LTC1736 5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator
The LTC®1736 is a synchronous step-down switching regulator controller optimized for CPU power. The output voltage is programmed by a 5-bit digital-to-analog converter (DAC) that adjusts the output voltage from 0.925V to 2.00V according to Intel mobile VID specifications. The 0.8V reference is compatible with future microprocessor generations. The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window comparator that indicates when the output is within 7.5% of its programmed value. Protection features include: internal foldback current limiting, output overvoltage crowbar and optional short-circuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum). Pin defeatable Burst Mode™ operation provides high efficiency at low load currents. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values
产品特点 Features
- Dual N-Channel MOSFET Synchronous Drive
- Synchronizable/Programmable Fixed Frequency
- Wide VIN Range: 3.5V to 36V Operation
- 5-Bit Digital-to-Analog VOUT Selection:
0.925V to 2.00V Range with 50mV/25mV Steps
- OPTI-LOOP™ Compensation Minimizes COUT
- ±1% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Output Overvoltage Crowbar Protection
- Internal Current Foldback
- Latched Short-Circuit Shutdown Timer with Defeat Option
- Forced Continuous Control Pin
- Optional Programmable Soft-Start
- Remote Output Voltage Sense
- Available in 24-Lead SSOP Package
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应用
- Notebook and Palmtop Computers, PDAs
- Power Supply for Mobile Pentium® II and Pentium III Processors
- Low Voltage Power Supplies
典型应用图
参数
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LTC1736 订购信息和价格参考Package Variations and Pricing
| 器件型号 |
封装 |
引脚 |
温度 |
价格 (以 1 ~ 99 片为批量) |
价格 (以 1000 片为批量) * |
| LTC1736CG |
SSOP |
24 |
C |
$4.15 |
$3.50 |
| LTC1736CG#PBF |
SSOP |
24 |
C |
$4.15 |
$3.50 |
| LTC1736CG#TR |
SSOP |
24 |
C |
|
$3.60 |
| LTC1736CG#TRPBF |
SSOP |
24 |
C |
|
$3.60 |
| LTC1736IG |
SSOP |
24 |
I |
$5.65 |
$4.65 |
| LTC1736IG#PBF |
SSOP |
24 |
I |
$5.65 |
$4.65 |
| LTC1736IG#TR |
SSOP |
24 |
I |
|
$4.75 |
| LTC1736IG#TRPBF |
SSOP |
24 |
I |
|
$4.75 |
LTC1736 数据手册及相关资料下载
- 数据手册(英文) : LTC1736 - 5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator.PDF
- 应用指南 (英文) : AN76 - OPTI-LOOP Architecture Reduces Output Capacitance and Improves Transient Response.PDF
- 设计要点(英文) : Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors.PDF
- 设计要点 (英文) : DN199 - LTC1736 Provides Low Cost, Efficient Mobile CPU Power.PDF
- 设计要点 (英文) : DN209 - 2-Step Voltage Regulation Improves Performance and Decreases CPU Temperature in Portable Computers.PDF
- 设计要点 (英文) : DN279 - Microprocessor Core Supply Voltage Set by I2C Bus Without VID Lines.PDF
- 可靠性数据 : R384 Reliability Data .PDF
