HM6119 datasheet(4/7 Pages) HMSEMI

4 / 7 page

DETAILED DESCRIPTION

HM6119 is a series of low dropout voltage and low power consumption regulator. Its application

circuitry requires minimum number of external components. Both fixed voltage and adjustable voltage

application circuits need input and output capacitors to assure output voltage stability. Any desired output

voltage from fixed voltage to 18V can be achieved by assigning proper values to two external resistors in its

application circuitry (as shown in Fig.3, as R1, R2 are the two external resistors.).

HM6119 uses trimming technique to assure the accuracy of output value within ±2%, at the same time,

temperature compensation is elaborately considered in this chip, which makes HM6119’s temperature

coefficient within 100ppm/℃。

TYPICAL APPLICATION

HM6119 has fixed voltage and adjustable voltage application mode, Fig.4 shows their typical application

circuitry.

A 1uF ceramic capacitor connected between input and GND as bypass capacitor and a 1uF ceramic

capacitor between output and GND are recommended for all application.

Using a bypass capacitor (CAdj) between the adjust terminal and ground can improve ripple rejection. The

bypass capacitor prevents ripple from being amplified in case the output voltage is increased. The

impedance of CAdj should be less than the resistance of R1 to prevent ripple from being amplified at any

frequency. As R1 is normally in the range of 1KΩ~10KΩ, the value of CAdj should satisfy the following

condition:

1/(2* FrequencyRipple *Cadj)<R1

A 0.1µF ceramic capacitor is recommended.

Fig 3. Typical Application of HM6119

EXPLANATION

The output voltage of adjustable application satisfies this followed equation:

Vout=VRef× (1+R2/R1)+IAdj×R2.

The second term IAdj×R2 can be ignored since the adjustable pin current IAdj (~ 2µA) is much less than the

current through R1 (~1mA).

The value of R1 is preferred in the range of 1KΩ～10KΩ and the value of VRef is the output voltage of typical

fixed voltage application circuit.

HM6119

HM6119 Datasheet(PDF) 4 Page - Shenzhen Huazhimei Semiconductor Co., Ltd