MT9216
1.5MHz, 600mA Synchronous
GENERAL DESCRIPTION
Step-Down Converter
FEATURES
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High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
600mA Output Current
No Schottky Diode Required
2.3V to 5.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Low Quiescent Current: 20µA
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
The MT9216 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 MT9216 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.
The MT9216 is offered in a low profile (1mm)
5-pin, thin SOT package, and is available in
an adjustable version and fixed output
voltage of 1.2V,1.5V, 1.8V,2.5V and 3.3V.
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. Basic Application Circuit
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MT9216
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage ……… -0.3V to 6V
RUN,VOUT Voltages……... -0.3V to 6V
Peak SW Sink and Source Current…1.8A
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
Temp Range
-40°C to +85°C
OUTPUT
VOLTAGE (V)
OUTPUT
CURRENT (A)
MT9216-ADJ
1.5MHz
ADJ
0.6
Pin Description
PIN
NAME
FUNCTION
Power Supply Input.
Must be closely decoupled to GND with a 4.7µF
or greater ceramic capacitor.
Ground pin
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 RUN floating.
Output Voltage Feedback 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.
1
2
3
4
5
VIN
GND
EN
FB
SW
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MT9216
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%, Iload=0mA
Vout = 105%, Iload=0mA
V
RUN
= 0V, V
IN
=4.2V
T
A
= 25°C
T
A
= 0°C
≤
T
A
≤
85°C
0.588
0.586
0.585
140
20
0.1
0.600
0.600
0.600
0.04
0.04
0.5
1.5
300
0.35
0.3
1.5
1.0
±0.01
±0.01
1.50
±1.0
±1.0
0.45
0.45
300
35
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
T
A
= -40°C
≤
T
A
≤
85°C
Vin=2.7V to 5.5V
V
IN
= 2.7V to 5.5V
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
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MT9216
Typical Performance Characteristics
Efficie ncy v s. Output Curre nt
100
95
90
85
80
75
70
65
60
55
50
45
40
0.1
1
10
100
1000
VIN=5.0V
VIN=3.6V
VIN=2.8V
Efficiency(%)
V
OUT
=2.5V
o
T
A
=25 C
Output Current(mA)
Oscillator Frequency vs Temperature
Output Voltage VS Output Current
1.84
1.83
1.82
1.800
1.700
FREQUENCY (MHz)
600
Output Voltage(V)
1.600
1.500
1.400
1.300
1.81
1.80
1.79
1.78
1.77
1.76
0
100
200
300
400
500
VIN =3.6V
Vout=1.8V
Output Current(mA)
1.200
-48 -32 -16
0
16
32
48
64
80
96
TEMPERATURE (C)
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MT9216
VOUT
10mV/DIV
Vin=3.6V
Vout=1.8V
Iout=50mA
SW
5V/DIV
IL
500mA/DIV
400ns/DIV
PFM MODE
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