SPECIFICATION

BM1117

BOOKLY MICRO ELECTRONICS LIMITED CORP.

Parameter

Device

Conditions

Min

Typ

Max

Units

Long Term

Stability

0.3

1

%

RMS Output Noise

0.003

%

Thermal

Resistance

Junction-to-Case

15

°C/W

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

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

series requires the use of an output

capacitor as frequency compensation. The

aluminum on the output will ensure stability

for all operating conditions.

When adjustment terminal is bypassed with

a capacitor to improve ripple rejection, the

requirement for output capacitor increase.

The value of 22µF tantalum or 150uF

aluminum covers all cases of bypassing the

adjustment terminal. Without bypassing the

adjustment terminal smaller capacitors can

be used with equally good results.

To ensure good transient response with

heavy load current changes capacitor

values on the order of 100mF are used in

the output of many regulators. To further

improve stability and transient response

of these devices larger values of output

capacitor can be used.

Protection Diodes

Unlike older regulators, the BM1117

family does not need any protection

diodes between the adjustment pin and

the output and from the output to the

input to prevent over-stressing the die.

Internal resistors are limiting the internal