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PDF LTC4110 Data sheet ( Hoja de datos )
| Número de pieza | LTC4110 | |
| Descripción | Battery Backup System Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4110
Battery Backup
System Manager
FEATURES
n Complete Backup Battery Manager for Li-Ion/
Polymer, Lead Acid, NiMH/NiCd Batteries and
Super Capacitors
n Charge and Discharge Battery with Voltages Above
and Below the Input Supply Voltage
n “No Heat” Battery Calibration Discharge Using
System Load
n Automatic Battery Backup with Input Supply
Removal Using PowerPath™ Control
n Standalone for Li-Ion/Polymer, SLA, and Supercaps
n Optional SMBus/I2C Support Allows Battery
Capacity Calibration Operation with Host
n Over- and Under-Battery Voltage Protection
n Adjustable Battery Float Voltage
n Precision Charge Voltage ±0.5%
n Programmable Charge/Calibration Current Up to
3A with ±3% Accuracy
n Optional Temperature Qualified Charging
n Wide Backup Battery Supply Range: 2.7V to 19V
n Wide Input Supply Range: 4.5V to 19V
n 38-Lead (5mm × 7mm) QFN Package
APPLICATIONS
n Backup Battery Systems
n Server Memory Backup
n Medical Equipment
n High Reliability Systems
DESCRIPTION
The LTC®4110 is a complete single chip, high efficiency,
flyback battery charge and discharge manager with auto-
matic switchover between the input supply and the backup
battery or super capacitor. The IC provides four modes of
operation: battery backup, battery charge, battery calibra-
tion and shutdown. Battery backup and battery charge are
automatic standalone modes, while the optional calibration
mode requires a CPU host to communicate over an SMBus.
During calibration the flyback charger is used in reverse
to discharge the battery with a programmable constant
current into the system load eliminating heat generation.
Three status outputs can be individually reconfigured over
the SMBus to become GPIOs. User programmable over-
discharge protection is provided. The SHDN pin isolates
the battery to support shipping the product with a charged
battery installed.
Multiple LTC4110s can be combined to form a redundant
battery backup system or increase the number of battery
packs to achieve longer backup run times.
The LTC4110 is available in a low profile (0.75mm), 38-pin
5mm × 7mm QFN package. The QFN features an exposed
metal die mount pad for optimum thermal performance.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
Battery Backup System Manager
SYSTEM LOAD
DCIN
0V
BACKUP LOAD (DCOUT)
CURRENT FLOW
OFF ON ON
BATTERY
UVLO
SET POINT
INID
DCDIV
BATID
LTC4110 CHGFET
DCHFET
4110 F01
Server Backup System (In Backup Mode)
LTC4110
BATTERY
BACKUP
SYSTEM
MANAGER
HOST CPU
SYSTEM LOAD
(DC/DC, ETC.)
BACKUP LOAD
(MEMORY, ETC.)
CURRENT FLOW
BATTERY
I2C BUS
4110 TA01b
4110fa
1
1 page  
LTC4110
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Unless otherwise specified, VDCIN = VDCOUT = VDCDIV = 12V, VBAT = 8.4V,
GND = SGND = CLP = CLN = SHDN = 0V and RVREF = 49.9k. All currents into device pins are positive and all currents out of device pins
are negative. All voltages are referenced to GND, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
Input and Battery Ideal Diodes and Switches
VFR Forward Regulation Voltage (VDCIN-VDCOUT, 2.7V ≤ VDCIN ≤ 19V
VBAT -VDCOUT)
VREV Reverse Voltage Turn-Off Voltage
(VDCIN-VDCOUT, VBAT -VDCOUT)
2.7V ≤ VDCIN ≤ 19V
VGON
“ON” Gate Clamping Voltage (VDCIN-VINID,
VBAT -VBATID)
IINID, IBATID = 1μA
VGOFF
“OFF” Gate Voltage (VDCIN-VINID, VBAT -VBATID) IINID, IBATID = –10μA
VSHDN = 0V and VDCIN (Shutdown)
VFO BATID Fast-On Voltage Comparator Threshold IBATID > 500μA
tIIDON
tIIDOFF
INID Pin Delay Times
Turn “ON”
Turn “OFF”
CINID = 10nF
DCIN is Switched Between 12.2V and 11.8V
From DCOUT – VGOFF to DCOUT –6V
From DCOUT – VGON to DCOUT –1.5V
tBIDON
tBIDOFF
BATID Pin Delay Times
Turn “ON”
Turn “OFF”
CBATID = 2.5nF
BAT is Switched Between 12.2V and 11.8V
From DCOUT – VGOFF to DCOUT –6V
From DCOUT – VGON to DCOUT –1.5V
PWM Flyback Converter
l
l
VOHF
VOLF
VOLFX
CHGFET, DCHFET High
CHGFET, DCHFET Low
CHGFET, DCHFET in Shutdown and Backup
Modes
CHGFET, DCHFET Transition Times
tR Rise Time
tF Fall Time
FPWM
PWM Oscillator Switching Frequency
SafetySignal Decoder and Thermistor Interface
ICHGFET, IDCHFET = –1mA
ICHGFET, IDCHFET = 1mA
VDCIN = VDCDIV = VDCOUT = 0V (Shutdown
Mode), VDCIN = VDCDIV = 0V (Backup Mode)
ICHGFET, IDCHFET = 1μA
CLOAD = 1.6nF, 10% to 90%
CLOAD = 1.6nF, 10% to 90%
l
SSOR
SafetySignal Decoder
SafetySignal Trip
(RES_COLD/RES_OR)
RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB
= 54.9k ±1%.
