LT1935ES5#TRMPBF Linear Technology, LT1935ES5#TRMPBF Datasheet - Page 6

IC MULTI CONFIG ADJ 2A TSOT23-5

LT1935ES5#TRMPBF

Manufacturer Part Number
LT1935ES5#TRMPBF
Description
IC MULTI CONFIG ADJ 2A TSOT23-5
Manufacturer
Linear Technology
Type
Step-Up (Boost), Flyback, Sepicr
Datasheet

Specifications of LT1935ES5#TRMPBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.27 ~ 38 V
Current - Output
2A
Frequency - Switching
1.2MHz
Voltage - Input
2.3 ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-5, TSOT-5, TSOP-5
Primary Input Voltage
16V
No. Of Outputs
1
Output Voltage
38V
Output Current
2A
No. Of Pins
5
Operating Temperature Range
-40°C To +85°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Dc To Dc Converter Type
Step Up
Pin Count
5
Input Voltage
16V
Switching Freq
1400KHz
Package Type
TSOT-23
Output Type
Adjustable
Switching Regulator
Yes
Line Regulation
0.01%/V
Mounting
Surface Mount
Input Voltage (min)
2.3V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
LT1935ES5#PBF
LT1935ES5#PBF
LT1935ES5#TRMPBF
LT1935ES5#TRMPBFTR

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APPLICATIONS
Figure 5. Transient Response with a 68pF Phase-Lead Capacitor
LT1935
6
100mV/DIV
200mA/DIV
I LOAD
V OUT
V
OUT
Figure 7. Suggested Layout
5V/DIV
2V/DIV
1A/DIV
V OUT
GND
RUN
U
I IN
+
FB
D1
C2
INFORMATION
R2
84.5k
10k
U
RUN
50µs/DIV
R1
L1
68pF
Reduces the Peak Input Current During Start-Up. V
Figure 6. Adding a Resistor and Capacitor to the SHDN Pin
SHDN
W
20µs/DIV
C3
GND
C1
20µF
OUT
V
OUT
1935 F05
= 5V, C2 = 20µF, Output Load = 10Ω.
U
V
SHDN
IN
1935 F06a
1935 F03
Soft Start
The SHDN pin can be used to soft start the LT1935,
reducing the maximum input current during start up. The
SHDN pin is driven through an external RC filter to create
a ramp at this pin. Figure 6 shows the start-up waveforms
with and without the soft start circuit. Without soft start,
the input current peaks at ~3A. With soft start, the peak
current is reduced to 1A. By choosing a large RC time
constant, the peak start-up current can be reduced to the
current that is required to regulate the output, with no
overshoot. Choose the value of the resistor so that it can
supply 100µA when the SHDN pin reaches 1.8V.
Layout Hints
The high speed operation of the LT1935 demands careful
attention to board layout. You will not get advertised
performance with careless layout. Figure 7 shows the
recommended component placement. Make the ground
pin copper area large. This helps to lower the die
temperature.
5V/DIV
2V/DIV
1A/DIV
V OUT
RUN
I IN
RUN
0.22µF
10k
IN
= 3.3V,
SHDN
200µs/DIV
GND
1935 F06b
1935f

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