LTC1627 Monolithic Synchronous Step-Down Switching Regulator
The LTC®1627 is a monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.65V, making it suitable for one or two lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, which extends operating time in battery-operated systems. The operating frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For switching noise sensitive applications it can be externally synchronized up to 525kHz. The SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor. Optional bootstrapping enhances the internal switch drive for single lithium-ion cell applications. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. The LTC1627 comes in an 8-lead SO package
产品特点 Features
- High Efficiency: Up to 95%
- Constant Frequency 350kHz Operation
- 2.65V to 8.5V VIN Range
- VOUT from 0.8V to VIN, IOUT to 500mA
- No Schottky Diode Required
- Synchronizable Up to 525kHz
- Selectable Burst Mode™ Operation
- Low Dropout Operation: 100% Duty Cycle
- Precision 2.5V Undervoltage Lockout
- Secondary Winding Regulation
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 200µA
- Shutdown Mode Draws Only 15µA Supply Current
- ±1.5% Reference Accuracy
- Available in 8-Lead SO Package
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应用
- Cellular Telephones
- Portable Instruments
- Wireless Modems
- RF Communications
- Distributed Power Systems
- Scanners
- Single and Dual Cell Lithium
典型应用图
参数
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LTC1627 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) * |
| LTC1627CS8 |
SO |
8 |
C |
$2.35 |
$2.05 |
| LTC1627CS8#PBF |
SO |
8 |
C |
$2.35 |
$2.05 |
| LTC1627CS8#TR |
SO |
8 |
C |
|
$2.11 |
| LTC1627CS8#TRPBF |
SO |
8 |
C |
|
$2.11 |
| LTC1627IS8 |
SO |
8 |
I |
$3.55 |
$3.05 |
| LTC1627IS8#PBF |
SO |
8 |
I |
$3.55 |
$3.05 |
| LTC1627IS8#TR |
SO |
8 |
I |
|
$3.11 |
| LTC1627IS8#TRPBF |
SO |
8 |
I |
|
$3.11 |
LTC1627 数据手册及相关资料下载
- 数据手册(英文) : LTC1627 - Monolithic Synchronous Step-Down Switching Regulator.PDF
- 应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
- 设计要点 (英文) : DN201 - A New, High Efficiency, Monolithic Synchronous Step-Down Regulator Works with Single or Dual Li-Ion Batteries.PDF
- 可靠性数据 : R384 Reliability Data .PDF
