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Analog Devices Semiconductor Electronic Components Datasheet

LTC4070IMS8E Datasheet

Li-Ion/Polymer Shunt Battery Charger

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FEATURES
n Low Operating Current (450nA)
n 1% Float Voltage Accuracy Over Full Temperature
and Shunt Current Range
n 50mA Maximum Internal Shunt Current
(500mA with External PFET)
n Pin Selectable Float Voltage Options:
4.0V, 4.1V, 4.2V
n Ultralow Power Pulsed NTC Float Conditioning for
Li-Ion/Polymer Protection
n Suitable for Intermittent, Continuous and Very Low
Power Charging Sources
n Low and High Battery Status Outputs
n Simple Low Voltage Load Disconnect Application
n Thermally Enhanced, Low Profile (0.75mm)
8-Lead (2mm × 3mm) DFN and MSOP Packages
APPLICATIONS
n Low Power Li-Ion/Polymer Battery Back-Up
n Solar Power Systems with Back-Up
n Memory Back-Up
n Embedded Automotive
n Thin Film Batteries
n Energy Scavenging/Harvesting
All registered trademarks and trademarks are the property of their respective owners.
LTC4070
Li-Ion/Polymer Shunt
Battery Charger System
DESCRIPTION
The LTC®4070 allows simple charging of Li-Ion/Polymer
batteries from very low current, intermittent or continu-
ous charging sources. The 450nA to 50mA operating cur-
rent makes charging possible from previously unusable
sources. With the addition of an external pass device,
shunt current may be boosted to 500mA. Stacked cell high
voltage battery packs are inherently balanced with shunt
charging. With its low operating current, the LTC4070 is
well suited to charge thin film batteries in energy harvest-
ing applications where charging sources may be intermit-
tent or very low power. The unique architecture of the
LTC4070 allows for an extremely simple battery charger
solution; requiring just one external resistor.
The LTC4070 offers a pin selectable float voltage with 1%
accuracy across the full range of operating temperature
and shunt current. The integrated thermal battery quali-
fier extends battery lifetime and improves reliability by
automatically reducing the battery float voltage at NTC
thermistor temperatures above 40°C. The LTC4070 also
provides both low and high battery status outputs. For
applications requiring pack protection, see LTC4071.
The device is offered in two thermally enhanced packages,
a compact low profile (0.75mm) 8-lead (2mm × 3mm)
DFN and an 8-lead MSOP package.
TYPICAL APPLICATION
Simple Shunt Charger with Load Disconnect
and NTC Conditioning
VIN
RIN
Q1:FDR8508
VCC
ADJ
LBO
NTCBIAS
LTC4070
NTC
GND
10k
+
T
Li-Ion
NTHS0805N02N1002F
4070 TA01a
NTC Overtemperature Battery Float
Voltage Qualifying
4.3
4.2 ADJ = VCC
4.1 ADJ = FLOAT
4.0 ADJ = GND
3.9
3.8
3.7
0
20
40
60
80 100
TEMPERATURE (°C)
4070 TA01b
Document Feedback
For more information www.analog.com
Rev. D
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC4070IMS8E Datasheet

Li-Ion/Polymer Shunt Battery Charger

No Preview Available !

LTC4070
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
ICC........................................................................ ±60mA
ADJ, NTC, NTCBIAS, DRV, LBO, HBO
Voltages............................................–0.3V to VCC + 0.3V
Operating Junction Temperature Range... –40°C to 125°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range................... –65°C to 150°C
Peak Reflow Temperature...................................... 260°C
PIN CONFIGURATION
TOP VIEW
NTCBIAS 1
8 VCC
NTC 2
7 DRV
9
ADJ 3
6 LBO
HBO 4
5 GND
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED,
MUST BE SOLDERED TO PCB, GND TO OBTAIN θJA
TOP VIEW
NTCBIAS 1
8 VCC
NTC 2
ADJ 3
9
7 DRV
6 LBO
HBO 4
5 GND
MS8E PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 9) IS NOT INTERNALLY CONNECTED,
MUST BE SOLDERED TO PCB, GND TO OBTAIN θJA
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4070EDDB#TRMPBF LTC4070EDDB#TRPBF LFPD
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LTC4070IDDB#TRMPBF LTC4070IDDB#TRPBF LFPD
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LTC4070EMS8E#TRMPBF LTC4070EMS8E#TRPBF LTFMT
8-Lead Plastic MSOP
–40°C to 125°C
LTC4070IMS8E#TRMPBF LTC4070IMS8E#TRPBF LTFMT
8-Lead Plastic MSOP
–40°C to 125°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.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range. VNTC = VCC, TA = 25°C unless otherwise specified. Current into a pin is positive and current out of a pin is
negative. All voltages are referenced to GND unless otherwise noted. (Note 2)
SYMBOL
VFLOAT
ICCMAX
ICCQ
ICCQLB
PARAMETER
Programmable Float Voltage
10µA ≤ ICC ≤ 50mA
Maximum Shunt Current
VCC Operating Current
Low Bat VCC Operating Current
CONDITIONS
VADJ = 0V
VADJ = Float
VADJ = VCC
VCC > VFLOAT
VHBO Low
VCC = 3.1V
MIN
l 3.96
l 4.06
l 4.16
l
50
l
TYP MAX
4.0
4.04
4.1
4.14
4.2
4.24
450 1040
300
UNITS
V
V
V
mA
nA
nA
Rev. D
2
For more information www.analog.com


Part Number LTC4070IMS8E
Description Li-Ion/Polymer Shunt Battery Charger
Maker Analog Devices
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