Step-Down Converter. MT1470 Datasheet

MT1470 Converter. Datasheet pdf. Equivalent

MT1470 Datasheet
Recommendation MT1470 Datasheet
Part MT1470
Description Synchronous Step-Down Converter
Feature MT1470; AEROSEMI MT1470 CASC 2A,4.5V-21V Input,500kHz Synchronous Step-Down Converter FEATURES  High E.
Manufacture Aerosemi
Datasheet
Download MT1470 Datasheet




Aerosemi MT1470
AEROSEMI
MT1470
CASC
2A,4.5V-21V Input,500kHz
Synchronous Step-Down Converter
FEATURES
High Efficiency: Up to 96%
500KHz Frequency Operation
2A Output Current
No Schottky Diode Required
4.5V to 21V Input Voltage Range
0.8V Reference
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Integrated internal compensation
Stable with Low ESR Ceramic Output
Capacitors
Over Current Protection with Hiccup-Mode
Thermal Shutdown
Inrush Current Limit and Soft Start
Available in SOT23-6 Package
-40°C to +85°C Temperature Range
GENERAL DESCRIPTION
The MT1470 is a fully integrated, high efficiency
2A synchronous rectified step-down converter.
The MT1470 operates at high efficiency over a
wide output current load range.
This device offers two operation modes, PWM
control and PFM Mode switching control, which
allows a high efficiency over the wider range of the
load.
The MT1470 requires a minimum number of
readily available standard external components
and is available in an 6-pin SOT23 ROHS
compliant package.
APPLICATIONS
Distributed Power Systems
Digital Set Top Boxes
Flat Panel Television and Monitors
Wireless and DSL Modems
Notebook Computer
TYPICAL APPLICATION
VIN
CIN
22μF
C2
1uF
BS
VIN
SW
MT1470
EN
FB
GND
L
10μH
R1
100k
1%
R2
19k
1%
Figure 1. Basic Application Circuit
VOUT
C1
22pF
opt.
COUT
22μF*2
MT2492 Rev1.0
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Aerosemi MT1470
AEROSEMI
MT1470 2A ,500kHz Synchronous Step-Down Converter
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage……….………-0.3V to 22V
EN Voltages…………………………-0.3V to 6V
FB Voltages…………………………-0.3V to 6V
SW Voltage………………...-0.3V to (VIN+0.5V)
BS Voltage……………..(VSW-0.3V) to (VSW+5V)
Power Dissipation………………………...0.6W
Thermal Resistance θJC……………….130°C/W
Thermal Resistance θJA……………….170°C/W
Junction Temperature(Note2)………..........150°C
Operating Temperature Range…….-40°C to 85°C
Lead Temperature(Soldering,10s)………...300°C
Storage Temperature Range……..-65°C to 150°C
ESD HBM(Human Body Mode)……………...2kV
ESD MM(Machine Mode)………………….200V
PACKAGE/ORDER INFORMATION
Order Part Number
TOP VIEW
GND 1
SW 2
VIN 3
6 BS
5 EN
4 FB
6-LEAD PLASTIC SOT-23
TJMAX = 150°C, θJA = 170°C/ W, θJC = 130°C/W
MT1470
Package
SOT23-6
Top Marking
ASTFDC
TF:version, D:year, C:week
PIN DESCRIPTION
Pin Name Pin Number
Description
GND
1
Analog ground pin.
SW
2
Switching Pin.
VIN
3
Power supply Pin
FB
4
Adjustable version feedback input. Connect FB to the center point of the
external resistor divider
Drive this pin to a logic-high to enable the IC. Drive to a logic-low to
EN
5
disable the IC and enter micro-power shutdown mode. For automatic
start-up, connect EN to VIN using a 200kΩ resistor.
BS
6
Bootstrap. A capacitor connected between SW and BS pins is required
to form a floating supply across the high-side switch driver.
MT2492 Rev1.0
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Aerosemi MT1470
AEROSEMI
MT1470 2A ,500kHz Synchronous Step-Down Converter
ELECTRICAL CHARACTERISTICS (Note 3)
(VIN=12V, VOUT=5V, TA = 25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
Input Voltage Range
Supply Current in
Operation
VEN=3.0V, VFB=2V
Supply Current in
Shutdown
VEN =0 or EN = GND
Regulated Feedback
Voltage
TA = 25°C, 4.5VVIN 20V
High-Side Switch
On-Resistance
Low-Side Switch
On-Resistance
High-Side Switch
Leakage Current
VEN=0V, VSW=0V
Low-Side Switch
Leakage Current
VEN=0V, VSW=12V
Upper Switch Current
Limit
Minimum Duty Cycle
OVP
Oscillation Frequency
Maximum Duty Cycle VFB=0.7V
Minimum On-Time
Soft-start Time
Tss
Thermal Shutdown
MIN
4.5
0.776
400
TYP
0.6
1
0.800
90
70
4.5
22
500
92
60
2
180
MAX UNIT
21
V
0.8
mA
µA
0.824
V
mΩ
mΩ
1
µA
1
µA
A
V
580
KHz
%
nS
mS
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the
following formula: TJ = TA + (PD) x (170°C/W).
Note 3: 100% production test at +25°C. Specifications over the temperature range are guaranteed by
design and characterization.
MT2492 Rev1.0
www.aerosemi.com
Aerosemi Proprietary Information.Unauthorized Photocopy and Duplication Prohibited.
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All Rights Reserved.







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