TPS65000_15 Datasheet, PDF (12/40 Pages) Texas Instruments – Step-Down Converter

TPS65000, TPS65001, TPS650001
TPS650003, TPS650006, TPS650061
SLVS810C – JUNE 2009 – REVISED SEPTEMBER 2015
9 Detailed Description
www.ti.com
9.1 Overview
The TPS6500x provides one step-down converter, two low dropout regulators, spread spectrum clock
generation, and a supply voltage supervisor for the TPS65001 only. The device has an input voltage range of
2.3 V to 6 V and is characterized across a –40°C to 85°C range. This device is intended, but not limited, to
powering smart phones, embedded processors, and point-of-load devices.
The output voltage of the step-down converter can be selected through resistor networks on the output. To
maximize efficiency, there are two modes of operation based on load conditions: PWM or PFM. By pulling the
MODE pin high, forced PWM can be achieved. Pulling this pin low results in an automatic adjustment between
PFM and PWM modes.
The two general purpose low drop-out regulators each have their own separate enables and voltage inputs. The
inputs can be tied to the output of the step-down converter or to a separate voltage source. Resistor networks
are required on the output of the regulator to set the output voltage. Their wide voltage range lets them handle
direct connections to a battery.
The switching frequency of the step-down converter is handled by the oscillator, with a typical frequency of
2.25 MHz. The spread spectrum clock (SSC) modulates this frequency when the device is in PWM mode. This
additional circuit in the oscillator block reduces power that may cause EMI.
The TPS6500x devices also provide a power good signal to monitor the condition of the DC-DC and both LDOs.
The DC-DC and LDOs are only monitored if their enable signal is high. If all enabled resources are in regulation,
the pin is pulled low. If one or more of the enabled resources are out of regulation, the pin is pulled in Hi-Z.
The supply voltage supervisor is only available for the TPS65001 and TPS650061 devices. This circuit monitors
the supply voltage to the device that the TPS65001 and TPS650061 is powering for under voltage conditions.
The circuit can connect to a button for manual resets. Reset-recovery time can also be set. Four different
scenarios can trigger the circuit to cause a rest.
12
Submit Documentation Feedback
Copyright © 2009–2015, Texas Instruments Incorporated
Product Folder Links: TPS65000 TPS65001 TPS650001 TPS650003 TPS650006 TPS650061