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UCC3941D-ADJ Datasheet(PDF) 7 Page - Texas Instruments |
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UCC3941D-ADJ Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page UCC2941-3, UCC2941-5, UCC2941-ADJ, UCC3941-3, UCC3941-5, UCC3941-ADJ 1V SYNCHRONOUS BOOST CONVERTER SLUS242B – JANUARY 1999 – REVISED JUNE 2001 7 www.ti.com APPLICATION INFORMATION A detailed block diagram of the UCC3941 is shown in Figure 1. Unique control circuitry provides high-efficiency power conversion for both light and heavy loads by transitioning between discontinuous and continuous conduction based on load conditions. Figure 2 depicts converter waveforms for the application circuit shown in Figure 3. A single 22- µH inductor provides the energy pulses required for a highly efficient 3.3-V converter at up to 500 mW output power. UDG–98146 4 5 2 3 8 1 6 6 7 SD PLIM VGD VIN SW VOUT FB (UCC3941–ADJ ONLY) PGND SGND (UCC3941–3/–5 ONLY) 5 Ω VGD * 3.3 V FOR UCC3941–3 5.0 V FOR UCC3941–5 1.25 V FOR UCC3941–ADJ VGD ** 8.7 V FOR UCC3941–3 9.6 V FOR UCC3941–5/–ADJ VGD *** 7.7 V FOR UCC3941–3 8.8 V FOR UCC3941–5/–ADJ FROM SD 5V 1.1 A MAX CURRENT LIMIT 50 mV VIN VIN SD 50 mV MAXIMUM 200 kHz STARTUP OSCILLATOR AND CONTROL VGD VGD VGD ZERO DETECT VOUT ZERO DETECT ANTI–RINGING SWITCH 1.7 µS OFF TIME CONTROLLER RECTIFIER CONTROL FROM SD CLK DQ L1 RQ SD BOOST LATCH ON TIME CONTROLLER T ON= 11 µSEC VIN VSAT * ** *** THERMAL SHUTDOWN R Q SD + + + + + + + NOTE: Switches are shown in the logic low state; external RPLIM = 6.2 Ω Figure 1. 1–V Synchronous Boost |
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