TS1935B
1.9A / 1.2MHz Boost DC to Dc Converter
1/8
Version: B13
General Description
The TS1935B is a current mode step up converter intended for small, low power applications. The converter input
voltage ranging from 2.6V to 5.5V. The Output voltage can be set up to 27V. The frequency is 1.2MHz allows the
use of small external inductors and capacitors and provides fast transient response. Internal soft start results in
small inrush current and extends battery life. Internal power MOSFET with very low RDS (ON) provides high
efficiency. The TS1935B automatically transits from PWM to PFM during light load condition further increasing
efficiency. The converter also provides protection functions such as under-voltage lockout, current limit and
thermal shutdown.
Features
● 2.6V to 5.5 V operating input voltage range
● Adjustable output voltage range up to 27V
● 1.2MHz Fixed Switching Frequency
● Internal soft-start function
● Current limit and Thermal shutdown protection
● Under voltage Lockout
● ≤ 1µA Shutdown Current
Application
● White LED Current Source
● Digital Still Cameras
● Portable Electronics
● PDA’s and Palm-Top Computers
● Local Boost Regulator
Ordering Information
Part No. Package
Packing
TS1935BCX5 RFG SOT-25 3Kpcs / 7” Reel
Note: “G” denotes for Halogen Free
Absolute Maximum Rating
Parameter Symbol Limit Unit
Input Voltage V
IN
GND - 0.3 to GND + 6.5
V
EN, V
FB
Voltage V
EN
, V
FB
GND - 0.3 to V
CC
+ 0.3
V
SW Voltage V
SW
30 V
Ambient Temperature Range T
A
-40 to +85
o
C
Junction Temperature Range T
J
-40 to +125
o
C
Storage Temperature Range T
STG
-40 to +150
o
C
Note: Stress above the listed absolute maximum rating may cause permanent damage to the device
Thermal Information
Parameter Symbol Maximum Unit
Thermal Resistance* (Junction to Case)
Ө
JC
110
o
C/W
Thermal Resistance* (Junction to Ambient) Ө
JA
250
o
C/W
Internal Power Dissipation P
D
(T
J
-T
A
)/Ө
JA
mW
Maximum Junction Temperature
Tj 150
o
C
Lead Solder Temperature (260
o
C)
5 S
Note: Ө
JA
is measured with the PCB copper area of approximately 1 in2(Multi-layer).
1. SW
2. Ground
3. FB
4. EN
