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XR76201-03-05-08 Step-Down Regulators

MaxLinear's XR76201-03-05-08 step-down regulators provide extremely fast line and load transient response with no loop compensation required

Image of Exar's XR76203/05/08 Step-Down RegulatorsMaxLinear's 1 A, 3 A, 5 A, and 8 A 40 V synchronous step-down regulators in small 5 mm by 5 mm QFN packages utilize MaxLinear's proprietary constant on-time architecture to provide superior line and load regulation, fast transient response, and stability with ceramic output capacitors.

The XR76201, XR76203, XR76205, and XR76208 are synchronous step-down regulators combining the controller, drivers, bootstrap diode, and MOSFETs in a single package for point-of-load supplies. The XR76201, XR76203, XR76205, and XR76208 have load current ratings of 1 A, 3 A, 5 A, and 8 A, respectively. A wide 3 V to 40 V input voltage range allows for single supply operation from industry standard 24 V ± 10%, 18 V to 36 V, and rectified 18 V AC and 24 VAC rails.

With a proprietary emulated current mode constant-on-time (COT) control scheme, the XR76201, XR76203, XR76205, and XR76208 provide extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.05% (XR76201) or 0.07% (XR76203, XR76205, XR76208) load regulation, 0.15% line regulation, and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous conduction mode (DCM) at light current loads, thereby significantly increasing the converter efficiency.

Features
  • 1 A, 3 A, 5 A, 8 A point-of-load step-down regulators
  • Wide 5.0 V to 40 V continuous input voltage range
    • 3 V to 40 V PVIN with 5 V bias
    • 4.5 V to 5.5 V single supply operation
    •  >0.6 V adjustable output voltage
  • Proprietary constant on-time control
    • No loop compensation required
    • Stable ceramic output capacitor operation
    • Programmable 200 ns to 2 µs on-time
    • Constant 100 kHz to 800 kHz frequency
  • Selectable CCM or CCM/DCM
    • CCM/DCM for high-efficiency at light-load
    • CCM for constant frequency at light-load
  • Programmable current limit
  • Programmable hiccup current limit with thermal compensation
  • Precision enable and power-good flag
  • Programmable soft-start
  • 5 mm x 5 mm QFN package - common scalable footprint
  • Also available in 3000 piece tape and reel package
Application
  • Point-of-load conversion
  • Distributed power architecture
  • FPGA/DSP/processor supplies
  • Industrial PCs
  • Switches/routers
  • Servers
  • Base stations

XR76201-03-05-08 Evaluation Boards

ImageManufacturer Part NumberDescriptionAvailable Quantity
EVAL BOARD XR76201 1.5A 40V COTXR76201EVBEVAL BOARD XR76201 1.5A 40V COT2 - ImmediateView Details
EVAL BOARD XR76203 3A 40V COTXR76203EVBEVAL BOARD XR76203 3A 40V COT0View Details
EVAL BOARD XR76205 5A 40V COTXR76205EVBEVAL BOARD XR76205 5A 40V COT4 - ImmediateView Details
EVAL BOARD XR76208 8A 40V COTXR76208EVBEVAL BOARD XR76208 8A 40V COT7 - ImmediateView Details

XR76201-03-05-08 Step-Down Regulators

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC REG BUCK ADJUSTABLE 3A 30QFNXR76203ELMTR-FIC REG BUCK ADJUSTABLE 3A 30QFN0View Details
IC REG BUCK ADJUSTABLE 5A 30QFNXR76205ELMTR-FIC REG BUCK ADJUSTABLE 5A 30QFN0View Details
IC REG BUCK ADJUSTABLE 8A 30QFNXR76208ELMTR-FIC REG BUCK ADJUSTABLE 8A 30QFN0View Details
IC REG BUCK ADJUSTABLE 3A 30QFNXR76203EL-FIC REG BUCK ADJUSTABLE 3A 30QFN0View Details
IC REG BUCK ADJUSTABLE 5A 30QFNXR76205EL-FIC REG BUCK ADJUSTABLE 5A 30QFN0View Details
IC REG BUCK ADJUSTABLE 8A 30QFNXR76208EL-FIC REG BUCK ADJUSTABLE 8A 30QFN0View Details
IC REG BUCK ADJ 1.5A 30QFNXR76201ELIC REG BUCK ADJ 1.5A 30QFN0View Details
Updated: 2017-02-03
Published: 2015-08-13