BM1117 查看數據表（PDF） - Unspecified

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BM1117

Voltage Regulators

Unspecified 

SPECIFICATION

Parameter

Device

Conditions

BM1117

Min Typ Max Units

Long Term

Stability

TA =125°C, 1000Hrs

0.3

1

%

RMS Output Noise

(% of VOUT )

Thermal

TA=25°C, 10Hz ≤f ≤10kHz

0.003

%

Resistance

15 °C/W

Junction-to-Case

Parameters identified with boldface type apply over the full operating temperature range.

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For

guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications

apply only for the test conditions listed.

Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W. Power

dissipation is determined by the input/output differential and the output current. Guaranteed maximum power

dissipation will not be available over the full input/output range.

Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and

load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load

regulation is measured at the output lead ~1/8” from the package.

Note 4: Dropout voltage is specified over the full output current range of the device.

Note 5: Minimum load current is defined as the minimum output current required to maintain regulation.

When 1.5V≤ (VIN - VOUT) ≤12V the device is guaranteed to regulate if the output current is greater than

10mA.

APPLICATION HINTS

The BM1117 series of adjustable and fixed regulators are easy to use and are protected against

short circuit and thermal overloads. Thermal protection circuitry will shut-down the regulator

should the junction temperature exceed 165°C at the sense point.

Pin compatible with older three terminal adjustable regulators, these devices offer the

advantage of a lower dropout voltage, more precise reference tolerance and improved

reference stability with temperature.

Stability

The circuit design used in the BM1117

To ensure good transient response with

series requires the use of an output

heavy load current changes capacitor

capacitor as part of the device frequency

values on the order of 100mF are used in

compensation. The addition of 22µF solid

the output of many regulators. To further

tantalum on the output will ensure stability

improve stability and transient response

for all operating conditions.

of these devices larger values of output

When the adjustment terminal is bypassed

capacitor can be used.

with a capacitor to improve the ripple

Protection Diodes

rejection, the requirement for an output

Unlike older regulators, the BM1117

capacitor increases. The value of 22µF

family does not need any protection

tantalum covers all cases of bypassing the

diodes between the adjustment pin and

adjustment terminal. Without bypassing the

the output and from the output to the

adjustment terminal smaller capacitors can

input to prevent over-stressing the die.

be used with equally good results.

Internal resistors are limiting the internal

BOOKLY MICRO ELECTRONICS LIMITED CORP.

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