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Linear Technology Electronic Components Datasheet

LTC4064EMSE Datasheet

Monolithic Linear Charger

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LTC4064
Monolithic Linear Charger
for Back-Up Li-Ion Batteries
FEATURES
Preset 4V Charge Voltage with 1% Accuracy
Prolongs 4.2V Li-Ion Battery Lifetime
Automatic Recharge
Thermal Regulation Maximizes Charging Rate
without Risk of Overheating*
No MOSFET, Sense Resistor or Blocking Diode
Required
Programmable Charge Termination Timer
Thermistor Input for Temperature Qualified Charging
Programmable Charge Current with 7% Accuracy
C/10 Charge Current Detection Output
25µA Supply Current in Shutdown Mode
Charge Current Monitor Useful for Gas Gauging*
Charges Directly from USB Port
Tiny Thermally Enhanced 10-pin MSOP Package
U
APPLICATIO S
File Servers, RAID Systems
Storage Products
Li-Ion Battery Back-Up
DESCRIPTIO
The LTC4064 is a standalone linear charger optimized for
prolonging the life of 1-cell Li-ion batteries in battery back-
up applications. By charging to a float voltage of 4V
instead of 4.2V or 4.1V, the LTC4064 decelerates the aging
process and capacity degradation when the battery is
unused for long periods of time but must be in a ready
state.
An external capacitor programs a safety timer to terminate
the charge cycle while the charge current is set externally
with a single resistor. When the input supply is removed,
the LTC4064 automatically enters a low current sleep
mode, dropping the battery drain current to less than 3µA.
Additional safety features designed to maximize battery
lifetime and reliability include NTC temperature sensing
and low battery charge conditioning (trickle charging).
The IC contains an on-chip power MOSFET and eliminates
the need for an external sense resistor and blocking diode.
The LTC4064 also includes C/10 detection circuitry, AC
present logic, and fault detection circuitry.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent No. 6522118
TYPICAL APPLICATIO
Standalone Back-Up Li-Ion Battery Charger
VIN = 5V
8
2
SHDN VCC
4.7µF
BAT 9
LTC4064
4 TIMER PROG 7
GND NTC
0.1µF 5, 11 6
IBAT = 1A
VFLOAT = 4V
1-CELL
Li-Ion
1.5k BATTERY*
1%
4064TA01
*AN OUTPUT CAPACITOR MAY BE REQUIRED
DEPENDING ON BATTERY LEAD LENGTH
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1


Linear Technology Electronic Components Datasheet

LTC4064EMSE Datasheet

Monolithic Linear Charger

No Preview Available !

LTC4064
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VCC) ..................................... 10V
BAT ......................................................................... 10V
NTC, SHDN, TIMER, PROG ............ –0.3V to VCC + 0.3V
CHRG, FAULT, ACPR ................................ –0.3V to 10V
BAT Short-Circuit Duration .......................... Continuous
BAT Current (Note 2) ............................................. 1.3A
PROG Current (Note 2) ....................................... 1.3mA
Junction Temperature .......................................... 125°C
Operating Temperature Range (Note 3) ...–40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
CHRG 1
VCC 2
FAULT 3
TIMER 4
GND 5
TOP VIEW
11
10 ACPR
9 BAT
8 SHDN
7 PROG
6 NTC
MSE EXPOSED PAD PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W (Note 4)
EXPOSED PAD IS GND, (PIN 11)
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC4064EMSE
MSE PART MARKING
LTAHQ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V
SYMBOL
VCC
ICC
VFLOAT
IBAT
ITRIKL
VTRIKL
VTRIKL
VUV
VUV
VMSD
VASD
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply Voltage
4.25
6.5
V
VCC Supply Current
Charger On; Current Mode; RPROG = 30k (Note 5)
Shutdown Mode; VSHDN = 0V
Sleep Mode VCC < VBAT or VCC 4V
1
2
mA
25
50
µA
25
50
µA
VBAT Regulated Float Voltage
3.96 4.00 4.04
V
Battery Pin Current
RPROG = 3k; Current Mode
465
500
535
mA
RPROG = 15k; Current Mode
93
100 107
mA
Shutdown Mode; VSHDN = 0V
±1
±3
µA
Sleep Mode VCC < VBAT or VCC < (VUV VUV)
±1
±3
µA
Trickle Charge Current
VBAT < 2V; RPROG = 3k
35
50
65
mA
Trickle Charge Trip Threshold Voltage VBAT Rising
2.48
V
Trickle Charge Trip Hysteresis Voltage
100
mV
VCC Undervoltage Lockout Voltage
VCC Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
VCC Rising
SHDN Pin Voltage
4
4.25
V
200
mV
0.6
1.3
V
Automatic Shutdown Threshold Voltage (VCC - VBAT) High to Low
(VCC - VBAT) Low to High
35
mV
70
mV
2
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Part Number LTC4064EMSE
Description Monolithic Linear Charger
Maker Linear
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