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参数资料
| 型号： | LTC3709EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 200kHz |
| 占空比： | 90% |
| 电源电压： | 5 V ~ 36 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 ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3709
PI FU CTIO S
(QFN/SSOP)
NC (Pin 12/Pins 1, 17, 18, 19, 20): No Connect.
V CC (Pin 17/Pin 25): Main Input Supply. Decouple this pin
to SGND with an RC filter (1 ? , 0.1 μ F).
DRV CC (Pin 21/Pin 29): Driver Supply. Provides supply to
the driver for the bottom gate. Also used for charging the
bootstrap capacitor.
BG1, BG2 (Pins 22, 20/Pins 30, 28): Bottom Gate Drive.
Drives the gate of the bottom N-channel MOSFET between
ground and DRV CC .
PGND1, PGND2 (Pins 23, 19/Pins 31, 27): Power Ground.
Connect this pin closely to the source of the bottom N-
channel MOSFET, the (–) terminal of C DRVCC and the (–) ter-
minal of C IN .
SENSE1 – , SENSE2 – (Pins 24, 18/Pins 32, 26): Current
Sense Comparator Input. The (–) input to the current
comparator is used to accurately Kelvin sense the bottom
side of the sense resistor or MOSFET.
SENSE1 + , SENSE2 + (Pins 25, 16/Pins 33, 24): Current
Sense Comparator Input. The (+) input to the current
comparator is normally connected to the SW node unless
using a sense resistor (see Applications Information).
SW1, SW2 (Pins 26, 15/Pins 34, 23): Switch Node. The
(–) terminal of the bootstrap capacitor C B connects here.
This pin swings from a Schottky diode voltage drop below
ground up to V IN .
TG1, TG2 (Pins 27, 14/Pins 35, 22): Top Gate Drive.
Drives the top N-channel MOSFET with a voltage swing
equal to DRV CC superimposed on the switch node voltage
SW.
BOOST1, BOOST2 (Pins 28, 13/Pins 36, 21): Boosted
Floating Driver Supply. The (+) terminal of the bootstrap
capacitor C B connects here. This pin swings from a diode
voltage drop below DRV CC up to V IN + DRV CC .
PGOOD (Pin 29/Pin 2): Power Good Output. Open-drain
logic output that is pulled to ground when output voltage
is not within ± 10% of the regulation point. The output
voltage must be out of regulation for at least 100 μ s before
the power good output is pulled to ground.
I ON (Pin 30/Pin 3): On-Time Current Input. Tie a resistor
from V IN to this pin to set the one-shot timer current and
thereby set the switching frequency.
FCB (Pin 31/Pin 4): Forced Continuous and External Clock
Input. Tie this pin to ground to force continuous synchro-
nous operation or to V CC to enable discontinuous mode
operation at light load. Feeding an external clock signal
into this pin will synchronize the LTC3709 to the external
clock and enable forced continuous mode.
V RNG (Pin 32/Pin 5): Sense Voltage Range Input. The volt-
age at this pin is ten times the nominal sense voltage at maxi-
mum output current and can be programmed from 0.5V to
2V. The sense voltage defaults to 70mV when this pin is tied
to ground, 140mV when tied to V CC .
3709fb
8
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