PDF《ADP5310》

3-Channel, Integrated Ultralow Power Solution with Dual Buck Regulators and Load Switch Data Sheet ADP5310 FEATURES Wide input voltage range: 2.

7 V to 15.0 V

700 nA quiescent current when EN1 = SYNC/MODE = low ±1.5%outputaccuracyoverfulltemperaturerangeinPWMmode

600 kHz (or 1.2 MHz) switching frequency with optional synchronization input from

400 kHz to 1.4 MHz Channel 1:

800 mA buck regulator Automatic PSM/PWM or forced PWM mode via factory fuse 100% duty cycle operation mode Adjustable/fixed output options via factoryfuse Power-good flag Channel 2: ultralow power buck regulator Selectable hysteresis or PWM operation mode Output current up to

50 mA in hysteresis mode,

300 mA in PWM mode with 100% duty cycle operation mode Low noise at 0.8 V reference in PWM mode Adjustable/fixed output voltage options via factoryfuse Channel 3: high-side load switch Low RDS(ON) of

494 mΩ at VOUT3 = 2.5 V Quick output discharge (QOD) option UVLO, OCP, and TSD protection 16-lead TSSOP_EP package ?40°C to +125°C operational junction temperature APPLICATIONS Energy (gas and water) metering Portable and battery-powered equipment Medical applications Keep-alive power supplies TYPICAL APPLICATION CIRCUIT SW1 PGND1 FB1 R1 R2 C3 10?F MLCC L1 4.7?H VOUT1 SW2 PGND2 FB2 C4 10?F MLCC L2 4.7?H VOUT2 VOUT3 VOUT3 ADP5310 EN1 FROM MCU PWRGD TO MCU FROM MCU PVIN1 PVIN2 NC EN3 SYNC/ MODE CHANNEL

1 BUCK REGULATOR (800mA) CHANNEL

3 LOAD SWITCH CHANNEL

2 ULTRALOW POWER BUCK REGULATOR (50mA/300mA) C1 10?F MLCC C + C +

2 * LiMnO2 VIN = 2.7V TO 15V AGND VREG C6 1?F C5 220nF MLCC 13008-001 Figure 1. GENERAL DESCRIPTION The ADP5310 combines dual buck regulators and one load switch in a 16-lead TSSOP_EP package that meets demanding perfor- mance and board space requirements. The device enables direct connection to a wide input voltage range of 2.7 V to 15.0 V, allowing the use of multiple alkaline/NiMH or lithium cells and other power sources. The buck regulator in Channel

1 uses a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient performance, which provides up to

800 mA of output current. The automatic PWM/pulse skipping mode (PSM) control scheme achieves excellent efficiency in light output current. A power-good signal indicates that the output of Channel

1 is within 92% of its nominal value. An ultralow power buck regulator is integrated in Channel

2 with the SYNC/MODE pin to control its operation mode. When SYNC/MODE is set to low, the buck regulator operates in hysteresis mode, which draws only

700 nA of quiescent current to regulate the output under zero load and provides up to

50 mA of output current. Hysteresis mode helps achieve excellent efficiency at less than

1 mW and can work as a keep-alive power supply in a battery- powered system. When the SYNC/MODE pin is set to high, the buck regulator switches to a traditional constant frequency PWM control scheme to provide low output ripple for noise sensitive applications, and the buck regulator provides up to

300 mA of output current in PWM mode. Channel

3 integrates a high-side load switch that operates from 1.65 V to 5.5 V with its input connected to the output of Channel 2. The load switch provides power domain isolation and extends battery operation time. Other key safety features of the ADP5310 include overcurrent protection (OCP), thermal shutdown (TSD), and input under- voltage lockout (UVLO). The ADP5310 is rated for the ?40°C to +125°C junction temperature range. Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No licenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ?2015C2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADP5310 Data Sheet Rev. A | Page