GM66150 데이터 시트보기 (PDF) - Gamma Microelectronics Inc.

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GM66150

1.5A ULTRA LOW DROPOUT VOLTAGE REGULATORS

Gamma Microelectronics Inc. 

2009/5/18

GM66150 Series

1.5A ULTRA LOW DROPOUT VOLTAGE

REGULATORS

Application Information (continued)

Minimum Load Current

The GM66150 regulators are specified between finite loads. If the output current is too small, leakage

currents dominate and the output voltage rises. The 5mA minimum load current swamps any expected

leakage current across the operating temperature range.

Adjustable Regulator Design

The adjustable regulator versions, GM66152 and GM66153, allow programming the output voltage

anywhere between 1.25V and the 26V maximum operating rating of the family. Two resistors are used.

Resistors can be quite large, up to 1M., because of the very high input impedance and low bias current of

the sense comparator: The resistor values are calculated by:

VOUT

R1 = R2 (

– 1)

1.24

Where is VOUT the desired output voltage. Figure 2 shows component definition. Applications with widely

varying load currents may scale the resistors to draw the minimum load current required for proper

operation.

VIN

R1

10µF

R2

VOUT

22µF

Figure 2. Adjustable Regulator with Resistors

Error Flag

GM66151 and GM66153 versions feature an Error Flag, which looks at the output voltage and signals an

error condition when this voltage drops 5% below its expected value. The error flag is an open-collector

output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of

possible problems, including an over-current fault (the device is in current limit) and low input voltage. The

flag output is inoperative during over temperature shutdown conditions.

Enable Input

GM66151 and GM66152 versions feature an enable (EN) input that allows ON/OFF control of the device.

Special design allows œzeroB current drain when the device is disabled#only microamperes of leakage

current flows. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may

be directly tied to ≤ 30V. Enabling the regulator requires approximately 20µA.

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