Step-Down Converter. MT3430 Datasheet

MT3430 Converter. Datasheet pdf. Equivalent

MT3430 Datasheet
Recommendation MT3430 Datasheet
Part MT3430
Description Synchronous Step-Down Converter
Feature MT3430; AEROSEMI MT3430 CASC 3A,2.3V-6V Input,1.5MHz Synchronous Step-Down Converter FEATURES  High Ef.
Manufacture Aerosemi
Datasheet
Download MT3430 Datasheet




Aerosemi MT3430
AEROSEMI
MT3430
CASC
3A,2.3V-6V Input,1.5MHz
Synchronous Step-Down Converter
FEATURES
High Efficiency: Up to 95%
1.5MHz Constant Frequency Operation
3A Output Current
No Schottky Diode Required
2.3V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
PFM Mode for High Efficiency in Light Load
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
100% Duty Cycle in Dropout Operation
Low Quiescent Current: 40μA
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1μA Shutdown Current
ESOP8 package
APPLICATIONS
Wireless and DSL Modems
Computer Peripherals
Network Cards
Set-Top Boxes
Portable Instruments
GENERAL DESCRIPTION
The MT3430 is a constant frequency, current mode
step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency without an external Schottky diode. It is
ideal for powering portable equipment that runs
from a single cell Lithium-Ion (Li+) battery. The
MT3430 can supply up to 3A output load current
from a 2.3V to 6V input voltage and the output
voltage can be regulated as low as 0.6V. The
MT3430 can also run at 100% duty cycle for low
dropout operation, extending battery life in portable
systems while light load operation provides very
low output ripple for noise sensitive applications.
The internal slope compensation setting allows the
device to operate with smaller inductor values to
optimize size and provide efficient operation. The
MT3430 is available in adjustable (0.6V to VIN)
output voltage.
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.
TYPICAL APPLICATION
VIN
CIN
22μF
VIN
SW
MT3430
EN
FB
GND
L 2.2μH
R1
200k
1%
R2
100k
1%
C1
22pF
opt.
VOUT
COUT
22μF
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0
500
1000
1500
2000
2500
3000
3500
Figure 1. Basic Application Circuit
MT3430 Rev1.0
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Aerosemi MT3430
AEROSEMI
MT3430 3A ,1.5MHz Synchronous Step-Down Converter
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage………………-0.3V to 6.5V
EN,FB Voltages……………..-0.3V to (VIN+0.3V)
SW Voltage………………..-0.3V to (VIN+0.3V)
Power Dissipation……………………….....2W
Thermal Resistance θJC…………………10°C/W
Thermal Resistance θJA…………………50°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
TOP VIEW
Order Part Number
NC 1
8 NC
VIN 2
9
7 EN
SW 3
EP
6 NC
GND 4
5 FB
MT3430
8-LEAD PLASTIC SOP WITH EXPOSED PAD ON BACKSIDE
TJMAX = 150°C, θJA = 50°C/ W, θJC = 10°C/W
Package
ESOP8
Top Marking
3430
PIN DESCRIPTION
Pin Name Pin Number
Description
NC
1,6,8 No Connect.
VIN
2
Power Supply Input. Must be closely decoupled to GND with a 22µF or
greater ceramic capacitor.
Power Switch Output. It is the switch node connection to Inductor. This
SW
3
pin connects to the drains of the internal P-ch and N-ch MOSFET
switches.
GND
4
Ground pin.
FB
5
Output Voltage Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal reference voltage.
EN
7
Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN
below 0.4V to turn it off. Do not leave EN floating.
EP
9
Power Ground exposed pad, Must be connected to bare copper ground
plane.
MT3430 Rev1.0
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Aerosemi MT3430
AEROSEMI
MT3430 3A ,1.5MHz Synchronous Step-Down Converter
ELECTRICAL CHARACTERISTICS (Note 3)
(VIN=VEN=3.6V, VOUT=1.8V, TA = 25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
Input Voltage Range
2.3
UVLO Threshold
1.7
Input DC Supply Current (Note 4)
PWM Mode
PFM Mode
Shutdown Mode
Regulated Feedback
Voltage VFB
Reference Voltage Line
Regulation
VOUT = 90%, ILOAD=0mA
VOUT = 105%, ILOAD =0mA
VEN = 0V, VIN=4.2V
TA = 25°C
TA = 0°C TA 85°C
TA = -40°C TA 85°C
VIN=2.7V to 5.5V
0.588
0.586
0.585
Output Voltage Line
Regulation
VIN = 2.7V to 5.5V
Output Voltage Load
Regulation
IOUT=10mA to 2000mA
Oscillation Frequency
VOUT =100%
VOUT =0V
On Resistance of PMOS ISW=100mA
On Resistance of NMOS ISW=-100mA
Peak Current Limit
VIN= 3V, VOUT =90%
EN Threshold
0.40
EN Leakage Current
SW Leakage Current
VEN=0V,VIN=VSW=3.6V
TYP
1.8
160
40
0.1
0.600
0.600
0.600
0.04
0.04
0.5
1.5
300
90
80
4
1.0
±0.01
±0.01
MAX UNIT
6
V
1.9
V
µA
240
µA
75
µA
1.0
µA
0.612
V
0.613
V
0.615
V
0.40 %/V
0.4
%
%/A
MHz
kHz
150 mΩ
150 mΩ
A
1.50
V
±1.0 µA
±1.0 µA
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 (50°C/W).
Note 3: 100% production test at +25°C. Specifications over the temperature range are guaranteed by
design and characterization.
Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching
frequency.
MT3430 Rev1.0
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