CASC
AEROSEMI
1.3A,2.3V-6V Input,1.5MHz
Synchronous Step-Down Converter
GENERAL DESCRIPTION
The MT3410L is high-efficiency,high frequency
synchronous step-down DC-DC regulator ICs
capable of delivering up to 1.3A output
currents.The MT3410L can operate over a wide
input voltage range from 2.3V to 6V and integrates
main switch and synchronous switch with very
low R
DS(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 MT3410L 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 wide range of the load.
The MT3410L is offered in a low profile 5-pin SOT
package,and is available in an adjustable version.
MT3410L
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
1.3A 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
100% Duty Cycle in Dropout Operation
Low Quiescent Current: 35μA
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1μA Shutdown Current
SOT23-5 package
APPLICATIONS
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Portable Instruments
Digital Still and Video Cameras
Set Top Box
TYPICAL APPLICATION
V
IN
VIN
SW
L 2.2μH
R1
200k
1%
R2
100k
1%
C1
22pF
opt.
V
OUT
MT3410L
C
IN
22μF
EN
GND
FB
C
OUT
22μF
Figure 1. Basic Application Circuit
MT3410L Rev1.0
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AEROSEMI
MT3410L 1.3A ,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 (V
IN
+0.3V)
SW Voltage………………...-0.3V to (V
IN
+0.3V)
Power Dissipation………………………...0.4W
Thermal Resistance
θ
JC
………………..130°C/W
Thermal Resistance
θ
JA
………………..250°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
EN
GND
SW
1
2
3
4
VIN
5
FB
Package
Top Marking
MT3410L
SOT23-5
AS11DW
5-LEAD PLASTIC SOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/ W,
θ
JC
= 130°C/W
PIN DESCRIPTION
Pin Name
EN
GND
SW
VIN
FB
Pin Number
1
2
3
4
5
Description
Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN below
0.3V to turn it off. Do not leave EN floating.
Analog 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.
Output Voltage Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal reference voltage.
MT3410L Rev1.0
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AEROSEMI
MT3410L 1.3A ,1.5MHz Synchronous Step-Down Converter
ELECTRICAL CHARACTERISTICS
(Note 3)
(V
IN
=V
EN
=3.6V, V
OUT
=1.8V, T
A
= 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
V
OUT
= 90%, I
LOAD
=0mA
PFM Mode
V
OUT
= 105%, I
LOAD
=0mA
Shutdown Mode
V
EN
= 0V, V
IN
=4.2V
T
A
= 25°C
0.588
Regulated Feedback
T
A
= 0°C
≤T
A
≤85°C
0.586
Voltage V
FB
T
A
= -40°C
≤T
A
≤85°C
0.585
Reference Voltage Line
V
IN
=2.5V to 6V
Regulation
Output Voltage Line
V
IN
=2.5V to 6V
Regulation
Output Voltage Load
Regulation
V
OUT
=100%
Oscillation Frequency
V
OUT
=0V
On Resistance of PMOS
I
SW
=100mA
On Resistance of NMOS
I
SW
=-100mA
Peak Current Limit
V
IN
= 3V, V
OUT
=90%
EN Threshold
0.30
EN Leakage Current
SW Leakage Current
V
EN
=0V,V
IN
=V
SW
=5V
TYP
1.9
140
35
0.1
0.600
0.600
0.600
0.04
0.04
0.5
1.5
300
130
100
2
1.0
±0.01
±0.01
MAX
6
2.1
300
70
1.0
0.612
0.613
0.615
0.40
0.40
UNIT
V
V
μA
μA
μA
μA
V
V
V
%/V
%
%
MHz
kHz
mΩ
mΩ
A
V
μA
μA
200
200
1.50
±1.0
±1.0
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).
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.
MT3410L Rev1.0
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AEROSEMI
MT3410L 1.3A ,1.5MHz Synchronous Step-Down Converter
TYPICAL PERFORMANCE CHARACTERISTICS
MT3410L Rev1.0
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AEROSEMI
MT3410L 1.3A ,1.5MHz Synchronous Step-Down Converter
FUNCTIONAL BLOCK DIAGRAM
EN
VIN
RS
OSC &
Shutdown
Control
Slope
Compensation
Current
Sensor
Control Logic
Driver
SW
Current Limit
Detector
PWM/PFM
Mode
Detector
FB
Error
Amplifier
PWM
Compartor
Zero Detector
UVLO & Power
Good Detector
VREF
GND
Figure 2. MT3410L Block Diagram
FUNCTIONAL DESCRIPTION
MT3410L 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 R
DS(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 MT3410L requires only three
external power components (C
IN
,C
OUT
and L).The
MT3410L Rev1.0
adjustable version can be programmed with
external feedback to any voltage,ranging from
0.6V to the input voltage.At dropout operation,the
converter duty cycle increases to 100% and the
output voltage tracks the input voltage minus the
R
DS(ON)
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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