MAX1710EEG Maxim Integrated Products, MAX1710EEG Datasheet
MAX1710EEG
Specifications of MAX1710EEG
Available stocks
Related parts for MAX1710EEG
MAX1710EEG Summary of contents
Page 1
... Switching Frequency o Remote GND and V o Over/Undervoltage Protection o 1.7ms Digital Soft-Start o Drive Large Synchronous-Rectifier FETs o 2V ±1% Reference Output o Power-Good Indicator o Small 24-Pin QSOP Package PART MAX1710EEG MAX1711EEG . The MAX1711 is +5V INPUT Applications Converters INPUTS *MAX1710 ONLY **MAX1711/MAX1712 ONLY Features ...
Page 2
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +30V GND .....................................................-0. PGND to GND.....................................................................±0.3V SHDN, PGOOD to GND ...........................................-0.3V to +6V OVP, ILIM, FB, ...
Page 3
Step-Down Controllers for Notebook CPUs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V BATT CC PARAMETER With respect to unloaded output voltage (MAX1710) Overvoltage Trip Threshold (MAX1711/MAX1712) Overvoltage Fault Propagation FB forced 2% above trip ...
Page 4
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V BATT CC PARAMETER TON V Level TON logic input high level CC TON Float Voltage TON logic input upper-midrange ...
Page 5
Step-Down Controllers for Notebook CPUs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V BATT CC PARAMETER Measured at FB with respect to unloaded output voltage, PGOOD Trip Threshold falling edge, hysteresis = 1% PGOOD Output ...
Page 6
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs _____________________________Typical Operating Characteristics (continued) (7A CPU supply circuit of Figure +25°C, unless otherwise noted.) A FREQUENCY vs. TEMPERATURE (V = 15V 2.0V 315 310 I ...
Page 7
Step-Down Controllers for Notebook CPUs _____________________________Typical Operating Characteristics (continued) (7A CPU supply circuit of Figure +25°C, unless otherwise noted.) A LOAD-TRANSIENT RESPONSE (WITH INTEGRATOR 10µs/div V = 15V 1.6V ...
Page 8
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs _____________________________Typical Operating Characteristics (continued) (7A CPU supply circuit of Figure +25°C, unless otherwise noted.) A OUTPUT OVERLOAD WAVEFORM 50µs/div V = 1.6V OUT ...
Page 9
Step-Down Controllers for Notebook CPUs PIN NAME 10 GND Analog Ground Ground Remote-Sense Input, normally connected to ground directly at the load. GNDS internally con- 11 GNDS nects to the integrator that fine tunes the ground offset voltage. 12 PGOOD ...
Page 10
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs V BATT 4.5V TO 28V + BIAS SUPPLY 1µF 20Ω ON/OFF 2 CONTROL SHDN 21 LOW-NOISE SKIP CONTROL 20 D0 MAX1710 MAX1711 19 D1 MAX1712 ...
Page 11
Step-Down Controllers for Notebook CPUs 28V BATT V+ TON ON-TIME FROM D/A COMPUTE TON TON Q TRIG 1-SHOT OVP SKIP REF SHDN 70k GNDS FB FBS REF +12% REF -5% ...
Page 12
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs Table 1. MAX1710 FB Output Voltage DAC Codes ...
Page 13
Step-Down Controllers for Notebook CPUs Table 3. MAX1712 FB Output Voltage DAC Codes (VRM 9. ...
Page 14
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs ∆ BATT OUT = ∆ ON-TIME TIME Figure 3. Pulse-Skipping/Discontinuous Crossover Point voltage rises approximately 1% (up to 1/2 the peak amplitude of the ripple waveform as ...
Page 15
Step-Down Controllers for Notebook CPUs tor ripple current. Therefore the exact current-limit char- acteristic and maximum load capability are a function of the MOSFET on-resistance, inductor value, and battery voltage. The reward for this uncertainty is robust, loss- less overcurrent ...
Page 16
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs Table 4. Operating Mode Truth Table SHDN SKIP OVP High Shutdown1 Low Shutdown2 Shutdown3 Low (MAX1711/ MAX1712) Below 1 X Switching No ...
Page 17
Step-Down Controllers for Notebook CPUs open-drain type with no parasitic ESD diodes. Note that the PGOOD undervoltage detector is completely inde- pendent of the output UVP fault detector. Output Overvoltage Protection (OVP) The OVP circuit is designed to protect against ...
Page 18
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs voltage, due to MOSFET switching losses that are proportional to frequency and VBATT frequency is also a moving target, due to rapid improvements in MOSFET technology that are making higher frequencies more ...
Page 19
Step-Down Controllers for Notebook CPUs The actual microfarad capacitance value required relates to the physical size needed to achieve low ESR, as well as to the chemistry of the capacitor technology. Thus, the capacitor is usually selected by ESR and ...
Page 20
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs 24V* IN ON/OFF DAC INPUTS 0.22µF 470pF *FOR HIGHER MINIMUM INPUT VOLTAGE, *LESS OUTPUT CAPACITANCE IS REQUIRED. Figure 7. All-Ceramic-Capacitor Application Table 6. Approximate K-Factors Errors TON K ...
Page 21
Step-Down Controllers for Notebook CPUs fy factors that influence the turn-on and turn-off times. These factors include the internal gate resistance, gate charge, threshold voltage, source inductance, and PC board layout characteristics. The following switching loss calculation provides only a ...
Page 22
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs minimize the energy transferred from inductor to capaci- tor during load-step recovery. Even so, the amount of overshoot is high enough (80mV) that for the MAX1710, it’s wise to disable OVP or ...
Page 23
Step-Down Controllers for Notebook CPUs ON/OFF D/A INPUTS 0.22µF V 100k *MAX1710 ONLY **MAX1711 ONLY Figure 9. 5V-Powered, 7A CPU Buck Regulator DAC code from the transitory value. Use 100ns maxi- mum rise and fall times. Selecting the output capacitors ...
Page 24
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs V BATT 10V TO 22V 0.1µF 0.22µF 470pF ON/OFF LSB DAC INPUTS MSB Figure 10.15A Dynamically Adjustable Notebook CPU Supply with Battery-Surge Current Limiting 24 ______________________________________________________________________________________ +5V INPUT 1µF 20Ω ...
Page 25
Step-Down Controllers for Notebook CPUs ALL ANALOG GROUNDS CONNECT TO GND ONLY. MAX1710 MAX1711 MAX1712 REF LIM GND VIA TO SOURCE CONNECT GND TO PGND BENEATH IC, 1 POINT ONLY. SPLIT ANALOG GND PLANE ...
Page 26
High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs • Keep the high-current paths short, especially at the ground terminals. This practice is essential for stable, jitter-free operation. • Connect GND and PGND together close to the IC. Carefully follow the ...
Page 27
Step-Down Controllers for Notebook CPUs TOP VIEW SHDN FBS 4 21 MAX1710 ILIM TON 8 17 REF 9 16 GND 10 15 GNDS ...
Page 28
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...