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Introducing the
LTC4071
Shunt Battery Charger System
with Low Battery Disconnect
2
Emerging Markets
• Power management for nontraditional energy sources
SuperCaps
Piezo-Electric
Elements
© 2006 Linear Technology
Organic Solar Cell
Thin film battery
Thermo-Electric
Generator
Micro Fuel Cell
3
LTC4071: What is It?
Shunt Battery Charger + Integrated Pack Protection
Shunt Battery
Charger System
With Low Battery
Disconnect
• Low Operating Current: 550nA
• 1% Float Voltage Accuracy Over Full Temperature and Shunt
Current Range
• 50mA Maximum Internal Shunt Current
• Pin Selectable Float Voltage Options: 4.0V, 4.1V. 4.2V
© 2006 Linear Technology
4
LTC4071: Key Technical Features
• Integrated Pack Protection in One IC
• Overvoltage (zener) and Undervoltage (Low Battery Disconnect)
• Low Operating Current: 550nA
• Pin Selectable Low Battery Disconnect Level: 2.7V or 3.2V
• 1% Float Voltage Accuracy Over Full Temperature and Shunt
Current Range
• 50mA Maximum Internal Shunt Current
• Pin Selectable Float Voltage Options: 4.0V, 4.1V. 4.2V
• Ultralow Power NTC Float Voltage Conditioning for LiIon/Polymer Protection
• Suitable for Very Low Power (Intermittent or Continuous)
Charging Sources
• High Battery Status Output
• Thermally Enhanced, Low Profile 8-Lead DFN (2mm x 3mm
x 0.75mm) and MSOP Packages
© 2006 Linear Technology
5
LTC4071: Features and Benefits
© 2006 Linear Technology
6
LTC4071: Features and Benefits - NTC (cont.)
© 2006 Linear Technology
7
LTC4071: Features and Benefits – NanoPower (cont.)
When the input supply is
removed and the battery
voltage is below the high
battery output threshold, the
LTC4071 consumes just
550nA from the battery.
This enables the device to
draw or harvest power from
previously unusable low
current, intermittent or
continuous power sources.
© 2006 Linear Technology
8
LTC4071: Packaging
* not to scale
© 2006 Linear Technology
9
LTC4071: Typical Application Circuits
Simple Single Cell
Li Charger
© 2006 Linear Technology
10
LTC4071: Typical Application Circuits (cont.)
Photovoltaic (Solar) Charger
2-Cell Stacked Battery
Charger
© 2006 Linear Technology
11
LTC4071: Positioning
Linear Tech
Linear Tech
Linear Tech
LTC4071
Shunt-based
Charger
LTC4070
Shunt-based
Charger
LTC4065L
Linear Charger current-limited LDO
Li-Ion/Polymer
Li-Ion/Polymer
Li-Ion/Polymer
Shunt/Float Voltage
4.0V, 4.1V, 4.2V
Maximum Shunt Current
50mA (10uA min)
4.0V, 4.1V, 4.2V
50mA (10uA min)
(500mA w/ ext PFET)
4.2V
Charge Current
250mA max
550nA (TYP)
1.2uA (max)
450nA (TYP)
1.04uA (max)
120uA (TYP)
250uA (max)
Yes
Yes, internal &
programmable
Yes
No
Yes, fixed,
ext PFET + R + 2 inverters
No
Yes, load & batt
ext PFET (load only)
No
Yes
Yes
No
Status Indicators
HBO
LBO, HBO
/CHRG
Thermal Battery Qualifier/NTC
Yes
Yes
No (thermal reg)
2mmx3mm DFN-8,
MSOP-8
$2.20
2mmx3mm DFN-8,
MSOP-8
$2.06
Part #
Topology
Battery Chemistry
Quiescent Current
Over-voltage Protection (zener)
Under-voltage Protection
(Low Battery Disconnect)
Load Disconnect
Battery Stack Compatible
Package
1k Price
© 2006 Linear Technology
2mmx2mm DFN-6
$1.10
12
LTC4071: Competition
Linear Tech
National, etc.
Various
LTC4071
Shunt-based
Charger
LM431
Shunt reference
(adjustable)
Various
Linear Charger
Li-Ion/Polymer
none
Li-Ion/Polymer
Shunt/Float Voltage
4.0V, 4.1V, 4.2V
2.5V to 36V
Maximum Shunt Current
50mA (10uA min)
10mA
various
Charge Current
1A max
550nA (TYP)
1.2uA (max)
0.4mA (TYP)
1mA (max)
>100uA (TYP)
Yes
Yes, internal &
programmable
No
some
No
No
Yes, load & batt
No
No
Yes
Yes
No
Status Indicators
HBO
No
various
Thermal Battery Qualifier/NTC
Yes
No
Yes
2mmx3mm DFN-8,
MSOP-8
$2.20
TO-92, SOT-23,
SOIC-8, SMD-4
$0.23
Part #
Topology
Battery Chemistry
Quiescent Current
Over-voltage Protection (zener)
Under-voltage Protection
(Low Battery Disconnect)
Load Disconnect
Battery Stack Compatible
Package
1k Price
© 2006 Linear Technology
various
cheap
13
LTC4071: End Markets/Applications
•
•
•
•
•
•
Low Power Li-Ion/Polymer Battery Back-Up
Energy Scavenging/Harvesting
Solar Power Systems with Back-Up
Memory Back-Up
Embedded Automotive
Thin Film Batteries
© 2006 Linear Technology