LINER LTC4097EDDB

LTC4097
USB/Wall Adapter
Standalone Li-Ion/Polymer
Battery Charger
FEATURES
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APPLICATIONS
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, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6522118.
TYPICAL APPLICATION
Complete Charge Cycle (1100mAh Battery)
Dual Input Battery Charger for Single-Cell Li-Ion Battery
800mA (WALL)
100mA/500mA (USB)
LTC4097
USB
PORT
BAT
1µF
1µF
2k
1%
DCIN
VNTC
USBIN
HPWR
IUSB
IDC
1.24k
1%
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge current
is programmed with an external resistor. The LTC4097
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4097 can be put
into shutdown mode reducing the DCIN supply current to
20µA, the USBIN supply current to 10µA, and the battery
drain current to less than 2µA even with power applied
to both inputs.
Other features include trickle charge, automatic recharge,
undervoltage lockout, charge status output, an NTC thermistor input used to monitor battery temperature and VNTC
power present output with 120mA drive capability.
Cellular Telephones
MP3 Players
Portable Handheld Devices
WALL
ADAPTER
The LTC®4097 is a standalone linear battery charger that
is capable of charging a single-cell Li-Ion or Li-Polymer
battery from both wall adapter and USB inputs. The charger
can detect power at the inputs and automatically select
the appropriate power source for charging.
+
4.2V
SINGLE CELL
Li-Ion BATTERY
NTC
ITERM
GND
2k
1%
T
4097 TA01
BATTERY
CHARGE
VOLTAGE (V) CURRENT (mA)
■
Charges Single-Cell Li-Ion/Polymer Battery from
Wall Adapter and USB Inputs
Automatic Input Detection (Wall Adapter Input has
Charging Priority)
Charge Current Programmable up to 1.2A from
Wall Adapter Input
Programmable Charge Current Termination
NTC Thermistor Input for Temperature Qualified
Charging
Independent DC, USB Charge Current Programming
Preset Float Voltage with ±0.6% Accuracy
Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
Charge Status Output
Automatic Recharge
20µA Charger Quiescent Current in Shutdown
Available in a Thermally Enhanced, Low Profile
(0.75mm) 12-Lead (3mm × 2mm) DFN Package
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
DCIN
VOLTAGE (V)
■
DESCRIPTION
5.0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
HPWR = 5V
2.5
0
0
0.5
1.0
2.0
1.5
TIME (HR)
2.5
3.0
4097 TA01b
4097f
1
LTC4097
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1,7)
VDCIN, VUSBIN
t < 1ms and Duty Cycle < 1% .................. –0.3V to 7V
Steady State............................................. –0.3V to 6V
BAT, ⎯C⎯H⎯R⎯G, NTC, HPWR, SUSP ................... –0.3V to 6V
IDC, IUSB, ITERM ............................–0.3V to VCC + 0.3V
BAT Short-Circuit Duration............................Continuous
VNTC Short-Circuit Duration .........................Continuous
DCIN, BAT Pin Current (Note 6) .............................1.25A
USBIN Pin Current (Note 6) .....................................1.1A
IDC, IUSB, ITERM Pin Current ............................1.25mA
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
TOP VIEW
DCIN 1
12 BAT
USBIN 2
11 GND
VNTC 3
CHRG 4
13
10 IDC
9 IUSB
SUSP 5
8 ITERM
NTC 6
7 HPWR
DDB PACKAGE
12-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W (Note 3)
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
DDB PART MARKING
LTC4097EDDB
LCRM
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
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. VDCIN = 5V, VUSBIN = 5V, HPWR = 5V, NTC = 0V, RIDC = 1kΩ, RIUSB = 2kΩ,
RITERM = 2kΩ unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VDCIN
Adapter Supply Voltage
●
4.25
VUSBIN
USB Supply Voltage
●
4.25
5.5
V
IDCIN
DCIN Supply Current
Charge Mode (Note 4), RIDC = 10k
Standby Mode; Charge Terminated
Shutdown Mode (SUSP = 5V)
●
●
250
50
20
800
100
40
µA
µA
µA
IUSBIN
USBIN Supply Current
Charge Mode (Note 5), RIUSB = 10k, VDCIN = 0V
Standby Mode; Charge Terminated, VDCIN = 0V
Shutdown (VDCIN = 0V, SUSP = 5V)
VDCIN > VUSBIN
●
●
250
50
20
10
800
100
40
20
µA
µA
µA
µA
VFLOAT
Regulated Output (Float) Voltage
IBAT = 1mA
IBAT = 1mA, 0°C < TA < 85°C
4.179
4.158
4.2
4.2
4.221
4.242
V
V
IBAT
BAT Pin Current
RIDC = 1.25k, Constant-Current Mode
RIUSB = 2.1k, Constant-Current Mode
RIUSB = 2.1k, Constant-Current Mode, HPWR = 0V
RIDC = 10k or RIUSB = 10k
Standby Mode, Charge Terminated
Shutdown Mode (Charger Disabled)
Sleep Mode (VDCIN = 0V, VUSBIN = 0V)
750
450
90
88
800
476
95
100
–5
–2
–5
850
500
100
112
–8
–4
–8
VIDC
IDC Pin Regulated Voltage
Constant-Current Mode, RIDC = 1.25k
VIUSB
IUSB Pin Regulated Voltage
Constant-Current Mode, RIUSB = 2k
Constant-Current Mode, RIUSB = 2k, HPWR = 0
ITERMINATE
Charge Current Termination
