PMBT3904QA - 40 V, 200 mA NPN switching transistor - 艾金森 Dratk PQMD12 - NPN/PNP resistor-equipped transistors; R1?=?47?kΩ,?R2?=?47?kΩ - 艾金森 Dratk PZU6.2B2 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PBSS5320D - 20 V low VCEsat PNP transistor - 艾金森 Dratk PZU5.1B1A - Single Zener diodes - 艾金森 Dratk PMBT3904VS - 40 V, 200 mA NPN/NPN switching transistor - 艾金森 Dratk PBSS5320T - 20 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PZU5.1B2A - Single Zener diodes - 艾金森 Dratk PQMD13 - NPN/PNP resistor-equipped transistors; R1?=?4.7?k?,?R2?=?47?k? - 艾金森 Dratk PZU6.2B3 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PMBT3906 - PNP switching transistor - 艾金森 Dratk PQMD16 - NPN/PNP resistor-equipped transistors; R1?=?22?k?,?R2?=?47?k? - 艾金森 Dratk PZU6.8B - Single Zener diodes in a SOD323F package - 艾金森 Dratk PZU5.1B2L - Single Zener diodes - 艾金森 Dratk PBSS5320X - 20 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PMBT3906M - 40 V, 200 mA PNP switching transistor - 艾金森 Dratk PZU6.8B1 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PQMH2 - NPN/NPN resistor-equipped transistors; R1?=?47?k?,?R2?=?47?k? - 艾金森 Dratk PBSS5330PA - 30 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PZU5.1B3A - Single Zener diodes - 艾金森 Dratk PMBT3906MB - 40 V, 200 mA PNP switching transistor - 艾金森 Dratk PZU6.8B2 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PBSS5330PAS - 30 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PQMH9 - NPN/NPN resistor-equipped transistors; R1?=?10?k?,?R2?=?47?k? - 艾金森 Dratk PZU5.1BA - Single Zener diodes - 艾金森 Dratk PMBT3906VS - 40 V, 200 mA PNP/PNP switching transistor - 艾金森 Dratk PZU6.8B3 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PBSS5330X - 30 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PQMH10 - NPN/NPN resistor-equipped transistors; R1?=?2.2?k?,?R2?=?47?k? - 艾金森 Dratk PZU7.5B - Single Zener diodes in a SOD323F package - 艾金森 Dratk PZU5.1BL - Single Zener diodes - 艾金森 Dratk PMBT3946VPN - 40 V, 200 mA NPN/PNP switching transistor - 艾金森 Dratk PBSS5350D - 50 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PZU5.6B1A - Single Zener diodes - 艾金森 Dratk PQMH11 - NPN/NPN resistor-equipped transistors; R1?=?10?k?,?R2?=?10?k? - 艾金森 Dratk PZU7.5B1 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PMBT4401 - NPN switching transistor - 艾金森 Dratk PZU5.6B2A - Single Zener diodes - 艾金森 Dratk PBSS5350T - 50 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PQMH13 - NPN/NPN resistor-equipped transistors; R1?=?4.7?k?,?R2?=?47?k? - 艾金森 Dratk PZU7.5B2 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PMBT4401YS - 40 V, 600 mA, double NPN switching transistor - 艾金森 Dratk PBSS5350TH - 50 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PRMB11 - 50 V, 100 mA PNP/PNP Resistor-Equipped double Transistors (RET) - 艾金森 Dratk PZU5.6B2L - Single Zener diodes - 艾金森 Dratk PZU7.5B3 - Single Zener diodes in a SOD323F package - 艾金森 Dratk PMBT4403 - 40 V, 600 mA, PNP switching transistor - 艾金森 Dratk PZU8.2B - Single Zener diodes in a SOD323F package - 艾金森 Dratk PBSS5350X - 50 V, 3 A PNP low VCEsat (BISS) transistor - 艾金森 Dratk PZU5.6B3A - Single Zener diodes - 艾金森 Dratk
ISL6545
5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

热度 100

The ISL6545, ISL6545A makes simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter driving N-Channel MOSFETs in a synchronous buck topology. Since it can work with either 5V or 12V supplies, this one IC can be used in a wide variety of applications within a system. The ISL6545, ISL6545A (hereafter referred to as "ISL6545x", except as needed) integrates the control, gate drivers, output adjustment, monitoring and protection functions into a single 8 Ld SOIC or 10 Ld DFN package.

The ISL6545x provides single feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.6V, with a maximum tolerance of ±1.0% over-temperature and line voltage variations. A selectable fixed frequency oscillator (ISL6545 for 300kHz; ISL6545A for 600kHz) reduces design complexity, while balancing typical application cost and efficiency.

The error amplifier features a 20MHz gain-bandwidth product and 9V/μs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the lower MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor.

  • Operates from +5V or +12V Supply Voltage (for bias)
    • 1.0V to 12V VIN Input Range (up to 20V possible with restrictions; see Input Voltage Considerations)
    • 0.6V to VIN Output Range
    • Integrated Gate Drivers use VCC (5V to 12V)
    • 0.6V Internal Reference; ±1.0% tolerance
      • Power Supplies for Microprocessors or Peripherals
        • PCs, Embedded Controllers, Memory Supplies
        • DSP and Core Communications Processor Supplies
        • Subsystem Power Supplies
          • PCI, AGP; Graphics Cards; Digital TV
          • SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus Termination Supply
          • Cable Modems, Set Top Boxes, and DSL Modems
          • Industrial Power Supplies; General Purpose Supplies
          • 5V or 12V-Input DC/DC Regulators
          • Low-Voltage Distributed Power Supplies
 
Alternatives
Parameters ISL6545 ISL6545A ISL8105 ISL8105A
VIN (min) (V)1 1 1 1
VIN (max) (V)12 12 12 12
VOUT (min) (V)0.6 0.6 0.6 0.6
VOUT (max) (V)5 5 5 5
IOUT (max) (A)25 25 25 25
VBIAS (min)4.5 V 4.5 V 4.9 V 4.9 V
VBIAS (max)14.4 V 14.4 V 14.4 V 14.4 V
IS (typ)3.2 mA 3.2 mA 3.2 mA 3.2 mA
Qualification LevelStandard Standard Standard Standard

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