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MAX8764ETP Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX8764ETP Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 23 page Detailed Description The MAX8764 buck controller is targeted for low-voltage power supplies for notebook computers. Maxim’s propri- etary Quick-PWM pulse-width modulator in the MAX8764 is specifically designed for handling fast load steps while maintaining a relatively constant operating frequency and inductor operating point over a wide range of input voltages. The Quick-PWM architecture circumvents the poor load-transient timing problems of fixed-frequency, current-mode PWMs while also avoiding the problems caused by widely varying switching frequencies in con- ventional constant-on-time and constant-off-time PWM schemes. 5V Bias Supply (VCC and VDD) The MAX8764 requires an external 5V bias supply in addition to the battery. Typically, this 5V bias supply is the notebook’s 95% efficient 5V system supply. Keeping the bias supply external to the IC improves efficiency and eliminates the cost associated with the 5V linear reg- ulator that would otherwise be needed to supply the PWM circuit and gate drivers. If stand-alone capability is needed, the 5V supply can be generated with an exter- nal linear regulator such as the MAX1615. The battery and 5V bias inputs can be connected together if the input source is a fixed 4.5V to 5.5V supply. If the 5V bias supply is powered up prior to the High-Speed, Step-Down Controller with Accurate Current Limit for Notebook Computers 10 ______________________________________________________________________________________ VCC UVP VIN 7V TO 20V 5V BIAS SUPPLY C2 330 µF SEE TABLE 1 FOR OTHER COMPONENT SELECTIONS. POWER-GOOD INDICATOR L1 4.7 µH VOUT 2.5V SHDN V+ D2 CMPSH-3 C6 3.3 µF C7 0.1 µF C4 0.22 µF 270k Ω 130k Ω Q1 D1 R2 100k Ω Q2 RSENSE 15m Ω C5 4.7 µF R1 20 Ω SKIP ILIM ON/OFF CONTROL LOW-NOISE CONTROL DL LX BST DH CS OUT FB LATCH OVP PGOOD VDD MAX8764 5V TON REF GND C1 10 µF Figure 1. Standard Application Circuit |
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