60V Battery Gas Gauge Product Guide Datasheet by Analog Devices Inc.
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Battery Gas Gauges and Power Monitors
1.7 LT02944
Total Charge Error vs
Differential Sense Voltage
m l m
VsENsE lmV)
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mu
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ANALOG
DEVICES
The LTC
®
2944 multicell battery gas gauge makes direct measurements of 3.6V to 60V battery stacks. Absolutely no level shifting
circuitry is required to interface with multicell voltages, minimizing current consumption and preserving measurement accuracy.
The LTC2944 is a true high voltage gas gauge that measures charge, voltage, current and temperature to within 1% accuracy —
all of the essential parameters required to accurately assess battery state of charge (SOC).
Features
n
Measures Accumulated Battery Charge and Discharge
n
3.6V to 60V Operating Range for Multicell Applications
n
16-Bit ADC Measures Voltage, Current and Temperature
n
1% Charge, Voltage, Current and Temperature Accuracy
n
I2C/SMBus Interface
n
Configurable Alert Output/Charge Complete Input
n
Quiescent Current <150µA
n
Small 8-Pin 3mm × 3mm DFN Package
60V Battery Gas Gauge
Battery Gas Gauges and Power Monitors
Total Charge Error vs
Differential Sense Voltage
VSENSE (mV)
0.1
–2.0
CHARGE ERROR (%)
0
–0.5
–1.0
–1.5
1.5
1.0
0.5
2.0
1 10 100
VSENSE+ = 30V
Part Number
Operating
Range (V) Interface
Integrated
Sense
Resistor
Measures
Energy Charge Power Voltage Current Temperature
LTC2941/LTC2941-1 2.7 to 5.5 I2C –/1A •
LTC2942/LTC2942-1 2.7 to 5.5 I2C –/1A • • •
LTC2943/LTC2943-1 3.6 to 20 I2C –/1A • • • •
LTC2944 3.6 to 60 I2C• • • •
LTC4151 7 to 80 I2C• •
LTC2945 0 to 80 I2C•••
LTC2946 0 to 100 I2C••••• •
LTC2947 0 to 15 I2C 30A • • • • • •
LTC4150 2.7 to 8.5 Interrupt •
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc.
All other trademarks are the property of their respective owners.
Battery Chargers for MulticeH Applications
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ANALOG
DEVICES
L7LJ!1N%
The LTC4000 is a high voltage controller and power manager that converts virtually any externally compensated DC/DC power supply
into a full-featured battery charger. The LTC4000 is capable of driving typical DC/DC converter topologies, including buck, boost, buck-
boost, SEPIC and flyback. The device offers precision input and charge current regulation and operates across a wide 3V to 60V input
and output voltage range, making it compatible with a variety of input voltage sources, battery stacks and chemistries including lithium-
ion/polymer/phosphate and sealed lead-acid (SLA). Typical applications include high power battery charger systems, high performance
portable instruments, battery backup systems, industrial battery-equipped devices and notebook/subnotebook computers.
Power Management Multicell Battery Chargers
Battery Chargers for Multicell Applications
L
LTC2944
SENSE+
ALCC
SDA
SCL SENSE–
GND
1.13M
14.7k
47k
10k
1.15M
47nF
5mΩ
VOUT
30.4V, 15A
33V TO 60V
Si7135DP
47k
CSN
CSP
BGATE
IGATE
BAT
OFB
FBG
BFB
NTC
CX
ITH CC IID
5mΩ
LT3845A
100µF
OUT
VC
SHDN
IN
RST
CLN
IN
ENC
CHRG
F LT
VM
IIMON
IBMON
22.1k
TMR GND BIASCL
24.9k
1µF
1.10M
100k
10nF
10nF
1µF0.1µF
Si7135DP
2k2k 2k
0.5A
LOAD
RSENSE
100mΩ
30V
LI-ION
BATTERY
+
1µF
3.3V
L
LTC4000
VDD
µP
Part Number
Maximum
Charge
Current (A)
VBAT
Range
(V)
Battery
Chemistry
Number of
Battery
Cells (Series)
Input
Voltage
(V)
Integrated
Power
Transistor Synchronous
Charge
Termination
Package
(mm × mm)
Switch Mode Multichemistry Buck (Step-Down) Battery Chargers
LTC4121 0.4 3.6 to 18 SLA
LiFePO4
Li-Ion
SLA
1-5 LiFePO4
1-4 Li-Ion
4.3 to 40 ~ ~ Timer 3×3 QFN-16
LT3652 2 3.3 to
14.4
SLA
LiFePO4
Li-Ion
SLA
1-4 LiFePO4
1-3 Li-Ion
4.9 to 32†~–Timer or C/10 3×3 DFN-12,
MSOP-12E
LT3652HV 2 3.3 to 18 SLA
LiFePO4
Li-Ion
SLA
1-5 LiFePO4
1-4 Li-Ion
4.9 to 34†~–Timer or C/10 3×3 DFN-12,
MSOP-12E
LTC4009/LTC4009-1‡/
LTC4009-2‡42 to 28 NiMH NiCd
SLA Li-Ion
2-18 Ni,
1-6 Li-Ion
6 to 28 –~External µC 4×4 QFN-20
LTC4012/LTC4012-1‡/
LTC4012-2‡/LTC4012-3
42 to 28 NiMH NiCd
SLA Li-Ion
2-18 Ni,
1-6 Li-Ion
6 to 28 –~External µC 4×4 QFN-20
LTC4015 15+§Up to 35 SLA
LiFePO4
Li-Ion
SLA
1-9 LiFePO4
1-8 Li-Ion
4.5 to 35 –~Timer + C/X 5×7 QFN-38
LTC4000#/LTC4000-1#$ 50§3 to 60 SLA
LiFePO4
Li-Ion
SLA
1-16 LiFePO4
1-14 Li-Ion
3 to 60@– – Timer + C/X 4×5 QFN-28
SSOP-28
Switch Mode Multichemistry Buck-Boost Battery Chargers
LTC4020 20+§2.5 to 55 LiFePO4
Li-Ion
1-15 LiFePO4
1-13 Li-Ion
4.5 to 55 –~Timer + C/X 5×7 QFN-38
Switch Mode Li-Ion Buck (Step-Down) Battery Chargers
LTC4001/LTC4001-1* 2 4.2 Li-Ion 1 4 to 5.5 ~ ~ Timer 3×3 QFN-16
LT3650-4.1/LT3650-4.2 2 4.1, 4.2 Li-Ion 1 4.75 to 32†
(40 Max)
~–Timer + C/10 3×3 DFN-12
MSOP-12E
LT3650-8.2/LT3650-8.4 2 8.2, 8.4 Li-Ion 2 9 to 32†
(40 Max)
~–Timer + C/10 3×3 DFN-12
MSOP-12E
LT3651-4.1/LT3651-4.2 4 4.1, 4.2 Li-Ion 1 6.5 to 32 ~ ~ Timer + C/10 5×6 QFN-36
LT3651-8.2/LT3651-8.4 4 8.2, 8.4 Li-Ion 2 9 to 32 ~ ~ Timer + C/10 5×6 QFN-36
† Minimum start-up voltage is +3.3V above VBATMAX ‡ -1 and -2 versions are fixed voltage options for 1-4 Li-Ion cells $ -1 option has MPPC (Maximum Power Point Control) * 4.1V cell voltage
# Charging controller requires externally compensated switching regulator § Depends on external components @ Greater than 60V is possible without the input current regulation/measurement function
0815
www.linear.com/LTC2944 n 1-800-4-LINEAR
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