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LM3670MFX-ADJ データシート(PDF) 10 Page - Texas Instruments |
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LM3670MFX-ADJ データシート(HTML) 10 Page - Texas Instruments |
10 / 28 page 1 MHz Oscillator Soft Start Ramp Generator + - Thermal Shutdown Undervoltage Lockout VREF + - 0.5V Error Amp Control Logic Driver Current Limit Comparator Ref1 PFM Current Comparator Ref2 SW Zero Crossing Comparator FB EN VIN PWM Comparator pfm_low pfm_hi GND Bandgap + - Vcomp 1.0V Frequency Compensation Adj Version Fixed Version 10 LM3670 SNVS250F – NOVEMBER 2004 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: LM3670 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM3670, a high-efficiency step-down DC-DC switching buck converter, delivers a constant voltage from either a single Li-Ion or three-cell NiMH/NiCd battery to portable devices such as cell phones and PDAs. Using a voltage mode architecture with synchronous rectification, the LM3670 can deliver up to 350 mA depending on the input voltage and output voltage (voltage head room), and the inductor chosen (maximum current capability). There are three modes of operation depending on the current required: pulse width modulation (PWM), pulse frequency modulation (PFM), and shutdown. PWM mode handles current loads of approximately 70 mA or higher. Lighter output current loads cause the device to automatically switch into PFM for reduced current consumption (IQ = 15 µA typical) and a longer battery life. Shutdown mode turns off the device, offering the lowest current consumption (ISHUTDOWN = 0.1 µA typical). The LM3670 can operate up to a 100% duty cycle (PMOS switch always on) for low dropout control of the output voltage. In this way the output voltage is controlled down to the lowest possible input voltage. Additional features include soft-start, undervoltage lockout, current overload protection, and thermal overload protection. As shown in Figure 17, only three external power components are required for implementation. 7.2 Functional Block Diagram |
同様の部品番号 - LM3670MFX-ADJ |
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同様の説明 - LM3670MFX-ADJ |
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