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参数资料
| 型号： | LTC3829EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/40页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 94% |
| 电源电压： | 4.5 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3829
PIN FUNCTIONS
(UHF/FE)
ISET (Pin 15/Pin 17): Stage Shedding Comparator and
Burst Mode Comparator Programming Pin. A resistor to
ground programs the stage shedding comparator threshold
or Burst Mode comparator threshold and its current limit
depending on MODE pin setting.
I LIM (Pin 16/Pin 18): Current Comparator Sense Voltage
Range Pin. This pin is to be programmed to SGND, FLOAT
or INTV CC to set the maximum current sense threshold to
one of three different levels for each comparator.
PGOOD (Pin 17/Pin 19): Power Good Indicator Output.
Open-drain logic out that is pulled to ground when the
output exceeds ±10% regulation window after the internal
100μs power bad mask timer expires.
PLLIN (Pin 18/Pin 20): External Synchronization Pin. A
clock on the pin synchronizes the internal oscillator with
the clock on this pin.
EXTV CC (Pin 23/Pin 25): External Power Input to an
Internal Switch Connected to INTV CC . This switch closes
and supplies the IC power, bypassing the internal low
dropout regulator, whenever EXTV CC is higher than 4.7V.
Do not exceed 6V on this pin and ensure V IN > V EXTVCC
at all times.
INTV CC (Pin 24/Pin 26): Internal 5V Regulator Output. The
control circuits are powered from this voltage. Decouple
this pin to PGND with a minimum of 4.7μF low ESR tan-
talum or ceramic capacitor.
V IN (Pin 25/Pin 27): Main Input Supply. Decouple this pin
to PGND with a capacitor (0.1μF to 1μF).
BG1, BG2, BG3 (Pins 30, 29, 22/Pins 32, 31, 24): Bottom
Gate Driver Outputs. These pins drive the gates of the bot-
tom N-channel MOSFETs between PGND and INTV CC .
SW1, SW2, SW3 (Pins 31, 28, 21/Pins 33, 30, 23):
Switch Node Connections to Inductors. Voltage swing
at these pins is from a Schottky diode (external) voltage
drop below ground to V IN .
TG1, TG2, TG3 (Pins 32, 27, 20/Pins 34, 29, 22): Top Gate
Driver Outputs. These are the outputs of floating drivers
with a voltage swing equal to INTV CC superimposed on
the switch nodes voltages.
BOOST1, BOOST2, BOOST3 (Pins 33, 26, 19/Pins 35,
28, 21): Boosted Floating Driver Supplies. The (+) terminal
of the bootstrap capacitors connect to these pins. These
pins swing from a diode voltage drop below INTV CC up
to V IN + INTV CC .
CLKOUT (Pin 34/Pin 36): Clock Output Pin. CLKOUT is
60° out of phase relative to channel 1 in non-shedding
mode. During stage shedding, CLKOUT is 180° out of
phase with channel 1.
MODE (Pin 35/Pin 37): Forced Continuous Mode, Burst
Mode or Shed Mode Selection Pin. Connect this pin to
SGND to force IC in continuous mode of operation. Con-
nect to INTV CC to enable shed mode operation. Leave the
pin floating to enable Burst Mode operation.
IFAST (Pin 36/Pin 38): Programmable Pin for Nonlinear
Control Trip Threshold. A resistor to ground programs the
tripping threshold for nonlinear control circuit. Connect
this pin to INTV CC to disable this feature. See Applications
Information section for details. Leave this pin floating
when it is not used.
ITEMP (Pin 37/Pin 1): Input of the Temperature Sensing
Comparator. Connect this pin to external NTC resistors
placed near inductors.
DIFFOUT (Pin 38/Pin 2): Output of Remote Sensing
Differential Amplifier. Connect this pin to V FB through a
resistive divider.
SGND/PGND (Exposed Pad Pin 39/Exposed Pad Pin 39):
Combined Signal and Power Ground Pad. Connect this pad
closely to the sources of the bottom N-channel MOSFETs,
the (–) terminal of C VCC and the (–) terminal of C IN . All
small-signal components and compensation components
should also Kelvin-connect to this pad.
3829fa
For more information www.linear.com/LTC3829
9
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