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Part: ISL6553EVAL1
Category:
Power Management
-> Desktop
Description: 2 Phase Synchronous Buck Controllerpwm Buck
Company: Intersil Corporation
Datasheet: Download ISL6553EVAL1 datasheet File size : 476 kB
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Datasheet text preview:
ISL6553
TM
D a ta Sheet
Nov e m b e r 2000
F i l e Number
4931
Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
The ISL6553 multi-phase PWM control IC together with its companion gate drivers, the HIP6601, HIP6602 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 converters, 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 converter operating at 350kHz will have a ripple frequency of 700kHz. Moreover, greater converter 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 1.05V to 1.825V 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 RMS output current to 41% of the programmed over-current 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 - 1.05V to 1.825V in 25mV Steps - Programmable "Droop" Voltage · Fast Transient Recovery Time · Over Current Protection · High Ripple Frequency, (Channel Frequency) Times Number Channels . . . . . . . . . . . . . . . . . 100kHz to 3MHz
Related Literature
· Technical Brief TB363 "Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)"
Ordering Information
PART NUMBER ISL6553CB ISL6553CB-T ISL6553EVAL1 TEMP. (oC) 0 to 70 PACKAGE 16 Ld SOIC PKG. NO. M16.15
16 Ld SOIC Tape and Reel Evaluation Platform
Pinout
ISL6553 (SOIC) TOP VIEW
VID3 1 VID2 2 VID1 3 VID0 4 VID25mV 5 COMP 6 FB 7 FS/DIS 8 16 VCC 15 PGOOD 14 ISEN1 13 PWM1 12 PWM2 11 ISEN2 10 VSEN 9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000
ISL6553 Block Diagram
PGOOD VCC
POWER-ON RESET (POR) VSEN + UV X 0.9 THREE STATE
S + OVP
OV LATCH CLOCK AND SAWTOOTH GENERATOR FS/EN
X1.15
-
SOFTSTART AND FAULT LOGIC COMP
+
+
-
PWM
PWM1
VID3 VID2 VID1 VID0 VID25mV FB I_TOT D/A + E/A
+
-
+ PWM
-
PWM2
CURRENT CORRECTION
+ OC
I_TRIP
+
ISEN1 ISEN2
+
-
GND
Simplified Power System Diagram
VSEN
PWM 1
SYNCHRONOUS RECTIFIED BUCK CHANNEL MICROPROCESSOR
ISL6553 PWM 2 SYNCHRONOUS RECTIFIED BUCK CHANNEL
VID
2
ISL6553 Functional Pin Description
VID3 1 VID2 2 VID1 3 VID0 4 VID25mV 5 COMP 6 FB 7 FS/DIS 8 16 VCC 15 PGOOD 14 ISEN1 13 PWM1 12 PWM2 11 ISEN2 10 VSEN 9 GND
Channel frequency, FSW, select and disable. A resistor from this pin to ground sets the switching frequency of the conver ter. Pulling this pin to ground disables the converter and three states the PWM outputs. See Figure 10.
GND (Pin 9)
Bias and reference ground. All signals are referenced to this pin.
VSEN (Pin 10)
Power good monitor input. Connect to the microprocessorCORE voltage.
ISEN2 (Pin 11) and ISEN1 (Pin 14) VID3 (Pin 1), VID2 (Pin 2), VID1 (Pin 3), VID0 (Pin 4) and VID25mV (Pin 5)
Voltage Identification inputs from microprocessor. These pins respond to TTL and 3.3V logic signals. The ISL6553 decodes VID bits to establish the output voltage. See Table 1. Current sense inputs from the individual conver ter channel's phase nodes.
PWM2 (Pin 12) and PWM1 (Pin 13)
PWM outputs for each driven channel in use. Connect these pins to the PWM input of a HIP6601/2/3 driver.
COMP (Pin 6)
Output of the internal error amplifier. Connect this pin to the external feedback and compensation network.
PGOOD (Pin 15)
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.
FB (Pin 7)
Inver ting input of the internal error amplifier.
VCC (Pin 16)
Bias supply. Connect this pin to a 5V supply.
FS/DIS (Pin 8)
Typical Application - Two Phase Converter Using HIP6601 Gate Drivers
+12V
BOOT UGATE VCC +5V PHASE VIN = +5V
PVCC
PWM
DRIVER HIP6601
LGATE GND
+VCORE
FB VSEN PGOOD VID3
COMP VCC PWM2
+12V
BOOT PVCC VIN = +5V
ISEN2 VID2 VID1 VID0 VID25mV FS/DIS GND ISEN1
UGATE VCC PHASE
MAIN CONTROL ISL6553
PWM1
PWM
DRIVER HIP6601
LGATE GND
3
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