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LTC3620EDC-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3620
1
3620fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Ultralow Power 15mA
Synchronous Step-Down
Switching Regulator
The LTC
®
3620 is a high effi 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 effi 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 effi 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.
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 profi le, 2mm × 2mm
8-lead DFN package.
High Effi ciency Low Power
Step-Down Converter
n
High Effi ciency: Up to 95%
n
Maximum Current Output: 15mA
n
Externally Programmable Frequency Clamp with
Internal 50kHz Default Minimizes Audio Noise
n
18µA I
Q
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
Effi ciency vs Load Current
V
IN
RUN
1µF
CER
1µF
CER
LOBATB
V
IN
2.9V TO 5.5V
V
OUT
1.1V
523k
3620 TA01a
432k
22µH
22pF
LTC3620
SW
V
FB
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
V
OUT
= 1.1V
V
OUT
= 1.8V
V
OUT
= 2.5V
EFFICIENCY
LOSS
V
IN
= 3V
FMIN/MODE = 0V
OUTPUT CURRENT (mA)
0
$V
OUT
(mV
P-P
)
10
15
3620 TA01b
5
0
5
10
15
25
V
IN
= 5.5V
20
V
OUT
= 1.1V
FMIN/MODE = 0V
L = 22µH
V
IN
= 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.
LTC3620
2
3620fa
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage .................................... –0.3V to 6V
RUN Voltage ................................. –0.3V to (V
IN
+ 0.3V)
V
FB
Voltage ................................... –0.3V to (V
IN
+ 0.3V)
LOBATB Voltage ........................................... –0.3V to 6V
FMIN/MODE Voltage ..................... –0.3V to (V
IN
+ 0.3V)
SW Voltage .................................. –0.3V to (V
IN
+ 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
(Note 1)
TOP VIEW
SW
GND
FMIN/MODE
LOBATB
V
IN
RUN
V
FB
NC
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
9
GND
4
1
2
3
6
5
7
8
T
JMAX
= 125°C, θ
JA
= 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 TEMPERATURE RANGE
LTC3620EDC#PBF LTC3620EDC#TRPBF LFJJ
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3620EDC-1#PBF LTC3620EDC-1#TRPBF LFJK
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are for T
A
= 25°C (Note 2). V
IN
= 3.6V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
l
2.9 5.5 V
V
FB
Regulated Feedback Voltage (Note 3) LTC3620
LTC3620
LTC3620-1
LTC3620-1
l
l
0.594
0.588
1.089
1.078
0.6
0.6
1.1
1.1
0.606
0.612
1.111
1.122
V
V
V
V
ΔV
FB
Reference Voltage Line Regulation V
IN
= 3V to 5.5V (Note 3) 0.05 0.15 %/V
V
LOADREG
Output Voltage Load Regulation (Note 3) 0.5 %
I
Q
Quiescent Current, No Switching V
FB
= 0.65V, FMIN/MODE = V
IN
18 25 µA
I
QSD
Quiescent Current in Shutdown RUN = 0V 0.01 1 µA
I
QU
Quiescent Current in UVLO Condition RUN = V
IN
, V
IN
= 2.5V 0.5 µA
I
PK
Peak Inductor Current 35 mA
f
SW
Minimum Switching Frequency (Internal) V
FB
= 0.65V, FIN/MODE = 0
l
40 50 kHz
V
RUN
RUN Input Voltage High 0.8 V
RUN Input Voltage Low 0.3 V
I
RUN
RUN Leakage Current ±0.01 ±1 µA
LTC3620
3
3620fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3620 is tested under pulsed load conditions such that T
J
≈ T
A
.
LTC3620E is guaranteed to meet specifi cations from 0°C to 85°C
junction temperature. Specifi cations over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. Note that the maximum
ambient temperature consistent with these specifi cations is determined by
specifi c operating conditions in conjunction with board layout, the rated
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are for T
A
= 25°C (Note 2). V
IN
= 3.6V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FMIN
FMIN/MODE Input Voltage High 0.9 V
FMIN/MODE Input Voltage Low 0.7 V
f
EXT
FMIN/MODE Input Frequency 20 300 kHz
I
FMIN/MODE
FMIN/MODE Pin Leakage Current ±0.01 ±1 µA
I
SW
Switch Leakage Current V
RUN
= 0V, V
SW
= 0V or 5.5V, V
IN
= 5.5V ±0.01 ±1 µA
I
FB
V
FB
Pin Current LTC3620, V
FB
= 0.6V
LTC3620-1, V
FB
= 1.1V
0
1.2
±30
2.0
nA
µA
V
UVLO
Undervoltage Lockout (UVLO) V
IN
Decreasing 2.7 2.8 2.9 V
V
LOBATB
LOBATB Threshold Voltage V
IN
Decreasing 2.93 3.0 3.08 V
R
LOBATB
LOBATB Pull-Down On-Resistance 15
V
HLOBATB
LOBATB Hysteresis Voltage 100 mV
R
PFET
R
DS(ON)
of P-channel FET (Note 4) I
SW
= 50mA, V
IN
= 3.6V
2.0
R
NFET
R
DS(ON)
of N-channel FET (Note 4) I
SW
= –50mA, V
IN
= 3.6V 1.0
package thermal impedance and other environmental factors. The junction
temperature (T
J
, in °C) is calculated from the ambient temperature (T
A
, in °C)
and power dissipation (P
D
, in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
), where θ
JA
(in °C/W) is the package thermal
impedance.
Note 3: The LTC3620 is tested in a proprietary test mode that connects V
FB
to the output of the error amplifi er.
Note 4: The DFN switch-on resistance is guaranteed by correlation to
wafer level measurements.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3620EDC-1#TRMPBF

Mfr. #:
Buy LTC3620EDC-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Ultralow Power 15mA High Efficiency Step Down Switching Regulator
Lifecycle:
New from this manufacturer.
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