LTC1682CS8 datasheet(5/12 Pages) LINER

5 / 12 page

LTC1682/LTC1682-3.3/LTC1682-5

VOUT (Pin 1): Low Noise Regulated Output Voltage. VOUT

should be bypassed with a

≥2µF low ESR capacitor as

close to the pin as possible for best performance. The VOUT

range is 2.5V to 5.5V.

SHDN (Pin 2): Shutdown Input. A logic low on the SHDN

pin puts the part in shutdown mode. A logic high enables

the part. To continuously enable the part connect SHDN to

VIN. When the part is in shutdown, VOUT will be connected

to ground via a 100

Ω switch and CPO will be high

impedance disconnected from VIN.

FB (Pin 3) (LTC1682): The voltage on this pin is compared

to the internal reference voltage (1.235V) by the error

amplifier to keep the output in regulation. An external

resistor divider is required between VOUT and FB to adjust

the output voltage.

FILT (Pin 3) (LTC1682-3.3/LTC1682-5): This pin is used

to filter the internal voltage reference. Typically a 1nF

capacitor is connected from FILT to ground.

GND (Pin 4): System Ground.

C – (Pin 5): Flying Capacitor Negative Input.

VIN (Pin 6): Input Voltage, 1.8V to 4.4V. VIN should be

bypassed with a

≥2µF low ESR capacitor as close to the

pin as possible for best performance. A minimum capaci-

tance value of 0.1

µF is required.

C+ (Pin 7): Flying Capacitor Positive Input.

CPO (Pin 8): Unregulated Charge Pump Output Voltage.

Approximately 1.95(VIN) at low loads. Bypass with a ≥ 2µF

low ESR capacitor. If a minimum VOUT enable time is

required, the CPO capacitor should be 2

× the VOUT

capacitor.

PIN FUNCTIONS

TEMPERATURE (

°C)

–50

5.030

5.020

5.010

5.000

4.990

3.340

3.330

3.320

3.310

3.300

3.290

1.238

1.240

1.236

1.234

1682 G09

–25

125

100

LTC1682

LTC1682-3.3

LTC1682-5

VIN = 3V

IOUT = 10mA

VOUT Voltage vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

OUTPUT CURRENT (mA)

4.994

4.993

3.300

4.997

4.996

4.995

5.000

4.999

4.998

40 45 50

1682 G10

3.299

3.298

3.297

3.296

3.295

3.294

510

30 35

VIN = 3.3V

TA = 25°C

LTC1682-5

LTC1682-3.3

VOUT Voltage vs Output Current

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