ISL6326CRZ-T Intersil, ISL6326CRZ-T Datasheet
ISL6326CRZ-T
Specifications of ISL6326CRZ-T
Available stocks
Related parts for ISL6326CRZ-T
ISL6326CRZ-T Summary of contents
Page 1
... Ordering Information PART NUMBER PART (Note) MARKING ISL6326CRZ* ISL6326CRZ ISL6326IRZ* ISL6326IRZ - 6x6 QFN L40.6x6 *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach ...
Page 2
Pinout VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OFS DAC 2 ISL6326 ISL6326 (40 LD QFN) TOP VIEW GND ...
Page 3
ISL6326CR Block Diagram VDIFF RGND - X1 + VSEN SOFT-START + OVP - FAULT LOGIC +175mV SS VRSEL VID7 VID6 VID5 DYNAMIC VID4 VID VID3 D/A VID2 VID1 VID0 DAC OFS OFFSET REF FB COMP IDROOP VR_HOT THERMAL MONITOR VR_FAN ...
Page 4
Typical Application - 4-Phase Buck Converter with External Temperature Compensation THERMISTOR NTC +5V °C COMP VCC FB IDROOP VDIFF VSEN PWM1 RGND ISEN1- EN_VTT VTT ISEN1+ VR_RDY VID7 ISL6326 VID6 VID5 VID4 VID3 PWM2 VID2 ISEN2- VID1 ISEN2+ VID0 VRSEL ...
Page 5
Typical Application - 4-Phase Buck Converter with Integrated Temperature Compensation +5V COMP VCC FB IDROOP VDIFF VSEN RGND ISEN1+ EN_VTT VTT ISEN1- VR_RDY VID7 VID6 VID5 ISL6326 VID4 VID3 VID2 ISEN3- VID1 ISEN3+ VID0 VRSEL ISEN2+ VR_FAN ISEN2- VR_HOT VIN ...
Page 6
... Operating Conditions Supply Voltage, (VCC +5V ±5% Ambient Temperature ISL6326CRZ 0°C to +70°C ISL6326IRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. ...
Page 7
Electrical Specifications Operating Conditions: VCC = 5V, Unless Otherwise Specified. (Continued) PARAMETER VRSEL Input High Level DAC Source Current DAC Sink Current REF Source Current REF Sink Current PIN-ADJUSTABLE OFFSET Voltage at OFS Pin OSCILLATORS Accuracy of Switching Frequency Setting ...
Page 8
Electrical Specifications Operating Conditions: VCC = 5V, Unless Otherwise Specified. (Continued) PARAMETER VR_FAN Low Voltage Leakage Current of VR_HOT VR_HOT Low Voltage VR READY AND PROTECTION MONITORS Leakage Current of VR_RDY VR_RDY Low Voltage Undervoltage Threshold VR_RDY Reset Voltage Overvoltage ...
Page 9
... PWM1, PWM2, PWM3, PWM4 Pulse width modulation outputs. Connect these pins to the PWM input pins of the Intersil driver IC. The number of active channels is determined by the state of PWM3 and PWM4. Tie PWM3 to VCC to configure for 2-phase operation. Tie PWM4 to VCC to configure for 3-phase operation. ISEN1+, ISEN1- ...
Page 10
Therefore, the sense current is proportional to the inductor current, and scaled by the DCR of the inductor and R . ISEN To match the time delay of the internal circuit, a capacitor is needed between each ISEN+ ...
Page 11
... Figure 21 shows the single phase input-capacitor RMS current for comparison. PWM Modulation Scheme The ISL6326 adopts Intersil's proprietary Active Pulse Positioning (APP) modulation scheme to improve transient performance. APP control is a unique dual-edge PWM modulation scheme with both PWM leading and trailing edges being independently moved to give the best response to transient loads ...
Page 12
FS pin and ground. The PWM signals command the MOSFET driver to turn on/off the channel MOSFETs. For 4-channel operation, the channel firing order is 4-3-2-1: PWM3 pulse happens 1 cycle after PWM4, ...
Page 13
... Channel current balance is achieved by comparing the sensed current of each channel to the average current to make an appropriate adjustment to the PWM duty cycle of each channel with Intersil’s patented current-balance method. Channel current balance is essential in achieving the thermal advantage of multiphase operation. With good ...
Page 14
External pull-up resistors can augment the pull-up current sources if case leakage into the driving device is greater than 45µA. TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) ...
Page 15
TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) VID4 VID3 VID2 VID1 VID0 VID5 400mV 200mV 100mV 50mV 25mV 12.5mV ...
Page 16
TABLE 2. VR11 VID 8-BIT (Continued) VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE ...
Page 17
TABLE 2. VR11 VID 8-BIT (Continued) VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE ...
Page 18
Load-Line Regulation Some microprocessor manufacturers require a precisely-controlled output resistance. This dependence of output voltage on load current is often termed “droop” or “load line” regulation. By adding a well controlled output impedance, the output voltage can effectively be level ...
Page 19
... ICs reach their POR level before the ISL6326 becomes enabled. The schematic in Figure 7 demonstrates sequencing the ISL6326 with the ISL66xx 19 ISL6326 family of Intersil MOSFET drivers, which require 12V bias. 3. The voltage on EN_VTT must be higher than 0.875V to enable the controller. This pin is typically connected to the output of VTT VR. ...
Page 20
... This causes the . The d5 Intersil drivers to turn on the lower MOSFETs and pull the output voltage below a level to avoid damaging the load. When the VDIFF voltage falls below the DAC + 75mV, PWM signals enter a high-impedance state. The Intersil drivers respond to the high-impedance input by turning off both upper and lower MOSFETs ...
Page 21
... At the beginning of overcurrent shutdown, the controller places all PWM signals in a high-impedance state within 20ns, commanding the Intersil MOSFET driver ICs to turn off both upper and lower MOSFETs. The system remains in this state a period of 4096 switching cycles. If the controller is still enabled at the end of this wait period, it will attempt a soft-start ...
Page 22
TEMPERATURE TM CC 100 TEMPERATURE (°C) FIGURE 12. THE RATIO OF TM VOLTAGE TO NTC TEMPERATURE WITH RECOMMENDED PARTS TM 0.39*V CC 0.33*V CC ...
Page 23
TCOMP voltage can also be used to compensate for the difference between the recommended TM voltage curve in Figure 13 and that of the actual design. According to the VCC voltage, ISL6326 converts the TCOMP pin voltage to a 4-bit ...
Page 24
... It is assumed that the reader is familiar with many of the basic skills and techniques referenced in the following sections. In addition to this guide, Intersil provides complete reference designs that include schematics, bills of materials, and example board layouts for all common microprocessor applications ...
Page 25
MOSFET across VIN. The power dissipated as a result Finally, the resistive part of the upper MOSFET’s is given in Equation 29 ...
Page 26
COMPENSATING LOAD-LINE REGULATED CONVERTER The load-line regulated converter behaves in a similar manner to a peak-current mode controller because the two poles at the output-filter L-C resonant frequency split with the introduction of current information into the control loop. The ...
Page 27
COMP IDROOP VDIFF FIGURE 17. COMPENSATION CIRCUIT FOR ISL6326 BASED CONVERTER WITHOUT LOAD-LINE REGULATION The first step is to choose the desired bandwidth, f compensated system. Choose ...
Page 28
V V – ⎝ ⎠ IN OUT OUT ( ) ≥ L ESR ----------------------------------------------------------- - P-P MAX Since the capacitors are supplying a decreasing portion of the load ...
Page 29
... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...
Page 30
Package Outline Drawing L40.6x6 40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 3, 10/06 6.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 30 ...