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| MITSUMI Step-Up DC/DC Converter MM1331 Step-Up DC/DC Converter (VFF) Monolithic IC MM1331 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 0.85V, making this device ideal for the power supply circuits of portable equipment driven by a single battery. Under small load currents oscillation is stopped and the charge stored in an externally mounted capacitor is output in an intermittent oscillation design, to improve the efficiency of operation under light loads. Features 1. 2. 3. 4. Low-voltage operation possible, 0.85V (no-load) Internal oscillation circuit Intermittent oscillation design for improved light-load efficiency Numerous output voltages available (seven ranks) Package SOT-25 Output Voltage Rank Rank Voltage (V) A 5.0 B 3.2 C 3.5 D 3.0 E 2.5 G 2.2 H 2.7 Applications 1. Pagers 2. Separate vibrators 3. Other portable equipment Pin Assignment 1 2 5 4 3 4 1 2 3 5 GND SUB VL VOUT VIN SOT-25 *Pin 2 is the SUB pin, and should be connected to GND. MITSUMI Step-Up DC/DC Converter MM1331 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 Voltage applied to VOUT pin Voltage applied to VL pin Allowable loss Pd Symbol TSTG TOPR Ratings -40~+125 -20~+75 -0.3~+10 -0.3~+10 -0.3~+10 150 Units C C V V V mW Recommended Operating Conditions Item Operating temperature Operating voltage Symbol Top Vop Ratings -20~+75 +0.85~VOUT Units C V MITSUMI Step-Up DC/DC Converter MM1331 Electrical Characteristics Item Operating voltage Output voltage rank A rank B rank C rank D rank E rank G rank H (Except where noted otherwise, VIN=1.5V, IO=1mA) Measurement conditions No-load Min. Typ. Max. Units 0.85 4.80 3.07 3.36 VIN=1.5V, Io=1mA 2.88 2.40 2.11 2.59 Ta=-20~75C VIN=1.1 1.7V, Io=1mA 7mA 3 5 60 70 115 VIN=1.5V, Io=0 5.0 3.2 3.5 3.0 2.5 2.2 2.7 100 3 1 4.5 7.5 1 120 185 VOUT 5.20 3.33 3.64 3.12 2.60 2.29 2.81 PPM/C %/C %/mA A A A mV kHz V V Output voltage temperature coefficient Input fluctuations Load fluctuations VIN pin consumption current VOUT pin consumption current VL pin leakage current Output ripple voltage Oscillation frequency VIN=1.5V, VOUT=VOUT max.+0.05 VOUT=VOUT max.+0.05 VL=10V VIN=1.5V, Io=1mA VIN=1.5V Note: Electrical characteristics assume use of the following externally mounted components. Coil Capacitor SBD Mitsumi model C5-R tantalum electrolytic Rohm model RB451F L=120H C=33F Application Circuits Note: Coil: L = 120H (Mitsumi model C5-R) Capacitor : C=33F (tantalum electrolytic capacitor) Schottky barrier diode (Rohm model RB451F) MITSUMI Step-Up DC/DC Converter MM1331 Characteristics Tek Stop : 100kS/S 402 Acqs Conditions ;VIN=1.5V, Io=1mA L=120H (C5-R) CIN=COUT=33F (tantalum) SBD ; RB451F 1 VOUT pin waveform 50mV/div 500S/div VL pin waveform 1V/div 2 Ch1 50.0mV Ch2 100V M 500S Ch2 2.66V VOUT 4 Output voltage (V) 3 IO=100mA 2 IO=1mA IO=5mA 1 0 0.5 1.0 Input voltage (V) 1.5 VIN *The above characteristics are representative, and are not guaranteed values. |
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