MIC5256(2003) 查看數據表（PDF） - Micrel

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MIC5256
(Rev.:2003)

150mA µCap LDO with Error Flag

Micrel 

MIC5256

The junction-to-ambient thermal resistance for the minimum

footprint is 235°C/W, from Table 1. The maximum power

dissipation must not be exceeded for proper operation. Using

the output voltage of 3.0V and an output current of 150mA,

the maximum input voltage can be determined. Because this

device is CMOS and the ground current is typically 100µA

over the load range, the power dissipation contributed by the

ground current is < 1% and can be ignored for this calculation.

315mW = (VIN – 3.0V) 150mA

315mW = VIN·150mA – 450mW

810mW = VIN·150mA

VIN(max) = 5.4V

Therefore, a 3.0V application at 150mA of output current can

accept a maximum input voltage of 5.4V in a SOT-23-5

package. For a full discussion of heat sinking and thermal

effects on voltage regulators, refer to the Regulator Thermals

section of Micrel’s Designing with Low-Dropout Voltage Regu-

lators handbook.

Fixed Regulator Applications

47kΩ

VIN

CIN= 1.0µF

Ceramic

MIC5256-x.xBM5

1

5

2

3

4

VOUT

COUT = 1.0µF

Ceramic

Micrel

Figure 1. Low-Noise Fixed Voltage Application

Figure 1 shows a standard low-noise configuration with a

47kΩ pull-up resistor from the error flag to the input voltage

and a pull-down capacitor to ground for the purpose of fault

indication. EN (Pin 3) is connected to IN (Pin 1) for an

application where enable/shutdown is not required. COUT =

1.0µF minimum.

MIC5256

10

June 2003

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