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参数资料
| 型号： | LTC3620EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 15MA 8DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 50kHz |
| 电流 - 输出： | 15mA |
| 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-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-DFN（2x2） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
| 其它名称： | LTC3620EDC#TRMPBFDKR |
LTC3620
Ultralow Power 15mA
Synchronous Step-Down
Switching Regulator
FEATURES
DESCRIPTION
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High Ef?ciency: Up to 95%
Maximum Current Output: 15mA
Externally Programmable Frequency Clamp with
Internal 50kHz Default Minimizes Audio Noise
18μA I Q Current
2.9V to 5.5V Input Voltage Range
Low-Battery Detection
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws <1μA Supply Current
2.8V Undervoltage Lockout
Unique Low Noise Control Architecture
Internal Power MOSFETs
No Schottky Diodes Required
Internal Soft-Start
Tiny 2mm × 2mm 8-Lead DFN Package
The LTC ? 3620 is a high ef?ciency, synchronous buck
regulator, suitable for very low power, very small footprint
applications powered by a single Li-Ion battery.
The internal synchronous switches increase ef?ciency
and eliminate the need for external Schottky diodes. Low
output voltages are easily supported by the 0.6V feedback
reference voltage. The LTC3620-1 option is internally
programmed to provide a 1.1V output.
The LTC3620 uses a unique variable frequency architecture
to minimize power loss and achieve high ef?ciency. The
switching frequency is proportional to the load current, and
an internal frequency clamp forces a minimum switching
frequency at light loads to minimize noise in the audio
range. The user can program the frequency of this clamp
by applying an external clock to the FMIN/MODE pin.
Hearing Aids
Wireless Headsets
Li-Ion Cell Applications
Button Cell Replacement
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7528587.
TYPICAL APPLICATION
The battery status output, LOBATB, indicates when the
input voltage drops below 3V. To help prevent damage to
the battery, an undervoltage lockout (UVLO) circuit shuts
down the part if the input voltage falls below 2.8V.
The LTC3620 is available in a low pro?le, 2mm × 2mm
8-lead DFN package.
High Ef?ciency Low Power
Output Voltage Ripple
Step-Down Converter
vs Load Current
Ef?ciency vs Load Current
V IN
2.9V TO 5.5V
25
20
V OUT = 1.1V
FMIN/MODE = 0V
L = 22μH
100
90
80
EFFICIENCY
3.0
2.5
1μF
CER
V IN
RUN LOBATB
SW
LTC3620
FMIN/MODE V FB
GND
22μH
22pF
432k
523k
V OUT
1.1V
1μF
CER
15
10
5
V IN = 5.5V
V IN = 3.6V
70
60
50
40
30
20
10
V IN = 3V
FMIN/MODE = 0V
V OUT = 1.1V
V OUT = 1.8V
V OUT = 2.5V
LOSS
2.0
1.5
1.0
0.5
3620 TA01a
0
0
5
10
15
0
0.1
1
10
0
OUTPUT CURRENT (mA)
3620 TA01b
LOAD CURRENT (mA)
3620 TA01c
3620fa
1
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