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参数资料
| 型号： | LTM4600IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC UMODULE 10A 104-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC |
| 软件下载： | LTM4600 Spice Model |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | DC823B-A Design Files LTM4600IV#PBF Footprint.bxl |
| 特色产品： | μModule Products |
| 标准包装： | 119 |
| 系列： | µModule® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 4.5V |
| 电压 - 输入（最大）： | 20V |
| Voltage - Output 1： | 0.6 ~ 5 V |
| 电流 - 输出（最大）： | 10A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 104-LGA |
| 尺寸/尺寸： | 0.59" L x 0.59" W x 0.11" H（15.0mm x 15.0mm x 2.8mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 92% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
| 配用： | DC823B-A-ND - BOARD EVAL LTM4600 |
LTM4600
APPLICATIONS INFORMATION
time to charge up the output capacitor, C SS is used as a
short-circuit timer. After the RUN/SS pin charges above 4V,
if the output voltage falls below 75% of its regulated value,
then a short-circuit fault is assumed. A 1.8μA current then
3V
4V
V RUN/SS
3.5V
begins discharging C SS . If the fault condition persists until
the RUN/SS pin drops to 3.5V, then the controller turns
off both power MOSFETs, shutting down the converter
permanently. The RUN/SS pin must be actively pulled
down to ground in order to restart operation.
1.5V
SOFT-START
CLAMPING
OF I L RELEASED
SHORT-CIRCUIT
LATCH ARMED
OUTPUT
OVERLOAD
HAPPENS
SHORT-CIRCUIT
LATCHOFF
t
The over-current protection timer requires the soft-start
timing capacitor C SS be made large enough to guarantee
that the output is in regulation by the time C SS has reached
V O
75%V O
the 4V threshold. In general, this will depend upon the size
of the output capacitance, output voltage and load current
characteristic. A minimum external soft-start capacitor
can be estimated from:
SWITCHING
STARTS
Figure 3. RUN/SS Pin Voltage During Startup and
Short-Circuit Protection
t
4600 F03
C SS
EXT
+ 1000pF > C OUT ? V OUT (10 –3 [F / V S ])
V IN
V IN
Generally 0.1μF is more than suf?cient.
Since the load current is already limited by the current
mode control and current foldback circuitry during a
shortcircuit, over-current latchoff operation is NOT always
needed or desired, especially if the output has a large
amount of capacitance or the load draws huge currents
during start up. The latchoff feature can be overridden
R RUN/SS
LTM4600
RUN/SS
PGND SGND
4600 F04
RECOMMENDED VALUES FOR R RUN/SS
V IN R RUN/SS
4.5V TO 5.5V 50k
by a pull-up current greater than 5μA but less than 80μA
to the RUN/SS pin. The additional currents prevents the
10.8V TO 13.8V
16V TO 20V
150k
330k
discharge of C SS during a fault and also shortens the soft-
start period. Using a resistor from RUN/SS pin to V IN is
a simple solution to defeat latchoff. Any pull-up network
must be able to maintain RUN/SS above 4V maximum
latchoff threshold and overcome the 4μA maximum dis-
charge current. Figure 3 shows a conceptual drawing of
V RUN during startup and short circuit.
Figure 4. Defeat Short-Circuit Latchoff with a Pull-Up
Resistor to V IN
Enable
The RUN/SS pin can be driven from logic as shown in
Figure 5. This function allows the LTM4600 to be turned
on or off remotely. The ON signal can also control the
sequence of the output voltage.
RUN/SS
ON
LTM4600
PGND SGND
2N7002
4600 F05
Figure 5. Enable Circuit with External Logic
4600fc
12
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相关代理商/技术参数 |
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| LTM4601 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC μModule Regulator |
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