Linear Technology LTC4070EDDB Demo Board, Simple Low-Iq Battery Charger/Protector with NTC Thermistor Input DC1584A DC1584A 数据表
产品代码
DC1584A
LTC4070
1
4070fc
Typical applicaTion
DescripTion
Li-Ion/Polymer Shunt
Battery Charger System
The LTC
®
4070 allows simple charging of Li-Ion/Polymer
batteries from very low current, intermittent or continuous
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 harvesting
applications where charging sources may be intermittent
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%
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,
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.
FeaTures
applicaTions
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
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
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners..
NTC Overtemperature Battery Float
Voltage Qualifying
Simple Shunt Charger with Load Disconnect
and NTC Conditioning
TEMPERATURE (°C)
V
F
(V)
4.3
4.2
4.0
4.1
3.9
3.8
3.7
40
20
0
60
4070 TA01b
80
100
ADJ = V
CC
ADJ = FLOAT
ADJ = GND
4070 TA01a
LTC4070
ADJ
R
IN
GND
T
10k
Li-Ion
NTCBIAS
LBO
NTC
V
CC
V
IN
+
NTHS0805N02N1002F
Q1:FDR8508