Threshold
RITERM = 1k
RITERM = 2k
RITERM = 10k
88
42
6
100
50
9.5
112
58
13
mA
mA
mA
ITRIKL
Trickle Charge Current
VBAT < VTRIKL; RIDC = 1k
VBAT < VTRIKL; RIUSB = 2k
85
42
100
50
115
58
mA
mA
5.5
UNITS
V
mA
mA
mA
mA
µA
µA
µA
1
V
1
0.2
V
V
4097f
2
LTC4097
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V, HPWR = 5V, NTC = 0V, RIDC = 1kΩ, RIUSB = 2kΩ,
RITERM = 2kΩ unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VTRIKL
Trickle Charge Threshold Voltage VBAT Rising
Hysteresis
2.8
2.9
135
3
V
mV
VUVDC
DCIN Undervoltage Lockout
Voltage
From Low to High
Hysteresis
4
4.22
200
4.4
V
mV
VUVUSB
USBIN Undervoltage Lockout
Voltage
From Low to High
Hysteresis
3.8
4
200
4.2
V
mV
VASD-DC
VDCIN – VBAT Lockout Threshold
Voltage
VDCIN from High to Low, VBAT = 4.3V
VDCIN from Low to High, VBAT = 4.3V
5
30
100
55
mV
mV
VASD-USB
VUSBIN – VBAT Lockout Threshold VUSBIN from High to Low, VBAT = 4.3V
Voltage
VUSBIN from Low to High, VBAT = 4.3V
5
30
150
55
mV
mV
VSUSP, VHPWR
VIL, Logic Low Voltage
0.5
V
●
VIH, Logic High Voltage
1.2
UNITS
V
RSUSP
SUSP Pulldown Resistance
●
3.4
MΩ
RHPWR
HPWR Pulldown Resistance
●
3.4
MΩ
V⎯C⎯H⎯R⎯G
⎯C⎯H⎯R⎯G Output Low Voltage
I⎯C⎯H⎯R⎯G = 5mA
ΔVRECHRG
Recharge Battery Threshold
Voltage
VFLOAT – VRECHRG
tRECHRG
Recharge Comparator Filter Time VBAT from High to Low
tITERM
Termination Comparator Filter Time IBAT Drops Below Termination Threshold
RON-DC
●
70
62
150
mV
100
130
mV
1.6
ms
3
ms
Power FET “ON” Resistance
(Between DCIN and BAT)
420
mΩ
RON-USB
Power FET “ON” Resistance
(Between USBIN and BAT)
470
mΩ
TLIM
Junction Temperature in
Constant-Temperature Mode
115
°C
IVNTC
VNTC Pin Current
VVNTC = 4.55V DCIN Powered
VVNTC = 4.8V USBIN Powered
30
30
mA
mA
VVNTC
VNTC Bias Voltage
IVNTC = 250µA
INTC
NTC Input Leakage Current
VNTC = 1V
VNTC-COLD
Cold Temperature Fault
Threshold Voltage
Rising Threshold
Hysteresis
0.765 • VVNTC
0.016 • VVNTC
V
V
VNTC-HOT
Hot Temperature Fault Threshold Falling Threshold
Voltage
Hysteresis
0.349 • VVNTC
0.016 • VVNTC
V
V
VNTC-DIS
NTC Disable Threshold Voltage
0.017 • VVNTC
0.01 • VVNTC
V
V
4.25
0
NTC Input Voltage to GND (Falling)
Hysteresis
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4097 is guaranteed to meet the performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Failure to correctly solder the Exposed Pad of the package to the
PC board will result in a thermal resistance much higher than 60°C/W. See
5.5
V
±1
µA
Thermal Considerations.
Note 4: Supply current includes IDC and ITERM pin current (approximately
100µA each) but does not include any current delivered to the battery
through the BAT pin.
Note 5: Supply current includes IUSB and ITERM pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin.
Note 6: Guaranteed by long term current density limitations.
Note 7: VCC is greater of DCIN or USBIN
4097f
3
LTC4097
TYPICAL PERFORMANCE CHARACTERISTICS
Battery Regulated Output (Float)
Voltage vs Charge Current
4.26
4.26
4.215
4.205
4.20
4.20
4.200
VBAT (V)
4.22
4.18
4.18
4.16
4.190
4.14
4.14
4.185
4.12
4.12
4.180
4.10
200
400
600
800 1000
CHARGE CURRENT (mA)
100
0
1200
200
300
400
500
CHARGE CURRENT (mA)
4097 G01
4.26
4.24
4.22
4.20
4.20
VBAT (V)
4.22
4.18
4.16
4.14
4.14
4.12
4.12
4.50
4.75
5.00
VDCIN (V)
5.25
600
400
200
0
4.50
4.75
5.00
VUSBIN (V)
5.25
1.006
VUSBIN = 5V
RIUSB = 2k
1.006
VDCIN = 5V
RIDC = 10k
1.002
1.002
VIUSB (V)
400
VIDC (V)
1.004
1.000
0.998
0.998
100
0.996
0.996
0.4
0.6
0.8
1.0
1.2
VIUSB (V)
4097 G07
1.0
0.994
–50
–25
0
25
50
TEMPERATURE (°C)
75
1.2
100
4097 G08
VUSBIN = 5V
RIUSB = 10k
1.000
200
0.2
0.6
0.8
VIDC (V)
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
1.004
0
0.4
4097 G06
500
0
0.2
0
5.50
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
300
VDCIN = 5V
RIDC = 1k
4097 G05
Charge Current vs IUSB Pin
Voltage
100
800
4097 G04
600
75
1000
4.10
4.25
5.50
1200
IBAT = 10mA
RIUSB = 2k
4.18
4.16
4.10
4.25
0
25
50
TEMPERATURE (°C)
Charge Current vs IDC Pin
Voltage
Battery Regulated Output (Float)
Voltage vs USBIN Voltage
IBAT = 10mA
RIDC = 1k
4.24
–25
4097 G03
IBAT (mA)
4.26
4.175
–50
600
4097 G02
Battery Regulated Output (Float)
Voltage vs DCIN Voltage
VBAT (V)
4.195
4.16
0
VDCIN = 5V
RIDC = 1k
VUSBIN = 5V
RIUSB = 2k
4.210
4.22
4.10
IBAT (mA)
Battery Regulated Output (Float)
Voltage vs Temperature
VUSBIN = 5V
RIUSB = 2k
4.24
VBAT (V)
VBAT (V)
Battery Regulated Output (Float)
Voltage vs Charge Current
VDCIN = 5V
RIDC = 1k
4.24
NTC = 0V, HPWR = 5V, TA = 25°C,
unless otherwise noted.
0.994
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G09
4097f
4
LTC4097
TYPICAL PERFORMANCE CHARACTERISTICS
IDC Pin Voltage vs VDCIN
(Constant-Current Mode)
1.006
NTC = 0V, HPWR = 5V, TA = 25°C,
unless otherwise noted.
