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.
Applications
- Energy (gas and water) metering
- Portable and battery-powered equipment
- Medical applications
- Keep-alive power supplies
