Techcode®
DATASHEET
40V, 3A Asynchronous Step-Down Converter
General Description
Features
The TD1457 is a current mode monolithic buck switching
regulator. Operating with an input range of 4.5‐40V, the
TD1457 delivers 3A of continuous output current with an
integrated high side N‐Channel MOSFET. At light loads,
TD1457 operates in low frequency to maintain high efficiency
and low output voltage ripple. Current mode control provides
tight load transient response and cycle‐by‐cycle current
limiting.
The TD1457 guarantees robustness with input under‐voltage
lockout, start‐up current run‐away protection, output short
protection, feedback short protection and thermal
protection.
The TD1457 is available in 8‐pin ESOP package.
Pin Configurations
TD1457
4.5V to 40V operating input range
3A output current
Up to 94% efficiency
High efficiency (>78%) at light load
Internal Soft‐Start
Adjustable switch frequency
from 100kHz to 900kHz
Input under‐voltage lockout
Start‐up current run‐away protection
Output short protection
Feedback short protection
Thermal protection
Available in ESOP8 package
Application
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
(Top view)
April 19, 2019. Techcode Semiconductor Limited www.techcodesemi.com
1
Techcode®
DATASHEET
40V, 3A Asynchronous Step-Down Converter
TD1457
Pin Description
Pin Number
Pin Name
Description
1
SW
SW is the switching node that supplies power to the output. Connect the output LC filter from
SW to the output load.
2
EN
Drive EN pin high to turn on the regulator and low to turn off the regulator.
Compensation pin. Comp is used to compensate the regulation control loop. Connect a series
RC network from COMP to GND to compensate the regulation control loop. One ceramic cap
such as several tens pF is usually connected from COMP to GND to decouple the voltage noise.
3
COMP
4
FB
5
GND
6
RT
Voltage at the RT pin is regulated at 1.2V. Switch frequency of the regulator can be adjusted by
connecting a resistor at the RT pin to ground
7
VIN
Input voltage pin. VIN supplies power to the IC. Connect a 3.8V to 40V supply to VIN and bypass
VIN to GND with a suitably large capacitor to eliminate noise on the input pin to the IC.
8
BST
Bootstrap pin for top switch. A 0.1uF or larger capacitor should be connected between this pin
and SW pin to supply current to the top switch and top switch driver.
Output feedback pin. FB senses the output voltage and is regulated by the control loop to FB
reference voltage 0.8V. Connect a resistive divider at FB.
Ground.
Ordering Information
TD1457
□
□
Circuit Type Packing:
Blank:Tube
Package
R: Tape and Reel
M:ESOP-8
April 19, 2019. Techcode Semiconductor Limited www.techcodesemi.com
2
Techcode®
DATASHEET
40V, 3A Asynchronous Step-Down Converter
TD1457
Function Block
Figure1 Function Block Diagram of TD1457
Typical Application Circuit
Figure2 Vin: 8V~36V Vout: 5V Iout: 0~3A(RT=330KΩ)
Figure3 Vin: 8V~36V Vout: 5V Iout: 0~3A(RT=68KΩ)
April 19, 2019. Techcode Semiconductor Limited www.techcodesemi.com
3
Techcode®
DATASHEET
40V, 3A Asynchronous Step-Down Converter
TD1457
Absolute Maximum Ratings (at TA=25℃)
Symbol
Parameter
Rating
Unit
VIN,EN,SW Pin
‐0.3 to 45
V
BST Pin
SW‐0.3 to SW+5
All other Pins
‐0.3 to 6
V
TJ
Junction Temperature
150
ºC
TSTG
Storage Temperature
TSDR
ºC
‐65 ~ 150
Maximum Lead Soldering Temperature (10 Seconds)
ºC
260
Electrical Characteristics
Unless otherwise specified, these specifications apply over VIN=12V, TA=25°C
Characteristics
Symbol
Conditions
Min
Typ
Max
Units
VIN Under‐voltage Lockout
Threshold
VIN_MIN
VIN falling
3.6
3.8
4
V
VIN Under‐voltage Lockout
Hysteresis
VIN_MIN_HYST
VIN rising
200
400
600
mV
Shutdown Supply Current
ISD
VEN=0V
‐
1.6
3
μA
Supply Current
IQ
VEN=5V, VFB=1V
30
65
90
μA
Feedback Voltage
VFB
3.6V
很抱歉,暂时无法提供与“TD1457”相匹配的价格&库存,您可以联系我们找货
免费人工找货