Recharge Threshold Voltage
vs Temperature
IUSB Pin Voltage vs VUSBIN
(Constant-Current Mode)
1.006
VBAT = 3.7V
RIDC = 10k
1.004
1.004
1.002
1.002
120
VBAT = 3.7V
RIUSB = 10k
VDCIN = VUSBIN = 5V
115
1.000
∆VRECHRG (mV)
VIUSB (V)
VIDC (V)
110
1.000
0.998
0.998
0.996
0.996
105
100
95
90
0.994
4.25
4.50
4.75
5.00
VDCIN (V)
5.25
5.50
85
0.994
4.25
4.50
4.75
5.00
VUSBIN (V)
5.25
4097 G10
VDCIN = 5V
RIDC = 1k
575
THERMAL REGULATION
IBAT (mA)
IBAT (mA)
100
1200
VUSBIN = 5V
RIUSB = 2k
RIDC = 1k
THERMAL REGULATION
1000
550
1000
500
475
900
450
850
425
800
3.0
3.2
3.4
3.6
VBAT (V)
3.8
800
525
950
400
3.0
4.0
600 R
IUSB = 2k
400
3.2
3.4
3.6
VBAT (V)
3.8
4097 G13
VDCIN = 5V
200 VUSBIN = 5V
VBAT = 3.7V
θJA = 60°C/W
0
–50 –25
0
25
50
75
TEMPERATURE (°C)
4.0
100
4097 G14
Charge Current vs Supply Voltage
104
75
Charge Current vs Ambient
Temperature with Thermal
Regulation
Charge Current vs Battery Voltage
600
1100
1050
0
25
50
TEMPERATURE (°C)
4097 G12
IBAT (mA)
1150
–25
4097 G11
Charge Current vs Battery Voltage
1200
80
–50
5.50
4097 G15
Charge Current vs Battery Voltage
1200
VBAT = 3.7V
125
Charge Current vs Battery Voltage
600
THERMAL REGULATION
1000
500
800
400
100
RIUSB = 10k
IBAT (mA)
RIDC = 10k
IBAT (mA)
IBAT (mA)
102
600
300
200
400
98
VDCIN = 5V
RIDC = 1k
θJA = 60°C/W
200
96
4.25
4.50
4.75
5.00
VDCIN, VUSBIN (V)
5.25
5.50
4097 G16
0
2.0
2.5
3.0
3.5
VBAT (V)
VUSBIN = 5V
RIUSB = 2k
θJA = 60°C/W
100
4.0
4.5
4097 G17
0
2.0
2.5
3.0
3.5
VBAT (V)
4.0
4.5
4097 G18
4097f
5
LTC4097
TYPICAL PERFORMANCE CHARACTERISTICS
DCIN Power FET On-Resistance
vs Temperature
550
550
VDCIN = 4V
IBAT = 200mA
20
VUSBIN = 4V
IBAT = 200mA
VDCIN = 5V
IVNTC = 30mA
400
15
RVNTC (Ω)
RUSBON (mΩ)
500
450
450
400
350
–25
0
25
50
TEMPERATURE (°C)
75
300
–50
100
–25
0
25
50
TEMPERATURE (°C)
75
120
100
VDCIN = VUSBIN = 5V
VBAT = 4V
40
1
20
0
VCHRG (mV)
60
2
50
75
100
IVNTC (mA)
125
150
VDCIN = VUSBIN = 5.5V
60
VDCIN = VUSBIN = 4.25V
40
0
1
2
3
4
5
0
–50
6
–25
VCHRG (V)
4097 G22
0
25
50
TEMPERATURE (°C)
75
4097 G23
1000
950
950
900
900
100
4097 G24
SUSP Pin Pulldown Resistance vs
Temperature
HPWR Pin Threshold Voltage
(On-to-Off) vs Temperature
SUSP Pin Threshold Voltage
(On-to-Off) vs Temperature
VDCIN = VUSBIN = 5V
100
20
0
25
75
ICHRG = 5mA
80
80
ICHRG (mA)
4
0
0
25
50
TEMPERATURE (°C)
⎯C⎯H⎯R⎯G Pin Output Low Voltage vs
Temperature
100
VUSBIN = 5V
VDCIN = 5V
–25
4097 G21
⎯C⎯H⎯R⎯G Pin I-V Curve
6
3
0
–50
100
4097 G20
VVNTC vs IVNTC
5
VUSBIN = 5V
IVNTC = 30mA
5
4097 G19
VVNTC (V)
10
350
300
–50
1000
VNTC-DCIN and VNTC-USBIN
Power FET On-Resistance vs
Temperature
USBIN Power FET On-Resistance
vs Temperature
500
RDCON (mΩ)
NTC = 0V, HPWR = 5V, TA = 25°C,
unless otherwise noted.
4.5
VDCIN = 0V
VUSBIN = 5V
850
RSUSP (MΩ)
VHPWR (mV)
VSUSP (mV)
4.0
850
800
800
750
750
3.5
3.0
700
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G25
700
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G26
2.5
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G27
4097f
6
LTC4097
TYPICAL PERFORMANCE CHARACTERISTICS
NTC = 0V, HPWR = 5V, TA = 25°C,
unless otherwise noted.
Shutdown Supply Current vs
Temperature and VDCIN
HPWR Pin Pulldown Resistance
vs Temperature
4.5
60
SUSP = VDCIN
VUSBIN = VDCIN
50
40
IDCIN (µA)
RHPWR (MΩ)
4.0
3.5
30
VDCIN = 5.5V
20
VDCIN = 4.25V
3.0
10
2.5
–50
–25
0
25
50
TEMPERATURE (°C)
75
0
–50
100
–25
0
25
50
TEMPERATURE (°C)
75
4097 G28
4097 G29
Shutdown Supply Current vs
Temperature and VUSBIN
60
100
Undervoltage Lockout Voltage
(Falling) vs Temperature
4.10
SUSP = VUSBIN
VDCIN = 0V
4.05
50
DCIN UVLO
4.00
3.95
VUV (V)
IUSBIN (µA)
40
30
VUSBIN = 5.5V
3.85
20
0
–50
USBIN UVLO
3.80
VUSBIN = 4.25V
10
3.90
3.75
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G30
3.70
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4097 G31
4097f
7
LTC4097
PIN FUNCTIONS
DCIN (Pin 1): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
current is 1.2A. This pin should be bypassed with a 1µF
capacitor.
