ADP5310 Series

3-Channel, Integrated Ultralow Power Solution with Dual Buck Regulators and Load Switch

Catalog

3-Channel, Integrated Ultralow Power Solution with Dual Buck Regulators and Load Switch

Part	Voltage - Output (Min/Fixed)	Function	Synchronous Rectifier	Supplier Device Package	Topology	Output Type	Number of Outputs	Frequency - Switching	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Max) [Max]	Output Configuration	Mounting Type	Voltage - Input (Min) [Min]	Package / Case [custom]	Package / Case	Package / Case [custom]	Voltage - Output (Max)	Voltage - Output (Min/Fixed) [Min]
Analog Devices ADP5310AREZN-R7	0.8 V	Step-Down		16-TSSOP-EP	Buck	Adjustable	2	1.2 GHz 600 kHz	-40 °C	125 ¯C	15 V	Positive	Surface Mount	2.7 V	0.173 "	16-TSSOP Exposed Pad	4.4 mm	5 V
Analog Devices ADP5310AREZN-3.3R7	3.3 V	Step-Down		16-TSSOP-EP	Buck	Adjustable (Fixed)	2	1.2 GHz 600 kHz	-40 °C	125 ¯C	15 V	Positive	Surface Mount	2.7 V	0.173 "	16-TSSOP Exposed Pad	4.4 mm	5 V	0.8 V

Catalog

3-Channel, Integrated Ultralow Power Solution with Dual Buck Regulators and Load Switch

Key Features

• Wide input voltage range: 2.7V to 15.0 V

• 700 nA quiescent current when EN1 = SYNC/MODE = low

• ±1.5% output accuracy over full temperature range in PWM mode

• 600 kHz (or 1.2 MHz) switching frequency with optional synchronization input from 400 kHz to 1.4 MHz

• Channel 1: 800 mA buck regulatorAutomatic PSM/PWM or forced PWM mode via factory fuse100% duty cycle operation modeAdjustable/fixed output options via factory fusePower-good flag

• Automatic PSM/PWM or forced PWM mode via factory fuse

• 100% duty cycle operation mode

• Adjustable/fixed output options via factory fuse

• Power-good flag

• Channel 2: ultralow power buck regulatorSelectable hysteresis or PWM operation modeOutput current up to 50 mA in hysteresis mode, 300 mA in PWM mode with 100% duty cycle operation modeLow noise at 0.8 V reference in PWM modeAdjustable/fixed output voltage options via factory fuse

• 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 factory fuse

• Channel 3: high-side load switchLow RDS(ON)of 494 mΩ at VOUT3= 2.5 V

• 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

Description

The ADP5310 combines dual buck regulators and one load switch in a 16-lead TSSOP_EP package that meets demanding performance 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 batterypowered 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 undervoltage lockout (UVLO). The ADP5310 is rated for the −40°C to +125°C junction temperature range.ApplicationsEnergy (gas and water) meteringPortable and battery-powered equipmentMedical applicationsKeep-alive power supplies