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LTC4079EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC4079
1
4079f
For more information www.linear.com/LTC4079
Typical applicaTion
FeaTures DescripTion
60V, 250mA Linear Charger
with Low Quiescent Current
The LT C
®
4079 is a low quiescent current, high voltage
linear charger for most battery chemistry types including
Li-Ion/Polymer, Lead-Acid or NiMH battery stacks up to
60V. The maximum charge current is adjustable from
10mA to 250mA with an external resistor. The battery
charge voltage is set using an external resistor divider.
With an integrated power device, current sensing and
reverse current protection, a complete charging solution
using the LTC4079 requires very few external components.
Thermal regulation ensures maximum charge current up to
the specified limit without the risk of overheating. Charging
can be terminated by either C/10 or adjustable timer.
Input voltage regulation reduces charge current when
the input voltage falls to an adjustable level or the battery
voltage, making it well suited for energy harvesting
applications. Other features include temperature qualified
charging, bad battery detection, automatic recharge with
sampled feedback in standby for negligible battery drain,
and an open-drain CHRG status output. The device is
offered in a compact, thermally enhanced 10-lead (3mm
× 3mm) DFN package.
applicaTions
n
Wide Input Voltage Range: 2.7V to 60V
n
Adjustable Battery Voltage: 1.2V to 60V
n
Adjustable Charge Current: 10mA to 250mA
n
Low Quiescent Current While Charging: I
IN
= 4µA
n
Ultralow Battery Drain When Shutdown or Charged:
I
BAT
< 0.01µA
n
Auto Recharge
n
Input Voltage Regulation for High Impedance Sources
n
Thermal Regulation Maximizes Output Current
without Overheating
n
Constant Voltage Feedback with ±0.5% Accuracy
n
NTC Thermistor Input for Temperature Qualified
Charging
n
Adjustable Safety Timer
n
Charging Status Indication
n
Thermally Enhanced 10-Lead (3mm × 3mm)
DFN Package
n
Embedded Automotive and Industrial
n
Backup Battery Charging from Another Battery
n
Energy Harvesting Charger
n
Thin Film Battery Products
L, LT , LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Charging a Backup Battery
Li-Ion Battery Charge Cycle
+
IN
1µF
1.54M
249k
10k3.01k
10k Li-Ion
4079 TA01a
BAT9V TO 60V 8.4V
EN FB
CHRG FBG
PROG
T
NTCBIAS
TIMER NTC
GND
LTC4079
TIME (HOURS)
0
I
BAT
(mA)
V
BAT
(V)
80
100
120
6 73 4 5
4079 TA01b
60
40
1 2 8
20
0
140
8.0
8.2
8.4
7.8
7.6
7.4
7.2
8.6
V
BAT
I
BAT
500mAh 2-CELL LI-ION
C/10
TERMINATION
LTC4079
2
4079f
For more information www.linear.com/LTC4079
pin conFiguraTionabsoluTe MaxiMuM raTings
IN, BAT, EN, CHRG, FB, FBG Voltage .......... –0.3V to 62V
PROG TIMER Voltage .................................................. 3V
BAT Current....................................................... –400mA
PROG Current .....................................................–1.6mA
FBG Current .............................................................2mA
CHRG Current ..........................................................2mA
Operating Junction Temperature Range
(Notes 3, 5) ................................................ –40 to 125°C
Storage Temperature Range ......................–65 to 150°C
(Notes 1, 2)
TOP VIEW
11
GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
BAT
FB
FBG
CHRG
TIMER
IN
EN
PROG
NTCBIAS
NTC
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4079EDD#PBF LTC4079EDD#TRPBF LGNQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC4079IDD#PBF LTC4079IDD#TRPBF LGNQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LT C Marketing for information on nonstandard 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/
LTC4079
3
4079f
For more information www.linear.com/LTC4079
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at
T
A
= 25°C (Notes 2, 3). V
IN
= 12V, V
BAT
= 7.4V, V
FB
= 1.057V, V
EN
= 12V, R
PROG
= 3k (100mA charge current) unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Supply Voltage
l
2.7 60 V
V
BAT
Battery Voltage Range
l
60 V
V
UVLO
V
IN
Undervoltage Lockout V
IN
Rising
Hysteresis
l
2.55
140
2.7 V
mV
V
DUVLO
Differential Undervoltage Lockout V
IN
-V
BAT
Rising
Hysteresis
l
–20 15
80
50 mV
mV
V
DVREG
Differential Voltage Regulation Minimum V
IN
-V
BAT
for Charge Current
l
120 160 200 mV
I
Q(IN)
Input Supply Quiescent Current Charging (Note 4)
Charging Terminated (V
FB
= 1.210V)
Shutdown (EN = 0)
l
l
4
2
0.2
9
4
0.6
µA
µA
µA
I
Q(BAT)
Battery Drain Current Charging Terminated (V
FB
=1.210V)
Shutdown (EN = 0)
V
IN
= 0 or IN open
0.01
0.00
0.05
0.2
0.2
0.2
µA
µA
µA
Charging Functions
V
FB(CHG)
Feedback Pin Regulation Voltage in Constant-
Voltage Charge Mode
l
1.165
1.156
1.170
1.170
1.175
1.184
V
V
PROG Pin Regulated V
oltage Constant-Current Mode 1.190 V
Ratio of BAT Current to PROG Pin Current 250 mA/mA
I
CHG
Battery Charge Current in Constant-Current
Mode (Note 5)
R
PROG
= 1.2k
R
PROG
= 3k
R
PROG
= 30k
l
l
l
236
93
8.5
248
99
10
260
105
11.5
mA
mA
mA
I
TERMINATE
Charging Termination Threshold R
PROG
= 1.2k
R
PROG
= 3k
R
PROG
= 30k
l
l
l
22
8.2
0.7
25
10
1
28
11.8
1.3
mA
mA
mA
t
TERMINATE
Deglitch Filter on C/10 Charge Termination I
CHG
Drops Below Termination Threshold 5 9 13 ms
t
TIMER
Safety Timer Accuracy –10 10 %
V
RECHRG
Recharge Threshold Voltage of FB Pin Relative to V
FB(CHG)
with V
FB
Falling 96.9 97.6 98.3 %
V
FB(LOWBAT)
Low Battery Threshold V
FB
for Low Battery Detection
l
0.780 0.800 0.820 V
Low Battery Time Out (Percentage of Safety
Timer)
Charging with V
FB
< V
FB(LOWBAT)
18 %
R
ON
Resistance of the Charge Path 5 Ω
I
FB
Feedback Pin Leakage V
FB
= 1.170V (in Regulation)
V
FB
= 8.4V (in Shutdown)
l
l
0.1
0.1
20
100
nA
nA
I
FBG
Feedback Ground Pin Leakage V
FBG
= 8.4V, EN = 0
l
0.1 100 nA
R
FBG
Switch Resistance from FBG Pin to GND 160 Ω
Die Temperature (T
J
) at Thermal Regulation 118 °C
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LTC4079EDD#PBF

Mfr. #:
Buy LTC4079EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Low Iq 60V, 250mA Linear Charger
Lifecycle:
New from this manufacturer.
Delivery:
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