参数资料
| 型号： | LTC3608IWKG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 8A 52QFN |
| 特色产品： | 8A, 18V Synchronous Step-Down Regulator |
| 标准包装： | 45 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 17.8 V |
| 输入电压： | 4 V ~ 18 V |
| PWM 型： | 电流模式 |
| 电流 - 输出： | 8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 52-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 52-QFN（7x8）裸露焊盘 |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3608
PIN FUNCTIONS
PV IN (Pins 1, 2, 3, 4, 5, 6, 7, 48, 49, 50, 51, 52, 53):
Main Input Supply. Decouple this pin to power PGND with
the input capacitance, C IN
SW (Pins 8, 33, 41, 42, 43, 44, 45, 46, 47, 55): Switch
Node Connection to the Inductor. The (–) terminal of the
bootstrap capacitor, C B , also connects here. This pin swings
from a diode voltage drop below ground up to V IN .
SGND (Pins 10, 14, 15, 20, 26, 27, 54): Signal Ground. All
small-signal components and compensation components
should connect to this ground, which in turn connects to
PGND at one point.
BOOST (Pin 11): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor, C B , connects here.
This pin swings from a diode voltage drop below INTV CC
up to V IN + INTV CC .
RUN/SS (Pin 12): Run Control and Soft-Start Input. A
capacitor to ground at this pin sets the ramp time to full
output current (approximately 3s/μF) and the time delay
for overcurrent latchoff (see Applications Information).
Forcing this pin below 0.8V shuts down the device.
V ON (Pin 13): On-Time Voltage Input. Voltage trip point for
the on-time comparator. Tying this pin to the output volt-
age or an external resistive divider from the output makes
the on-time proportional to V OUT . The comparator input
defaults to 0.7V when the pin is grounded and defaults to
2.4V when the pin is tied to INTV CC . Tie this pin to INTV CC
in high V OUT applications to use a lower R ON value.
PGOOD (Pin 16): Power Good Output. Open-drain logic
output that is pulled to ground when the output voltage
is not within ± 10% of the regulation point.
V RNG (Pin 17): Current Limit Range Input. The voltage at
this pin adjusts maximum valley current and can be set
from 0.5V to 0.7V by a resistive divider from INTV CC . It
defaults to 0.7V if the V RNG pin is tied to ground which
results in a typical 16A current limit.
I TH (Pin 18): Current Control Threshold and Error Amplifier
Compensation Point. The current comparator threshold
increases with this control voltage. The voltage ranges
from 0V to 2.4V with 0.8V corresponding to zero sense
voltage (zero current).
FCB (Pin 19): Forced Continuous Input. Tie this pin to
ground to force continuous synchronous operation at low
load, to INTV CC to enable discontinuous mode operation at
low load or to a resistive divider from a secondary output
when using a secondary winding.
NC (Pins 9, 21, 24, 25, 28): No Connection.
I ON (Pin 22): 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.
V FB (Pin 23): Error Amplifier Feedback Input. This pin
connects the error amplifier input to an external resistive
divider from V OUT .
EXTV CC (Pin 29): External V CC Input. When EXTV CC exceeds
4.7V, an internal switch connects this pin to INTV CC and
shuts down the internal regulator so that controller and
gate drive power is drawn from EXTV CC . Do not exceed
7V at this pin and ensure that EXTV CC < V IN .
SV IN (Pin 30): Supply Pin for Internal PWM Controller.
INTV CC (Pins 31, 32): Internal 5V Regulator Output. The
driver and control circuits are powered from this voltage.
Decouple this pin to power ground with a minimum of
4.7μF low ESR tantalum or ceramic capacitor.
PGND (Pins 34, 35, 36, 37, 38, 39, 40): Power Ground.
Connect this pin closely to the (–) terminal of C VCC and
the (–) terminal of C IN .
3608fc
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