Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LT8607, a 750 mA, 42 V input synchronous step-down switching regulator. A unique synchronous rectification topology delivers 93 percent efficiency while switching at 2 MHz, enabling designers to avoid critical noise-sensitive frequency bands, such as AM radio while using a very compact solution footprint.
Burst Mode® operation keeps quiescent current under 3 µA in no-load standby conditions, ideal for always-on systems. The device’s 3 to 42 V input voltage range is well suited for automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3 V and load dump transients in excess of 40 V. Its internal 1.2 A switches deliver up to 750 mA of continuous output current. The LT8607 maintains a minimum dropout voltage of only 250 mV (at 500 mA) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Spread spectrum frequency modulation and special design techniques ensure low EMI operation, enabling it to meet CISPR25, Class 5 EMI limits required by many automotive and industrial applications. Furthermore, a fast minimum on-time of only 45 ns enables 2 MHz constant frequency switching from a 16 V input to a 1.5 V output. The LT8607’s 8-lead thermally enhanced 2 mm x 2 mm DFN or 10-lead MSOP package and high switching frequency, which keeps the external inductor and capacitors small, provide a compact, thermally efficient footprint.
The LT8607 utilizes internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10 mVP-P. Unique design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8607’s current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output soft-start/tracking and thermal protection.
The LT8607EDC is offered in a 2 mm x 2 mm 8-lead DFN package, whereas the LT8607EMSE is in a thermally enhanced MSOP-10 package. Industrial temperature versions, the LT8607IDC and LT8607IMSE, are tested and guaranteed to operate from a –40°C to 125°C operating junction temperature. Pricing starts at $2.15 each in 1000-piece quantities and all versions are available from stock. For more information, visit www.linear.com/product/LT8607.
Summary of Features: LT8607
- Wide Input Voltage Range: 3 to 42 V
- Ultralow Quiescent Current Burst Mode® Operation:
- < 3 µA IQ Regulating 12 VIN to 3.3 VOUT
- Output Ripple < 10 mVP-P
- High Efficiency 2 MHz Synchronous Operation:
- > 93 Percent Efficiency at 0.5 A, 12 VIN to 5 VOUT
- 750 mA Maximum Continuous Output
- Fast Minimum Switch-On Time: 45 ns
- Adjustable & Synchronizable: 200 kHz to 2.2 MHz
- Spread Spectrum Frequency Modulation for Low EMI
- Allows Use of Small Inductors
- Low Dropout
- Peak Current Mode Operation
- Accurate 1 V Enable Pin Threshold
- Internal Compensation
- Output Soft-Start & Tracking
- Tiny 2 mm x 2 mm 8-Lead DFN or 10-Lead MSOP Package