l
Smart Batteries and Li-Ion Only
SSCLD
SafetySignal Decoder
SafetySignal Trip
(RES_IDEAL/RES_COLD)
RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB
= 54.9k ±1%
l
Smart Batteries and Li-Ion Only
SSIDL
SafetySignal Decoder
SafetySignal Trip
(RES_HOT/RES_IDEAL)
RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB
= 54.9k ±1%
l
Smart Batteries and Li-Ion Only
SSHOT
SafetySignal Decoder
SafetySignal Trip
(RES_UR/RES_HOT)
RTHA = 1130Ω ±1%, CTH = 1nF (Note 6) RTHB
= 54.9k ±1%
l
Smart Batteries and Li-Ion Only
VHOT THB Pin Hot Threshold Voltage
VTHB Decreasing; Lead Acid Only
l
VHOTH
VREM
THB Pin Hot Threshold Hysteresis Voltage
THB Pin Battery Removal Threshold Voltage
VTHB Increasing; Lead Acid Only
VTHB Increasing; Lead Acid Only
l
MIN
10
–30
7
45
4.5
255
95
28.5
2.85
425
0.28 •
VTHA
0.90 •
VTHA
TYP
20
–18
8.3
450
8
15
8
4.75
35
15
300
100
30
3
500
0.30 •
VTHA
50
0.94 •
VTHA
MAX
32
–8
9.7
0.25
100
700
20
60
20
5.25
50
100
65
65
340
105
31.5
3.15
575
0.36 •
VTHA
0.96 •
VTHA
UNITS
mV
mV
V
V
mV
μs
μs
μs
μs
V
mV
mV
ns
ns
kHz
k
k
k
Ω
V
mV
V
4110fa
5
5 Page 
BLOCK DIAGRAM
LTC4110
INID 38
DCIN 1
GND 39
VDD 34
CLP 3
CLN 2
DCDIV 5
VREF 17
VCHG 16
VCAL 15
VDIS 14
SELC 30
TYPE 19
SHDN 6
SDA 7
SCL 8
SELA 12
THA 20
THB 21
SUPPLY INPUT BATTERY
PowerPath CONTROLLER
VDD
REGULATOR
NUMBER
OF CELLS PRECISION
VOLTAGE DIVIDER
CA
CURRENT
SELECTION
CHG/DCH
SWITCH
CURRENT
EA
1.220
SWITCH
VOLTAGE REFERENCE
ANALOG COMPARATORS
AND SWITCHES
–
÷10
+
PWM
LOGIC
SMBus
INTERFACE
AND CONTROL
THERMISTOR
INTERFACE
PROGRAMMING CURRENT
OSC
UVLO
TIMER/
CONTROLLER
37 DCOUT
36 NC
35 BATID
31 BAT
27 CSN
26 CSP
22 IPCC
24 ICHG
23 ICAL
25 ITH
33 CHGFET
32 DCHFET
29 ISENSE
28 SGND
18 TIMER
4 ACPDLY
13 ACPb
9 GPIO1
10 GPIO2
11 GPIO3
4110 BD
4110fa
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4110.PDF ] | |
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