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MT3420 Datasheet Preview

MT3420 Datasheet

2A Synchronous Step-Down DC/DC Converter

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MT3420 pdf
MT3420
1.4MHz, 2A Synchronous Step-Down DC/DC Converter
FEATURES
High Efficiency: Up to 95%
1.4MHz Constant Frequency Operation
2A Output Current
No Schottky Diode Required
2.4V to 5.5V Input Voltage Range
Output Voltage as Low as 0.6V
Low Quiescent Current: 40µA
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Inrush Current Limit and Soft Start
<1µA Shutdown Current
Available in DFN33-10 and WQFN-16L 3x3
package
APPLICATIONS
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Digital Still and Video Cameras
PC Cards
GENERAL DESCRIPTION
The MT3420 is a constant frequency, current mode
PWM 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 output voltage
can be regulated as low as 0.6V. The MT3420 can also
run at 100% duty cycle for low dropout operation,
extending battery life in portable system. 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
Figure 1. Basic Application Circuit
Package/Order Information
1



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MT3420 Datasheet Preview

MT3420 Datasheet

2A Synchronous Step-Down DC/DC Converter

No Preview Available !

MT3420 pdf
MT3420
Part Number
MT3420-ADJ
SWICHING
FREQUENCY
1.4MHz
Temp Range
-40°C to +85°C
OUTPUT
VOLTAGE (V)
ADJ
OUTPUT
CURRENT (A)
0.6
Electrical Characteristics (Note 3)
(VIN=VRUN=3.6V, VOUT=1.8V, TA = 25°C, unless otherwise noted.)
Parameter
Conditions
MIN
Input Voltage Range
2.4
UVLO Threshold
1.7
Input DC Supply Current
PWM Mode
PFM Mode
Shutdown Mode
Regulated Feedback
Voltage
Reference Voltage Line
Regulation
Output Voltage Line
Regulation
Output Voltage Load
Regulation
(Note 4)
Vout = 90%, Iload=0mA
Vout = 105%, Iload=0mA
VRUN = 0V, VIN=4.2V
TA = 25°C
Vin=2.7V to 5.5V
VIN = 2.7V to 5.5V
0.582
TYP
1.8
160
40
0.1
MAX unit
5.5 V
1.9 V
µA
240 µA
70 µA
1.0 µA
0.600 0.618 V
0.04 0.40 %/V
0.04 0.4 %
0.5 %
Oscillation Frequency
Vout=100%
Vout=0V
On Resistance of PMOS
ON Resistance of NMOS
Peak Current Limit
RUN Threshold
RUN Leakage Current
SW Leakage Current
ISW=100mA
ISW=-100mA
VIN= 3V, Vout=90%
VRUN=0V,VIN=Vsw=3.6V
1.4 MHz
0.30
300
0.10
0.09
3.5
1.0
±0.01
±0.01
0.2
0.15
1.50
±0.1
±1.0
KHz
A
V
µA
µA
2


Part Number MT3420
Description 2A Synchronous Step-Down DC/DC Converter
Maker ETC
Total Page 2 Pages
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