USBIN (Pin 2): USB Input Supply Pin. Provides power to
the battery charger. The maximum supply current is 1A.
This pin should be bypassed with a 1µF capacitor.
VNTC (Pin 3): Output Bias Voltage for NTC. A resistor
from this pin to the NTC pin sets up the bias for an NTC
thermistor. When the DCIN or USBIN pin voltage is sufficient
to begin charging (i.e. when the DCIN or USBIN supply
is greater than the undervoltage lockout thresholds and
at least 100mV or 150mV, respectively, above the battery
terminal), the VNTC pin is connected to the appropriate
input through an internal P-channel MOSFET. If sufficient
voltage to charge is not present on DCIN or USBIN the
VNTC pin is high impedance. This output can source up
to 120mA.
⎯ H
⎯ R
⎯ G
⎯ (Pin 4): Open-Drain Charge Status Output. When
C
⎯ H
⎯ R
⎯ G
⎯ pin is pulled low by an
the LTC4097 is charging, the C
internal N-channel MOSFET. When the charge cycle is com⎯ H
⎯ R
⎯ G
⎯ becomes high impedance. This output can
pleted, C
sink up to 10mA, making it suitable for driving a LED.
SUSP (Pin 5): Charge Enable Input. A logic low on this
pin enables the charger. If left floating, an internal 3.4MΩ
pull-down resistor defaults the LTC4097 to charge mode.
Pull this pin high for shutdown.
NTC (Pin 6): Input to the NTC (Negative Temperature
Coefficient) Thermistor Temperature Monitoring Circuit.
For normal operation, connect a thermistor from the NTC
pin to ground and a resistor of equal value from the NTC
pin to VNTC. When the voltage at this pin drops below
0.349 • VNTC at hot temperatures or rises above
0.765 • VNTC at cold, charging is suspended and the
⎯C⎯H⎯R⎯G pin output will keep the state in which it was before the event (low-Z or high-Z). Pulling this pin below
0.017 • VNTC disables the NTC feature. There is approximately 2°C of temperature hysteresis associated with each
of the input comparator’s thresholds.
HPWR (Pin 7): HPWR Enable Input. Used to control the
amount of current drawn from the USB port. A logic high
on the HPWR pin sets the charge current to 100% of the
current programmed by the IUSB pin. A logic low on the
HPWR pin sets the charge current to 20% of the current
programmed by the IUSB pin. An internal 3.4MΩ pull-down
resistor defaults the HPWR pin to its low current state.
ITERM (Pin 8): Charge Termination Current Threshold
Program. The termination current threshold, ITERMINATE, is
set by connecting a resistor, RITERM, to ground. ITERMINATE
is set by the following formula:
ITERMINATE =
100V
RITERM
When the battery current, IBAT, falls below the termination
threshold, charging stops and the ⎯C⎯H⎯R⎯G output becomes
high impedance.
4097f
8
LTC4097
PIN FUNCTIONS
IUSB (Pin 9): Charge Current Program for USB Power.
The charge current is set by connecting a resistor, RIUSB,
to ground. When charging in constant current mode, this
pin servos to 1V. The voltage on this pin can be used to
measure the battery current delivered from the USBIN
input using the following formula:
IBAT =
VIUSB
• 1000
RIUSB
IDC (Pin 10): Charge Current Program for Wall Adapter
Power. The charge current is set by connecting a resistor,
RIDC, to ground. When charging in constant current mode,
this pin servos to 1V. The voltage on this pin can be used
to measure the battery current delivered from the DCIN
input using the following formula:
IBAT =
VIDC
•1000
RIDC
GND (Pin 11): Ground.
BAT (Pin 12): Charger Output. This pin provides charge
current to the battery and regulates the final float voltage
to 4.2V.
Exposed Pad (Pin 13): Ground. The exposed backside
of the package is ground and must be soldered to the
PC board ground for electrical connection and maximum
heat transfer.
4097f
9
LTC4097
BLOCK DIAGRAM
DCIN
BAT
USBIN
1
12
2
VNTC
3
CC/CV
REGULATOR
R1
–
RNOM
TOO COLD
+
–
DCIN UVLO
6
RNTC
USBON
–
4.2V
+
NTC
DCON
+
+
R2
CC/CV
REGULATOR
–
TOO HOT
4V
USBIN UVLO
+
+
–
–
R3
BAT
+
BAT
NTC_EN
–
R4
CHRG
4
SUSPEND
10mA MAX
7 HPWR
+
4.1V
RHPWR
RECHARGE
LOGIC
–
RECHRG
BAT
TRICKLE
DC_ENABLE
–
TERM
USB_ENABLE
CHARGER CONTROL
+
SUSP
TRICKLE
CHARGE
2.9V
+
100mV
THERMAL
REGULATION
AND
SHUTDOWN
5
RSUSP
IBAT/1000
TERMINATION
IBAT/1000
+
–
–
TDIE
115°C
150°C
IBAT/1000
–
ITERM
8
IDC
10
RITERM
IUSB
9
RIDC
GND
11, 13
4097 BD
RIUSB
4097f
10
LTC4097
OPERATION
The LTC4097 is designed to efficiently manage charging
a single-cell lithium-ion battery from two separate power
sources: a wall adapter and USB power bus. Using the
constant-current/constant-voltage algorithm, the charger
can deliver up to 1.2A of charge current from the wall
adapter supply or up to 1A of charge current from the
USB supply with a final float voltage accuracy of ±0.6%.
The LTC4097 has two internal P-channel power MOSFETs,
thermal regulation and shut down circuitry. No blocking
diodes or external sense resistors are required.
Power Source Selection
The LTC4097 can charge a battery from either the wall
adapter input or the USB port input. The LTC4097 automatically senses the presence of voltage at each input. If both
power sources are present, the LTC4097 defaults to the
wall adapter source provided sufficient power is present
at the DCIN input. “Sufficient power” is defined as:
• Supply voltage is greater than the UVLO threshold.
