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Linear Technology Electronic Components Datasheet

LT1935 Datasheet

DC/DC Converter

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LT1935
1.2MHz Boost DC/DC
Converter in ThinSOT
with 2A Switch
FEATURES
1.2MHz Switching Frequency
High Output Voltage: Up to 38V
Wide Input Range: 2.3V to 16V
Low VCESAT Switch: 180mV at 2A
Soft-Start
Uses Small Surface Mount Components
5V at 1A from 3.3V Input
12V at 600mA from 5V Input
Low Shutdown Current: < 1µA
Pin-for-Pin Compatible with the LT1613 and LT1930
Low Profile (1mm) SOT-23 (ThinSOTTM) Package
U
APPLICATIO S
Digital Cameras
Battery Backup
LCD Bias
Local 5V or 12V Supply
PC Cards
xDSL Power Supply
TFT-LCD Bias Supply
DESCRIPTIO
The LT®1935 is the industry’s highest power SOT-23
switching regulator. Its unprecedented 2A, 40V internal
switch allows high output currents to be generated in a
small footprint. Intended for space-conscious applica-
tions, the LT1935 switches at 1.2MHz, allowing the use of
tiny, low profile inductors and capacitors 2mm or less in
height. The NPN switch achieves a VCESAT of just 180mV
at 2A independent of supply voltage, resulting in high
efficiency even at maximum power levels from a 3V input.
A constant frequency, internally compensated, current
mode PWM architecture results in low, predictable output
noise that is easy to filter. Low ESR ceramic capacitors can
be used on the output, further reducing noise to the
millivolt level. The high voltage switch on the LT1935 is
rated at 40V, making the device ideal for boost converters
up to 38V as well as for single-ended primary inductance
converter (SEPIC) and flyback designs. The device can
generate 5V at up to 1A from a 3.3V supply or 5V at 550mA
from four alkaline cells in a SEPIC design.
The LT1935 is available in a 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
L1
VIN
4.2µH
D1
5V
4.7µF
ON OFF
VIN SW
LT1935
SHDN
FB
GND
84.5k
10k
VOUT
12V
600mA
10µF
D1: ON SEMI MBRM120
L1: SUMIDA CDRH5D28-4R2
1935 F01
Figure 1. 5V to 12V, 600mA Step-Up DC/DC Converter
www.DataSheet4U.com
Efficiency, VOUT = 12V
90
85 VIN = 5V
80 VIN = 3.3V
75
70
65
60
55
50
0 100 200 300 400 500 600 700
LOAD CURRENT (mA)
1935 F01b
1935f
1


Linear Technology Electronic Components Datasheet

LT1935 Datasheet

DC/DC Converter

No Preview Available !

LT1935
ABSOLUTE AXI U RATI GS
(Note 1)
VIN 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.
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
GND 2
FB 3
5 VIN
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 113°C/ W,
ORDER PART
NUMBER
LT1935ES5
S5 PART MARKING
LTRX
Consult LTC marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3V, VSHDN = VIN unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
Feedback Voltage
Measured at the FB Pin
1.240 1.265 1.280
Feedback Voltage Line Regulation
FB Pin Bias Current
Undervoltage Lockout Threshold
2.5V VIN 16V
VFB = VREF
0.01
12 60
2.1 2.3
Maximum Input Voltage
16
Switching Frequency
1 1.2 1.4
Maximum Duty Cycle
85
93
Switch Current Limit
(Note 3)
2 3.2
Switch Saturating Voltage
Switch Leakage Current
SHDN Pin Input Current
Operating Supply Current
SHDN Supply Current
SHDN Input High Voltage
ISW = 2A
VSW = 5V
VSHDN = 1.8V
VSHDN = 0V
VFB = 1.5V
VSHDN = 0V
180 280
0.01 1
14 40
0.1
3
0.1 1
1.8
SHDN Input Low Voltage
0.5
UNITS
V
%/V
nA
V
V
MHz
%
A
mV
µA
µA
µA
mA
µA
V
V
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.
1935f
2


Part Number LT1935
Description DC/DC Converter
Maker Linear Technology
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LT1935 Datasheet PDF






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