基于TPS650001 的采用 2.25MHz 降压转换器且具有双路 LDO 和 SVS 的电源管理 IC (P...

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基于TPS650001 的采用 2.25MHz 降压转换器且具有双路 LDO 和 SVS 的电源管理 IC (PMIC)

　　1 Features

　　Step-Down Converters:

　　VIN Range From 2.3 V to 6 V

　　Spread Spectrum Clock (SSC) Generation for Reduced EMI

　　2.25-MHz Fixed Frequency Operation

　　600-mA or 1-A (TPS650061) Output Current

　　Low Dropouts (LDOs):

　　VIN Range From 1.6 V to 6 V

　　Adjustable Output Voltage

　　Up to 300-mA Output Current

　　Separate Power Inputs and Enables

　　Supply Voltage Supervisor (TPS65001)

　　Manual Reset Input for Push Button

　　Adjustable Reset Time

　　Adjustable Reset Voltage

　　3-mm × 3-mm 16-Pin WQFN (TPS65000)

　　3-mm × 3-mm 20-Pin WQFN (TPS65001)

　　2 Applications

　　Points-of-Load

　　Embedded Processor Power

　　Cell Phones

　　Smart Phones

　　PDAs

　　Pocket PCs

　　Portable Media Players

　　3 Description

　　The TPS6500xx devices are single-chip power management (PWM) ICs for portable applications. Both devices combine a single step-down converter with two low-dropout (LDO) regulators. The step-down converter enters a low-power mode at light load for maximum efficiency across the widest possible range of load currents. For low-noise applications, the devices can be forced into fixed-frequency PWM through a pin. The step-down converter is small because of its small inductor and capacitors. The step-down converter has power good status output for sequencing. The LDOs can supply 300 mA and operate with an input voltage range from 1.6 V to 6 V. A step-down converter or main battery can power the LDOs directly. The step-down converter and the LDOs have separate voltage inputs that enable maximum design and sequencing flexibility.

　　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.

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