Datasheet LT8610AX (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 42V, 3.5A Synchronous Step-Down Regulator with Operation to 175°C |
| Seiten / Seite | 6 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. 3.3V Step-Down … |
| Dateiformat / Größe | PDF / 525 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. 3.3V Step-Down Converter. Efficiency at. Efficiency at 175°C 175°C
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LT8610AX 42V, 3.5A Synchronous Step-Down Regulator with Operation to 175°C
FEATURES DESCRIPTION
n 100% Tested at 175°C The LT®8610AX is a compact, high efficiency, high speed n ±2% Reference Accuracy Over –40°C to 175°C Range synchronous monolithic step-down switching regulator n Wide Input Voltage Range: 3.7V to 42V rated to 175°C junction temperature. The LT8610AX is n Ultralow Quiescent Current Burst Mode® Operation 100% tested a 175°C. Top and bottom power switches n High Efficiency Synchronous Operation are included with all necessary circuitry to minimize the n 91% Eff. at 0.5A, at 175°C, 3.3VOUT from 12VIN need for external components. Low ripple Burst Mode n 92% Eff. at 0.5A, at 175°C, 5VOUT from 12VIN operation enables high efficiency across a wide range of n Adjustable and Synchronizable Frequency: 200kHz output currents while keeping the output ripple low. A SYNC to 2.2MHz pin allows synchronization to an external clock. Internal n No Thermal Shutdown compensation with peak current mode topology allows n Internal Compensation the use of small inductors and results in fast transient n Output Soft-Start and Tracking response and good loop stability. The EN/UV pin has an n Power Good Flag accurate 1V threshold and can be used to program VIN n Small Thermally-Enhanced 16-Lead MSOP Package undervoltage lockout or to shut down the LT8610AX. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup while the PG flag signals when
APPLICATIONS
VOUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8610AX is available in n Oil and Gas Exploration small 16-lead MSOP package with exposed pad for low thermal resistance. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 3.3V Step-Down Converter Efficiency at Efficiency at 175°C 175°C
100 VIN VIN BST 90 3.7V TO 42V 4.7µF 0.1µF 4.7µH EN/UV V 80 OUT SW 3.3V LT8610AX 70 100nF 47µF 3.5A BIAS 60 49.9k TR/SS ×2 PG 1210 50 1µF 100k X7R FB 40 INTVCC 10pF EFFICIENCY (%) 30 RT GND SYNC 20 TA = 175°C 60.4k 41.2k 12V 10 IN f 0 SW = 700kHz 8610AX TA01a 1 10 100 1k 10k LOAD CURRENT (mA) 8610AX TA01b 8610axf For more information www.linear.com/LT8610AX 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Related Parts
FEATURES DESCRIPTION
n 100% Tested at 175°C The LT®8610AX is a compact, high efficiency, high speed n ±2% Reference Accuracy Over –40°C to 175°C Range synchronous monolithic step-down switching regulator n Wide Input Voltage Range: 3.7V to 42V rated to 175°C junction temperature. The LT8610AX is n Ultralow Quiescent Current Burst Mode® Operation 100% tested a 175°C. Top and bottom power switches n High Efficiency Synchronous Operation are included with all necessary circuitry to minimize the n 91% Eff. at 0.5A, at 175°C, 3.3VOUT from 12VIN need for external components. Low ripple Burst Mode n 92% Eff. at 0.5A, at 175°C, 5VOUT from 12VIN operation enables high efficiency across a wide range of n Adjustable and Synchronizable Frequency: 200kHz output currents while keeping the output ripple low. A SYNC to 2.2MHz pin allows synchronization to an external clock. Internal n No Thermal Shutdown compensation with peak current mode topology allows n Internal Compensation the use of small inductors and results in fast transient n Output Soft-Start and Tracking response and good loop stability. The EN/UV pin has an n Power Good Flag accurate 1V threshold and can be used to program VIN n Small Thermally-Enhanced 16-Lead MSOP Package undervoltage lockout or to shut down the LT8610AX. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup while the PG flag signals when
APPLICATIONS
VOUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8610AX is available in n Oil and Gas Exploration small 16-lead MSOP package with exposed pad for low thermal resistance. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 3.3V Step-Down Converter Efficiency at Efficiency at 175°C 175°C
100 VIN VIN BST 90 3.7V TO 42V 4.7µF 0.1µF 4.7µH EN/UV V 80 OUT SW 3.3V LT8610AX 70 100nF 47µF 3.5A BIAS 60 49.9k TR/SS ×2 PG 1210 50 1µF 100k X7R FB 40 INTVCC 10pF EFFICIENCY (%) 30 RT GND SYNC 20 TA = 175°C 60.4k 41.2k 12V 10 IN f 0 SW = 700kHz 8610AX TA01a 1 10 100 1k 10k LOAD CURRENT (mA) 8610AX TA01b 8610axf For more information www.linear.com/LT8610AX 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Related Parts