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参数资料
| 型号： | LTC3814IFE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 55 V |
| 降压： | 无 |
| 升压： | 是 |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3814-5
OPERATION
IC/Driver Supply Power
The LTC3814-5’s internal control circuitry and top and bot-
tom MOSFET drivers operate from a supply voltage (INTV CC
pin) in the range of 4.5V to 14V. If the input supply voltage
or another available supply is within this voltage range it
can be used to supply IC/driver power. If a supply in this
range is not available, two internal regulators are available
APPLICATIONS INFORMATION
The basic LTC3814-5 application circuit is shown on the
?rst page of this data sheet. External component selection
is primarily determined by the maximum input voltage and
load current and begins with the selection of the power
MOSFET switches. The LTC3814-5 uses the on-resistance
to generate a 5.5V supply from the input or output. An
internal low dropout regulator is good for voltages up to
15V, and the second, a linear regulator controller, controls
the gate of an external NMOS to generate the 5.5V supply.
Since the NMOS is external, the user has the ?exibility to
choose a BV DSS as high as necessary.
input in order to dimension the power MOSFET properly
and to choose the maximum sense voltage. Based on the
fact that, ideally, the output power is equal to the input
power, the maximum average input current and average
inductor current is:
of the synchronous power MOSFET for determining the
inductor current. The desired amount of ripple current and
operating frequency largely determines the inductor value.
I IN(MAX) = I L,AVG(MAX) =
I O(MAX)
1 ? D MAX
Next, C OUT is selected for its ability to handle the large RMS
current and is chosen with low enough ESR to meet the
output voltage ripple and transient speci?cation. Finally,
loop compensation components are selected to meet the
required transient/phase margin speci?cations.
The current mode control loop will not allow the induc-
tor peak to exceed V SENSE(MAX) /R SENSE . In practice, one
should allow some margin for variations in the LTC3814-
5 and external component values, and a good guide for
selecting the maximum sense voltage when V DS sensing
Duty Cycle Considerations
For a boost converter, the duty cycle of the main switch
is:
is used is:
V SENSE(MAX) =
1.7 ? R DS(ON) ?I O(MAX)
1 ? D MAX
D = 1 ?
V IN
V OUT
; D MAX = 1 ?
V IN(MIN)
V OUT
V SENSE is set by the voltage applied to the V RNG pin. Once
V SENSE is chosen, the required V RNG voltage is calculated
to be:
V OUT(MAX) =
≤ 60V
ThemaximumV OUT capabilityoftheLTC3814-5isinversely
proportional to the minimum desired operating frequency
and minimum off-time:
V IN(MIN)
f MIN ? t OFF(MIN)
Maximum Sense Voltage and the V RNG Pin
V RNG = 5.78 ? (V SENSE(MAX) + 0.026)
An external resistive divider from INTV CC can be used
to set the voltage of the V RNG pin between 0.5V and 2V
resulting in nominal sense voltages of 60mV to 320mV.
Additionally, the V RNG pin can be tied to SGND or INTV CC
in which case the nominal sense voltage defaults to 95mV
or 215mV, respectively.
The control circuit in the LTC3814-5 measures the input
current by using the R DS(ON) of the bottom MOSFET or
by using a sense resistor in the bottom MOSFET source,
so the output current needs to be re?ected back to the
38145fc
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