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ADP2303-EVALZ Arkusz danych(PDF) 1 Page - Analog Devices |
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ADP2303-EVALZ Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 28 page 2 A/3 A, 20 V, 700 kHz, Nonsynchronous Step-Down Regulators Data Sheet ADP2302/ADP2303 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevices foritsuse,norforanyinfringements of patents orother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010–2012 Analog Devices, Inc. All rights reserved. FEATURES Wide input voltage range: 3.0 V to 20 V Maximum load current 2 A for ADP2302 3 A for ADP2303 ±1.5% output accuracy over temperature Output voltage down to 0.8 V 700 kHz switching frequency Current-mode control architecture Automatic PFM/PWM mode Precision enable pin with hysteresis Integrated high-side MOSFET Integrated bootstrap diode Internal compensation and soft start Power-good output Undervoltage lockout (UVLO) Overcurrent protection (OCP) Thermal shutdown (TSD) 8-lead SOIC package with exposed paddle Supported by ADIsimPower™ design tool APPLICATIONS Intermediate power rail conversion DC-to-DC point of load applications Communications and networking Industrial and instrumentation Healthcare and medical Consumer TYPICAL APPLICATIONS CIRCUIT VIN VIN VOUT ADP2302/ ADP2303 PGOOD EN GND OFF ON BST SW FB Figure 1. Typical Application Circuit 40 50 60 70 80 90 100 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) INDUCTOR: VLF10040T -4R7N5R4 DIODE: SSB43L VOUT = 3.3V VOUT = 5.0V Figure 2. ADP2303 Efficiency vs. Output Current at VIN = 12 V GENERAL DESCRIPTION The ADP2302/ADP2303 are fixed frequency, current-mode control, step-down, dc-to-dc regulators with an integrated power MOSFET. The ADP2302/ADP2303 can run from an input voltage of 3.0 V to 20 V, which makes them suitable for a wide range of applications. The output voltage of the ADP2302/ ADP2303 can be down to 0.8 V for the adjustable version, while the fixed output version is available in preset output voltage options of 5.0 V, 3.3 V, and 2.5 V. The 700 kHz operating frequency allows small inductor and ceramic capacitors to be used, providing a compact solution. Current mode control provides fast and stable line and load transient performance. The ADP2302/ADP2303 have integrated soft start circuitry to prevent a large inrush current at power-up. The power-good signal can be used to sequence devices that have an enable input. The precision enable threshold voltage allows the part to be easily sequenced from other input/output supplies. Other key features include undervoltage lockout (UVLO), overvoltage protection (OVP), thermal shutdown (TSD), and overcurrent protection (OCP). The ADP2302/ADP2303 devices are available in the 8-lead, SOIC package with exposed paddle and are rated for the −40oC to +125oC junction temperature range. |
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