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Linear Technology Electronic Components Datasheet

LTC4001-1 Datasheet

2A Synchronous Buck Li-Ion Charger

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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
VINSENSE
PVIN
SW
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
1


Linear Technology Electronic Components Datasheet

LTC4001-1 Datasheet

2A Synchronous Buck Li-Ion Charger

No Preview Available !

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
2


Part Number LTC4001-1
Description 2A Synchronous Buck Li-Ion Charger
Maker Linear Technology
Total Page 20 Pages
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