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APW7058KC-TRL Datasheet(PDF) 1 Page - Anpec Electronics Coropration |
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APW7058KC-TRL Datasheet(HTML) 1 Page - Anpec Electronics Coropration |
1 / 13 page Copyright ANPEC Electronics Corp. Rev. A.3 - Mar., 2005 APW7058 www.anpec.com.tw 1 ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Synchronous Buck PWM and Linear Controllers ••••• Provides Two Regulated Voltages - One Synchronous-Rectified Buck PWM Controller - One Linear Controller ••••• Low Reference Voltage for Further Applications - Both Controllers : 0.8V ± 2% Over Temperature ••••• Both Controllers Drive N-Channel MOSFETs - PWM Controller Drives Dual N-Channel MOSFETs - Linear Controller Drives N-Channel MOSFET ••••• Built-in PWM Feedback Compensation - No Steady-State Error - Voltage-Mode PWM Control - Full 0~100% Duty Ratio - Fast Transient Response ••••• Adjustable Outputs by External Resistor Dividers ••••• Under-Voltage Monitoring on Both Controllers ••••• Small Converter Size - 600kHz Constant Switching Frequency - Built-In Soft-Start - Simple SO-8 Package ••••• Shutdown Control ••••• Lead Free Available (RoHS Compliant) Features Applications ••••• Motherboard ••••• Graphics Cards ••••• 12V, 5V and 3.3V Inputs DC-DC Converter General Description The APW7058 integrates one synchronous-rectified Buck PWM controller and one linear controller to pro- vide two regulated voltages for graphics cards and other embedded processor applications. The PWM controller which drives dual N-channel MOSFETs uses fixed 600kHz frequency, voltage-mode PWM control and integrates power-on-reset(POR), built-in soft-start, output under-voltage monitoring and shutdown func- tions into a single chip. The linear controller which drives a N-channel MOSFET bypass transistor allows users to optimize the transient response by external components. The POR circuit with hysteresis moni- tors both 5VCC and 12VCC supply voltages to start up/shutdown the IC at power-on/off. An internal 0.8V temperature-compensated reference is designed to meet the low output voltage requirement for further applications. The built-in soft-start function sets the soft-start interval to prevent the output voltages from overshoot as well as limiting the input currents. The under-voltage protections monitor the voltages at FB and FB2 for short-circuit protection. The under-volt- age protections cycle the soft-start function until 3 times of UVP events are happened. Pulling and hold- ing the FB2 pin above 1.28V to disable the both controllers. Pin Description 1 2 3 45 6 7 8 12VCC UGATE GND LGATE 5VCC DRIVE2 FB2 FB |
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