Charger. LTC4001EUF-1 Datasheet

LTC4001EUF-1 Datasheet PDF

Part LTC4001EUF-1
Description 2A Synchronous Buck Li-Ion Charger
Feature LTC4001EUF-1; FEATURES n Low Power Dissipation n 2A Maximum Charge Current n No External MOSFETs, Sense Resistor o.
Manufacture Linear
Datasheet
Download LTC4001EUF-1 Datasheet




LTC4001EUF-1
FEATURES
n Low Power Dissipation
n 2A Maximum Charge Current
n No External MOSFETs, Sense Resistor or
Blocking Diode Required
n Remote Sensing at Battery Terminals
n Programmable Charge Termination Timer
n Preset 4.1V Float Voltage with ±0.5% Accuracy
wwwn.Da4t.a1SVheFelot4aUt.cVoomltage Improves Battery Life and High
Temperature Safety Margin
n Programmable Charge Current Detection/
Termination
n Automatic Recharge
n Thermistor Input for Temperature Qualified
Charging
n Compatible with Current Limited Wall Adapters
n Low Profile 16-Lead (4mm × 4mm) QFN Package
APPLICATIONS
n Handheld Battery-Powered Devices
n Handheld Computers
n Charging Docks and Cradles
n Digital Cameras
n Smart Phones
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC4001-1
2A Synchronous
Buck Li-Ion Charger
DESCRIPTION
The LTC®4001-1 is a 2A Li-Ion battery charger intended for
5V wall adapters. It utilizes a 1.5MHz synchronous buck
converter topology to reduce power dissipation during
charging. Low power dissipation, an internal MOSFET and
sense resistor allow a physically small charger that can be
embedded in a wide range of handheld applications. The
LTC4001-1 includes complete charge termination circuitry,
automatic recharge and a ±1% 4.1V float voltage. Input
short-circuit protection is included so no blocking diode
is required.
This 4.1V version of the standard LTC4001 is intended
for applications which will be operated or stored above
approximately 60°C. Under these conditions, the reduced
float voltage will trade-off initial cell capacity for the benefit
of increased capacity retention over the life of the battery. A
reduced float voltage also minimizes swelling in prismatic
and polymer cells, and avoids open CID (pressure fuse)
in cylindrical cells.
Battery charge current, charge timeout and end-of-charge
indication parameters are set with external components.
Additional features include shorted cell detection, tempera-
ture qualified charging and overvoltage protection. The
LTC4001-1 is available in a low profile (0.75mm) 16-lead
(4mm × 4mm) QFN package.
TYPICAL APPLICATION
2A Single Cell Li-Ion Battery Charger
1.5μH
VIN
4.5V TO 5.5V
10μF
SW
VINSENSE
PVIN
SENSE
BATSENS
BAT
PGND
CHRG
LTC4001-1
NTC
FAULT
EN
PROG IDET TIMER
SS GNDSENS
274Ω
0.22μF
0.1μF
10μF + 4.1V
Li-Ion
40011 TA01a
Power Loss vs VBAT
Charging (PWM Mode)
1.25
1.00
0.75
0.50
0.25
VIN = 5V
2A CHARGER
0
3
3.25 3.5 3.75
VBAT (V)
4
4.25
40011 TA01b
40011fa
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LTC4001EUF-1
LTC4001-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PVIN, VINSENSE
t < 1ms, DC < 1% .................................... –0.3V to 7V
Steady State............................................. –0.3V to 6V
SW, SENSE, BAT, BATSENS, SS, FAULT, CHRG, EN, NTC,
PROG, IDET, TIMER Voltage........................ – 0.3V to 6V
Operating Temperature Range (Note 3) .. –40°C to 85°C
Operating Junction Temperature
(Note 5) ................................................ –40°C to 125°C
Storage Temperature Range.................. –65°C to 125°C
www.DataSheet4U.com
PIN CONFIGURATION
TOP VIEW
16 15 14 13
BAT 1
12 PROG
SENSE 2
11 NTC
17
PGND 3
10 FAULT
GNDSENS 4
9 VINSENSE
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4001EUF-1#PBF
