L6926(2004) 查看數據表（PDF） - STMicroelectronics
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L6926 Datasheet PDF : 11 Pages
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L6926
7
SYNC 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 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.
8
PGOOD 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 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.
Table 5. Electrical Characteristics (Tj = 25°C, VCC = 3.6V unless otherwise specified)
Symbol
Parameter
Test Condition
Min
Typ
Max
Vcc
Operating input voltage
After Turn on
2
5.5
Vcc ON Turn On threshold
2.2
Vcc OFF Turn Off threshold
2
Vcc hys Hysteresis
100
Rp
High side Ron
Vcc = 3.6V, Ilx =100mA
240
Rn
Low side Ron
Vcc = 3.6V, Ilx =100mA
215
Ilim
Peak current limit
Vcc = 3.6V
1.2
Valley current limit
Vcc = 3.6V
1.4
Vout
Output voltage range
Vfb
Vcc
fosc
Oscillator frequency
600
fsync
Sync mode clock (*)
500
1400
DC CHARACTERISTICS
Iq
Quiescent current (low noise
Vsync = 0V, no load, VFB >
230
mode)
0.6V
Quiescent current (low
Vsync = Vcc, no load, VFB
25
cunsumption mode)
> 0.6V
Ish
Shutdown current
RUN to GND, Vcc = 5.5V
0.2
Ilx
LX leakage current (*)
RUN to GND, VLX = 5.5V,
1
Vcc = 5.5V
RUN to GND, VLX = 0V,
1
Vcc = 5.5V
ERROR AMPLIFIER CHARACTERISTICS
Vfb
Voltage feedback
0.593 0.6 0.607
Ifb
Feedback input current (*)
VFB = 0.6V
25
RUN
Vrun_H RUN threshold high
1.3
Vrun_L RUN threshold low
0.4
Irun
RUN input current (*)
25
SYNC/MODE FUNCTION
Vsync_H Sync mode threshold high
1.3
Vsync_L Sync mode threshold low
0.5
PGOOD SECTION
Unit
V
V
V
mV
mΩ
mΩ
A
A
V
KHz
KHz
µA
µA
µA
µA
µA
V
nA
V
V
nA
V
V
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