ML63
ML63 Series DC-DC Converter
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Application
u
u
u
u
Power Source of Portable Products
Palmtops
Portable Cameras and Video Recorders
Wireless mouse and keyboard
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Features
l
l
l
l
l
l
l
Small number of external components: inductor, diode and
capacitor.
Ultra low input current : Typical 0.6uA (at no load, 1.5V
input)
Oscillator : 100 kHz, 180 kHz ( + 15%)
Low ripple and noise
Low startup voltage : Max 0.9V (with 1mA input)
High Efficiency: Typical 80%
Package Available:
SOT- 89 (500mW) & TO - 92 (300mW)
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General Description
The ML63 is a group of VFM Step-up DC/DC
converter IC with ultra-low supply current by
CMOS process.
It consists of an oscillator, a VFM control circuit, a
Lx switch driver transistor, a reference voltage unit,
an error amplifier for voltage detection and an Lx
switch protection circuit. It is suitable for use with
battery-powered instruments with low noise and
ultra low supply current.
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Block Diagram
Lx
LxSW
V
LX
limiter
Vref
Buffer
OUT
VFM
control
Vss
OSC
100KHz/180KHz
Error Amp
.
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Absolute Maximum Ratings
Parameter
Input Voltage
Output Current
Output Voltage
Continuous
Total Power
Dissipation
SOT-89
P
d
TO-92
T
opr
T
stg
300
-30 ~ +80
-40 ~ +125
o
Symbol
V
IN
I
OUT
V
OUT
Ratings
8
500
V
SS
-0.3 ~V
IN
+0.3
500
Units
V
mA
V
mW
C
C
Operating Ambient
Temperature
Storage Temperature
o
1/5
ML63
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Electrical Characteristics
VIN = 1.6V, IOUT = 10mA, Ta = 25
o
C,
unless otherwise provided.
ML63271 / ML63271A VOUT=2.7V
Parameter
Output Voltage
Startup Voltage
Hold-on Voltage
Oscillator Frequency
Input Current 1
Input Current 2
Lx Switching Current
Lx Leakage Current
Oscillator Duty Cycle
Efficiency
Input Voltage
Symbol
V
OUT
V
START
V
HOLD
F
OSC
I
IN1
I
IN2
I
LX
I
LXLEAK
MAXDTY
EFF
V
IN
Conditions
I
OUT
=1mA
I
OUT
=1mA
TYPE = ML63271A
TYPE = ML63271
At no load
V
IN
= 3.2V
V
LX
=0.4V, V
IN
=2.55V
V
IN
=3.5V, V
LX
=6.0V
Measuring Lx Waveform
Min
2.633
0.7
85
153
Typ
2.700
0.8
100
180
8
6
Max
2.767
0.9
115
207
12
Units
V
V
V
KHz
KHz
uA
uA
mA
uA
%
%
V
40
0.5
75
80
8
VIN = 1.8V, IOUT = 10mA, Ta = 25
o
C,
unless otherwise provided.
ML63301 / ML63301A VOUT=3.0V
Parameter
Output Voltage
Startup Voltage
Hold-on Voltage
Oscillator Frequency
Input Current 1
Input Current 2
Lx Switching Current
Lx Leakage Current
Oscillator Duty Cycle
Efficiency
Input Voltage
Symbol
V
OUT
V
START
V
HOLD
F
OSC
I
IN1
I
IN2
I
LX
I
LXLEAK
MAXDTY
EFF
V
IN
Conditions
I
OUT
=1mA
I
OUT
=1mA
TYPE = ML63301A
TYPE = ML63301
At no load
V
IN
= 3.5V
V
LX
=0.4V, V
IN
=2.85V
V
IN
=3.5V, V
LX
=6.0V
Measuring Lx Waveform
Min
2.925
0.7
85
153
Typ
3.000
0.8
100
180
8
6
Max
3.075
0.9
115
207
12
Units
V
V
V
KHz
KHz
uA
uA
mA
uA
%
%
V
40
0.5
75
80
8
VIN = 1.8V, IOUT = 10mA, Ta = 25
o
C,
unless otherwise provided.
ML63501
VOUT=5.0V
Parameter
Output Voltage
Startup Voltage
Hold-on Voltage
Oscillator Frequency
Input Current 1
Input Current 2
Lx Switching Current
Lx Leakage Current
Oscillator Duty Cycle
Efficiency
Input Voltage
Symbol
V
OUT
V
START
V
HOLD
F
OSC
I
IN1
I
IN2
I
LX
I
LXLEAK
MAXDTY
EFF
V
IN
Conditions
I
OUT
=1mA
I
OUT
=1mA
At no load
V
IN
= 3.5V
V
LX
=0.4V, V
IN
=2.85V
V
IN
=3.5V, V
LX
=6.0V
Measuring Lx Waveform
Min
4.925
0.7
85
Typ
5.000
0.8
100
8
6
Max
5.075
0.9
115
12
Units
V
V
V
KHz
uA
uA
mA
uA
%
%
V
40
0.5
75
80
8
2/5
ML63
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Pin Configuration
SOT-89 :
Pin Number
1
2
3
Pin Name
VSS
VOUT
Lx
Description
Ground
Voltage Output/Internal power supply
Switch
TO-92 :
Pin Number
1
2
3
Pin Name
VSS
VOUT
Lx
Description
Ground
Voltage Output/Internal power supply
Switch
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Application Notes
Note on Use
1. It is recommended to use capacitor with a capacity of 10uF or more for good frequency characteristics, otherwise it will lead
to high output ripple. Tantalum type capacitor is recommended. As there may be the case where a spike-shaped high voltage
is generated by the inductor when Lx transistor is turned off, the operating voltage of capacitor should be at least three times
of the output set voltage so as to avoid over-voltage damage.
2. It is recommended to use inductor has sufficiently small d.c. resistance, large allowable current and hardly reaches magnetic
saturation. When the inductance of inductor is small, there may be the case that the inductor current exceeds the absolute
maximum ratings at the maximum load condition.
3. It is recommended to place external components as close as possible to the DC/CD converter so as to minimize the
interconnection parasitic between components and DC/DC converter, especially for the capacitor connected to VOUT pin. It
is recommended to place 0.1uF ceramic capacitor between VOUT pin and VSS pin.
4. It is recommended to provide sufficient grounding for VSS pin. This will help to stable the zero level within DC/DC
converter induced by the switching current level variation during operation. And the insufficient grounding may result in
unstable operation of DC/DC converter.
3/5
ML63
Typical Application Circuit
1. Step-up Circuit
Typical Value:
Inductor: 270uH
Capacitor: Aluminium type, 4.7uF.
Diode: Schottky Diode with forward
voltage drop of 0.2V or less
2. Step-down Circuit
3. Step-up/Step-down Circuit
Note : The starter circuit is necessary for above circuits.
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ML63
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Ordering Information
Designator
a
Description
Output Voltage
eg.
27=2.7V
30=3.0V
50=5.0V
Oscillator Frequency
1 = 180KHz
1A = 100KHz
Package Type
P = SOT-89
T = TO-92
Device Orientation
R = Embossed Tape
(Orientation of Device : Right)
L = Embossed Tape
(Orientation of Device : Left)
B = Bag (TO-92)
b
c
d
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History of Revision
REV
DESCRIPTION
First Official Specification
DATE
23/10/02
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
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