TMI and SUNTO are the brands of TOLL microelectronic www.toll-semi.com
TMI3252SHF V1.0 – 2020.02 1
TMI3252SHF
1MHz, 18V, 2A FPWM Synchronous COT Step-Down Converter
Features
⚫ 140mΩ/70mΩ Low R
DS(ON)
internal FETs
⚫ Force PWM 1MHz Operation
⚫ Wide Input Range: 4.5V to 18V
⚫ 0.6V Reference
⚫ 1MHz Switch Frequency
⚫ Up to 2A Output Current
⚫ COT control to achieve fast transient
responses
⚫ 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 TMI3252SHF is a high efficiency 1MHz,
Constant on-Time (COT) control mode synchronous
step-down DC-DC converter capable of delivering
up to 2A current with force PWM operation.
TMI3252SHF 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 TMI3252SHF 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
IN
EN
GND
LX
FB
R1
R2
22µF
22µF
L
C
bst
BS
100nF
R
bst
CIN1 CIN2
CO1
100kΩ
R3
C
fb
0.1µF
0Ω~10Ω
2.2µH
40.2kΩ
33pF
V
OUT
=3.3V
8.87kΩ
Efficiency
V
OUT
=3.3V, I
OUT
=0.01A to 2A, T
A
=25°C
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 0.5 1 1.5 2
Efficiency
Output Current (A)
9V-3.3V
12V-3.3V
16V-3.3V
2 TMI3252SHF V1.0 – 2020.02
www.toll-semi.com TMI and SUNTO are the brands of TOLL microelectronic
TMI3252SHF
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)
160
°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: TPHXXX
TPH: Device Code
XXX: Inside Code
Order Information
Part Number
Package
Top Marking
Quantity/Reel
TMI3252SHF
SOT23-6
TPHXXX
3000
TMI3252SHF devices are Pb-free and RoHS compliant.