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L6725 数据表(PDF) 11 Page - STMicroelectronics

部件名 L6725
功能描述  Low cost adjustable step-down controller
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6725 数据表(HTML) 11 Page - STMicroelectronics

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L6725
Device description
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5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
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 is 100mV, to
avoid this the LDO can be bypassed.
5.4
Internal and external references
It is possible to set the internal/external reference and the switching frequency by setting the
proper voltage at the EAREF pin. The maximum value of the external reference depends on the
VCC: with VCC = 4V the clamp operates at about 2V (typ.), while with VCC greater than 5V the
maximum external reference is 2.5V (typ.).
VEAREF from 0% to 80% of VCCDR -> External reference/Fsw=250KHz
VEAREF from 80% to 95% of VCCDR -> VREF = 0.6V/Fsw=500KHz
VEAREF from 95% to 100% of VCCDR -> VREF = 0.6V/Fsw=250KHz
Providing an external reference from 0V to 450mV the output voltage will be regulated but
some restrictions must be considered:
The minimum OVP threshold is set at 300mV;
The under-voltage-protection doesn't work;
To set the resistor divider it must be considered that a 100K pull-down resistor is integrated into
the device (see Figure 4.). Finally it must be taken into account that the voltage at the EAREF
pin is captured by the device at the start-up when VCC is about 4V.
Figure 3.
Bypassing the LDO


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