ML65

ML65 ML65 Series DC-DC Converter General Description The ML65 is a group of PWM Step-up DC/DC converter IC with ultra-low supply current by CMOS process. It consists of an oscillator, a PWM 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. Features Small number of external components: inductor, diode and capacitor. Ultra low input current : Typical 6uA Output V oltage Accuracy : +/- 2.5 % Low ripple and noise Low startup voltage : Max 0.9V (with 1mA input) High Efficiency: Typical 80% PackageAvailable: SOT- 89 (500mW), SOT-23 (150mW) & TO - 92 (300mW) Application Power Source of Portable Products Palmtops Portable Cameras and Video Recorders Wireless mouse and keyboard ML65 Version ML65A ML65C Package Designator M P T M P Package SOT23-3 SOT89-3 TO-92 SOT23-5 SOT89-5 Switching Transistor Build-in Transistor Build-in Transistor CE Function No Yes VDD Pin No No FB Pin No No Features Lx Lx+CE P1/7 Rev. B, July 2005 ML65 Marking: SOT23: ML65Cseries Marking ML65C33MRG ML65C50MRG Description XX = Production Date 41XX Code e.g. B2 42XX SOT89: ML65A Sseries Designator 1,2 3,4 5,6 Description Year Code e.g. 05 = Year 2005 Week Code e.g. 30 = Week 30 Output Voltage e.g. 30 = 3.0 V P2/7 Rev. B, July 2005 ML65 ML65A Pin Configuration Package Pin Number SOT23-3 SOT89-3 TO-92 1 1 1 3 2 2 2 3 3 Pin Name VSS VOUT LX Function Ground Output Voltage monitor, Internal IC Power Supply Switch Block Diagram Typical Applications P3/7 Rev. B, July 2005 ML65 ML65C Pin Configuration Package Pin Number SOT23-5 SOT89-5 4 5 2 2 5 4 1 3 3 1 Pin Name VSS VOUT Lx CE NC Function Ground Output Voltage monitor, Internal IC Power Supply Switch Chip Enable NC Block Diagram Typical Applications P4/7 Rev. B, July 2005 ML65 Absolute Maximum Ratings Parameter Input Voltage VDD Input Voltage Lx Pin Voltage EXT Pin Voltage CE Pin Voltage Lx Pin Current EXT Pin Current SOT-89 Continuous TO-92 Total Power Dissipation SOT-23 Operating Ambient Temperature Storage Temperature Symbol VIN VDD VLX VEXT VCE ILX IEXT Pd Ratings 10 10 10 -0.3 ~ VOUT + 0.3 -0.3 ~ VOUT + 0.3 600 + 30 500 300 150 Topr Tstg -25 ~ +85 -40 ~ +125 o o Units V V V V V mA mA mW C C Electrical Characteristics VIN = VOUT * 0.6, VSS = 0V, IOUT = 10mA, Ta = 25 oC, unless otherwise specified. Parameter Output Voltage Input Voltage Startup Voltage Hold-on Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current EXT “High” On Current Symbol VOUT VIN VSTART VHOLD IDD1 IDD2 ILX ILXLEAK IEXTH IOUT = 1mA, VIN: 0→2V IOUT = 1mA, VIN: 2→0V No external component, VIN = VOUT * 0.95 VIN = VIN + 0.5V VLX = 0.4V, VIN = VOUT * 0.95 VIN =VLX=6.0V No external component, VIN = VOUT * 0.95, VEXT = VOUT – 0.4V No external component, VIN = VOUT * 0.95, VEXT = 0.4V VIN = VOUT * 0.95 VIN = VOUT * 0.95 VOUT = 6.0V, VCE = 6.0V VOUT = 6.0V, VCE = 0.0V Conditions Min Typ Max Units Vout * Vout * Vout V 0.975 1.025 8 V 0.8 0.9 V 0.7 V 30~70 11~26 250 0.5 -5.5 uA uA mA uA mA EXT “Low” On Current CE “High” Voltage CE “Low” Voltage CE “High” Current CE “Low” Current Oscillator Frequency Duty Cycle Efficiency Slow-Start Time IEXTL VCEH VCEL ICEH ICEL FOSC MAXDTY EFF TSS 13 0.7 0.2 0.25 -0.25 80 5 100 87 85 15 92 25 mA V V uA uA KHz % % ms Note : 1. Schokkty diode: 1N5817 or 1N5819 (forward voltage drop : 0.2V) 2. Inductor : 47uH (ESR < 0.5Ω) 3. Capacitor : Tantalum type, 47 uF P5/7 Rev. B, July 2005 ML65 Electrical Characteristics ML65A30 VOUT = 3.0V Parameter Output Voltage Input Voltage Startup Voltage Hold-on Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current Oscillator Frequency Oscillator Duty Cycle Efficiency Slow –Start Time VIN = 1.8V, IOUT = 10mA, Ta = 25 oC, unless otherwise provided. Symbol Conditions Min Typ Max VOUT 2.925 3.000 3.075 VIN 8 VSTART IOUT = 1mA 0.8 0.9 VHOLD IOUT = 1mA 0.7 IDD1 VIN = 2.85V 30 IDD2 VIN = 3.05V 11 ILX VLX=0.4V, VIN=2.85V 250 ILXLEAK VIN=6.0V, VLX=6.0V 0.5 FOSC 100 150 MAXDTY 80 87 92 EFF 85 TSS 5 15 25 Units V V V V uA uA mA uA KHz % % ms ML65A33 VOUT = 3.3V VIN = 2.0V, IOUT = 10mA, Ta = 25 oC, unless otherwise provided. Parameter Symbol Conditions Min Typ Max Output Voltage VOUT 3.218 3.300 3.383 Input Voltage VIN 8 Startup Voltage VSTART IOUT = 1mA 0.8 0.9 Hold-on Voltage VHOLD IOUT = 1mA 0.7 Supply Current 1 IDD1 VIN = 3.135V 33 Supply Current 2 IDD2 VIN = 3.35V 12 Lx Switching Current ILX VLX=0.4V, VIN=3.135V 260 Lx Leakage Current ILXLEAK VIN=6.0V, VLX=6.0V 0.5 Oscillator Frequency FOSC 100 150 Oscillator Duty Cycle MAXDTY 80 87 92 Efficiency EFF 85 Slow –Start Time TSS 5 15 25 ML65A50 VOUT = 5.0V VIN = 3.0V, IOUT = 10mA, Ta = 25 oC, unless otherwise provided. Parameter Symbol Conditions Min Typ Max Output Voltage VOUT 4.875 5.000 5.125 Input Voltage VIN 8 Startup Voltage VSTART IOUT = 1mA 0.8 0.9 Hold-on Voltage VHOLD IOUT = 1mA 0.7 Supply Current 1 IDD1 VIN = 4.75V 70 Supply Current 2 IDD2 VIN = 5.05V 26 Lx Switching Current ILX VLX=0.4V, VIN= 4.75V 290 Lx Leakage Current ILXLEAK VIN=6.0V, VLX=6.0V 0.5 Oscillator Frequency FOSC 100 150 Oscillator Duty Cycle MAXDTY 80 87 92 Efficiency EFF 85 Slow –Start Time TSS 5 15 25 Units V V V V uA uA mA uA KHz % % ms Units V V V V uA uA mA uA KHz % % ms P6/7 Rev. B, July 2005 ML65 Application Notes 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/DC 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. 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. P7/7 Rev. B, July 2005