TPS60300, TPS60301, TPS60302, TPS60303

SINGLE-CELL TO 3.0-V/3.3-V, 20-mA DUAL OUTPUT,

HIGH-EFFICIENCY CHARGE PUMP

SLVS302A – DECEMBER 2000 – REVISED MARCH 2001

4

POST OFFICE BOX 655303

detailed description

operating principle

The TPS6030x charge pumps are voltage quadruplers that provide a regulated 3.3-V or 3.0-V output from a

0.9-V to 1.8-V input. They deliver a maximum load current of 20 mA. Designed specifically for space critical

battery powered applications, the complete converter requires only five external capacitors and enables the

design to use low-cost, small-sized, 1-

µF ceramic capacitors. The TPS6030x circuits consist of an oscillator,

a voltage reference, an internal resistive feedback circuit, an error amplifier, two charge pump stages with

MOSFET switches, a shutdown/start-up circuit, and a control circuit.

shutdown

Driving EN low disables the converter. This disables all internal circuits, reducing input current to only 0.05

µA.

Leakage current drawn from the output pins OUT1 and OUT2 is a maximum of 1

µA. The device exits shutdown

once EN is set high (see start-up procedure described below). The typical no-load, start-up time is 400

µs. When

the device is disabled, the load is isolated from the input. This is an important feature in battery operated

products because it extends the battery shelf life.

start-up procedure

The device is enabled when EN is set from logic low to logic high. CP1 will first enter a dc start-up mode during

OUT1, after that, it will also start switching and boost up the voltage to its nominal value. EN must not exceed

the highest voltage applied to the device.

NOTE:

power-good detector

The power-good output is an open-drain output on the TPS60300 and TPS60301 or a push-pull output on the

TPS60302 and TPS60303. The PG-output pulls low when the output of OUT2 is out of regulation. When the

output rises to within 98% of regulation, the power-good output goes active high. In shutdown, power-good is

pulled low. In normal operation, an external pullup resistor with the TPS60300 and TPS60301 is typically used

to connect the PG pin to VOUT. The resistor should be in the 100-k

Ω to 1-MΩ range. If the PG output is not used,

it should remain unconnected. Output current at PG (TPS60302, TPS60303) will reduce maximum output

current at OUT2.