參數(shù)資料
型號： LTC3620EDC-1#TRMPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 2 X 2 MM, LEAD FREE, PLASTIC, DFN-8
文件頁數(shù)： 1/18頁
文件大?。?/td> 318K
代理商： LTC3620EDC-1#TRMPBF
LTC3620
1
3620fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Ultralow Power 15mA
Synchronous Step-Down
Switching Regulator
The LTC
3620 is a high efciency, synchronous buck
regulator, suitable for very low power, very small footprint
applications powered by a single Li-Ion battery.
The internal synchronous switches increase efciency
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 efciency. 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.
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 prole, 2mm × 2mm
8-lead DFN package.
High Efciency Low Power
Step-Down Converter
n High Efciency: Up to 95%
n Maximum Current Output: 15mA
n Externally Programmable Frequency Clamp with
Internal 50kHz Default Minimizes Audio Noise
n 18μA IQ Current
n 2.9V to 5.5V Input Voltage Range
n Low-Battery Detection
n 0.6V Reference Allows Low Output Voltages
n Shutdown Mode Draws <1μA Supply Current
n 2.8V Undervoltage Lockout
n Unique Low Noise Control Architecture
n Internal Power MOSFETs
n No Schottky Diodes Required
n Internal Soft-Start
n Tiny 2mm × 2mm 8-Lead DFN Package
n Hearing Aids
n Wireless Headsets
n Li-Ion Cell Applications
n Button Cell Replacement
Efciency vs Load Current
VIN
RUN
1μF
CER
1μF
CER
LOBATB
VIN
2.9V TO 5.5V
VOUT
1.1V
523k
3620 TA01a
432k
22μH
22pF
LTC3620
SW
VFB
FMIN/MODE
GND
LOAD CURRENT (mA)
0.1
40
EFFICIENCY
(%)
POWER
LOSS
(mW)
50
60
70
80
110
3620 TA01c
30
20
10
0
90
100
1.0
1.5
2.0
0.5
0
2.5
3.0
VOUT = 1.1V
VOUT = 1.8V
VOUT = 2.5V
EFFICIENCY
LOSS
VIN = 3V
FMIN/MODE = 0V
OUTPUT CURRENT (mA)
0
V
OUT
(mV
P-P
)
10
15
3620 TA01b
5
0
5
10
15
25
VIN = 5.5V
20
VOUT = 1.1V
FMIN/MODE = 0V
L = 22μH
VIN = 3.6V
Output Voltage Ripple
vs Load Current
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.
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