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| 型号： | LTC1627IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 8.5 V |
| 输入电压： | 2.65 V ~ 8.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 35kHz ~ 350kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
LTC1627
Monolithic Synchronous
Step-Down Switching Regulator
FEATURES
DESCRIPTIO
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High Efficiency: Up to 96%
Constant Frequency 350kHz Operation
2.65V to 8.5V V IN Range
V OUT from 0.8V to V IN , I OUT to 500mA
No Schottky Diode Required
Synchronizable Up to 525kHz
Selectable Burst Mode TM 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: 200 μ A
Shutdown Mode Draws Only 15 μ A Supply Current
± 1.5% Reference Accuracy
Available in 8-Lead SO Package
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 appli-
cations. 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 inhib-
ited during synchronization or when the SYNC/FCB pin is
APPLICATIO S
pulled low to reduce noise and RF interference. Soft-start is
provided by an external capacitor.
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Cellular Telephones
Portable Instruments
Wireless Modems
RF Communications
Distributed Power Systems
Scanners
Single and Dual Cell Lithium
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
100
V OUT = 3.3V
V IN = 3.6V
1
I TH
SYNC/FCB
8
95
V IN = 6V
47pF
C SS
0.1 μ F
2
3
4
RUN/SS
LTC1627
V FB
GND
V DR
V IN
SW
7
6
5
L1 15 μ H
C OUT
100 μ F
6.3V
+
V OUT
3.3V
249k
+
V IN
2.8V*
TO 8.5V
C IN
22 μ F
16V
90
85
80
75
V IN = 8.4V
70
*V OUT CONNECTED TO V IN FOR 2.8V < V IN < 3.3V
80.6k
1
10 100
OUTPUT CURRENT (mA)
1000
Figure 1a. High Efficiency Step-Down Converter
1627 F01a
1627 F01b
Figure 1b. Efficiency vs Output Load Current
1
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