Analog Devices DC353A Manual de usuario

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DC353A DEMO BOARD QUICK START GUIDE

DESCRIPTION

Demonstration circuit DC353A demonstrates the capabilities of the LTC1928-5 doubler

charge pump and linear regulator. The board contains the following:

• LTC1928-5 doubler charge pump with low noise linear regulator.

• 4.7µF ceramic capacitor on VOUT

• 4.7µF ceramic capacitor on CPO

• 4.7µF ceramic capacitor on VIN

• 0.47µF ceramic capacitor between CP and CN/SHDNB

• N-channel FET type 2N7002 to supply an open-drain pulldown during shutdown

• 50Ωtermination resistor at the gate of the 2N7002 FET

• A 100Ωcurrent-limit resistor between the drain of the 2N7002 FET and the

CN/SHDNB pin

The LTC1928-5 generates a low noise regulated 5V output from a DC input supply

voltage connected to the VIN terminal. The DC supply voltage range is 2.7V to 4.4V. The

small SOT-23 package and small ceramic capacitors minimize board space requirements.

A power supply connected to VIN is the only requirement for basic operation of the demo

board. The termination resistor at the gate of the 2N7002 keeps this FET off and the

LTC1928-5 out of shutdown (enabled).

EXTERNAL CONNECTIONS

Refer to Figure 1 for proper power supply and test equipment setup.

Connect a 2.7V to 4.4V DC voltage supply to the VIN terminal.

Connect the DC supply ground to the GND terminal.

Connect a pulse generator switching from 0V to 5V to the SHDN terminal (optional).

The part will be enabled when the pulse generator signal is low and disabled when the

pulse generator signal is high. If the pulse generator is not connected the part will be

enabled.

Connect the load between the VOUT and GND terminals directly at the board if noise

measurements are being performed.sdfsdfasdf

+

–

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–

–

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–

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LOAD

GND

VIN

VOUT SHDN

LTC1928S6-5

DEMO CIRCUIT 353A

LOW NOISE BOOST

DC/DC CONVERTER

Figure 1. DC353 Test and Measurement Setup

OPERATING MODES

DC353A is designed to demonstrate the low noise performance of the LTC1928-5 as well

as its shutdown and current-drive capabilities.

Enable Mode

The device is enabled when the SHDN signal is at 0V. VOUT will be between 4.9V and

5.1V. Noise measurements can be performed as outlined in the LTC1928-5 data sheet.

Loads should be applied between the VOUT and the GND terminals on the demo board to

avoid ground loops. Ground loops could result in excessive noise generation. A variable

resistor or current source can be applied to the VOUT terminal to characterize the output

current drive capabilities.

Shutdown Mode

The 2N7002 FET is required to place the LTC1928-5 in shutdown. Shutdown is achieved

by applying five volts to the SHDN terminal which turns the 2N7002 on. The 50Ω

termination resistor at the SHDN terminal minimizes ringing when the user controls

shutdown using a pulse generator. The pulse generator can be set to switch between 0V

and 5V. The enable and disable characteristics can be determined by obserVINg the

output voltage at VOUT and the input current at VIN. The pulse generator frequency will be

in the 100s of Hertz range. When the part is disabled, VOUT will be discharged to ground

via an internal pull down transistor. The data sheet contains example waveforms showing

the on and off characteristics of VOUT. In actual applications, the 2N7002 can be replaced

with an open-drain transistor associated, for example, with a system controller.