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参数资料
| 型号： | LTM4602EV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC UMODULE 6A 104-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC |
| 软件下载： | LTM4602 Spice Models |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | LTM4602EV#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）： | 6A |
| 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) |
LTM4602
APPLICATIONS INFORMATION
C IN
V IN
PGND
V OUT
to ~1.2MHz for 3.3V, and ~1.7MHz for 5V outputs due
to Frequency = (DC/t ON ) When the switching frequency
increases to 1.2MHz, then the time period t S is reduced
to ~833 nanoseconds and at 1.7MHz the switching period
reduces to ~588 nanoseconds. When higher duty cycle
conversions like 5V to 3.3V and 12V to 5V need to be
accommodated, then the switching frequency can be
lowered to alleviate the violation of the 400ns minimum
off time. Since the total switching period is t S = t ON + t OFF ,
t OFF will be below the 400ns minimum off time. A resistor
from the f ADJ pin to ground can shunt current away from
the on time generator, thus allowing for a longer on time
LOAD
TOP LAYER
4600 F16
and a lower switching frequency. 12V to 5V and 5V to
3.3V derivations are explained in the data sheet to lower
switching frequency and accommodate these step-down
Figure 18. Recommended PCB Layout
from V IN to f ADJ . The on time is equal to t ON = (V OUT /I ON )
? 10pF and t OFF = t s – t ON . The frequency is equal to: Freq.
= DC/t ON . The I ON current is proportional to V IN , and the
regulator duty cycle is inversely proportional to V IN , there-
fore the step-down regulator will remain relatively constant
frequency as the duty cycle adjustment takes place with
lowering V IN . The on time is proportional to V OUT up to a
2.4V clamp. This will hold frequency relatively constant
with different output voltages up to 2.4V. The regulator
switching period is comprised of the on time and off time
as depicted in Figure 19.
conversions.
Equations for setting frequency for 12V to 5V:
I ON = (V IN – 0.7V)/110k; I ON = 103μA
frequency = (I ON /[2.4V ? 10pF]) ? DC = 1.79MHz;
DC = duty cycle, duty cycle is (V OUT /V IN )
t S = t ON + t OFF , t ON = on-time, t OFF = off-time of the
switching period; t S = 1/frequency
t OFF must be greater than 400ns, or t S – t ON > 400ns.
t ON = DC ? t S
1MHz frequency or 1μs period is chosen for 12V to 5V.
(DC) DUTY CYCLE = ON
DC = = OUT
t OFF t ON
t
t s
t ON V
t s V IN
DC
FREQ =
t ON
t ON = 0.41 ? 1μs ? 410ns
t OFF = 1μs – 410ns ? 590ns
t ON and t OFF are above the minimums with adequate guard
4602 F19
PERIOD t s
Figure 19. LTM4602 Switching Period
The LTM4602 has a minimum (t ON ) on time of 100 nanosec-
onds and a minimum (t OFF ) off time of 400 nanoseconds.
The 2.4V clamp on the ramp threshold as a function of
V OUT will cause the switching frequency to increase by the
ratio of V OUT /2.4V for 3.3V and 5V outputs. This is due to
the fact the on time will not increase as V OUT increases
past 2.4V. Therefore, if the nominal switching frequency
band.
Using the frequency = (I ON /[2.4V ? 10pF]) ? DC, solve for
I ON = (1MHz ? 2.4V ? 10pF) ? (1/0.41) ? 58μA. I ON current
calculated from 12V input was 103μA, so a resistor from
f ADJ to ground = (0.7V/15k) = 46μA. 103μA – 46μA =
57μA, sets the adequate I ON current for proper frequency
range for the higher duty cycle conversion of 12V to
5V. Input voltage range is limited to 9V to 16V. Higher
input voltages can be used without the 15k on f ADJ . The
inductor ripple current gets too high above 16V, and the
400ns minimum off-time is limited below 9V.
is 850kHz, then the switching frequency will increase
4602fa
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM4602HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A, 28VIN High Effi ciency DC/DC μModule |
| LTM4602HVEV#PBF | 功能描述:IC DC/DC UMODULE 6A 104-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
| LTM4602HVEV#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC 制造商:Linear Technology 功能描述:IC, STEP-DOWN DC/DC MODULE, LGA-104 |
| LTM4602HVEVPBF | 制造商:Linear Technology 功能描述:6A DC/DC uModule LTM4602 |
| LTM4602HVEV-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A, 28VIN High Effi ciency DC/DC μModule |
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