• Supply voltage is greater than the battery voltage by
30mV (100mV or 150mV rising, 30mV falling).
The VNTC output pin indicates that sufficient input voltage
is available. Table 1 describes the behavior of the power
source selection.
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter supply is programmed using a single resistor from
the IDC pin to ground.
RIDC =
VUSBIN < 4V or
VUSBIN < BAT + 30mV
VDCIN > 4.2V and
VDCIN > BAT + 30mV
Charger powered from Charger powered from
wall adapter source;
wall adapter source
USBIN current < 25µA
VDCIN < 4.2V or
VDCIN < BAT + 30mV
Charger powered from No charging
USB source
ICHRG(DC)
, ICHRG(DC) =
1000 V
RIDC
Similarly, the charge current from the USB supply is
programmed using a single resistor from the IUSB pin
to ground. Setting HPWR pin to its high state will select
100% of the programmed charge current, while setting
HPWR to its low state will select 20% of the programmed
charge current.
RIUSB =
1000 V
ICHRG(USB)
(HPWR = HIGH)
ICHRG(USB) =
1000 V
(HPWR = HIGH)
RIUSB
ICHRG(USB) =
200 V
(HPWR = LOW)
RIUSB
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
applying the following equations:
Table 1. Power Source Selection
VUSBIN > 4V and
VUSBIN > BAT + 30mV
1000 V
IBAT =
VIDC
• 1000, (ch arg ing from wall adapter )
RIDC
IBAT =
VIUSB
• 1000,
RIUSB
(ch arg ing from USB sup ply, HPWR = HIGH)
IBAT =
VIUSB
• 200,
RIUSB
(ch arg ing from USB sup ply, HPWR = LOW)
4097f
11
LTC4097
OPERATION
Programming Charge Termination
The charge cycle terminates when the charge current
falls below the programmed termination threshold during
constant-voltage mode. This threshold is set by connecting an external resistor, RITERM, from the ITERM pin to
ground.
The charge termination current threshold (ITERMINATE) is
set by the following equation:
RITERM =
100V
ITERMINATE
, ITERMINATE =
100V
RITERM
The termination condition is detected by using an internal
filtered comparator to monitor the ITERM pin. When the
ITERM pin voltage drops below 100mV* for longer than
tTERMINATE (typically 3ms), the charge cycle terminates,
charge current latches off and the LTC4097 enters standby
mode. When charging, transient loads on the BAT pin can
cause the ITERM pin to fall below 100mV for short periods
of time before the DC charge current has dropped below
the programmed termination current. The 3ms filter time
(tTERMINATE) on the termination comparator ensures that
transient loads of this nature do not result in premature
charge cycle termination. Once the average charge current
drops below the programmed termination threshold, the
LTC4097 terminates the charge cycle and ceases to provide
any current out of the BAT pin. In this state, any load on
the BAT pin must be supplied by the battery.
Low-Battery Charge Conditioning (Trickle Charge)
This feature ensures that deeply discharged batteries are
gradually charged before applying full charge current. If
the BAT pin voltage is below 2.9V, the LTC4097 supplies
1/10th of the full charge current to the battery until the
BAT pin rises above 2.9V. For example, if the charger is
programmed to charge at 800mA from the wall adapter
input and 500mA from the USB input, the charge current
during trickle charge mode would be 80mA and 50mA,
respectively.
Automatic Recharge
In standby mode, the charger sits idle and monitors the
battery voltage using a comparator with a 1.6ms filter time
(tRECHRG). A charge cycle automatically restarts when the
battery voltage falls below 4.1V (which corresponds to
approximately 80%-90% battery capacity). This ensures
that the battery is kept at, or near, a fully charged condition and eliminates the need for periodic charge cycle
initiations. If the battery is removed from the charger, a
sawtooth waveform appears at the battery output. This
is caused by the repeated cycling between termination
and recharge events. This cycling results in pulsing at the
⎯C⎯H⎯R⎯G output; an LED connected to this pin will exhibit
a blinking pattern, indicating to the user that a battery is
not present. The frequency of the sawtooth is dependent
on the amount of output capacitance.
Status Indicators
⎯ H
⎯ R
⎯ G
⎯ ) has two states: pull-down
The charge status output (C
and high impedance. The pull-down state indicates that
the LTC4097 is in a charge cycle. Once the charge cycle
has terminated or the LTC4097 is disabled, the pin state
becomes high impedance. The pull-down state is capable
of sinking up to 10mA.
The power present output (VNTC) has two states: DCIN/
USBIN voltages and high impedance. The high impedance
state indicates that sufficient voltage is not present at either
DCIN or USBIN, therefore no charging will occur. The VNTC
output is capable of sourcing up to 120mA steady state
and includes short circuit protection.
*Any external sources that hold the ITERM pin above 100mV will prevent the LTC4097 from
terminating a charge cycle.
4097f
12
LTC4097
OPERATION
Manual Shutdown
The SUSP pin has a 3.4MΩ pulldown resistor to GND. A
logic low enables the charger and a logic high disables it
(the pulldown defaults the charger to the charging state).
The DCIN input draws 20µA when the charger is in shutdown. The USBIN input draws 20µA during shutdown if
no power is applied to DCIN, but draws only 10µA when
VDCIN > VUSBIN.
NTC Thermistor
The battery temperature is measured by placing a negative temperature coefficient (NTC) thermistor close to
the battery pack. The NTC circuitry is shown in the Block
Diagram of Figure 4. To use this feature, connect the NTC
thermistor, RNTC, between the NTC pin and ground and a
bias resistor, RNOM, from VNTC to NTC. RNOM should be
a 1% resistor with a value equal to the value of the chosen
NTC thermistor at 25°C (R25).
The LTC4097 will pause charging when the resistance of
the 100k NTC thermistor drops to 0.54 times the value of
R25 or approximately 54k (for a Vishay “Curve 1” thermistor, this corresponds to approximately 40°C). As the
temperature drops, the resistance of the NTC thermistor
rises. The LTC4097 is also designed to pause charging
when the value of the NTC thermistor increases to 3.25
times the value of R25. For a Vishay “Curve 1” thermistor
this resistance, 325k, corresponds to approximately 0°C.
