|Category||Power Management => PWM Power Supply => Buck Mode|
|Description||Microprocessor Core Voltage Regulator Multi-phase Buck PWM Controller|
|Datasheet||Download HIP6302 datasheet
Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
The HIP6302 multi-phase PWM control IC together with its companion gate drivers, the or HIP6603 and Intersil MOSFETs provides a precision voltage regulation system for advanced microprocessors. Multiphase power conversion is a marked departure from earlier single phase converter configurations previously employed to satisfy the ever increasing current demands of modern microprocessors. Multi-phase convertors, by distributing the power and load current results in smaller and lower cost transistors with fewer input and output capacitors. These reductions accrue from the higher effective conversion frequency with higher frequency ripple current due to the phase interleaving process of this topology. For example, a two phase convertor operating at 350kHz will have a ripple frequency of 700kHz. Moreover, greater convertor bandwidth of this design results in faster response to load transients. Outstanding features of this controller IC include programmable VID codes from the microprocessor that range from to 1.850V with a system accuracy of ±1%. Pull up currents on these VID pins eliminates the need for external pull up resistors. In addition "droop" compensation, used to reduce the overshoot or undershoot of the CORE voltage, is easily programmed with a single resistor. Another feature of this controller IC is the PGOOD monitor circuit which is held low until the CORE voltage increases, during its Soft-Start sequence, to within 10% of the programmed voltage. Over-voltage, 15% above programmed CORE voltage, results in the converter shutting down and turning the lower MOSFETs ON to clamp and protect the microprocessor. Under voltage is also detected and results in PGOOD low if the CORE voltage falls 10% below the programmed level. Over-current protection reduces the regulator current to less than 25% of the programmed trip value. These features provide monitoring and protection for the microprocessor and power system.Features
Multi-Phase Power Conversion Precision Channel Current Sharing - Loss Less Current Sampling - Uses rDS(ON) Precision CORE Voltage Regulation - ±1% System Accuracy Over Temperature Microprocessor Voltage Identification Input - 5-Bit VID Input in 25mV Steps - Programmable "Droop" Voltage Fast Transient Recovery Time Over Current Protection High Ripple Frequency, (Channel Frequency) Times Number Channels. to 3MHzPART NUMBER HIP6302CB-T HIP6302EVAL1 TEMP. (oC) to 70 PACKAGE 16 Ld SOIC PKG. NO. M16.15
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Copyright © Intersil Corporation 2000
POWER-ON RESET (POR) VSEN X 0.9 THREE STATE OV LATCH S + OVP X1.15 CLOCK AND SAWTOOTH GENERATOR FS/EN
Bias and reference ground. All signals are referenced to this pin.
Power good monitor input. Connect to the microprocessorCORE voltage.
Current sense inputs from the individual converter channel's phase nodes.
Voltage Identification inputs from microprocessor. These pins respond to TTL and 3.3V logic signals. The HIP6302 decodes VID bits to establish the output voltage. See Table 1. PWM outputs for each driven channel in use. Connect these pins to the PWM input a HIP6601/2/3 driver.
Power good. This pin provides a logic-high signal when the microprocessor CORE voltage (VSEN pin) is within specified limits and Soft-Start has timed out.
Output of the internal error amplifier. Connect this pin to the external feedback and compensation network.
Channel frequency, FSW, select and disable. A resistor from this pin to ground sets the switching frequency of the converter. Pulling this pin to ground disables the converter and three states the PWM outputs. See Figure 10.
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