EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
UF PACKAGE
24-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 37°C/W,
θ
JC
= 4.5°C/W, 4 LAYER BOARD
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3110EFE#PBF
LTC3110IFE#PBF
LTC3110HFE#PBF
LTC3110EUF#PBF
LTC3110IUF#PBF
LTC3110HUF#PBF
TAPE AND REEL
LTC3110EFE#TRPBF
LTC3110IFE#TRPBF
LTC3110HFE#TRPBF
LTC3110EUF#TRPBF
LTC3110IUF#TRPBF
LTC3110HUF#TRPBF
PART MARKING*
LTC3110FE
LTC3110FE
LTC3110FE
3110
3110
3110
PACKAGE DESCRIPTION
24-Lead Plastic TSSOP
24-Lead Plastic TSSOP
24-Lead Plastic TSSOP
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
2
Rev C
For more information
www.analog.com
LTC3110
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
CAP
= 3.3V, V
SYS
= 3.3V, V
DIR
= V
SGND
, V
MODE
= V
RUN
= V
SYS
= SV
SYS
unless otherwise noted.
PARAMETER
V
CAP
No-Load Operating Range in Backup Operation
V
CAP
Start-Up
V
SYS
Operating Range in Charge Operation
Undervoltage Lockout Threshold
CONDITIONS
V
SYS
≥ 1.8V
V
SYS
< Undervoltage Lockout Threshold
V
DIR
= V
SYS
V
SYS
Ramping Down, V
CAP
= 0V
V
SYS
Ramping Up, V
CAP
= 0V
V
CAP
Ramping Down, V
SYS
= 0V, V
RUN
= V
CAP
V
CAP
Ramping Up, V
SYS
= 0V, V
RUN
= V
CAP
FB Feedback Voltage
FB Feedback Pin Input Current
FBV
CAP
End-of-Charge Threshold Rising
FBV
CAP
End-of-Charge Threshold Falling
FBV
CAP
Input Current
FBV
CAP
Overcharge Threshold Rising
FBV
CAP
Overcharge Hysteresis
Quiescent Current, Burst Mode Operation
(I
VCAP
+ I
VSYS
+ I
SVSYS
)
Quiescent Current, Shutdown (I
VCAP
)
Peak Current Limit in Backup Operation
DC Current Limit in Backup Operation
Peak Current Limit in Charge Operation
Reverse Current Limit in Backup Operation
Switch Leakage
V
MODE
= 0V
DIR = V
SYS
DIR = V
SYS
V
FBVCAP
= 1.1V
1.125
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
0.1
1.8
1.8
1.55
1.55
l
l
TYP
MAX
5.5
5.25
1.71
1.71
UNITS
V
V
V
V
V
V
V
V
V
nA
V
V
nA
V
mV
µA
µA
0°C < T
J
< 85°C (Note 5)
–40°C < T
J
< 150°C
0.592
0.589
0.6
0.6
0.1
1.095
0.608
0.611
50
1.117
50
1.175
1.040
1.061
0.1
1.150
35
40
40
0.05
1
7
7
2
Quiescent Current, End of Charge (I
VCAP
+ I
VSYS
+ I
SVSYS
) V
DIR
= V
SYS
V
RUN
= 0V, V
SYS
= SV
SYS
= 0V
(Note 4)
(Note 4)
(Note 4)
(Note 4)
Switch B, C: V
CAP
= V
SW1
= 5.5V,
V
SYS
= V
SW2
= 5.25V,
Switch A, D: V
CAP
= 5.5V, V
SYS
= 5.25V
V
SW1
= V
SW2
= 0V
Switch On-Resistance
Switch A (Note 6)
Switch B (Note 6)
Switch C (Note 6)
Switch D Including Sense Resistor (Note 6)
l
l
µA
A
A
A
A
µA
µA
mΩ
mΩ
mΩ
mΩ
5
3.5
5
1
6
4.5
6
1.2
0.1
0.1
64
49
49
86
Oscillator Frequency
V
CAP
= 0.2V
V
SYS
= 0.2V
From V
RUN
rising to V
FB
= 90%
l
900
1200
300
300
1.3
93
98
1500
kHz
kHz
kHz
ms
%
%
%
V
V
MΩ
V
V
mV
nA
Rev C
Soft Start-Up Time in Backup Mode
Maximum Duty Cycle in Boost Mode
Minimum Duty Cycle in Buck Mode
MODE Input Logic Threshold
MODE Input Pull-Down Resistor
DIR Threshold Rising
DIR Threshold Falling
DIR Hysteresis
DIR Input Current
0.8
91
1.8
96
0
V
CAP
= 0.2V
l
Enable Burst Mode Operation
Enable PWM Mode Operation
l
l
l
1
6
1.073
1.024
30
1.095
1.045
50
0.1
0.3
1.117
1.066
70
50
V
DIR
= 1.1V
For more information
www.analog.com
3
LTC3110
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
CAP
= 3.3V, V
SYS
= 3.3V, V
DIR
= V
SGND
, V
MODE
= V
RUN
= V
SYS
= SV
SYS
unless otherwise noted.
