TS3552
2A/350kHz Synchronous Buck DC/DC Converter
2/11
Version: B11
Absolute Maximum Rating
Characteristics Symbol
Rating Unit
Maximum Supply Voltage V
IN
-0.3 ~ +24 V
Switching Pin Input Voltage V
SW
-1 ~ (V
IN
+0.3) V
Boost Voltage V
BS
(V
SW
-0.3) ~ (V
SW
+6) V
All Other Pins -0.3 to +6
V
Output Voltage V
OUT
0.925 ~ 20
V
Power Dissipation P
D
Internal Limited
W
Operating Temperature Range T
OPR
-40 to +85
ºC
Storage Temperature Range T
ST
-65 to +150
ºC
Operating Junction Temperature Range T
J
+150
ºC
Thermal Resistance Junction to case
θ
JC
40
ºC/W
Thermal Resistance Junction to ambient θ
JA
120
ºC/W
Note: Stresses exceed those rating may damage the device
Note: θ
JA
is measured with the PCB copper area of approximately 1 in
2
(multi-layer)
Electrical Specifications
(T
A
=25
o
C, V
IN
=12V unless otherwise noted)
Parameter
Symbol Conditions Min
Typ
Max
Unit
Operating Voltage V
IN
4.75
-- 23 V
Shutdown Supply Current I
SD
V
EN
=0V -- 1 3 µA
Feedback Voltage V
FB
4.75V ≤ V
IN
≤ 23V 0.9 0.925
0.95
V
Load Regulation REG
LOAD
-2 -- +2 %
High-Side MOSFET On-Resistance R
DSON
-- 130
-- mΩ
Low-Side MOSFET On-Resistance R
DSON
-- 130
-- mΩ
High-Side MOSFET Leakage Current I
L(HIGH-SIDE)
V
EN
= 0V, V
SW
= 0V
-- -- 10 µA
High-Side MOSFET Current Limit I
LIMIT
Minimum Duty 2.4 3.4 -- A
Oscillator Frequency F
OSC
280
350
430
KHz
Short Circuit Oscillator Frequency F
SC
V
FB
=0V -- 90 -- KHz
Maximum Duty Cycle DC V
FB
=0.8V -- 90 -- %
Soft-Start Current I
SS
V
SS
=0V -- 6 -- µA
Soft-Start Period C
SS
=0.1µF -- 15 -- mS
EN Shutdown Threshold Voltage V
ENSD
V
EN
Rising 1.1 1.5 2.0 V
Thermal Shutdown OTP -- 160
-- °C
Thermal Shutdown Hysteresis OTP
HYSTERSIS
-- 35 -- °C
Note 1: Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C operat ing
temperature range are assured by design, characterization and correlation with Statistical Quality Controls
(SQC).
Note 2: It is recommended to use duty ratio above 10% for minimizing resultant duty cycle jitter.
Note 3: It is recommended to connect a soft start capacitor to soft start pin. Leave the soft start pin open may
cause large inrush current and output overshooting
