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L99VR02XP Datasheet(PDF) 25 Page - STMicroelectronics |
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L99VR02XP Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 50 page  Figure 42. Example of output voltage selection Co1 VS_LDO1 En_LDO1 Ishort_LDO1 RES_LDO2 SEL1_LDO1 OUT_LDO1 Vcw_LDO1 Wi_LDO1 GND SEL2_LDO1 TW_LDO2 SEL3_LDO1 RES_LDO1 En_LDO2 OUT_LDO2 SEL1_LDO2 SEL2_LDO2 SEL3_LDO2 Ishort_LDO2 TW_LDO1 TC_CONF VS_LDO2 VCR_LDO1 VCR_LDO2 Vcw_LDO2 Rsh_LDO2 Rsh_LDO1 Wi_LDO2 Ctr1 Ctr2 C1 C2 Ctw1 Ctw2 Co2 Rrst2 Rrst1 Vbat Ren2 Ren1 Vs1 Vs2 Vo2=2.5V Vo1=2.5V The SELx_LDOy pins are internally connected to GND via pull-down current source. 4.4 Enable The L99VR02XP is enabled/disabled by two independently enable inputs; a high voltage signal switches the regulator ON. When the enabled pins are set to low, the outputs are switched-off, the current consumption of the device becomes as low as 1 μA and the fast output discharge circuit is activated. It may happen that the enable pins must be driven by components supplied at a voltage different from the regulator supply voltage. In this case the EN_LDO1,2 input pins must be set high only once VS > 1.5 V. A solution to drive the enable pin is depicted in the Figure 43. Figure 43. Typical example of enable control VS_LDO1 En_LDO1 Ishort_LDO1 RES_LDO2 SEL1_LDO1 OUT_LDO1 Vcw_LDO1 Wi_LDO1 GND SEL2_LDO1 TW_LDO2 SEL3_LDO1 RES_LDO1 En_LDO2 OUT_LDO2 SEL1_LDO2 SEL2_LDO2 SEL3_LDO2 Ishort_LDO2 TW_LDO1 TC_CONF VS_LDO2 VCR_LDO1 VCR_LDO2 Vcw_LDO2 Rsh_LDO2 Rsh_LDO1 Wi_LDO2 Ctr1 Ctr2 C1 C2 Ctw1 Ctw2 Co2 Rrst2 Rrst1 Co1 Power supply - supply line 1 Ren1 Ren2 Enable supply - supply line 2 Power supply - supply line 1 Enable supply - supply line 3 In any case, since the enable input voltage is linked to the maximum dc supply voltage (VS_LDOy) applied to the L99VR02XP (-0.3 V ≤ VEN_LDO1,2 ≤ + 28 V), special care must be adopted in driving EN_LDO1,2 pins to avoid exceeding the absolute maximum rating. External resistances in a range of 1 kΩ through 33 kΩ can be connected to the EN pins to further limit the current flow. L99VR02XP Application information DS14686 - Rev 1 page 25/50 |
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