Datasheet ADP2127 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Ultralow Profile, 500 mA, 6 MHz, Synchronous, Step-Down, DC-to-DC, EWLP |
| 页数 / 页 | 20 / 1 — Ultralow Profile, 500 mA, 6 MHz, Synchronous,. Step-Down, DC-to-DC … |
| 修订版 | B |
| 文件格式/大小 | PDF / 884 Kb |
| 文件语言 | 英语 |
Ultralow Profile, 500 mA, 6 MHz, Synchronous,. Step-Down, DC-to-DC Converters. Data Sheet. ADP2126. /ADP2127. FEATURES
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Ultralow Profile, 500 mA, 6 MHz, Synchronous, Step-Down, DC-to-DC Converters Data Sheet ADP2126 /ADP2127 FEATURES TYPICAL APPLICATIONS CIRCUIT 1.20 V and 1.26 V fixed output voltage options ADP2126/ Clock signal enable L ADP2127 1.0µH Logic signal enable also available on certain models INPUT OUTPUT VOLTAGE A2 VIN SW B1 VOLTAGE 6 MHz operating frequency 2.1V TO 5.5V 1.20V OR 1.26V Spread spectrum frequency modulation to reduce EMI CIN COUT 2.2µF 500 mA continuous output current 2.2µF C2 GND FB C1 Input voltage: 2.1 V to 5.5 V EXTCLK MODE 0.3 μA (typical) shutdown supply current B2 A1 Pin-selectable power-saving mode PWM Compatible with tiny multilayer inductors AUTO Internal synchronous rectifier OFF ON * Internal compensation ON OR OFF Internal soft start
001
Output-to-ground short-circuit protection
8- 65
*LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS.
09
Current-limit protection
Figure 1.
Undervoltage lockout Thermal shutdown protection 0.330 mm height (maximum), 6-ball BUMPED_CHIP (ADP2126) 0.200 mm height (maximum), 6-pad EWLP (ADP2127) APPLICATIONS Mobile phones Digital still/video cameras Digital audio Portable equipment Camera modules Image stabilization systems GENERAL DESCRIPTION
The ADP2126/ADP2127 are high frequency, step-down, dc-to- The ADP2126/ADP2127 are enabled by a 6 MHz to 27 MHz dc converters optimized for portable applications in which board external clock signal applied to the EXTCLK pin. Certain models area and battery life are critical constraints. The fixed 6 MHz can also be enabled with a logic high signal. When the external clock operating frequency enables the use of tiny ceramic inductors is not switching and in a low logic state, the ADP2126/ADP2127 and capacitors and the regulators use spread spectrum frequency stop regulating and shut down to draw less than 0.3 μA (typical) modulation to reduce EMI. Additionally, synchronous rectification from the source. improves efficiency and results in fewer external components. The ADP2126/ADP2127 have an input voltage range of 2.1 V to At high load currents, the ADP2126/ADP2127 use a voltage 5.5 V, allowing the use of single Li+/Li polymer cell, three-cell regulating pulse-width modulation (PWM) mode that maintains alkaline, NiMH cell, and other standard power sources. The a constant frequency with excellent stability and transient response. ADP2126/ADP2127 are internally compensated to minimize Light load operation is determined by the state of the MODE pin. external components and can source up to 500 mA. Other key In forced PWM mode, the converter continues operating in PWM features, such as cycle-by-cycle peak current limit, soft start, for light loads. Under light load conditions in auto mode, the undervoltage lockout (UVLO), output-to-ground short-circuit ADP2126/ADP2127 automatically enter a power-saving mode, protection, and thermal shutdown provide protection for internal which uses pulse frequency modulation (PFM) to reduce the and external circuit components. effective switching frequency, thus ensuring the longest battery life in portable applications.
Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL CONSIDERATIONS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW EXTERNAL CLOCK (EXTCLK) ENABLE SPREAD SPECTRUM OSCILLATOR MODE SELECTION Pulse-Width Modulation (PWM) Mode Auto Mode (PFM and PWM Switching) Pulse Frequency Modulation (PFM) Mode Mode Transition INTERNAL CONTROL FEATURES Synchronous Rectification Soft Start PROTECTION FEATURES Overcurrent Protection Output Short-Circuit Protection (SCP) Thermal Shutdown (TSD) Protection Undervoltage Lockout (UVLO) TIMING CONSTRAINTS Shutdown Time Power-Off Time APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE
001
Output-to-ground short-circuit protection
8- 65
*LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS.
09
Current-limit protection
Figure 1.
Undervoltage lockout Thermal shutdown protection 0.330 mm height (maximum), 6-ball BUMPED_CHIP (ADP2126) 0.200 mm height (maximum), 6-pad EWLP (ADP2127) APPLICATIONS Mobile phones Digital still/video cameras Digital audio Portable equipment Camera modules Image stabilization systems GENERAL DESCRIPTION
The ADP2126/ADP2127 are high frequency, step-down, dc-to- The ADP2126/ADP2127 are enabled by a 6 MHz to 27 MHz dc converters optimized for portable applications in which board external clock signal applied to the EXTCLK pin. Certain models area and battery life are critical constraints. The fixed 6 MHz can also be enabled with a logic high signal. When the external clock operating frequency enables the use of tiny ceramic inductors is not switching and in a low logic state, the ADP2126/ADP2127 and capacitors and the regulators use spread spectrum frequency stop regulating and shut down to draw less than 0.3 μA (typical) modulation to reduce EMI. Additionally, synchronous rectification from the source. improves efficiency and results in fewer external components. The ADP2126/ADP2127 have an input voltage range of 2.1 V to At high load currents, the ADP2126/ADP2127 use a voltage 5.5 V, allowing the use of single Li+/Li polymer cell, three-cell regulating pulse-width modulation (PWM) mode that maintains alkaline, NiMH cell, and other standard power sources. The a constant frequency with excellent stability and transient response. ADP2126/ADP2127 are internally compensated to minimize Light load operation is determined by the state of the MODE pin. external components and can source up to 500 mA. Other key In forced PWM mode, the converter continues operating in PWM features, such as cycle-by-cycle peak current limit, soft start, for light loads. Under light load conditions in auto mode, the undervoltage lockout (UVLO), output-to-ground short-circuit ADP2126/ADP2127 automatically enter a power-saving mode, protection, and thermal shutdown provide protection for internal which uses pulse frequency modulation (PFM) to reduce the and external circuit components. effective switching frequency, thus ensuring the longest battery life in portable applications.
Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL CONSIDERATIONS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW EXTERNAL CLOCK (EXTCLK) ENABLE SPREAD SPECTRUM OSCILLATOR MODE SELECTION Pulse-Width Modulation (PWM) Mode Auto Mode (PFM and PWM Switching) Pulse Frequency Modulation (PFM) Mode Mode Transition INTERNAL CONTROL FEATURES Synchronous Rectification Soft Start PROTECTION FEATURES Overcurrent Protection Output Short-Circuit Protection (SCP) Thermal Shutdown (TSD) Protection Undervoltage Lockout (UVLO) TIMING CONSTRAINTS Shutdown Time Power-Off Time APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE