Datasheet

L6730 - L6730B Device description
Doc ID 11938 Rev 3 15/52
5.2 Internal LDO
An internal LDO supplies the internal circuitry of the device. The input of this stage is the
V
CC
pin and the output (5 V) is the V
CCDR
pin (see Figure 5).
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 V
CCDR
. In this case Vcc and
V
CCDR
pins must be shorted together as shown in Figure 6. V
CCDR
pin must be filtered with
at least 1 μF capacitor to sustain the internal LDO during the recharge of the bootstrap
capacitor. V
CCDR
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
≈ 5 V the internal LDO works in dropout with an output resistance of about 1 Ω.
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.
Figure 5. LDO block diagram
LDO
4.5V÷14V