TS1935B Datasheet, PDF (1/6 Pages) Taiwan Semiconductor Company, Ltd – 1.9A / 1.2MHz Boost DC to Dc Converter

Preliminary
TS1935B
1.9A / 1.2MHz Boost DC to Dc Converter
SOT-25
Pin Definition:
1. SW
2. Ground
3. FB
4. EN
5. Input
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
TS1935BCX5 RFG SOT-25
Note: “G” denotes for Halogen Free
Packing
3Kpcs / 7” Reel
Absolute Maximum Rating
Parameter
Symbol
Limit
Input Voltage
EN, V_FB Voltage
V_IN
V_EN, V_FB
GND - 0.3 to GND + 6.5
GND - 0.3 to V_CC + 0.3
SW Voltage
V_SW
30
Ambient Temperature Range
T_A
-40 to +85
Junction Temperature Range
T_J
-40 to +125
Storage Temperature Range
T_STG
-40 to +150
Note: Stress above the listed absolute maximum rating may cause permanent damage to the device
Thermal Information
Parameter
Symbol
Maximum
Thermal Resistance* (Junction to Case)
Ó¨_JC
110
Thermal Resistance* (Junction to Ambient)
Internal Power Dissipation
Ó¨_JA
250
P_D
(T_J-T_A)/Ó¨_JA
Maximum Junction Temperature
Tj
150
Lead Solder Temperature (260^oC)
5
Note: Ó¨_JA is measured with the PCB copper area of approximately 1 in2(Multi-layer).
Unit
V
V
V
o_C
o_C
o_C
Unit
o_C/W
o_C/W
mW
o_C
S
1/6
Version: Preliminary