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L6732_0906 Datasheet(PDF) 11 Page - STMicroelectronics

Part # L6732_0906
Description  Adjustable step-down controller with synchronous rectification
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6732_0906 Datasheet(HTML) 11 Page - STMicroelectronics

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Device description
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5
Device description
5.1
Oscillator
The switching frequency can be fixed to two values: 250KHz or 500KHz by setting the proper
voltage at the EAREF pin (see Table 3. Pins function and section 4.3 Internal and external
reference).
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 (Figure 3.).
The LDO can be by-passed, providing directly a 5V voltage to VCCDR. In this case VCC and
VCCDR pins must be shorted together as shown in Figure 4. VCCDR pin must be filtered with at
least 1µF capacitor to sustain the internal LDO during the recharge of the bootstrap capacitor.
VCCDR also represents a voltage reference for PGOOD pin (see Table 3. Pins Function).
Figure 3.
LDO block diagram.
LDO
4.5
÷14V


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