TS2581
PWM Controller
1/7
Version: A11
General Description
The TS2581 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-
supply regulator. All the functions include an error amplifier, a soft-start, UVLO, OVP, SCP, TSD circuitry.
This device features an internal 100KHz oscillator, the UVLO makes sure that the outputs are off until the internal
circuit operates normally.
Features
● Input voltage：8V to 40V
● Duty ratio：0% to 100% PWM control
● Oscillation frequency：100K/300KHz
● Thermal Shutdown function.
● Short Circuit Protect (SCP).
● External SW P-channel MOS.
● External OVP setting function.
● Current mode non-synchronous PWM converter
● External current limit setting.
● Under voltage Lockout.
Ordering Information
Part No. Package Packing
TS2581CS RLG SOP-8 2.5kpcs / 13” Reel
Note: “G” denotes for Halogen Free
Application
● Simple High-efficiency Step down Regulator
● Charger
● Telecommunication
Absolute Maximum Rating
Parameter Symbol Limit Unit
VIN Pin Voltage V
IN
GND - 0.3 to GND + 45 V
VGATE,ISENSE Pin Voltage GND - 0.3 to V
IN
V
Feedback, OVP, EN/CT Pin Voltage GND - 0.3 to 6 V
Switch Pin Voltage V
SW
GND - 0.3 to V
IN
+ 0.3 V
Power Dissipation PD (T
J
– T
A
)/ θ
JA
W
Storage Temperature Range T
ST
-40 to +165 °C
Operating Temperature Range T
OP
-20 to +125 °C
Operating Supply Voltage V
OP
+8.5 to +40 V
Thermal Information
Parameter Symbol Maximum Unit
Thermal Resistance (Junction to Case) Ө
JC
15
o
C/W
Thermal Resistance (Junction to Ambient) Ө
JA
40
o
C/W
Note1: Ө
JA
is measured on the PCB with minimum copper area.
Note2: Ө
JA
is measured with the PCB copper area (need connect to GROUND pins) of approximately 0.5 in
2
1. EN/CT 8. FB
2. GND 7. OVP
3. V
6. V
4. V
5. GATE
