CYT2606E21T

CYT2606L PFM Step-Up DC-DC Converter General Description The CYT2606L Series are PFM step-up DC-DC converters with very low ripple noise due to the high operation frequency. The maximum operation frequency is 400KHz. Only three components are required to realize the conversion from the battery voltage to a selected output voltage. A driver pin (EXT) is provided for driving external power transistor to extend the output current capability where large current is required. Enable pin (EN) is also provided so that the circuit can be powered down. Features 400KHz Maximum Operation Frequency 2.0V to 5.0V Output Voltage With 0.1V Step Low Start-up Voltage: 0.8V at 1mA ±2% Output Voltage Accuracy Up to 88% Efficiency Output current: 300mA at 2.5V input, 3.3V output Low Ripple and Low Noise Output Current Extendable by External Switch Applications Power source for applications where a higher voltage than the battery voltage is required One to three cell battery devices Power source for cameras, camcorders, VCRs, PDAs, pagers and hand held communication instrument Ordering Information Typical Applications 1 of 1 CYT2606L Block Diagram Current limiting comparator LX EXT + VOUT buffer PFM control Error Amplifier + 1.24V bandgap EN Chip Enable OSC 400KHz GND Pin Assignment Pin Name CYT2606L Part Marking and Package Type CYT2606L CYT2606L CYT2606L CYT2606L CYT2606L Description LXXT SOT-23-3 LXXF SOT-23-5 LXXE SOT-89 EXXT SOT-23-3 EXXF SOT-23-5 EXXE SOT-89 LX EXT VOUT EN GND NC 2 3 1 - 5 2 1 4 3 3 2 1 - 2 3 1 - 5 2 1 4 3 3 2 1 - Switching pin Buffer output for external transistor Output voltage Chip enable (active high) Ground No connection 2 of 2 CYT2606L Absolute Maximum Ratings Type Voltage Symbol Vmax Vmin-max Current ILXmax IEXTmax Power dissipation Psot-23-3 Psot-23-5 Psot-89 Thermal Tmin-max Tstorage ESD VESD Description Maximum voltage on VOUT and VLX pins Voltage range on EXT and EN pins Maximum current on LX pin Maximum current on EXT pin Maximum Power dissipation for SOT-23-3 package Maximum Power dissipation for SOT-23-5 package Maximum Power dissipation for SOT-89 package Operation temperature range Storage temperature range ESD voltage for human body mode Value 8 -0.3-VOUT+0.3 1000 100 0.25 0.25 0.5 -20-85 -40-165 2000 Unit V V mA mA W W W o C C o V Electronic Characteristics Parameter Output voltage accuracy Maximum input voltage Start-up voltage Hold-on voltage Maximum oscillation frequency Oscillator duty cycle Efficiency Current limit Input current at no load Symbol △VOUT VINMAX VSTART VHOLD FMAX DCOSC η ILIMIT IIN0 VIN=1.8V VOUT=3.0V VIN=1.8V VOUT=5.0V Input standby current EN “High” voltage level EN “low” level EN “high” input current EN “low” input current EXT output current -0.1 -5 5 IINQ No load, EN=“low” 0.4*VOUT 0.2 0.1 600 ILOAD=1mA, VIN:0→2V ILOAD=1mA, VIN:2→0V 0.6 350 75 400 80 85 800 20 25 1 450 85 88 1000 Test Condition Min -2 0.7 Typ Max 2 VOUT 0.85 Unit % V V V KHz % % mA uA uA uA V V uA uA mA 3 of 3 CYT2606L Typical Characteristics (Using Internal Switch Transistor) Start-up/Hold-on vs. Output Current Start-up/Hold-on Voltage(V) 3 2.5 2 1.5 1 0.5 0 1 10 100 Output Current(mA) 1000 Start-up Hold-on L=47uH C=47uF Output Voltage vs. Output Current 4 3.5 Output Voltage (V) 2V 2.5V 3V 3 1.5V 2.5 2 1.5 0 50 1V L=47uH C=47uF VOUT=3.4 V 100 150 200 250 300 350 Output Current (mA) 4 of 4 CYT2606L Efficiency vs. Output Current 90 88 86 84 82 80 78 76 74 72 1 10 Output Current(mA) Efficiency(%) 3V 2.5V 2V 1V 1.5V L=47uH C=47uF VOUT=3.4V 100 1000 Output Current vs. Ripple Voltage 250 200 3V Ripple Voltage(mV) 150 100 50 0 0 1V 2.5V 2V 1.5V L=47uH C=47uF VOUT=3.4V 150 200 250 300 350 50 100 Output Current (mA) 5 of 5 CYT2606L Output Current vs. Ripple Voltage 80 70 Ripple Voltage (mV) 60 50 40 30 20 10 0 0 50 100 150 200 250 300 350 Output Current (mA) 1V 1.5V 2V 3V 2.5V L=47uH C=2*47uF VOUT=3.4V Output Current vs. Ripple Voltage 70 60 Ripple Voltage(mV) 50 2V 3V 40 2.5V 30 20 10 1V 1.5V L=47uH C=3*47uF VOUT=3.4V 0 0 50 100 150 200 250 300 350 Output Current (mA) 6 of 6 CYT2606L Package Information Symbol A A1 A2 B c D E E1 e e1 L L1 ? Dimensions In Millimeters Min Max 1.050 1.250 0.000 0.100 1.050 1.150 0.300 0.400 0.100 0.200 2.820 3.020 1.500 1.700 2.650 2.950 0.950TYP 1.800 2.000 0.700REF 0.300 0.600 08 0 Dimensions In Inches Min Max 0.041 0.049 0.000 0.004 0.041 0.045 0.012 0.016 0.004 0.008 0.111 0.119 0.059 0.067 0.104 0.116 0.037TYP 0.071 0.079 0.028REF 0.012 0.024 8 7 of 7 CYT2606 L Symbol A b b1 c D D1 E E1 e e1 L Min 1.400 0.320 0.400 0.350 4.400 1.550 REF 2.300 3.940 1.500 TYP 3.000 TYP 0.900 Max 1.600 0.520 0.580 0.440 4.600 2.600 4.250 Min 0.055 0.013 0.016 0.014 0.173 0.061 REF 0.091 0.155 0.060TYP 0.118TYP Max 0.063 0.197 0.023 0.017 0.181 0.102 0.167 1.200 0.035 0.047 8 of 8