特性 Features

? Fixed Output option has automatic low power PFM mode

for reduced quiescent current at light loads

? 5MHz +/- 10 fixed switching frequency

? Fixed output voltages: 0.8V, 0.9V, 1.2V, 1.5V, 1.8V,

? 2.5V, and 3.3V with +/- 2 output tolerance

? Input voltage range: 2.5V to 5.5V

? Voltage mode PWM control with input voltage feed-

? Forward compensation

? Voltage supervisor for VOUT reported at the PG pin

? Input supply under voltage lockout

? Soft start for controlled startup with no overshoot

? Full protection for over-current, over-temperature,

? and VOUT overvoltage

? Less than 200nA in shutdown mode

? Multiple enable pins for flexible system sequencing

? Low external component count

? Junction operating temperature -40C to 125C

? Packaged in a 16 pin QFN (3x3)

Applications

? Point of load

? Systems with deep submicron ASICs/FPGAs

? Set-top box

? Communications equipment

? Portable and handheld equipment

描述 Description

The TS33001/2/3 (1/2/3A) are DC/DC synchronous switching

regulators with fully integrated power switches, internal

compensation, and full fault protection. The switching

frequency of 5MHz enables the use of extremely small filter

components, resulting in smaller board space and reduced

BOM costs.

When the input current is greater than approximately 50mA,

the TS33001/2/3 utilizes PWM voltage mode feedback with input

voltage feed-forward to provide a wide input voltage range

without the need for external compensation.

When the input current is less than 50mA, the device uses a

PFM mode to provide increased efficiency at light loads. The

cross over between PFM mode and PWM is automatic and

has hysteresis to prevent oscillation between the modes.

Additionally, the nLP mode pin can be used to force the device

into PWM mode to reduce the output ripple, if needed.

The TS33001/2/3 integrates a wide range of protection circuitry;

including input supply under-voltage lockout, output undervoltage, output over-voltage, soft start, high side FET and low side

FET current limits, and thermal shutdown.