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参数资料
| 型号： | LTC3853IUJ#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.15 A DUAL SWITCHING CONTROLLER, 830 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, PLASTIC, QFN-40 |
| 文件页数： | 35/36页 |
| 文件大小： | 1780K |
| 代理商： | LTC3853IUJ#TR |
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LTC3853
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PIN FUNCTIONS
SENSE1+,SENSE2+,SENSE3+(Pins3,5,7):CurrentSense
ComparatorInputs.The(+)inputstothecurrentcompara-
tors are normally connected to DCR sensing networks or
current sensing resistors. SENSE3+ common modes up
to 13.5V, allowing higher VOUT voltages on channel 3.
SENSE1–, SENSE2–, SENSE3– (Pins 4, 6, 8): Current
Sense Comparator Inputs. The (–) inputs to the current
comparatorsareconnectedtotheoutputs.SENSE3–com-
mon modes up to 13.5V, allowing higher VOUT voltages
on channel 3.
VFB1,VFB2,VFB3(Pins9,12,14):ErrorAmplifierFeedback
Inputs. These pins receive the remotely sensed feedback
voltages for each channel from external resistive dividers
across the outputs. Connecting VFB2toVINthrougha200k
resistor enables dual output (2 + 1) mode.
ITH1, ITH2, ITH3 (Pins 10, 13, 15): Current Control Thresh-
olds and Error Amplifier Compensation Points. Each as-
sociated channels’ current comparator tripping threshold
increases with its ITH control voltage. In dual output (2 +
1) mode, ITH1 and ITH2 need to be shorted externally.
SGND (Pin 11): Signal Ground. All small-signal compo-
nents and compensation components should connect
to this ground, which in turn connects to PGND at one
point.
PGOOD3 (Pin 16): Power Good Indicator Output for Phase
3. Open-drain logic out that is pulled to ground when any
channeloutputexceedsthe±7.5%regulationwindow,after
the internal 17s power bad mask timer expires.
PGOOD12 (Pin 17): Power Good Indicator Output for
Phases 1 and 2. Open-drain logic out that is pulled to
ground when any channel output exceeds the ±7.5%
regulation window, after the internal 17s power bad
mask timer expires.
INTVCC (Pin 22): Internal 5V Regulator Output. The
control circuits are powered from this voltage. Also
provides channel 3 driver power. Decouple this pin to
PGND with a minimum of 4.7F low ESR tantalum or
ceramic capacitor.
EXTVCC(Pin23):ExternalPowerInputtoanInternalSwitch
Connected to INTVCC. This switch closes and supplies the
IC power, bypassing the internal low dropout regulator,
whenever EXTVCC is higher than 4.7V. Do not exceed 6V
on this pin and ensure VIN > VEXTVCC at all times.
VIN (Pin 24): Main Input Supply. Decouple this pin to
PGND with a capacitor (0.1F to 1F).
DRVCC12(Pin29):DriverVoltageInputforChannels 1and
2. Do not exceed 6V on this pin. This pin must be tied to
INTVCC externally.
BG1, BG2, BG3 (Pins 30, 28, 21): Bottom Gate Driver
Outputs.ThesepinsdrivethegatesofthebottomN-channel
MOSFETs between PGND and INTVCC/DRVCC12.
SW1, SW2, SW3 (Pins 31, 27, 20): Switch Node Con-
nections to Inductors. Voltage swing at these pins is from
a Schottky diode (external) voltage drop below ground
to VIN.
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