(Note 2).................................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
LTC4120
TOP VIEW
FAULT
CHRG
PROG
RUN
LTC4120-4.2
TOP VIEW
FAULT
CHRG
PROG
12 NTC
17
GND
11 NC
10 BATSNS
9
5
GND
6
DHC
7
FREQ
8
CHGSNS
BAT
RUN
12 NTC
17
GND
11 FBG
10 FB
9
5
GND
6
DHC
7
FREQ
8
CHGSNS
BAT
INTV
CC
1
BOOST 2
IN 3
SW 4
16 15 14 13
INTV
CC
1
BOOST 2
IN 3
SW 4
16 15 14 13
UD PACKAGE
16-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN
θ
JA
UD PACKAGE
16-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN
θ
JA
(http://www.linear.com/product/LTC4120#orderinfo)
LEAD FREE FINISH
LTC4120EUD#PBF
LTC4120IUD#PBF
LTC4120EUD-4.2#PBF
LTC4120IUD-4.2#PBF
TAPE AND REEL
LTC4120EUD#TRPBF
LTC4120IUD#TRPBF
LTC4120IUD-4.2#TRPBF
PART MARKING*
LGHB
LGHB
LGMT
PACKAGE DESCRIPTION
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
ORDER INFORMATION
LTC4120EUD-4.2#TRPBF LGMT
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.
LTC4120 OPTIONS
LTC4120
LTC4120-4.2
FLOAT VOLTAGE
Programmable
4.2V Fixed
2
4120ff
For more information
www.linear.com/LTC4120
LTC4120/LTC4120-4.2
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
= V
RUN
= 15V, V
CHGSNS
= V
BAT
= 4V, R
PROG
= 3.01k,
V
FB
= 2.29V (LTC4120), V
BATSNS
= 4V (LTC4120-4.2). Current into a pin is positive out of the pin is negative.
SYMBOL
PARAMETER
Operating Input Supply Range
Battery Voltage Range
I
IN
DC Supply Current
Switching, FREQ = GND
Standby Mode (Note 3)
Sleep Mode (Note 3)
LTC4120: V
FB
= 2.51V (Note 5),
LTC4120-4.2: V
BATSNS
= 4.4V
Disabled Mode (Note 3)
Shutdown Mode (Note 3)
∆V
DUVLO
Differential Undervoltage Lockout
Hysteresis
UV
INTVCC
INTV
CC
Undervoltage Lockout
Hysteresis
Battery Charger
I
BAT
BAT Standby Current
BAT Shutdown Current
I
BATSNS
I
FB
I
FBG(LEAK)
R
FBG
V
FB(REG)
V
FLOAT
I
CHG
V
UVCL
V
RCHG
V
RCHG_4.2
h
PROG
V
PROG
R
SNS
BATSNS Standby Current (LTC4120-4.2)
BATSNS Shutdown Current (LTC4120-4.2)
Feedback Pin Bias Current (LTC4120)
Feedback Ground Return Resistance (LTC4120)
Feedback Regulation Voltage (LTC4120)
Regulated Float Voltage (LTC4120-4.2)
Battery Charge Current
Undervoltage Current Limit
Battery Recharge Threshold
Battery Recharge Threshold
Ratio of BAT Current to PROG Current
PROG Pin Servo Voltage
CHGSNS-BAT Sense Resistor
I
BAT
= –100mA
R
PROG
= 3.01k
R
PROG
= 24.3k
V
IN
Falling
V
FB
Falling Relative to V
FB_REG
(LTC4120) (Note 5)
V
BATSNS
Falling Relative to V
FLOAT
(LTC4120-4.2)
V
TRKL
< V
FB
< V
FB(REG)
(LTC4120) (Note 5)
V
TRKL_4.2
< V
BATSNS
< V
FLOAT
(LTC4120-4.2)
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
12.5
0
TYP
MAX
40
11
UNITS
V
V
mA
µA
µA
µA
µA
mV
mV
3.5
130
60
37
20
20
80
115
l
220
100
70
40
160
V
IN
-V
BAT
Falling, V
IN
= 5V (LTC4120),
V
IN
-V
BATSNS
Falling, V
IN
= 5V (LTC4120-4.2)
V
IN
-V
BAT
Rising, V
IN
= 5V (LTC4120),
V
IN
-V
BATSNS
Rising, V
IN
= 5V (LTC4120-4.2)
INTV