The hot and cold comparators each have approximately
3°C of hysteresis to prevent oscillation about the trip point.
Grounding the NTC pin disables all NTC functionality.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise
above a preset value of approximately 115°C. This feature
protects the LTC4097 from excessive temperature and
allows the user to push the limits of the power handling
capability of a given circuit board without risk of damaging the device. The charge current can be set according
to typical (not worst case) ambient temperature with the
assurance that the charger will automatically reduce the
current in worst case conditions. A safety thermal shut
down circuit will turn off the charger if the die temperature
rises above a value of approximately 150°C. DFN power
considerations are discussed further in the Applications
Information section.
4097f
13
LTC4097
OPERATION
STARTUP
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
BAT < 2.9V
TRICKLE CHARGE
MODE
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
CHRG STATE: PULLDOWN
BAT > 2.9V
2.9V < BAT
BAT > 2.9V
CHARGE
MODE
CHARGE
MODE
FULL CURRENT
FULL CURRENT⇒HPWR = HIGH
1/5 FULL CURRENT⇒HPWR = LOW
CHRG STATE: PULLDOWN
CHRG STATE: PULLDOWN
SUSP
DRIVEN LOW
2.9V < BAT
IBAT < ITERMINATE
IN VOLTAGE MODE
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.1V
BAT < 2.9V
1/10th FULL CURRENT
STANDBY
MODE
STANDBY
MODE
NO CHARGE CURRENT
NO CHARGE CURRENT
CHRG STATE: Hi-Z
CHRG STATE: Hi-Z
SHUTDOWN
MODE
SUSP
DRIVEN HIGH
SUSP
DRIVEN HIGH
IDCIN DROPS TO 20µA
CHRG STATE: Hi-Z
SHUTDOWN
MODE
BAT < 4.1V
SUSP
DRIVEN LOW
IUSBIN DROPS TO 20µA
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
CHRG STATE: Hi-Z
4097 F01
Figure 1. LTC4097 State Diagram of a Charge Cycle
4097f
14
LTC4097
APPLICATIONS INFORMATION
Using a Single Charge Current Program Resistor
Power Dissipation
In applications where the programmed wall adapter charge
current and USB charge current are the same, a single
program resistor can be used to set both charge currents.
Figure 2 shows a charger circuit that uses one charge current program resistor. In this circuit, one resistor programs
the same charge current for each input supply.
When designing the battery charger circuit, it is not necessary to design for worst-case power dissipation scenarios
because the LTC4097 automatically reduces the charge
current during high power conditions. The conditions
that cause the LTC4097 to reduce charge current through
thermal feedback can be approximated by considering the
power dissipated in the IC. Most of the power dissipation
is generated from the internal MOSFET pass device. Thus,
the power dissipation is calculated to be:
ICHRG(DC) = ICHRG(USB) =
1000 V
RSET
The LTC4097 can also program the wall adapter charge
current and USB charge current independently using two
program resistors, RIDC and RIUSB. Figure 3 shows a
charger circuit that sets the wall adapter charge current
to 800mA and the USB charge current to 500mA.
Stability Considerations
The constant-voltage mode feedback loop is stable without
any compensation provided a battery is connected to the
charger output. However, a 4.7µF capacitor with a 1Ω series
resistor is recommended at the BAT pin to keep the ripple
voltage low when the battery is disconnected. When the
charger is in constant-current mode, the charge current
program pin (IDC or IUSB) is in the feedback loop, not the
battery. The constant-current mode stability is affected by
the impedance at the charge current program pin. With no
additional capacitance on this pin, the charger is stable
with program resistor values as high as 20KΩ (ICHRG =
50mA); however, additional capacitance on these nodes
reduces the maximum allowed program resistor.
LTC4097
WALL
ADAPTER
USB
PORT
BAT
DCIN
USBIN
1µF
1µF
RISET
2k
1%
100mA
(USB, HPWR = LOW)
500mA
HPWR
4.2V
1-CELL
Li-Ion
BATTERY
+
IUSB
IDC
ITERM
GND
PD = (VCC – VBAT) • IBAT
PD is the power dissipated, VCC is the input supply voltage (either DCIN or USBIN), VBAT is the battery voltage
and IBAT is the charge current. The approximate ambient
temperature at which the thermal feedback begins to
protect the IC is:
TA = 115°C – PD • θJA
TA = 115°C – (VCC – VBAT) • IBAT • θJA
Example: An LTC4097 operating from a 5V USB adapter
(on the USBIN input) is programmed to supply 500mA
full-scale current to a discharged Li-Ion battery with a
voltage of 3.3V. Assuming θJA is 60°C/W (see Thermal
Considerations), the ambient temperature at which the
LTC4097 will begin to reduce the charge current is approximately:
TA = 115°C – (5V – 3.3V) • (500mA) • 60°C/W
TA = 115°C – 0.85W • 60°C/W = 115°C – 51°C
TA = 64°C
WALL
ADAPTER
USB
PORT
DCIN
4097 F02
Figure 2. Dual Input Charger Circuit. The
Wall Adapter Charge Current and USB Charge
Current are Both Programmed to be 500mA
BAT
USBIN
1µF
1µF
VNTC
HPWR
RNTCBIAS
100k
1k
NTC
IUSB
RITERM
2k
1%
800mA (WALL)
100mA/500mA (USB)
LTC4097
RIUSB
2k
1%
RIDC
1.24k
1%
IDC
CHRG
ITERM
GND
+
RITERM
2k
1%
RNTC
100k
4.2V
1-CELL
Li-Ion
BATTERY
4097 F03
Figure 3. Full Featured Dual Input Charger Circuit
4097f
15
LTC4097
APPLICATIONS INFORMATION
The LTC4097 can be used above 64°C ambient, but the
charge current will be reduced from 500mA. The approximate current at a given ambient temperature can be
approximated by:
IBAT =
115°C – TA
( VIN – VBAT ) • θ JA
Using the previous example with an ambient temperature
of 75°C, the charge current will be reduced to approximately:
115°C – 75°C
40°C
=
(5V – 3.3V) • 60°C / W 102°C / A
IBAT = 392mA
IBAT =
It is important to remember that LTC4097 applications do
not need to be designed for worst-case thermal conditions,
since the IC will automatically reduce power dissipation
when the junction temperature reaches approximately
115°C. Moreover a thermal shut down protection circuit
around 150°C safely prevents any damage by forcing the
LTC4097 into shut down mode.
the upper and lower temperatures are pre-programmed
to approximately 40°C and 0°C, respectively (assuming
a Vishay “Curve 1” thermistor).
