TS33000

Final Datasheet

Rev 1.9

May 1, 2015

www.semtech.com

1 of 17

Semtech

TS33000

TRIUNE PRODUCTS

High Efficiency Synchronous

DC/DC Buck Converter

Features

•

Fixed Output option has automatic low power PFM mode

for reduced quiescent current at light loads

•

2.25MHz +/- 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: 2.0V 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 100nA 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

Description

The TS33000 is a DC/DC synchronous switching regulator

with fully integrated power switches, internal compensation,

and full fault protection. The switching frequency of 2.25MHz

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 TS33000 utilizes PWM voltage mode feedback with input

voltage feed-forward to provide a wide input voltage range

without the need for external compensation.

For the Fixed Output option, 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 (Fixed Output only).

The TS33000 integrates a wide range of protection circuitry;

including input supply under-voltage lockout, output under-

voltage, output over-voltage, soft start, high side FET and low

side FET current limits, and thermal shutdown.

Typical Applications

VOUT

4.7uF

1.5uH

Fixed Output

EN

VSW

VCC

FB

VOUT

Sense

2x4.7uF

VCC

EN

PG

PG

10 kohm

(optional)

VCC or VOUT

nLP

nLP