CC
Rising, V
IN
= INTV
CC
+ 100mV, V
BAT
= NC
INTV
CC
Falling (Note 4)
Standby Mode (LTC4120) (Notes 3, 7, 8)
Standby Mode (LTC4120-4.2) (Notes 3, 7, 8)
Shutdown Mode (LTC4120) (Notes 3, 7, 8)
Shutdown Mode (LTC4120-4.2) (Notes 3, 7, 8)
Standby Mode (Notes 3, 7, 8)
Shutdown Mode (Notes 3, 7, 8)
V
FB
= 2.5V (Notes 5, 7)
4.00
4.15
220
4.26
V
mV
l
l
l
l
l
l
l
l
l
2.5
50
1100
10
5.4
1100
25
1000
2.393
2.370
2.400
4.200
402
50
12.0
–38
–70
–50
–92
988
1.206
1.227
300
4.5
1000
2000
1000
10
2000
60
1
2000
2.407
2.418
4.212
4.227
421
55
–62
–114
µA
nA
nA
nA
µA
nA
nA
µA
Ω
V
V
V
V
mA
mA
V
mV
mV
mA/mA
Feedback Ground Leakage Current (LTC4120) Shutdown Mode (Notes 3, 7)
(Note 5)
l
4.188
l
4.148
l
l
383
45
1.248
V
mΩ
For more information
www.linear.com/LTC4120
3
4120ff
LTC4120/LTC4120-4.2
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
= V
RUN
= 15V, V
CHGSNS
= V
BAT
= 4V, R
PROG
= 3.01k,
V
FB
= 2.29V (LTC4120), V
BATSNS
= 4V (LTC4120-4.2). Current into a pin is positive out of the pin is negative.
SYMBOL
I
LOWBAT
V
LOWBAT
PARAMETER
Low Battery Linear Charge Current
Low Battery Threshold Voltage
CONDITIONS
0V < V
FB
< V
TRKL
, V
BAT
= 2.6V (LTC4120),
V
BATSNS
< V
TRKL_4.2
, V
BAT
= 2.6V (LTC4120-4.2)
V
BAT
Rising (LTC4120),
V
BATSNS
Rising (LTC4120-4.2)
Hysteresis
I
TRKL
Switch Mode Trickle Charge Current
PROG Pin Servo Voltage in Switch Mode
Trickle Charge
V
TRKL
V
TRKL_4.2
h
C/10
Trickle Charge Threshold
Hysteresis
Trickle Charge Threshold
Hysteresis
End of Charge Indication Current Ratio
Safety Timer Termination Period
Bad Battery Termination Timeout
Switcher
f
OSC
t
MIN(ON)
Switching Frequency
Minimum Controllable On-Time
Duty Cycle Maximum
Top Switch R
DS(ON)
Bottom Switch R
DS(ON)
I
PEAK
I
SW
Peak Current Limit
Switch Pin Current (Note 8)
FREQ = INTV
CC
FREQ = GND
(Note 9)
(Note 9)
I
SW
= –100mA
I
SW
= 100mA
Measured Across R
SNS
with a 15µH Inductor in
Series with R
SNS
(Note 9)
V
IN
= Open-Circuit, V
RUN
= 0V, V
SW
= 8.4V (LTC4120)
l
l
V
IN
= Open-Circuit, V
RUN
= 0V, V
SW
= 4.2V
(LTC4120-4.2)
I = 2mA
V = 43V, Pin High Impedance
Rising V
NTC
Threshold
Falling V
NTC
Threshold
Falling V
NTC
Threshold
Rising V
NTC
Threshold
Falling V
NTC
Threshold
Rising V
NTC
Threshold
V
NTC
= V
INTVCC
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
6
2.15
TYP
9
2.21
147
I
CHG
/10
122
MAX
16
2.28
UNITS
mA
V
mV
mA
mV
V
LOWBAT
< V
BAT
, V
FB
< V
TRKL
(LTC4120) (Note 5),
V
LOWBAT
< V
BATSNS
< V
TRKL_4.2
(LTC4120-4.2)
V
LOWBAT
< V
BAT
, V
FB
< V
TRKL
(LTC4120) (Note 5),
V
LOWBAT
< V
BATSNS
< V
TRKL_4.2
(LTC4120-4.2)
V
FB
Rising (LTC4120) (Note 5)
V
FB
Falling (LTC4120) (Note 5)
V
BATSNS
Rising (LTC4120-4.2)
V
BATSNS
Falling (LTC4120-4.2)
(Note 6)
1.3
19
1.0
0.5
94
l
l
1.64
2.86
1.68
50
2.91
88
0.1
2.0
30
1.5
0.75
120
0.8
0.5
1.71
2.98
V
mV
V
mV
mA/mA
2.8
42
2.0
1.0
Hours
Minutes
MHz
MHz
ns
%
Ω
Ω
585
750
15