The upper and lower temperature thresholds can be adjusted by either a modification of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modified but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
adjustment resistor, both the upper and the lower temperature trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique are given below.
NTC thermistors have temperature characteristics which
are indicated on resistance-temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-N1003F, used
in the following examples, has a nominal value of 100k
and follows the Vishay “Curve 1” resistance-temperature
characteristic.
In the explanation below, the following notation is used.
Thermal Considerations
R25 = Value of the Thermistor at 25°C
In order to deliver maximum charge current under all
conditions, it is critical that the exposed metal pad on the
backside of the LTC4097 package is properly soldered
to the PC board ground. When correctly soldered to a
2500mm2 double sided 1oz copper board, the LTC4097
has a thermal resistance of approximately 60°C/W. Failure
to make thermal contact between the exposed pad on the
backside of the package and the copper board will result in
thermal resistances far greater than 60°C/W. As an example,
a correctly soldered LTC4097 can deliver over 500mA to
a battery from a 5V supply at room temperature. Without
a good backside thermal connection, this number would
drop to much less than 300mA.
RNTC|COLD = Value of thermistor at the cold trip point
Alternate NTC Thermistors and Biasing
The LTC4097 provides temperature qualified charging if
a grounded thermistor and a bias resistor are connected
to NTC. By using a bias resistor whose value is equal to
the room temperature resistance of the thermistor (R25)
RNTC|HOT = Value of the thermistor at the hot trip
point
rCOLD = Ratio of RNTC|COLD to R25
rHOT= Ratio of RNTC|HOT to R25
RNOM = Primary thermistor bias resistor (see Figure 4)
R1 = Optional temperature range adjustment resistor
(see Figure 5)
The trip points for the LTC4097’s temperature qualification
are internally programmed at 0.349 • VNTC for the hot
threshold and 0.765 • VNTC for the cold threshold.
Therefore, the hot trip point is set when:
RNTC|HOT
RNOM + RNTC|HOT
• VNTC = 0.349 • VNTC
4097f
16
LTC4097
APPLICATIONS INFORMATION
VNTC
RNOM
100k
NTC
VNTC
NTC BLOCK
3
0.765 • VNTC
NTC BLOCK
3
RNOM
105k
–
TOO_COLD
0.765 • VNTC
–
TOO_COLD
NTC
6
+
6
+
RNTC
100k
–
R1
12.7k
–
TOO_HOT
0.349 • VNTC
TOO_HOT
0.349 • VNTC
+
RNTC
100k
+
+
+
NTC_ENABLE
0.1V
NTC_ENABLE
–
0.1V
–
4097 F05
4097 F04
Figure 4. Typical NTC Thermistor Circuit
and the cold trip point is set when:
RNTC|COLD
RNOM + RNTC|COLD
• VNTC = 0.765 • VNTC
Solving these equations for RNTC|COLD and RNTC|HOT results
in the following:
RNTC|COLD = 0.536 • RNOM
and
RNTC|COLD = 3.25 • RNOM
By setting RNOM equal to R25, the above equations result
in rHOT = 0.536 and rCOLD = 3.25. Referencing these ratios
to the Vishay Resistance-Temperature Curve 1 chart gives
a hot trip point of about 40°C and a cold trip point of about
0°C. The difference between the hot and cold trip points
is approximately 40°C.
By using a bias resistor, RNOM, different in value from R25,
the hot and cold trip points can be moved in either direction. The temperature span will change somewhat due to
the non-linear behavior of the thermistor. The following
equations can be used to easily calculate a new value for
the bias resistor:
RNOM =
rHOT
• R25
0.536
RNOM =
rCOLD
• R25
3.25
Figure 5. NTC Thermistor Circuit with Additional Bias Resistor
where rHOT and rCOLD are the resistance ratios at the
desired hot and cold trip points. Note that these equations
are linked. Therefore, only one of the two trip points can
be chosen, the other is determined by the default ratios
designed in the IC. Consider an example where a 60°C
hot trip point is desired.
From the Vishay Curve 1 R-T characteristics, rHOT is 0.2488
at 60°C. Using the above equation, RNOM should be set
to 46.4k. With this value of RNOM, the cold trip point is
about 16°C. Notice that the span is now 44°C rather than
the previous 40°C. This is due to the decrease in “temperature gain” of the thermistor as absolute temperature
increases.
The upper and lower temperature trip points can be independently programmed by using an additional bias resistor
as shown in Figure 5. The following formulas can be used
to compute the values of RNOM and R1:
RNOM =
rCOLD – rHOT
• R25
2.714
R1 = 0.536 • RNOM – rHOT • R25
For example, to set the trip points to 0°C and 45°C with
a Vishay Curve 1 thermistor choose
RNOM =
3.266 – 0.4368
• 100k = 104.2k
2.714
4097f
17
LTC4097
APPLICATIONS INFORMATION
the nearest 1% value is 105k.
R1 = 0.536 • 105k – 0.4368 • 100k = 12.6k
the nearest 1% value is 12.7k. The final solution is shown
in Figure 5 and results in an upper trip point of 45°C and
a lower trip point of 0°C.
Protecting the USB Pin and Wall Adapter Input from
Overvoltage Transients
Caution must be exercised when using ceramic capacitors to bypass the USBIN or the wall adapter inputs. High
voltage transients can be generated when the USB or wall
adapter is hot plugged. When power is supplied via the
USB bus or wall adapter, the cable inductance along with
the self resonant and high Q characteristics of ceramic
capacitors can cause substantial ringing which could
exceed the maximum voltage ratings and damage the
LTC4097. Refer to Linear Technology Application Note 88,
entitled “Ceramic Input Capacitors Can Cause Overvoltage
Transients” for a detailed discussion of this problem.
