MT3410
Rev.V1.2
1.5MHz, 1.5A Synchronous Step-Down Converter
FEATURES
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High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
1500mA Output Current
No Schottky Diode Required
2.3V to 6V Input Voltage Range
Adjustable Output Voltage Range
Options from 0.6V to Vin
100% Duty Cycle Low Dropout
Operation
Low Quiescent Current: 35µA
Slope Compensated Current Mode
Control for Excellent Line and Load
Transient Response
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Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1µA Shutdown Current
Tiny SOT23-5 Package
GENERAL DESCRIPTION
The
MT3410
are
high-efficiency,
high
frequency synchronous step-down DC-DC
regulator ICs capable of delivering up to
1.5A output currents. The MT3410 can
operate over a wide input voltage range from
2.3V to 6V and integrates main switch and
synchronous switch with very low RDS(ON)
to minimize the conduction loss.
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 MT3410 can also run at
100% duty cycle for low dropout operation,
extending battery life in portable system.
This device offers two operation modes,
PWM mode and PFM Mode switching
control, which allows a high efficiency over
the wider range of the load.
The MT3410 is offered in a low profile (1mm)
5-pin, thin SOT package, and is available in
an adjustable version.
APPLICATIONS
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Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Digital Still and Video Cameras
MP3 Players
Typical Application
Figure 1. Typical Application Circuit
Aerosemi Technology Co.,LTD
1
MT3410
Rev.V1.2
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage ……-0.3V to 6.5V
RUN,FB Voltages……... -0.3V to 6.5V
Peak SW Sink and Source Current...2.5A
Operating Temperature Range … -40°C to +85°C
Junction Temperature(Note2) ……………..125°C
Lead Temperature(Soldering,10s) ….…..+300°C
SW Voltage …………-0.3V to (Vin+0.3V) Storage Temperature Range ..…-65°C to 150°C
Package/Order Information
Part Number
SWICHING
FREQUENCY
Temperature
Range
-40°C to +85°C
OUTPUT
VOLTAGE (V)
OUTPUT
CURRENT (A)
MT3410
1.5MHz
ADJ
1.5
Pin Description
PIN
NAME
FUNCTION
Chip Enable Pin. Drive RUN above 1.5V to turn on the part.
RUN below 0.3V to turn it off. Do not leave RUN floating.
Ground Pin
Power Switch Output. It is the switch node connection to Inductor.
This pin connects to the drains of the internal P-ch and N-ch MOSFET
switches.
Power Supply Input.
Must be closely decoupled to GND with a 10µF
or greater ceramic capacitor.
Feedback Input. An internal resistive divider divides the output voltage
down for comparison to the internal reference voltage.
Drive
1
2
3
RUN
GND
SW
4
5
VIN
FB
Aerosemi Technology Co.,LTD
2
MT3410
Rev.V1.2
Electrical Characteristics
Parameter
Input Voltage Range
UVLO Threshold
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
Oscillation Frequency
On Resistance of PMOS
ON Resistance of NMOS
Peak Current Limit
RUN Threshold
RUN Leakage Current
SW Leakage Current
V
RUN
=0V,V
IN
=Vsw=5V
Vout=100%
Vout=0V
I
SW
=100mA
I
SW
=-100mA
V
IN
= 3V, Vout=90%
0.30
(Note 4)
Vout = 90%, I
Load
=0mA
Vout = 105%, I
Load
=0mA
V
RUN
= 0V, V
IN
=4.2V
T
A
= 25°C
T
A
= 0°C
≤
T
A
T
A
= -40°C
≤
T
A
Vin=2.5V to 6V
V
IN
= 2.5V to 6V
≤
85°C
≤
85°C
0.588
0.586
0.585
140
35
0.1
0.600
0.600
0.600
0.04
0.04
0.5
1.5
300
0.13
0.1
2.5
1.0
±0.01
±0.01
1.50
±1.0
±1.0
0.2
0.2
300
70
1.0
0.612
0.613
0.615
0.40
0.4
(Note 3)
(V
IN
=V
RUN
=3.6V, V
OUT
=1.8V, T
A
= 25°C, unless otherwise noted.)
Conditions
MIN
2.3
1.7
1.9
TYP
MAX
6
2.1
unit
V
V
µA
µA
µA
µA
V
V
V
%/V
%
%
MHz
KHz
Ω
Ω
A
V
µA
µA
Note 1
:
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power dissipation P
D
according to the
following formula:
T
J
= T
A
+ (P
D
) x (250°C/W).
Note3:
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
Aerosemi Technology Co.,LTD
3
MT3410
Rev.V1.2
Typical Performance Characteristics
VOUT
10mV/DIV
Vin=3.6V
Vout=1.8V
Iout=50mA
SW
5V/DIV
IL
500mA/DIV
400ns/DIV
PFM MODE
Aerosemi Technology Co.,LTD
4
MT3410
Rev.V1.2
Functional Block Diagram
Figure 2. MT3410 Block Diagram
Functional Description
MT3410 is a synchronous buck regulator
IC that integrates the PWM/PFM control,
high-side and low-side MOSFETs on the
same die to minimize the switching
transition loss and conduction loss. With
ultra low RDS(ON) power switches and
proprietary PWM control, this regulator IC
can achieve the highest efficiency and the
highest switch frequency simultaneously
to minimize the external inductor and
capacitor size, and thus achieving the
minimum solution footprint.
The MT3410 requires only three external
power components (Cin, Cout and L). The
adjustable version can be programmed
with external feedback to any voltage,
ranging from 0.6V to the input voltage.
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5
At dropout operation, the converter duty
cycle increases to 100% and the output
voltage tracks the input voltage minus the
Rdson drop of the high-side MOSFET.
The
internal
error
amplifier
and
compensation provides excellent transient
response, load, and line regulation. Soft
start function prevents input inrush current
and output overshoot during start up.
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