PARAMETER
CMPIN Threshold Rising
CMPIN Threshold Falling
CMPIN Input Current
PROG Voltage
PROG Current Gain
I
VSYS
Input Current Limit
V
CMPIN
= 5.5V
V
FBVCAP
= 1V, DIR = V
SYS
DIR = V
SYS
R
PROG
= 24.3k (Notes 7, 8), DIR = V
SYS
R
PROG
= 24.3k (Notes 7, 8, 9), DIR = V
SYS
,
T
J
= –40°C to 125°C
R
PROG
= 12.1k (Notes 7, 8), DIR = V
SYS
R
PROG
= 12.1k (Notes 7, 8, 9), DIR = V
SYS
,
T
J
= –40°C to 125°C
R
PROG
= 6.04k (Notes 7, 8), DIR = V
SYS
R
PROG
= 6.04k (Notes 7, 8, 9), DIR = V
SYS
,
T
J
= –40°C to 125°C
R
PROG
= 3.01k (Notes 7, 8), DIR = V
SYS
R
PROG
= 3.01k (Notes 7, 8, 9), DIR = V
SYS
,
T
J
= –40°C to 125°C
R
PROG
= 1.5k (Notes 7, 8), DIR = V
SYS
R
PROG
= 1.5k (Notes 7, 8, 9), DIR = V
SYS
,
T
J
= –40°C to 125°C
V
MID
= Open Load, V
CAP
= 5V
V
CAP
= 5V, V
MID
= 5V
V
CAP
= 5V, V
MID
= 0V
V
RUN
= 0V
V
MID
Rising, V
CAP
= 5V
V
MID
Falling, V
CAP
= 5V
I = 10mA
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
0.638
0.575
TYP
0.65
0.59
0.1
0.6
200
MAX
0.662
0.605
50
UNITS
V
V
nA
V
µA/A
119
115
241
234
487
473
977
948
1960
1900
0.492
150
123
123
248
248
497
497
997
997
2000
2000
0.5
300
–300
0.1
2.6
2.4
0.1
128
135
255
270
507
525
1017
1046
2040
2100
0.508
–150
1
2.62
0.3
1
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
MID
to V
CAP
Voltage Ratio
V
MID
Balancing Current
V
MID
Current in Shutdown
V
MID
Suspend Charging Threshold
CHRG,
CAPOK,
CMPOUT
Open-Drain Output Voltage
RUN Input Logic Threshold
RUN Pull-Down Resistor
mA
mA
µA
V
V
V
V
MΩ
2.38
0.3
6
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 LTC3110 is tested under pulsed load conditions such that
T
J
~ T
A
. The LTC3110E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3110I is guaranteed to meet specifications over the –40°C to 125°C
operating junction temperature range. The LTC3110H is guaranteed
to meet specifications over the full –40°C to 150°C operating junction
temperature range. High temperatures degrade operating lifetime;
operating life time is derated for junction temperatures greater than 125°C.
Note that the maximum ambient temperature consistent with these
specifications is determined by specific operating conditions in
conjunction with board layout, the rated 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:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4:
Current measurements are performed when the LTC3110 is
not switching. The current limit values measured in operation will be
somewhat higher due to the propagation delay of the comparators.
Note 5:
Guaranteed by design characterization and correlation with
statistical process controls.
Note 6:
Guaranteed by design, correlation and bench measurements.
Note 7:
Current measurements are made when the output is not switching.
Note 8:
Accuracy of this specification is directly related to the accuracy of
the resistor used to program the parameter.
Note 9:
The Input Current Limit is reduced at junction temperatures above
125°C. See Thermal Foldback of Charge Current in the Operation section,
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