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L6730 датащи(PDF) 14 Page - STMicroelectronics

номер детали L6730
подробное описание детали  Adjustable step-down controller with synchronous rectification
PDF  52 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6730 датащи(HTML) 14 Page - STMicroelectronics

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Device description
L6730 - L6730B
14/52
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 (5V) is the VCCDR pin (see Figure 4.).
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
The LDO can be by passed by providing 5V voltage directly to VCCDR. In this case Vcc and
VCCDR pins must be shorted together as shown in Figure 5. 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 3: Pins connection).
If Vcc
5V the internal LDO works in dropout with an output resistance of about 1Ω.
The maximum LDO output current is about 100mA, and so the output voltage drop can be
100mV.
The LDO can be bypassed to avoid this.
Figure 4.
LDO block diagram.
Figure 5.
Bypassing the LDO
LDO
4.5V
÷14V



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