概览
优势和特点
- Maintains Constant Frequency at Low Output Currents
- Dual N-Channel MOSFET Synchronous Drive
- Programmable Fixed Frequency (PLL Lockable)
- Wide VIN Range: 3.5V to 36V Operation
- Ultrahigh Efficiency
- Very Low Dropout Operation: 99% Duty Cycle
- Low Dropout, 0.5A Linear Regulator for VPP
- Generation or Low Noise Audio Supply
- Built-In Power-On Reset Timer
- Programmable Soft Start
- Low-Battery Detector
- Remote Output Voltage Sense
- Foldback Current Limiting (Optional)
- Pin Selectable Output Voltage
- 5V Standby Regulator Active in Shutdown: IQ < 200 µA
- Output Voltages from 1.19V to 9V
- Available in 28- and 36-Lead SSOP Packages
产品详情
The LTC®1538-AUX/LTC1539 are dual,synchronous step- down switching regulator controllers which drive external N-channel power MOSFETs in a phase-lockable fixed frequency architecture. The Adaptive Power TM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents. An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB1) guarantees regulation regardless of load on the main output by forcing continuous operation. A 5V/20mA regulator, internal 1.19V reference and an uncommitted comparator remain active when both controllers are shut down. A power-on reset timer (POR) is included which generates a signal delayed by 65536/f CLK (typ 300ms) after the controller’s output is within 5% of the regulated first voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability on one of the two outputs. The operating current levels are user-programmable via external current sense resistors. Wide input supply range allows operation from 3.5V to 30V (36V maximum).应用
- Notebook and Palmtop Computers, PDAs
- Portable Instruments
- Battery-Operated Devices
- DC Power Distribution Systems
产品分类
产品生命周期
量产
该产品系列中至少有一个型号已量产并可供采购。该产品适合用于新设计，但也可能有更新的替代产品。
评估套件 (1)
参考资料
-
R393 Reliability Data3/22/2018
-
DC106B - Demo Manual9/24/2009
-
VID Voltage Programmer for Intel Mobile Processors8/1/1998 LT Journal
工具及仿真模型
LTspice中提供以下器件型号：
LTC1539
设计资源
ADI始终把满足您可靠性水平的产品放在首要位置。我们通过在所有产品、工艺设计和制造过程中引入高质量和可靠性检查实践这一承诺。发运的产品实现“零缺陷”始终是我们的目标。
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC1539CGW#PBF | 材料声明 | 质量和可靠性 | 36-Lead SSOP (Wide 0.3 Inch) | |
| LTC1539CGW#TRPBF | 材料声明 | 质量和可靠性 | 36-Lead SSOP (Wide 0.3 Inch) | |
| LTC1539IGW#PBF | 材料声明 | 质量和可靠性 | 36-Lead SSOP (Wide 0.3 Inch) | |
| LTC1539IGW#TRPBF | 材料声明 | 质量和可靠性 | 36-Lead SSOP (Wide 0.3 Inch) | |
| Wafer Fabrication Data | R393 Reliability Data |
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