Always use an oscilloscope to check the voltage waveforms at the USBIN and DCIN pins during USB and wall
adapter hot-plug events to ensure that overvoltage
transients have been adequately removed.
Reverse Polarity Input Voltage Protection
In some applications, protection from reverse polarity
voltage on the input supply pins is desired. If the supply voltage is high enough, a series blocking diode can
be used. In other cases where the voltage drop must be
kept low, a P-channel MOSFET can be used (as shown in
Figure 6).
DRAIN-BULK
DIODE OF FET
WALL
ADAPTER
LTC4097
DCIN
4097 F06
Figure 6. Low Loss Input Reverse Polarity Protection
4097f
18
LTC4097
PACKAGE DESCRIPTION
DDB Package
12-Lead Plastic DFN (3mm × 2mm)
(Reference LTC DWG # 05-08-1723 Rev Ø)
0.64 ±0.05
(2 SIDES)
3.00 ±0.10
(2 SIDES)
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.45 BSC
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
R = 0.115
TYP
7
R = 0.05
TYP
2.00 ±0.10
(2 SIDES)
0.75 ±0.05
0.64 ± 0.10
(2 SIDES)
6
0.23 ± 0.05
0 – 0.05
PIN 1
R = 0.20 OR
0.25 × 45°
CHAMFER
1
(DDB12) DFN 0106 REV Ø
0.45 BSC
2.39 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
0.40 ± 0.10
12
2.39 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
4097f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LTC4097
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3455
Dual DC/DC Converter with USB Power
Management and Li-Ion Battery Charger
Efficiency >96%, Accurate USB Current Limiting (500mA/100mA),
4mm × 4mm QFN-24 Package
LTC4053
USB Compatible Monolithic Li-Ion Battery Charger
Standalone Charger with Programmable Timer, Up to 1.25A Charge Current
LTC4054/LTC4054X
Standalone Linear Li-Ion Battery Charger
with Integrated Pass Transistor in ThinSOTTM
Thermal Regulation Prevents Overheating, C/10 Termination,
C/10 Indicator, Up to 800mA Charge Current
LTC4055
USB Power Controller and Battery Charger
Charges Single-Cell Li-Ion Batteries Directly from USB Port,
Thermal Regulation, 4mm × 4mm QFN-16 Package
LTC4058/LTC4058X
Standalone 950mA Lithium-Ion Charger in DFN
C/10 Charge Termination, Battery Kelvin Sensing, ±7% Charge Accuracy
LTC4061
Standalone Li-Ion Charger with Thermistor Interface 4.2V, ±0.35% Float Voltage, Up to 1A Charge Current,
3mm × 3mm DFN-10 Package
LTC4061-4.4
Standalone Li-Ion Charger with Thermistor Interface 4.4V, ±0.4% Float Voltage, Up to 1A Charge Current,
3mm × 3mm DFN-10 Package
LTC4062
Standalone Li-Ion Charger with Micropower
Comparator
4.2V, ±0.35% Float Voltage, Up to 1A Charge Current,
3mm × 3mm DFN-10 Package
LTC4065/LTC4065A
Standalone 750mA Li-Ion Charger
in 2mm × 2mm DFN
4.2V, ±0.6% Float Voltage, Up to 750mA Charge Current,
2mm × 2mm DFN-6 Package
LTC4066
USB Power Controller and Li-Ion Linear Battery
Charger with Low-Loss Ideal Diode
Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and
Wall Adapter, Low-Loss (50Ω) Ideal Diode, 4mm × 4mm QFN-24 Package
LTC4068/LTC4068X
Standalone Linear Li-Ion Battery Charger with
Programmable Termination
Charge Current up to 950mA, Thermal Regulation,
3mm × 3mm DFN-8 Package
LTC4069
Standalone Li-Ion Battery Charger with NTC
Thermistor Input in 2mm × 2mm DFN
4.2V, ±0.6% Float Voltage, Up to 750mA Charge Current, Timer Termination +
C/10 Detection Output
LTC4075
Dual Input Standalone Li-Ion Battery Charger
Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs with
Automatic Input Power Detection and Selection, 950mA Charger Current,
Thermal Regulation, C/X Charge Termination, 3mm × 3mm DFN Package
LTC4076
Dual Input Standalone Li-Ion Battery Charger
Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs with
Automatic Input Power Detection and Selection, 950mA Charger Current,
Thermal Regulation, C/X Charge Termination, 3mm × 3mm DFN Package
LTC4077
Dual Input Standalone Li-Ion Battery Charger
Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs with
Automatic Input Power Detection and Selection, 950mA Charger Current,
Thermal Regulation, C/10 Charge Termination, 3mm × 3mm DFN Package
LTC4085
USB Power Manager with Ideal Diode Controller
and Li-Ion Charger
Charges Single-Cell Li-Ion Batteries Directly from a USB Port, Thermal
Regulation, 200mΩ Ideal Diode with <50mΩ option, 4mm × 3mm
DFN-14 Package
LTC4089/LTC4089-5 USB Power Manager with Ideal Diode Controller
and High Efficiency Li-Ion Battery Charger
High Efficiency 1.2A Charger from 6V to 36V (40V Max) Input, Bat-Track™
Adaptive Output Control (LTC4089), Fixed 5V Output (LTC4089-5), Charges
Single-Cell Li-Ion Batteries Directly from USB Port, Thermal Regulation,
200mΩ Ideal Diode with <50mΩ option, 4mm × 3mm DFN-14 Package
LTC4096/LTC4096X
Dual Input Standalone Li-Ion Battery Charger
Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs
with Automatic Input Power Detection and Selection, 1.2A Charger Current,
Thermal Regulation, C/X Charge Termination, Input Power Present Output
(PWR) with 120mA Drive Capability, 3mm × 3mm DFN Package
LTC4410
USB Power Manager and Battery Charger
Manages Total Power Between a USB Peripheral and Battery Charger,
Ultralow Battery Drain: 1µA, ThinSOT Package
LTC4411/LTC4412
Low Loss PowerPathTM Controller in ThinSOT
Automatic Switching Between DC Sources,
Load Sharing, Replaces ORing Diodes
ThinSOT and PowerPath are trademarks of Linear Technology Corporation
4097f
20 Linear Technology Corporation
LT 0207 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007