TMI and SUNTO are the brands of TOLL microelectronic www.toll-semi.com www.suntosemi.com
TMI3252SH Rev. 1.0 – 2019.10 1
TMI3252SH
1MHz 18V 2A Synchronous COT Step-Down Converter
Features
⚫ 140mΩ/70mΩ Low R
DS(ON)
internal FETs
⚫ High Efficiency Synchronous-Mode
Operation
⚫ Wide Input Range: 4.5V to 18V
⚫ Output Voltage from 0.6V
⚫ 1MHz Switch Frequency
⚫ Up to 2A Output Current
⚫ COT control to achieve fast transient
responses
⚫ Power Save Mode at Light Load
⚫ Integrated internal compensation
⚫ Stable with Low ESR Ceramic Output
Capacitors
⚫ Over Current Protection with Hiccup Mode
⚫ Thermal Shutdown
⚫ Inrush Current Limit and Soft Start
⚫ Build in Input Over Voltage Protection
⚫ Available in SOT23-6 Package
Description
The TMI3252SH is a high efficiency 1MHz,
Constant-on-Time (COT) control mode
synchronous step-down DC-DC converter capable
of delivering up to 2A current. TMI3252SH
integrates main switch and synchronous switch
with very low R
DS(ON)
to minimize the conduction
loss. Low output voltage ripple and small external
inductor and capacitor size are achieved with
1MHz switching frequency. It adopts the COT
architecture to achieve fast transient responses for
high voltage step down applications.
The TMI3252SH requires a minimum number of
readily available standard external components
and is available in a 6-pin SOT23-6 ROHS
compliant package.
Application
⚫ Digital Set Top Boxes
⚫ Flat Panel Television and Monitors
⚫ Notebook computer
⚫ Wireless and DSL Modems
Typical Application
VIN
EN
GND
LX
FB
VOUT= 3.3V
R1
R2
22µF
22µF
L
BS
100nF
CIN1 CIN2
CO1
100kΩ
R3
C
fb
2.2µH
39kΩ
8.66kΩ
20pF~
100pF
C4
0.1µF
Efficiency
V
OUT
=3.3V, T
A
=25°C
30%
40%
50%
60%
70%
80%
90%
100%
0.001 0.01 0.1 1 10
Efficiency
Output Current (A)
VIN=9V
VIN=12V
VIN=16V
2 TMI3252SH Rev.1.0 – 2019.10
www.toll-semi.com www.suntosemi.com TMI and SUNTO are the brands of TOLL microelectronic
TMI3252SH
Absolute Maximum Ratings
(Note 1)
Parameter
Min
Max
Unit
Input Supply Voltage, EN
-0.3
20
V
LX Voltages
-0.3
20
V
FB Voltage
-0.3
6
V
BS Voltage
-0.3
23
V
Storage Temperature Range
-65
150
°C
Junction Temperature
(Note2)
150
°C
Power Dissipation
1000
mW
Lead Temperature (Soldering, 10s)
260
°C
Package
BS
GND
EN
LX
FB
1
2
3
6
4
5
IN
SOT23-6
Top Marking: TSHXXX
TSH: Device Code
XXX: Inside Code
Order Information
Part Number
Package
Top Marking
Quantity/Reel
TMI3252SH
SOT23-6
TSHXXX
3000
TMI3252SH devices are Pb-free and RoHS compliant.