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L6910 Datasheet(PDF) 7 Page - STMicroelectronics

Part # L6910
Description  ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6910 Datasheet(HTML) 7 Page - STMicroelectronics

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L6910 - L6910A
avoided if the PHASE pin is over about 500mV. The lower mos is in any case turned-on after 200ns from the
high side turn-off.
The peak current is shown for both the upper (fig. 6) and the lower (fig. 7) driver at 5V and 12V. A 3.3nF capac-
itive load has been used in these measurements.
For the lower driver, the source peak current is 1.1A @ VCC = 12V and 500mA @ VCC = 5V, and the sink peak
current is 1.3A @ VCC = 12V and 500mA @ VCC = 5V.
Similarly, for the upper driver, the source peak current is 1.3A @ Vboot-Vphase = 12V and 600mA @ Vboot-
Vphase = 5V, and the sink peak current is 1.3A @ Vboot-Vphase =12V and 550mA @ Vboot-Vphase = 5V.
Figure 6. High Side Driver Peak Current. Vboot-Vphase = 12V (right) Vboot-Vphase = 5V (left)
Figure 7. Low Side Driver Peak Current. VCC = 12V (right) VCC = 5V (left)
4.5 Monitoring and Protections
The output voltage is monitored by means of pin FB. If it is not within ±10% (typ.) of the programmed value, the
powergood output is forced low.
The device provides overvoltage protection, when the voltage sensed on pin FB reaches a value 17% (typ.)
greater than the reference the OSC pin is forced high (3V typ.) and the lower driver is turned on as long as the
over-voltage is detected.
CH1 = High Side Gate CH4 = Gate Current
CH1 = Low Side Gate CH4 = Gate Current


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