Product Specification

IXD1701

PS034001-0515

PRELIMINARY

9

BASIC OPERATION

The Error Amplifier of the IXD1701 series monitors output voltage divided by internal resistors R1 & R2 and

compares it with the internal Reference Voltage (see Block Diagram above). The output signal from error amplifier

regulator.

The Current Limit/Short Protection circuits monitor level of the output current, and Thermal shutdown circuit

monitors MOSFET junction temperature to prevent IC damage by excessive current.

The CE pin allows shutdown internal circuitry to minimize power consumption.

Current Limiter, Short-Circuit Protection

The IXD1701 series have a current limiter circuit & a fold back circuit, which aid the operations of the current limiter

and circuit protection. When the load current reaches the current limit level, the fixed current limiter circuit activates

and output voltage drops. Because of this drop, the fold back circuit activates too, and output voltage drops further

decreasing output current. When the output pin is shorted, a current of about 30 mA flows.

Thermal Shutdown

When the junction temperature of the built-in transistor reaches the temperature limit, the thermal shutdown circuit

activates and turns transistor OFF. The IC resumes normal operation when the junction temperature falls below

value determined by Thermal Shutdown Hysteresis.

CE Pin

The CE pin allows shutdown internal circuitry to minimize power consumption. In shutdown mode, output at the

Note that the CE input is active HIGH and has no pull down resistor. IC will be in undefined state, if CE pin is open.

Minimum Operating Voltage

The input voltage should be above 2.0 V for the stable IC operation.

TYPICAL APPLICATION CIRCUIT

LAYOUT AND USE CONSIDERATIONS

1.

Mount external component as close to the IC as possible and use thick, short connecting traces to

reduce the circuit impedance.

2.

The IC may malfunction if absolute maximum ratings are exceeded.

3.

used to prevent oscillations.

4.

The internal phase compensation guarantees the IXD1701 stable operations even without load

improve regulator

’s dynamic characteristics, reducing over/undershoot at heavy load.

5.

In case of high output current, increasing the input capacitor value can stabilize operations.

6.

dissipation value of the package shown at ABSOLUTE MAXIMUM RATING table to not exceed it.

7.

If IC is operates at high temperature with no load, the output voltage may increase beyond nominal

range.