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ML63
ML63 Series DC-DC Converter
v
Application
u Power Source of Portable Products
u Palmtops
u Portable Cameras and Video Recorders
u Wireless mouse and keyboard
v
Features
l Small number of external components: inductor, diode and
capacitor.
l Ultra low input current : Typical 0.6uA (at no load, 1.5V
input)
l Oscillator : 100 kHz, 180 kHz ( + 15%)
l Low ripple and noise
l Low startup voltage : Max 0.9V (with 1mA input)
l High Efficiency: Typical 80%
l Package Available:
SOT- 89 (500mW) & TO - 92 (300mW)
v
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Units
Input Voltage
V
IN
8
V
Output Current
I
OUT
500
mA
Output Voltage
V
OUT
V
SS
-0.3 ~V
IN
+0.3
V
SOT-89
500
Continuous
Total Power
Dissipation
TO-92
P
d
300
mW
Operating Ambient
Temperature
T
opr
-30 ~ +80
o
C
Storage Temperature
T
stg
-40 ~ +125
o
C
v
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.
v
Block Diagram
V
LX
limiter
Buffer
OSC
100KHz/180KHz
Vref
VFM control
OUT
Error Amp
.
Lx
Vss
LxSW
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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
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
V
OUT
2.633 2.700 2.767
V
Startup Voltage
V
START
I
OUT
=1mA
0.8
0.9
V
Hold-on Voltage
V
HOLD
I
OUT
=1mA
0.7
V
TYPE = ML63271A
85
100
115
KHz
Oscillator Frequency
F
OSC
TYPE = ML63271
153
180
207
KHz
Input Current 1
I
IN1
At no load
8
12
uA
Input Current 2
I
IN2
V
IN
= 3.2V
6
uA
Lx Switching Current
I
LX
V
LX
=0.4V, V
IN
=2.55V
40
mA
Lx Leakage Current
I
LXLEAK
V
IN
=3.5V, V
LX
=6.0V
0.5
uA
Oscillator Duty Cycle
MAXDTY
Measuring Lx Waveform
75
%
Efficiency
EFF
80
%
Input Voltage
V
IN
8
V
VIN = 1.8V, IOUT = 10mA, Ta = 25
o
C, unless otherwise provided.
ML63301 / ML63301A VOUT=3.0V
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
V
OUT
2.925 3.000 3.075
V
Startup Voltage
V
START
I
OUT
=1mA
0.8
0.9
V
Hold-on Voltage
V
HOLD
I
OUT
=1mA
0.7
V
TYPE = ML63301A
85
100
115
KHz
Oscillator Frequency
F
OSC
TYPE = ML63301
153
180
207
KHz
Input Current 1
I
IN1
At no load
8
12
uA
Input Current 2
I
IN2
V
IN
= 3.5V
6
uA
Lx Switching Current
I
LX
V
LX
=0.4V, V
IN
=2.85V
40
mA
Lx Leakage Current
I
LXLEAK
V
IN
=3.5V, V
LX
=6.0V
0.5
uA
Oscillator Duty Cycle
MAXDTY
Measuring Lx Waveform
75
%
Efficiency
EFF
80
%
Input Voltage
V
IN
8
V
VIN = 1.8V, IOUT = 10mA, Ta = 25
o
C, unless otherwise provided.
ML63501 VOUT=5.0V
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
V
OUT
4.925 5.000 5.075
V
Startup Voltage
V
START
I
OUT
=1mA
0.8
0.9
V
Hold-on Voltage
V
HOLD
I
OUT
=1mA
0.7
V
Oscillator Frequency
F
OSC
85
100
115
KHz
Input Current 1
I
IN1
At no load
8
12
uA
Input Current 2
I
IN2
V
IN
= 3.5V
6
uA
Lx Switching Current
I
LX
V
LX
=0.4V, V
IN
=2.85V
40
mA
Lx Leakage Current
I
LXLEAK
V
IN
=3.5V, V
LX
=6.0V
0.5
uA
Oscillator Duty Cycle
MAXDTY
Measuring Lx Waveform
75
%
Efficiency
EFF
80
%
Input Voltage
V
IN
8
V
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ML63
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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.
v
Pin Configuration
SOT-89 :
Pin Number Pin Name
Description
1
VSS
Ground
2
VOUT
Voltage Output/Internal power supply
3
Lx
Switch
TO-92 :
Pin Number Pin Name
Description
1
VSS
Ground
2
VOUT
Voltage Output/Internal power supply
3
Lx
Switch
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ML63
Typical Application Circuit
1. Step-up Circuit
2. Step-down Circuit
3. Step-up/Step-down Circuit
Note : The starter circuit is necessary for above circuits.
Typical Value:
Inductor: 270uH
Capacitor: Aluminium type, 4.7uF.
Diode: Schottky Diode with forward
voltage drop of 0.2V or less
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ML63
REV
DESCRIPTION
DATE
First Official Specification
23/10/02
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Ordering Information
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History of Revision
Designator
Description
Output Voltage
eg.
27=2.7V
30=3.0V
a
50=5.0V
b
Oscillator Frequency
1 = 180KHz
1A = 100KHz
c
Package Type
P = SOT-89
T = TO-92
d
Device Orientation
R = Embossed Tape
(Orientation of Device : Right)
L = Embossed Tape
(Orientation of Device : Left)
B = Bag (TO-92)
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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