ISL65426 Industrial & Communication Product Line Company Confidential
Intersil’s Integrated FET Value Proposition • High level of integration – Internal MOSFETs (synchronous buck regulators) – Some include PGood (power OK) function – Newer generation devices include up to three outputs • Various switching frequency choices – Up to 1.5MHz for smaller BOM components – Programmable down to 200kHz for high efficiency (up to 95%) • Various output current choices – 600mA to 6A - can support several applications • Additional features – OC, UVLO and temperature shutdown protection features – External SYNC function – Voltage tracking and sequencing capability • Various package options – QFN, HTSSOP, MSOP, DFN Page 2 Company Confidential
ISL65426: Typical Applications • Digital Voltmeters • Oscilloscopes • POL Modules • GPS Navigators • Barcode Scanners • FPGA/CPLD Power Solutions • Portable Test Equipment • Learning Language • Portable Medical Devices Machine • Two-way Radios • Integrated Gear Motors • SFP (Networking) • Copy Machines • Spectrum Analyzers • Server Blades Page 3 Company Confidential
Selling Points • “One-chip” power solution vs discrete solution – The flexible dual output architecture can support multi-rail power requirements with one IC • Provides a cost-effective and compact solution as opposed to using discrete solutions for each output rail • Complete programmability of output power – Service all your current requirements (up to 6A) with one IC • Option of using a single part across the board for different current requirements – Supports all the output voltage requirements with a single IC • High switching frequency and high efficiency – Smaller external BOM components • Current mode control – Provides better transient response Page 4 Company Confidential
ISL65426: 6A Dual Synchronous Regulator • V IN 2.375V to 5.5V – 6A combined I OUT • PWM fixed and adjustable output voltage options – PWM1: 1.8V, 1.5V, 1.2V or 0.6V – PWM2: 3.3V (V IN =5V), 2.5V, 1.8V or 0.6V • Key features – User-partitioned power blocks – 180° out-of-phase operation – Startup in a pre-biased load – Independent output Soft-start and enable – Stable all-ceramic solutions – High efficiency: 95% – ±1% system accuracy over temperature • Package: 5x10 QFN Page 5 Company Confidential
Configuring the ISL65426 EN2 EN VCC GND EN1 ISL65426 Features: POWER-ON RESET (POR) PVINx Programmable Output Voltage • 0.9V, 1.2V, 1.5V, and 1.8V PVINx • 0.9V, 1.8V, 2.5V, and 3.3V CURRENT SENSE SLOPE SOFT START COMPENSATION PWM CONTROL GATE LXx Parallel the LX’s for: EA GM FB1 LOGIC DRIVE 2A:4A, 3A:3A, 4A:2A, 5A:1A V1SET1 OUTPUT COMPENSATION VOLTAGE V1SET2 CONFIG EPAD GND UV PGOOD1 POWER GOOD Internal Current Mode POWER ISET1 SOFT DEVICE START ISET2 CONFIG Compensation THERMAL PWM REFERENCE MONITOR 0.60V PVINx POR Independent Power Good CURRENT SENSE SLOPE SOFT COMPENSATION START PWM CONTROL GATE LXx EA GM FB2 DRIVE LOGIC V2SET1 OUTPUT 180° Out-of-Phase VOLTAGE COMPENSATION CONFIG V2SET2 EPAD GND Current Mode Control OV UV POWER GOOD PGOOD2 Page 6 Company Confidential
