L6928(2006) 查看數據表（PDF） - STMicroelectronics
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L6928 Datasheet PDF : 16 Pages
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L6928
1
Pin settings
1.1
Pin connection
Figure 1. Pin connection (top view)
RUN
COMP
VFB
GND
1
8
2
7
3
6
4
5
D01IN1239AMOD
PGOOD
SYNC
VCC
LX
Pin settings
1.2
Pin description
Table 1. Pin description
Pin N° Name
Description
1
RUN
Shutdown input. When connected to a low level (lower than 0.4V) the device
stops working. When high (higher than 1.3V) the device is enabled.
2
COMP
Error amplifier output. A compensation network has to be connected to this pin.
Usually a 220pF capacitor is enough to guarantee the loop stability.
3
VFB
Error amplifier inverting input. The output voltage can be adjusted from 0.6V up
to the input voltage by connecting this pin to an external resistor divider.
4
GND Ground.
5
LX
Switch output node. This pin is internally connected to the drain of the internal
switches.
Input voltage. The start up input voltage is 2.2V (typ) while the operating input
6
VCC voltage range is from 2V to 5.5V. An internal UVLO circuit realizes a 100mV
(typ.) hysteresis.
Operating mode selector input. When high (higher than 1.3V) the Low
Consumption Mode is selected. When low (lower than 0.5V) the Low Noise
7
SYNC Mode is selected. If connected with an appropriate external synchronization
signal (from 500KHz up to 1.4MHz) the internal synchronization circuit is
activated and the device works at the same switching frequency.
Power good comparator output. It is an open drain output. A pull-up resistor
should be connected between PGOOD and VOUT (or VCC depending on the
8 PGOOD requirements). The pin is forced low when the output voltage is lower than 90%
of the regulated output voltage and goes high when the output voltage is greater
than 90% of the regulated output voltage. If not used the pin can be left floating.
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