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参数资料
| 型号： | LTM8052IV#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PBGA81 |
| 封装： | 15 X 11.25 MM, 2.82 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-81 |
| 文件页数： | 7/28页 |
| 文件大小： | 350K |
| 代理商： | LTM8052IV#PBF |
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LTM8052
15
8052f
must have a logic low below 0.6V, a logic high greater
than 1.2V and frequency between 100kHz and 1MHz. The
input frequency must be 20% higher than the frequency
determined by the resistor at the RT pin. Input signals
outside of these specified parameters may cause erratic
switching behavior and subharmonic oscillations. The
SYNC pin must be tied to GND if synchronization to an
external clock is not required. When SYNC is grounded,
the switching frequency is determined by the resistor at
the RT pin.
Switching Mode
The LTM8052 operates in forced continuous mode. This
means that the part will not skip cycles when the load
approaches zero amps. This may be particularly useful in
applications where the synchronization function is used,
or any time discontinuous switching is undesirable. The
LTM8052 will not operate in forced continuous mode
when an input UVLO, output OVLO or minimum duty cycle
violation occurs.
Soft-Start
The soft-start function controls the slew rate of the power
supply output voltage during start-up. A controlled output
voltagerampminimizesoutputvoltageovershoot,reduces
inrush current from the VIN supply, and facilitates supply
sequencing. A capacitor connected from the SS pin to
GND programs the slew rate. The capacitor is charged
from an internal 11A current source to produce a ramped
output voltage.
Maximum Output Current Adjust
To adjust the regulated load current, an analog voltage
is applied to the CTL_I pin or CTL_T pins. Varying the
voltage between 0V and 1.5V adjusts the maximum
current between the minimum and the maximum current,
typically 5.6A positive and 7.7A negative. Graphs of the
output current vs CTL_I and CTL_T voltages are given
in the Typical Performance Characteristics section. The
LTM8052providesa2Vreferencevoltageforconveniently
applying resistive dividers to set the current limit. The
applicaTions inForMaTion
Figure 1. Setting the Output Current Limit
current limit can be set as shown in Figure 1 with the
following equation:
IMAX =
7.467 R2
R1
+R2
Amps Positive Current
(
)
IMAX =
7.467 R2
R1
+R2
+ 2.1 Amps Negative Current
(
)
Load Current Derating Using the CTL_T Pin
Inhighcurrentapplications,deratingthemaximumcurrent
basedonoperatingtemperaturemaypreventdamagetothe
load.Inaddition,manyapplicationshavethermallimitations
that will require the regulated current to be reduced based
on the load and/or board temperature. To achieve this,
the LTM8052 uses the CTL_T pin to reduce the effective
regulated current in the load. While CTL_I programs the
regulated current in the load, CTL_T can be configured to
reduce this regulated current based on the analog voltage
at the CTL_T pin. The load/board temperature derating is
programmed using a resistor network with a temperature
dependant resistance (Figure 2). When the board/load
temperature rises, the CTL_T voltage will decrease. To
reduce the regulated current, the CTL_T voltage must be
lower than the voltage at the CTL_I pin. VCTL_T may be
higher than VCTL_I, but then it will have no effect.
Figure 2. Load Current Derating vs
Temperature Using NTC Resistor
LTM8052
VREF
R1
2V
R2
8052 F01
CTL_I OR CTL_T
LTM8052
VREF
RNTC
RX
RV
R1
R2
(OPTION A TO D)
8052 F02
CTL_T
B
RNTC
A
RNTC
RX
D
RNTC
C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8061 | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.1#PBF | 功能描述:IC BATTERY CHARGER 4.1V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTM8061EV-4.1PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.2#PBF | 功能描述:IC BATTERY CHARGER 4.2V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTM8061EV-4.2PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
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