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MAX796 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX796 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 32 page Step-Down Controllers with Synchronous Rectifier for CPU Power _______________________________________________________________________________________ 9 ______________________________________________________________Pin Description Current-Sense input, High side. Current-limit level is 100mV referred to CSL. CSH 8 Current-Sense input, Low side. Also serves as the feedback input in fixed-output modes. CSL 9 Battery voltage input (4.5V to 30V). Bypass V+ to PGND close to the IC with a 0.1µF capacitor. Connects to a linear regulator that powers VL. V+ 10 5V Internal linear-regulator output. VL is also the supply voltage rail for the chip. VL is switched to the output voltage via CSL (VCSL > 4.5V) for automatic bootstrapping. Bypass to GND with 4.7µF. VL can supply up to 5mA for external loads. VL 11 Power Ground. PGND 12 Low-noise analog Ground and feedback reference point. GND 4 Oscillator Synchronization and frequency select. Tie to GND or VL for 150kHz operation; tie to REF for 300kHz operation. A high-to-low transition begins a new cycle. Drive SYNC with 0V to 5V logic levels (see the Electrical Characteristics table for VIH and VIL specifications). SYNC capture range is 190kHz to 340kHz guaranteed. SYNC 5 Shutdown control input, active low. Logic threshold is set at approximately 1V (VTH of an internal N-channel MOSFET). Tie SHDN to V+ for automatic start-up. SHDN 6 Feedback input. Regulates at FB = REF (approximately 2.505V) in adjustable mode. FB is a Dual-ModeTM input that also selects the fixed output voltage settings as follows: • Connect to GND for 3.3V operation. • Connect to VL for 5V operation. • Connect FB to a resistor divider for adjustable mode. FB can be driven with +5V rail-to-rail logic in order to change the output voltage under system control. FB 7 Reference voltage output. Bypass to GND with 0.33µF minimum. REF 3 PIN Secondary winding Feedback input. Normally connected to a resistor divider from an auxiliary output. Don’t leave SECFB unconnected. • MAX796: SECFB regulates at VSECFB = 2.505V. Tie to VL if not used. • MAX799: SECFB regulates at VSECFB = 0V. Tie to a negative voltage through a high-value current-limit- ing resistor (IMAX = 100µA) if not used. SECFB (MAX796/ MAX799) 2 Soft-Start timing capacitor connection. Ramp time to full current limit is approximately 1ms/nF. SS 1 FUNCTION NAME Low-side gate-drive output. Normally drives the synchronous-rectifier MOSFET. Swings 0V to VL. DL 13 Boost capacitor connection for high-side gate drive (0.1µF). BST 14 Switching node (inductor) connection. Can swing 2V below ground without hazard. LX 15 High-side gate-drive output. Normally drives the main buck switch. DH is a floating driver output that swings from LX to BST, riding on the LX switching-node voltage. DH 16 Dual Mode is a trademark of Maxim Integrated Products. Disables pulse-skipping mode when high. Connect to GND for normal use. Don’t leave SKIP unconnected. With SKIP grounded, the device will automatically change from pulse-skipping operation to full PWM opera- tion when the load current exceeds approximately 30% of maximum. (See Table 3.) SKIP (MAX797) |
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Similar Description - MAX796 |
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