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LT3032 Series

3032fd

BYPN (Pin 11): Negative Bypass. The BYPN pin is used

to bypass the reference of the negative side regulator to

achieve low noise performance. A small capacitor from

OUTN to this pin will bypass the reference to lower the

output voltage noise. A maximum value of 0.01μF is used

for reducing output voltage noise to a typical 30μVRMS

over the 10Hz to 100kHz bandwidth. If not used, this pin

must be left unconnected.

SHDNP (Pin 12): Positive Shutdown. The SHDNP pin puts

the positive side into a low power shutdown state. The

positive output will be off when the SHDNP pin is pulled

below 0.6V(typical). The SHDNP pin can be driven by 5V

logic or open-collector logic with a pull-up resistor. The

pull-up resistor is required to supply the pull-up current

of the open-collector device, normally several microam-

peres, and the SHDNP pin current, typically 1μA into the

pin. If unused, the SHDNP pin must be connected to INP.

PIN FUNCTIONS

The positive output will be shut down if the SHDNP pin

is open circuit. The SHDNP pin can be tied directly to the

SHDNN pin and both pins driven directly by positive logic

for a single point control of both outputs.

NC (Pin 13/Pins 2, 8 for Fixed Voltage Devices): No

Connect. The No Connect pin has no connection to inter-

nal circuitry and may be tied to INP, GND, INN, SHDNP,

SHDNN, OUTP, OUTN, ﬂoated, or tied to any other point.

INP (Pin 14): Positive Input. Power is supplied to the

positive side of the LT3032 through the INP pin. A bypass

capacitor is required on this pin if it is more than six inches

away from the main input ﬁlter capacitor. In general, the

output impedance of a battery rises with frequency, so

it is advisable to include a bypass capacitor in battery-

powered circuits. A bypass capacitor in the range of 1μF

to 10μF is sufﬁcient.

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