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| L6730_09 Datasheet, PDF (15/52 Pages) STMicroelectronics – Adjustable step-down controller with synchronous rectification | |||
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L6730 - L6730B
Device description
5.2
Internal LDO
An internal LDO supplies the internal circuitry of the device. The input of this stage is the
VCC pin and the output (5 V) is the VCCDR pin (see Figure 5).
Figure 5. LDO block diagram
4.5V÷14V
LDO
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
The LDO can be by passed by providing 5 V voltage directly to VCCDR. In this case Vcc and
VCCDR pins must be shorted together as shown in Figure 6. VCCDR pin must be filtered with
at least 1 μF capacitor to sustain the internal LDO during the recharge of the bootstrap
capacitor. VCCDR also represents a voltage reference for Tmask pin, S/O/U pin (L6730) or
CC/O/U pin (L6730B) and PGOOD pin (see Table 4: Pin connection).
If Vcc â 5 V the internal LDO works in dropout with an output resistance of about 1 â¦.
The maximum LDO output current is about 100 mA, and so the output voltage drop can be
100 mV. The LDO can be bypassed to avoid this.
Doc ID 11938 Rev 3
15/52
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