Range..................................................... –40°C to 125°C
Storage Temperature Range ......................–65 to 150°C
GATE 10
BAT 11
DJC PACKAGE
22-LEAD (6mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 31.8°C/W
EXPOSED PAD (PIN 23) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4091EDJC#PBF
LTC4091IDJC#PBF
TAPE AND REEL
LTC4091EDJC#TRPBF
LTC4091IDJC#TRPBF
http://www.linear.com/product/LTC4091#orderinfo
PART MARKING*
4091
4091
PACKAGE DESCRIPTION
22-Lead (6mm × 3mm) Plastic DFN
22-Lead (6mm × 3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
4091fa
For more information
www.linear.com/LTC4091
LTC4091
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
IN
= RUN/SS = 12V, BOOST = 17V, V
BAT
= 3.7V and
R
PROG
= 105k, unless otherwise noted.
SYMBOL
V
VIN
V
OVLO
I
VIN
V
OUT
f
SW
t
OFF
I
SW(MAX)
V
SAT
I
R
V
B(MIN)
I
BST
I
BAT
V
CHG
I
CHG
I
CHG(MAX)
V
PROG
k
EOC
I
TRKL
V
TRKL
V
CEN
PARAMETER
Operating Supply Voltage
V
IN
Overvoltage Lockout Threshold
V
IN
Bias Current
Output Voltage with V
IN
Present
Switching Frequency
Shutdown; RUN/SS = 0.2V
Charger Terminated, R
HVPR
= 4.99k
Assumes HVOUT to OUT Connection
R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
l
MIN
6
36
TYP
MAX
36
UNITS
V
V
µA
mA
V
MHz
kHz
kHz
ns
A
mV
µA
V
mA
µA
V
V
mA
mA
A
V
V
mA/mA
mA
V
mV
mV
Switching Step-Down Regulator
38
0.01
1.1
3.45
2.1
900
160
2.5
I
SW
= 2A
SW = 10V, HVOUT = 0V
l
40
1
4.45
2.7
1150
240
150
5.0
2
2.1
35
100
4.252
4.152
550
1100
1.02
1.02
0.13
75
3.0
V
BAT
+0.1
2.4
1000
200
60
3.8
500
0.02
1.5
22
Minimum Switch Off-Time
Switch Current Limit
Switch V
CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 6)
BOOST Pin Current
Battery Drain Current
V
BAT
Regulated Output Voltage
Constant-Current Mode Charge Current
Maximum Charge Current
PROG Pin Servo Voltage
Ratio of End-of-Charge Indication Current to
Charge Current
Trickle Charge Current
Trickle Charge Threshold Voltage
Charger Enable Threshold Voltage
I
SW
= 1A
V
VIN
= 0V, BAT Powers OUT, No Load
I
BAT
= 2mA; V4P1 = Open
I
BAT
= 2mA; V4P1 = BAT
R
PROG
= 105k, No Load
R
PROG
= 52.3k, No Load; 0 ≤ T
A
≤ 85°C
(Note 5)
R
PROG
= 105k
R
PROG
= 52.3k
V
BAT
= V
CHG
(4.2V)
BAT = 2V
BAT Rising
(V
OUT
– V
BAT
) Falling; V
BAT
= 4V
(V
OUT
– V
BAT
) Rising; V
BAT
= 4V
Threshold Voltage Relative to V
CHG
V
BAT
= 4.3V
Percent of Total Charge Time
Percent of Total Charge Time,
V
BAT
< V
TRKL
Battery Management (Note 8)
l
60
4.148
4.048
4.200
4.100
500
1000
1.5
1.00
1.00
0.1
50
2.9
55
80
l
l
465
880
0.98
0.98
0.08
35
l
l
l
l
2.75
ΔV
RECHRG
Recharge Battery Threshold Voltage
t
TIMER
TIMER Accuracy
Recharge Time
Low Battery Trickle Charge Time
T
LIM
Junction Temperature in Constant Temperature
Mode
On Resistance V
BAT
to V
OUT
Voltage Forward Drop (V
BAT
– V
OUT
)
l
–65
–10
–100
50
25
105
–150
10
mV
%
%
%
°C
Internal Ideal Diode
R
DIO,ON
V
FWD
I
OUT
= 2A
I
OUT
= 5mA
I
OUT
= 100mA
I
OUT
= 1000mA
l
75
10
30
40
75
50
mΩ
mV
mV
mV
4091fa
For more information
www.linear.com/LTC4091
3
LTC4091
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
IN
= RUN/SS = 12V, BOOST = 17V, V
BAT
= 3.7V and
R
PROG
= 105k, unless otherwise noted.
SYMBOL
V
FWD,EXT
V
CHG,SD
I
CHG,SD
V
OL
V
RUN,H
V
RUN,L
I
RUN/SS
I
VGLK
I
VG
V
SYNC,L
V
SYNC,H
I
SYNC
NTC
I
VNTC
V
VNTC
I
NTC
V
COLD
V
HOT
V
DIS
VNTC Pin Current
VNTC Bias Voltage
NTC Input Leakage Current
Cold Temperature Fault Threshold Voltage
Hot Temperature Fault Threshold Voltage
NTC Disable Threshold Voltage
VNTC = 2.5V
I
VNTC
= 500µA
NTC = 1V
Rising NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
l
l
ELECTRICAL CHARACTERISTICS
PARAMETER
External Diode Forward Voltage
Charger Shutdown Threshold Voltage on TIMER
Charger Shutdown Pull-Up Current on TIMER
Output Low Voltage
RUN/SS High Threshold
RUN/SS Low Threshold
RUN/SS Pin Bias Current
VINGD
Leakage
VINGD
Sink Current
SYNC Low Threshold
SYNC High Threshold
SYNC Pin Bias Current
CONDITIONS
MIN
TYP
20
MAX
UNITS
mV
External Ideal Diode
Logic (CHRG,
VINGD, HVPR,
TIMER, RUN/SS, SYNC)
V
TIMER
Falling
V
TIMER
= 0V
(CHRG,
HVPR);
I
SINK
= 5mA
l
l
l
0.1
5
3
0.2
14
0.1
0.4
V
µA
V
V
V
µA
µA
µA
V
V
µA
RUN/SS = 2.5V
VINGD
= 5V, RUN/SS = 0V
VINGD
= 0.4V
l
5
0.1
100
1
400
10
1
0.3
V
SYNC
= 0V
1.4
4.4
–0.1
2.5
4.85
0
0.738 • VNTC
0.02 • VNTC
0.290 • VNTC
0.01 • VNTC
75
100
35
125
±1
3.5
mA
V
µA
V
V
V
V
mV
mV
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 LTC4091 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC4091E is guaranteed to meet 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
LTC4091I is guaranteed over the –40°C to 125°C operating junction
temperature range. 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 (PD, in Watts) according to the formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
= 31.8°C/W for the DJC package.
Note 3:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 4:
V
CC
is the greater of V
OUT
, and V
BAT
Note 5:
Accuracy of programmed current may degrade for currents
greater than 1.5A.
Note 6:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 7:
Absolute Maximum Voltage at V
IN
and RUN/SS pins is for
nonrepetitive one second transients; 40V for continuous operation.
Note 8:
Due to the thermal regulation feature of the battery charger, circuit
parameters in the Battery Management section are not testable and do not
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