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ML63
ML63 Series DC-DC Converter
v Application
u u u u Power Source of Portable Products Palmtops Portable Cameras and Video Recorders Wireless mouse and keyboard
v 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)
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
Lx LxSW
VLX
limiter
Vref
Buffer
OUT
VFM
control
Vss
OSC 100KHz/180KHz
Error Amp.
v Absolute Maximum Ratings
Parameter Input Voltage Output Current Output Voltage Continuous Total Power Dissipation SOT-89 Pd TO-92 Topr Tstg 300 -30 ~ +80 -40 ~ +125
o
Symbol VIN IOUT VOUT
Ratings 8 500 VSS-0.3 ~VIN+0.3 500
Units V mA V mW C C
Operating Ambient Temperature Storage Temperature
o
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ML63
v Electrical Characteristics
VIN = 1.6V, IOUT = 10mA, Ta = 25 oC, 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 VOUT VSTART VHOLD FOSC IIN1 IIN2 ILX ILXLEAK MAXDTY EFF VIN Conditions IOUT=1mA IOUT=1mA TYPE = ML63271A TYPE = ML63271 At no load VIN = 3.2V VLX=0.4V, VIN=2.55V VIN=3.5V, VLX=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 oC, 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 VOUT VSTART VHOLD FOSC IIN1 IIN2 ILX ILXLEAK MAXDTY EFF VIN Conditions IOUT=1mA IOUT=1mA TYPE = ML63301A TYPE = ML63301 At no load VIN = 3.5V VLX=0.4V, VIN=2.85V VIN=3.5V, VLX=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 oC, 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 VOUT VSTART VHOLD FOSC IIN1 IIN2 ILX ILXLEAK MAXDTY EFF VIN Conditions IOUT=1mA IOUT=1mA At no load VIN = 3.5V VLX=0.4V, VIN=2.85V VIN=3.5V, VLX=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
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ML63
v 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
v 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.
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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.
4/5
ML63
v 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
v 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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