LTC4001EUF-1#TRPBF 40011
16-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VEN = 0V, RPROG = 549Ω, RIDET = 549Ω, unless otherwise
specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN
Supply Voltage
IIN
VFLOAT VBAT Regulated Float Voltage
(Note 2)
PVIN Connected to VINSENSE, PROG and IDET
Pins Open, Charger On
Shutdown, EN = VIN
Measured from BATSENS to GNDSENS
4
5.5
V
2
mA
50
μA
4.059
4.1
4.141
V
4.079
4.1
4.121
V
IBAT
ITRIKL
VTRIKL
VUVL
ΔVUVL
Current Mode Charge Current
Trickle Charge Current
Trickle Charge Threshold
VIN Undervoltage Lockout Voltage
VIN Undervoltage Lockout
Hysteresis
RPROG = 549Ω, VBAT = 3.5V
SRhPuROtdGo=wn1,.1E0Nk,=VVBIANT = 3.5V
VBAT = 2V
VBAT Rising
VBAT Falling
VIN Rising, Measured from VINSENSE to GNDSENS
Measured from VINSENSE to GNDSENS
1.8
2
2.2
A
0.9
1
1.1
A
±5
μA
35
50
65
mA
3.05
3.1
3.20
V
2.85
3.0
3.05
V
2.7
2.82
V
100
mV
VASD
Automatic Shutdown Threshold VINSENSE – VBATSENS Rising (Turn-On), VBATSENSE = 4V
200
250
300
mV
Voltage
VINSENSE – VBATSENS Falling (Turn-Off), VBATSENSE = 4V
15
30
60
mV
40011fa
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LTC4001EUF-1
LTC4001-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VEN = 0V, RPROG = 549Ω, RIDET = 549Ω, unless otherwise
specified.
SYMBOL PARAMETER
fOSC
Oscillator Frequency
D
Maximum Duty Factor
RPFET
RNFET
tTIMER
VEN
RDS(ON) of P-Channel MOSFET
RDS(ON) of N-Channel MOSFET
Timer Accuracy
Enable Input Threshold Voltage
ΔVEN Enable Input Hysteresis
wwwV.PDRaOGtaShePeRtO4UG.cPionmVoltage
VIDET IDET Pin Voltage
IIDET
ICHRG
IDET Threshold
CHRG Pin Weak Pull-Down
Current
VCHRG CHRG Pin Output Low Voltage
VOL
VOH
VRECHRG
FAULT Pin Output Low Voltage
FAULT Pin Output High Voltage
Recharge Battery Threshold
Voltage
tRB
tRECHRG
tTRIKL
Recharge Filter Time Constant
Recharge Time
Low-Battery Trickle Charge Time
ISS
Soft-Start Ramp Current
VCOLD NTC Pin Cold Temperature Fault
Threshold
VHOT NTC Pin Hot Temperature Fault
Threshold
VDIS
NTC Disable Threshold (Falling)
CONDITIONS
Measured from PVIN to SW
Measured from SW to PGND
CTIMER = 0.22μF
VEN Rising
RPROG = 549Ω
RIDET = 549Ω
RIDET = 549Ω
VCHRG = 1V
ICHRG = 5mA
1mA Load
1mA Load
VFLOAT – VRECHRG VBAT Falling
Percent of Total Charge Time
Percent of Total Charge Time, VBAT < 2.8V,
Measured Using BATSENS and GNDSENS Pins
VBAT < VFLOAT – 100mV, VBAT Across BATSENS
and GNDSENS Pins
From NTC to GNDSENS Pin
Rising Threshold
Falling Threshold
From NTC to GNDSENS Pin
Falling Threshold
Rising Threshold
From NTC to GNDSENS Pin
ΔVDIS NTC Disable Hysteresis
From NTC to GNDSENS Pin
MIN
TYP
MAX UNITS
1.3
1.5
1.7
MHz
100
%
127
121
±10
%
0.6
0.8
1
V
100
mV
1.213
V
1.213
V
150
200
250
mA
15
30
50
μA
0.2
0.4
V
0.4
V
4.6
V
50
100
135
mV
4
ms
50
%
25
%
6
12.8
16
μA
0.74 VINSENSE
V
0.72 VINSENSE
V
0.29 VINSENSE
V
0.30 VINSENSE
V
0.015 •
0.02 •
0.025 •
V
VINSENSE VINSENSE VINSENSE
0.01 •
V
VINSENSE
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: Operation with current limited wall adapters is allowed down to the
undervoltage lockout threshold.
Note 3: The LTC4001E-1 is guaranteed to meet performance specifica-
tions 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 4: TJ is calculated from the ambient temperature TA and power dis-
sipation PD according to the following formula:
TJ = TA + (PD • 37°C/W)
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload. Junction temperature will
exceed 125°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
my impair device reliability.
40011fa
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