SC120 SEMTECH [Semtech Corporation], SC120 Datasheet
SC120
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SC120 Summary of contents
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... Single Cell (1.2V) August 6, 2009 Description The SC120 is a high efficiency, low noise, synchronous step-up DC-DC converter that provides boosted voltage levels in low-voltage handheld applications. The wide input voltage range allows use in systems with single NiMH or alkaline battery cells as well as in systems with = 1 ...
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... Marking Information 120 year of manufacture w = week of manufacture Ordering Information Device SC120ULTRT SC120EVB Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free package only. Device is WEEE and RoHS compliant. 6 OUT PRELIMINARY SC120 Package (1)(2) MLPD-UT-6 1.5×2 Evaluation Board 2 ...
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... OSC DC MAX DC MIN OUT > 0.3V OUT_RNG OUT 0V, (V set to 3.3V) INT_FB FB OUT 1. 3.3V DSP OUT PRELIMINARY SC120 (2) (°C/ 25°C. A Min Typ Max Units 0.7 3.8 V 0.85 V 0.1 1 μA 50 μA 1.2 MHz 3.3 V 1.8 4 1.182 1.200 1.218 V 0.1 μA ...
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... 3.0V LIM( > LIM(P)-SU IN OUT 25°C, V LXP 25°C, V LXN PRELIMINARY Min Typ 0.5 0.9 1.2 > V 150 3.3V 0.85 -0.2 SC120 Max Units Ω μA 1 μ μA μA 4 ...
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... 25°C A 0.1 0.2 0 (mA) OUT Effi ciency vs 4.0V) OUT OUT R1 = 1.37M Ω 590k Ω 4.7 μ 2. 25° 85°C A 0.1 0.2 0 (mA) OUT SC120 100 200 500 100 200 500 T = –40°C A 100 200 500 5 ...
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... Load Regulation (V = 4.0V) OUT R1 = 1.37M Ω 590k Ω 4.7 μ 2. 85° 25° –40° 85° 100 150 200 250 300 350 I (mA) OUT SC120 400 450 500 400 450 500 T = –40° 25°C A 400 450 500 6 ...
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... FB grounded 4.7 μ 75mA OUT 3 –40° 25° 85° 3.2 0.5 0.75 1 1.25 1.5 1.75 2 2.25 V (V) IN Line Regulation — PWM Mode ( 1.37M Ω 590k Ω 4.7 μ 75mA OUT –40° 25° 85°C 3 0.5 1 1.5 2 2.5 V (V) IN SC120 = 1.8V) OUT 1.3 1.4 1.5 = 3.3V) OUT 2.5 2. 4.0V) OUT 3 3 ...
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... Temperature Reg. — PWM Mode (V FB grounded 4.7 μ 75mA OUT 1. Junction Temperature ( C) Temperature Reg. — PWM Mode ( 1.37M Ω 590k Ω 4.7 μ 75mA OUT 1. Junction Temperature ( C) SC120 = 1.8V) OUT 75 100 = 3.3V) OUT 75 100 = 4.0V) OUT 75 100 8 ...
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... –40° 85°C A 0.7 0.8 0.9 1 1.1 1 grounded T = 25° –40° 85°C A 0.75 1 1.25 1.5 1.75 2 2. 1.37M Ω 590k Ω 25° –40° 85° 1 (V) IN SC120 (V = 1.8V) IN OUT 1.3 1.4 1 3.3V) IN OUT 2.5 2. 4.0V) OUT 3 ...
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... V (100mV/div) AC Coupled V ripple OUT (10mV/div) (100mA/div) (5V/div) PRELIMINARY = 3.3V 1mA OUT -20 Temperature (°C) Load Transient (PWM to PWM 3.3V 1.5V, T =25°C OUT IN A OUT Time = (100μs/div) PWM Operation V = 3.3V 1.5V 50mA OUT IN OUT Time = (400ns/div) SC120 80 100 10 ...
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... Output voltage supply pin — requires an external 10μF bypass capacitor (while under V 6 OUT operation. Thermal T Thermal Pad is for heat sinking purposes — connect to ground using multiple vias — not connected internally. Pad PRELIMINARY SC120 bias) for normal OUT 11 ...
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... Oscillator and Slope Generator Output Voltage FB 5 Selection Logic V OUT Comp Start-up Oscillator Slope Comp. PWM Comp. + PWM Control - Error Amp REF + - 1.2 V PRELIMINARY SC120 LIM Amp. Gate Drive Bulk and Bias Logic Control LIM Amplifier + - Current Amplifier 2 OUT LX GND 12 ...
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... Output Voltage Selection The SC120 output voltage can be programmed to an internally preset value or it can be programmed with external resistors. The output is internally programmed to 3.3V when the FB pin is connected to GND. Any output voltage in the range 1 ...
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... FETs turn off for the remainder of the off -state. If this dis- continuous mode (DM) operation persists, the SC120 transitions to PSAVE operation. PSAVE Operation At light loads, the SC120 will operate in PSAVE mode. PSAVE mode ensures proper regulation when V close to V while the output load is too small to keep the OUT duty cycle above its minimum value ...
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... FB pin network. If using external feedback programming prudent to add a small capaci- tor between OUT and FB to the circuit board layout. When operating the SC120 in the fi nal confi guration in PSAVE, observe the amplitude of PSAVE ripple. If the ripple exceeds 50mV for the expected range of input voltage, a small-value capacitor should be tried ...
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... Regulator Startup, Short Circuit Protection, and Current Limits The SC120 permits power up at input voltages from 0.85V to 3.8V. Startup current limiting of the internal switching n-channel and p-channel FET power devices protects them from damage in the event of a short between OUT and GND ...
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... This is the output load below which the boundary between continuous mode L-min and discontinuous mode PWM regulation, which signals the SC120 controller to switch to PSAVE operation. In the extreme case of V approaching V IN can also reduce the PSAVE inductor burst-envelope current ripple and voltage ripple ...
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... Low-ESR tantalum capacitors are not rec- ommended due to possible reduction in capacitance seen at the switching frequency of the SC120. Ceramic capaci- tors of type Y5V are not recommended as their tempera- ture coeffi cients make them unsuitable for this application. ...
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... LX node and the ground plane. • Use a ground plane with several vias connecting to the component side ground to further reduce noise interference on sensitive circuit nodes. 6.7mm C LX SC120 GND PRELIMINARY V OUT OUT OUT R 1 5.2mm layer SC120 19 ...
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... INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM - - A .020 .024 0. .000 .002 0.00 A2 (.006) (.152) b .007 .010 .012 0.18 0.25 D .055 .059 .063 1.40 1. .035 .055 0.90 E .075 .079 .083 1.90 2.00 E1 .026 .031 .035 0.65 0.80 e .020 BSC 0.50 BSC L .012 .014 .016 0.30 0. aaa .003 0.08 bbb .004 0.10 SC120 MAX 0.60 0.05 0.30 1.60 1.40 2.10 0.90 0.40 20 ...
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... Contact Information DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com PRELIMINARY SC120 DIMENSIONS INCHES MILLIMETERS (.077) (1.95) .047 1.20 .051 1.30 .031 0.80 .020 0.50 .006 0.15 .012 0.30 .030 0.75 .106 2 ...