SC6 PACKAGE
5-LEAD PLASTIC TSOT-23
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 256°C/ W IN FREE AIR
θJA = 120°C ON BOARD OVER GROUND PLANE
TJMAX = 125°C, θJA = 256°C/ W IN FREE AIR
θJA = 150°C ON BOARD OVER GROUND PLANE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TA = 25°C, VIN = 3V, VSHDN = 3V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
2.5
10
V
I
= 100mA, Duty Cycle = 66%
86
10
95
45
104
100
mV
nA
SW
FB Pin Bias Current
Supply Current
1.9
0.1
2.5
1.0
mA
µA
SHDN = 0V
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
0.8
85
1.2
90
1.6
MHz
%
320
350
0.01
mA
mV
µA
V
Switch V
I
= 250mA
= 5V
CESAT
SW
Switch Leakage Current
SHDN Voltage High
SHDN Voltage Low
V
5
SW
1.5
0.4
V
SHDN Pin Bias Current
65
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1937E 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.
1937f
2
Linear [ Linear ]
