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| MITSUMI Step-Up DC/DC Converter (PWM) MM1349 Step-Up DC/DC Converter (PWM) Monolithic IC MM1349 Outline This is a converter IC which steps up the DC input voltage to output a fixed voltage level. Utilizing technology for low-voltage operation, which is a feature of Mitsumi semiconductor processes, operation is possible beginning at 0.90V, making this device ideal for the power supply circuits of portable equipment driven by a single battery. Because PWM oscillation is adopted, an output waveform can be obtained with a smaller peak-to-peak voltage than is possible for VFM devices. Features 1. 2. 3. 4. Low-voltage operation possible, 0.90V (no-load) Internal oscillation circuit Adoption of PWM oscillation for output waveform with small peak-to-peak voltage Numerous output voltages available (seven ranks) Package SOT-25 Output Voltage Rank Rank Voltage (V) A 5.0 B 3.5 C 3.2 D 3.0 E 2.7 G 2.5 H 2.2 Applications 1. Pagers 2. Separate vibrators 3. Other portable equipment Pin Assignment 1 5 4 2 3 1 2 3 4 5 SOT-25 GND SUB VL VOUT VIN *Pin 2 is the SUB pin, and should be connected to GND. MITSUMI Step-Up DC/DC Converter (PWM) MM1349 Block Diagram Note: Pin 2 is the SUB pin, and should be connected to GND. Absolute Maximum Ratings Item Storage temperature Operating temperature Voltage applied to VIN pin (Ta=25C) Symbol TSTG TOPR Ratings -40~+125 -20~+75 -0.3~+10.0 -0.3~+10.0 -0.3~+10.0 Pd 150 Units C C V V V mW Voltage applied to VOUT pin Voltage applied to VL pin Allowable loss Recommended Operating Conditions Item Operating temperature Operating voltage Symbol Top Vop Ratings -20~+75 +0.9~VOUT Units C V MITSUMI Step-Up DC/DC Converter (PWM) MM1349 Electrical Characteristics Item Operating voltage (Ta=25C)(Except where noted otherwise,VIN=1.5V, IO=1mA) Measurement conditions No-load A B C Min. Typ. Max. Units 0.90 4.80 3.36 3.07 2.88 2.59 2.40 2.11 5.00 3.50 3.20 3.00 2.70 2.50 2.20 100 1 1 80 1 35 65 95 VOUT 5.20 3.64 3.33 3.12 2.81 2.60 2.29 ppm/C %/V %/mA A A kHz V V Symbol VIN Output voltage VOUT VIN=1.5V, Io=1mA D E F G Output voltage temperature coefficient Input fluctuations Load fluctuation Efficiency VL pin leakage current Oscillation frequency IVLLK fOSC Ta=-20~75C VIN=1.1 1.7V, Io=1mA 4mA VIN=1.5V, Io=0 VL=10V VIN=1.5V, Io=1mA VIN=1.5V, Io=1mA Note: These characteristics assume the following externally mounted components. Coil: L=120H (Mitsumi model C5-R) Capacitor: C=33F (tantalum electrolytic capacitor) Schottky barrier diode (Rohm model RB451F) Measuring Circuit Note 1: A: DC ammeter V: DC voltmeter Note 2: L=120H Application Circuits Coil: L=120H (Mitsumi model C5-R) Capacitor: C=33F (tantalum electrolytic capacitor) Schottky barrier diode (Rohm model RB451F) |
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