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MAX1711EEG Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1711EEG Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 28 page High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs 8 _______________________________________________________________________________________ 50 µs/div OUTPUT OVERLOAD WAVEFORM VOUT = 1.6V A = VIN, AC-COUPLED, 2V/div B = VOUT, 0.5V/div C = INDUCTOR CURRENT, 5A/div A B C 5 µs/div LOAD-TRANSIENT RESPONSE L = 0.7 µH, VOUT = 1.6V, VIN = 15V, COUT = 47µF (x4), f = 550kHz A = VOUT, AC-COUPLED, 100mV/div B = INDUCTOR CURRENT, 5A/div C = DL, 5V/div A B C CERAMIC COUT 5 µs/div SHUTDOWN WAVEFORM VIN = 15V, V0 = 1.6V, I0 = 7A A = VOUT, 0.5V/div B = INDUCTOR CURRENT, 5A/div C = SHDN, 2V/div D = DL, 5V/div A B C D _____________________________Typical Operating Characteristics (continued) (7A CPU supply circuit of Figure 1, TA = +25°C, unless otherwise noted.) Pin Description NAME FUNCTION 5 CC Integrator Capacitor Connection. Connect a 100pF to 1000pF (470pF typical) capacitor to GND to set the integration time constant. PIN 4 FBS Feedback Remote-Sense Input, normally connected to VOUT directly at the load. FBS internally connects to the integrator that fine tunes the DC output voltage. Tie FBS to VCC to disable all three integrator amplifiers. Tie FBS to FB (or disable the integrators) when externally adjusting the output voltage with a resistor-divider. 3 FB Fast Feedback Input, normally connected to VOUT. FB is connected to the bulk output filter capacitors local- ly at the power supply. An external resistor-divider can optionally set the output voltage. 8 TON On-Time Selection Control Input. This is a four-level input that sets the K factor to determine DH on-time. GND = 550kHz, REF = 400kHz, open = 300kHz, VCC = 200kHz. 7 VCC Analog Supply Voltage Input for PWM Core, 4.5V to 5.5V. Bypass VCC to GND with a 0.1µF minimum capacitor. 6 ILIM Current-Limit Threshold Adjustment. Connects to an external resistor to GND. The LX-PGND current-limit threshold defaults to +100mV if ILIM is tied to VCC. The current-limit threshold is 1/10 of the voltage forced at ILIM. In adjustable mode, the threshold is VTH = RLIM ✕ 5µA/10. 1 V+ Battery Voltage Sense Connection. V+ is used only for PWM one-shot timing. DH on-time is inversely propor- tional to V+ input voltage over a range of 2V to 28V. 9 REF 2.0V Reference Output. Bypass REF to GND with a 0.22µF minimum capacitor. REF can source 50µA for external loads. Loading REF degrades FB accuracy according to the REF load-regulation error (see Electrical Characteristics). 2 SHDN Shutdown Control Input, active low. SHDN cannot withstand the battery voltage. In shutdown mode, DL is forced to VDD in order to enforce overvoltage protection, even when powered down (unless OVP is high). |
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