DATASHEET ISL6341, ISL6341A, ISL6341B, ISL6341C FN6538 Rev 2.00 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller Dec 2, 2008 The ISL6341, ISL6341A, ISL6341B, ISL6341C makes Features simple work out of implementing a complete control and Operates from +4.5V to 14.4V Supply Voltage (for Bias) protection scheme for a DC/DC stepdown converter driving - 1.5V to 12V V Input Range (Up to 20V is Possible with IN N-Channel MOSFETs in a synchronous buck topology. Since Restrictions see Input Voltage Considerations on it can work with either 5V or 12V supplies, this one family of page 12) ICs can be used in a wide variety of applications within a - 0.8V to ~V Output Range (Duty Cycle Limited) IN system. It integrates the control, gate drivers, output - Integrated Gate Drivers LGATE Uses V (5V to 12V) CC adjustment, monitoring and protection functions into a single UGATE Uses External Boot Diode to (5V to 12V) 10 Ld Thin DFN package. - 0.8V Internal Reference 0.8% Tolerance The ISL6341, ISL6341A, ISL6341B, ISL6341C (hereafter Simple Single-Loop Control Design referred to as ISL6341x, except as needed) provides single - Traditional Dual Edge Modulator feedback loop, voltage-mode control with fast transient - Voltage-Mode PWM Control response. The output voltage can be precisely regulated to as - Drives N-Channel MOSFETs low as 0.8V, with a maximum tolerance of 0.8% over-temperature and line voltage variations. A fixed frequency Fast Transient Response oscillator and wide duty cycle range reduces design complexity, - High-Bandwidth Error Amplifier while balancing typical application cost and efficiency. The - 0% to 85% Max Duty Cycle for ISL6341, ISL6341C frequency, duty cycle and OCP response are the only - 0% to 75% Max Duty Cycle for ISL6341A, ISL6341B differences among the ISL6341x versions. See Table 1. Lossless, Programmable Overcurrent Protection Protection from overcurrent conditions is provided by - Uses Lower MOSFETs r DS(ON) monitoring the r of the lower MOSFET to inhibit PWM DS(ON) - Latch off mode (ISL6341, ISL6341B) operation appropriately (see Overcurrent Protection (OCP) - Infinite Retry (Hiccup) Mode (ISL6341A) on page 8 for details). This approach simplifies the - Infinite Retry (Hiccup) Mode no UVP (ISL6341C) implementation and improves efficiency by eliminating the need for a current sense resistor. The output voltage is also Output Voltage Monitoring monitored for undervoltage and overvoltage protection, in - Undervoltage and Overvoltage Shutdown addition to monitoring for a PGOOD output. - PGOOD Output Ordering Information Small Converter Size in 10 Ld 3x3 Thin DFN PART NUMBER PART TEMP. PACKAGE PKG. - 300kHz Fixed Oscillator (ISL6341, ISL6341C) (Note) MARKING RANGE (C) (Pb-free) DWG. - 600kHz Fixed Oscillator (ISL6341A, ISL6341B) ISL6341ACRZ* 41AC 0 to +70 10 Ld 3x3 TDFN L10.3x3B - Fixed Internal Soft-Start, Capable into a Pre-biased ISL6341BCRZ* 41BC 0 to +70 10 Ld 3x3 TDFN L10.3x3B Load ISL6341CCRZ* 41CC 0 to +70 10 Ld 3x3 TDFN L10.3x3B - Enable/Shutdown Function on COMP/EN Pin ISL6341CRZ* 341C 0 to +70 10 Ld 3x3 TDFN L10.3x3B Pb-Free (RoHS Compliant) ISL6341AIRZ* 41AI -40 to +85 10 Ld 3x3 TDFN L10.3x3B ISL6341BIRZ* 41BI -40 to +85 10 Ld 3x3 TDFN L10.3x3B Applications ISL6341CIRZ* 41CI -40 to +85 10 Ld 3x3 TDFN L10.3x3B Power Supplies for Microprocessors or Peripherals ISL6341IRZ* 6341 -40 to +85 10 Ld 3x3 TDFN L10.3x3B - PCs, Servers, Memory Supplies ISL6341EVAL1Z Evaluation Board - DSP and Core Communications Processor Supplies *Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. Subsystem Power Supplies NOTE: These Intersil Pb-free plastic packaged products employ special - PCI, AGP Graphics Cards Digital TV Pb-free material sets, molding compounds/die attach materials, and - SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus 100% matte tin plate plus anneal (e3 termination finish, which is RoHS Termination Supply compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak Cable Modems, Set-Top Boxes, and DSL Modems reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Industrial Power Supplies General Purpose Supplies 5V or 12V-Input DC/DC Regulators Low-Voltage Distributed Power Supplies Point of Load FN6538 Rev 2.00 Page 1 of 18 Dec 2, 2008ISL6341, ISL6341A, ISL6341B, ISL6341C Pinout ISL6341, ISL6341A, ISL6341B, ISL6341C (10 LD 3x3 TDFN) TOP VIEW BOOT PGOOD 1 10 PHASE 2 9 VOS UGATE 3 8 FB LGATE/OCSET 4 7 COMP/EN GND 5 6 VCC Block Diagram VCC POR AND INTERNAL BOOT SAMPLE + REGULATOR SOFT-START - AND OC UGATE HOLD COMPARATOR 5V INT. 10A PHASE 20k ERROR PWM AMP TO INHIBIT COMPARATOR LGATE/OCSET GATE 0.8V + + CONTROL - - PWM LOGIC VCC FB EN LGATE/OCSET + +25% - OV1 GND 5V INT. -25% + 0.7V EN - - + UV1 OSCILLATOR 20A COMP/EN OC 300kHz OR 600kHz + - PGOOD +10% OV2 VOS -10% + - UV2 FN6538 Rev 2.00 Page 2 of 18 Dec 2, 2008