LTC1515CS8-3SLASH5 datasheet(5/8 Pages) LINER

5 / 8 page

LTC1515 Series

PIN FUNCTIONS

C1+ (Pin 6): Charge Pump Flying Capacitor, Positive

Terminal.

VIN (Pin 7): Charge Pump Input Voltage. May be between

2V and 10V. VIN should be bypassed with a ≥ 10µF low

ESR capacitor as close as possible to the pin for best

performance.

VOUT (Pin 8): Regulated Output Voltage. Pin selectable to

either 3V/5V, 3.3V/5V or adjustable using an external

resistor divider (LTC1515). VOUT should be bypassed with

≥ 10µF low ESR capacitor as close as possible to the pin

for best performance.

BLOCK DIGRAM

SI PLIFIED

APPLICATIONS INFORMATION

Regulator Operation

The regulator section of the LTC1515, LTC1515-3/5 and

LTC1515-3.3/5 consists of a charge pump, reference,

comparator and some logic. The divided down output

voltage is compared to the internal reference voltage.

When the divided output drops below the reference volt-

age, the charge pump is enabled, which boosts the output

back into regulation. Hysteresis in the comparator forces

the regulator to burst on and off and causes approximately

100mV of peak-to-peak ripple to appear at the output. By

enabling the charge pump only when needed, the parts

achieve high efficiencies with low output load currents.

Each part’s charge pump has a unique architecture that

allows the input voltage to be either stepped up or stepped

down to produce a regulated output. Internal circuitry

senses the VIN to VOUT differential voltage and controls the

charge pump operating mode. In addition, the effective

output impedance of the charge pump is internally

adjusted to prevent large inrush currents and allow for a

wide input voltage range. When the input voltage is lower

than the output voltage, the charge pump operates as a

step-up voltage doubler. When the input voltage is greater

than the output, the charge pump operates as a step-down

gated switch.

–

VOS

1.232V

VREF

650kHz

OSCILLATOR

RESET

COUNTER

STEP-UP/STEP-DOWN

CHARGE PUMP

VIN

SHDN

POR

GND

C1–

C1+

VOUT

(LTC1515-X)

LTC1515 • BD

(LTC1515)

5/3

(LTC1515-X)

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