7
1250
30
15
mA
µA
µA
Status Pins
FAULT, CHRG
Pin Output Voltage Low
Pin Leakage Current
NTC
Cold Temperature V
NTC
/V
INTVCC
Fault
Hot Temperature V
NTC
/V
INTVCC
Fault
NTC Disable Voltage
NTC Input Leakage Current
73
35.5
1
–50
74
72
36.5
37.5
2
3
75
37.5
3
50
%INTV
CC
%INTV
CC
%INTV
CC
%INTV
CC
%INTV
CC
%INTV
CC
nA
500
0
1
mV
µA
4
4120ff
For more information
www.linear.com/LTC4120
LTC4120/LTC4120-4.2
ELECTRICAL CHARACTERISTICS
SYMBOL
RUN
V
EN
Enable threshold
Hysteresis
Run Pin Input Current
V
SD
FREQ
FREQ Pin Input Low
FREQ Pin Input High
FREQ Pin Input Current
Dynamic Harmonization Control
V
IN(DHC)
Input Regulation Voltage
DHC Pin Current
V
DHC
= 1V, V
IN
< V
IN(DHC)
14
330
V
mA
RMS
V
INTVCC
-V
FREQ
0V < V
FREQ
< V
INTVCC
l
l
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
= V
RUN
= 15V, V
CHGSNS
= V
BAT
= 4V, R
PROG
= 3.01k,
V
FB
= 2.29V (LTC4120), V
BATSNS
= 4V (LTC4120-4.2). Current into a pin is positive out of the pin is negative.
PARAMETER
CONDITIONS
V
RUN
Rising
V
RUN
Falling
V
RUN
= 40V
V
RUN
Falling
l
l
MIN
2.35
TYP
2.45
200
0.01
MAX
2.55
0.1
1.2
UNITS
V
mV
µA
V
mV
V
Shutdown Threshold (Note 3)
Hysteresis
0.4
220
0.4
0.6
±1
V
µA
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 LTC4120 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC4120E is guaranteed to meet performance specifications
for junction temperatures from 0°C to 85°C. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC4120I is guaranteed over the full –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.
Note 3:
Standby mode occurs when the LTC4120 stops switching due
to an NTC fault condition, or when the charge current has dropped low
enough to enter Burst Mode operation. Disabled mode occurs when V
RUN
is between V
SD
and V
EN
. Shutdown mode occurs when V
RUN
is below V
SD
or when the differential undervoltage lockout is engaged. SLEEP mode
occurs after a timeout while the battery voltage remains above the V
RCHG
or V
RCHG_42
threshold.
Note 4:
The internal supply INTV
CC
should only be used for the NTC
divider, it should not be used for any other loads.
Note 5:
The FB pin is measured with a resistance of 588k in series with
the pin.
Note 6:
h
C/10
is expressed as a fraction of measured full charge current as
measured at the PROG pin voltage when the
CHRG
pin de-asserts.
Note 7:
In an application circuit with an inductor connected from SW to
CHGSNS, the total battery leakage current when disabled is the sum of
I
BAT
, I
FBG(LEAK)
and I
SW
(LTC4120), or I
BATSNS
and I
BAT
and I
SW
(LTC4120-
4.2).
Note 8:
When no supply is present at IN, the SW powers IN through
the body diode of the topside switch. This may cause additional SW pin
current depending on the load present at IN.
Note 9:
Guaranteed by design and/or correlation to static test.
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