Configuring the Output Voltage and Current V 1SET2 V 1SET1 Channel 1 V 2SET2 V 2SET1 Channel 2 V OUT V OUT low low 0.6V low low 0.6V Output Voltage Configurations low high 1.2V low high 1.8V high low 1.5V high low 2.5V high high 1.8V high high 3.3V I 1SET I 2SET I OUT1 Channel 1 I OUT2 Channel 2 Connections Connections 1 1 3A LX1, LX2, LX3 3A LX4, LX5, LX6 1 0 4A LX1, LX2, LX3, 2A LX5, LX6 LX4 0 1 5A LX1, LX2, LX3, 1A LX5 Output Current Configurations LX4, LX6 0 0 2A LX1, LX2 4A LX3, LX4, LX5, LX6 Invalid LX Configurations: SS Prevented x x 1A LX2 5A LX1, LX3, LX4, LX5, LX6 Page 7 Company Confidential
Voltage Monitoring and Supply Sequencing Separate Enable and PGOOD signals allows individual control and monitoring Page 8 Company Confidential
Typical Circuit Dual Input Supply 4A:2A Configuration 3.3V PG1 PG2 5.0V Low EN1 EN2 EN component count!!! PVIN1 PVIN6 PVIN2 3.3V 5.0V PVIN3 PVIN5 10 µ F C4 10 µ F C1 PVIN4 L X 6 L2 L X 5 1.8V ISL65426 1.0 µ H 2A C3 µ F 100 L X 1 L X 2 FB2 L1 0.6 µ H L X 3 4A C2 V C C L X 4 200 µ F 5.0V C5 FB1 0.1 µ F GND PGND V2SET1 V 1SET1 V2SET2 IS ET1 V1S ET2 ISET2 5.0V Page 9 Company Confidential
High Efficiency – System Runs Cooler EFFICIENCY VS LOAD 1MHz VOUT1=1.8V ISL65426 100.00% 90.00% 80.00% 70.00% 60.00% Efficency (%) 50.00% 40.00% 30.00% 2.5Vin 20.00% 3.3 Vin 10.00% 5.5Vin 0.00% 0.000 1.000 2.000 3.000 4.000 Output Load (A) Low Vin=2.5V, Nominal Vin=3.3V, High Vin=5.5V Page 10 Company Confidential
High Efficiency – System Runs Cooler EFFICIENCY VS LOAD 1MHz VOUT2=3.3V ISL65426 100.00% 90.00% 80.00% 70.00% 60.00% Efficency (%) 50.00% 40.00% 30.00% 4.5Vin 20.00% 5Vin 10.00% 5.5Vin 0.00% 0.000 1.000 2.000 3.000 Output Load (A) Low Vin=4.5V, Nominal Vin=5V, High Vin=5.5V Page 11 Company Confidential
Startup with Pre-Biased Output Figure 1-18. Start-up VOUT1 w/Pre-biased using EN. 1. EN1 2. VOUT1 Pre-biased at 1.4V 3. 4. PHASE1, M1-Zoom-in of the PHASE1 Test Conditions: Vin=5V, VOUT1=1.80V:0A EN1=1 There are 64 digital soft-start steps. Once in regulation, IC operates in CCM. Page 12 Company Confidential
Output Ripple – 1.8V and 3.3V Output 1. PHASE1 180° Out-of-Phase 2. OUT1 Ripple 3. PHASE2 4. OUT2 Ripple Test Conditions: Vin=5.5V, VOUT1=1.8V: 4A VOUT2=3.3V: 2A EN1=1 ; EN2=1 V1SET1=1; V1SET2=1 V2SET1=1; V2SET2=1 The 180° Out-of-Phase Operation of the two regulators reduce Output Ripple and EMI Page 13 Company Confidential
Output Regulation Output Regulation vs Load Current Output Regulation vs Input Voltage Page 14 Company Confidential
Powering an FPGA/CPLD with ISL65426 Core Voltage V IN PWM Output 1 ISL65426 I/O Voltage PWM Output 2 FPGA V IN Auxiliary Voltage PWM Output 1 ISL65426 Reset V REF PWM Output 2 Supervisor Reference DDR Memory Page 15 Company Confidential
Tools and Links • Parametric Tables www.intersil.com/products/pt/parametric_table_510.asp – Complete parametric data for all devices – sort, download, search with parameters you define • Samples www.intersil.com/samples – Order directly from our website or through your local sales rep • Online Cross Reference www.intersil.com/products/xref/index.asp – Competitors’ devices are crossed to help you find the right replacement • Block Diagrams www.intersil.com/applications – Integrated FETs can be found in many applications – find them in these design solutions • Engineering Support www.intersil.com/design – Applications support, online FAQs, design models, document library Page 16 Company Confidential
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