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Linear Technology Electronic Components Datasheet

LTC3620EDC Datasheet

Ultralow Power 15mA Synchronous Step-Down Switching Regulator

No Preview Available !

FEATURES
n High Efficiency: 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
APPLICATIONS
n Hearing Aids
n Wireless Headsets
n Li-Ion Cell Applications
n Button Cell Replacement
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.
LTC3620
Ultralow Power 15mA
Synchronous Step-Down
Switching Regulator
DESCRIPTION
The LTC®3620 is a high efficiency, synchronous buck
regulator, suitable for very low power, very small footprint
applications powered by a single Li-Ion battery.
The internal synchronous switches increase efficiency
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 efficiency. 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 profile, 2mm × 2mm
8-lead DFN package.
TYPICAL APPLICATION
High Efficiency Low Power
Step-Down Converter
VIN
2.9V TO 5.5V
VIN
RUN LOBATB
SW
1μF
LTC3620
CER
FMIN/MODE VFB
GND
22μH
22pF
VOUT
1.1V
432k
523k
1μF
CER
3620 TA01a
Output Voltage Ripple
vs Load Current
25
VOUT = 1.1V
FMIN/MODE = 0V
L = 22μH
20
VIN = 5.5V
15
VIN = 3.6V
10
5
0
0
5
10
15
OUTPUT CURRENT (mA) 3620 TA01b
Efficiency vs Load Current
100
3.0
90 EFFICIENCY
80
2.5
70
2.0
60
50
40 VIN = 3V
FMIN/MODE = 0V
30
VOUT = 1.1V
20
VOUT = 1.8V
VOUT = 2.5V
10
1.5
1.0
LOSS
0.5
0
0
0.1
1
10
LOAD CURRENT (mA)
3620 TA01c
3620fa
1


Linear Technology Electronic Components Datasheet

LTC3620EDC Datasheet

Ultralow Power 15mA Synchronous Step-Down Switching Regulator

No Preview Available !

LTC3620
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage.................................... –0.3V to 6V
RUN Voltage ................................. –0.3V to (VIN + 0.3V)
VFB Voltage ................................... –0.3V to (VIN + 0.3V)
LOBATB Voltage........................................... –0.3V to 6V
FMIN/MODE Voltage ..................... –0.3V to (VIN + 0.3V)
SW Voltage .................................. –0.3V to (VIN + 0.3V)
P-channel Switch Source Current (DC) ..................50mA
N-channel Switch Sink Current (DC)......................50mA
Operating Junction Temperature Range
(Note 2)..................................................–40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
SW 1
8 VIN
GND 2
9
7 RUN
FMIN/MODE 3
GND
6 VFB
LOBATB 4
5 NC
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 88.5°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3620EDC#PBF
LTC3620EDC#TRPBF
LFJJ
8-Lead (2mm × 2mm) Plastic DFN
LTC3620EDC-1#PBF
LTC3620EDC-1#TRPBF LFJK
8-Lead (2mm × 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for TA = 25°C (Note 2). VIN = 3.6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Input Voltage Range
VFB
Regulated Feedback Voltage (Note 3) LTC3620
LTC3620
LTC3620-1
LTC3620-1
l
2.9
5.5
V
0.594
0.6
0.606
V
l 0.588
0.6
0.612
V
1.089
1.1
1.111
V
l 1.078
1.1
1.122
V
ΔVFB
VLOADREG
IQ
IQSD
IQU
Reference Voltage Line Regulation
Output Voltage Load Regulation
Quiescent Current, No Switching
Quiescent Current in Shutdown
Quiescent Current in UVLO Condition
VIN = 3V to 5.5V (Note 3)
(Note 3)
VFB = 0.65V, FMIN/MODE = VIN
RUN = 0V
RUN = VIN, VIN = 2.5V
0.05
0.15
%/V
0.5
%
18
25
μA
0.01
1
μA
0.5
μA
IPK
Peak Inductor Current
fSW
Minimum Switching Frequency (Internal) VFB = 0.65V, FIN/MODE = 0
VRUN
RUN Input Voltage High
RUN Input Voltage Low
35
mA
l
40
50
kHz
0.8
V
0.3
V
IRUN
RUN Leakage Current
±0.01
±1
μA
3620fa
2


Part Number LTC3620EDC
Description Ultralow Power 15mA Synchronous Step-Down Switching Regulator
Maker Linear
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LTC3620EDC Datasheet PDF






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