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Linear Technology Electronic Components Datasheet

LTC3558 Datasheet

Linear USB Battery Charger

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LTC3558 pdf
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FEATURES
Battery Charger
n Standalone USB Charger
n Up to 950mA Charge Current Programmable via
Single Resistor
n HPWR Input Selects 20% or 100% of Programmed
Charge Current
n NTC Input for Temperature Qualified Charging
n Internal Timer Termination
n Bad Battery Detection
Switching Regulators (Buck and Buck-Boost)
n Up to 400mA Output Current per Regulator
n 2.25MHz Constant-Frequency Operation
n Power Saving Burst Mode® Operation
n Low Profile, 20-Lead, 3mm × 3mm QFN Package
APPLICATIONS
n SD/Flash-Based MP3 Players
n Low Power Handheld Applications
LTC3558
Linear USB Battery Charger
with Buck and
Buck-Boost Regulators
DESCRIPTION
The LTC®3558 is a USB battery charger with dual high ef-
ficiency switching regulators. The device is ideally suited
to power single-cell Li-Ion/Polymer based handheld ap-
plications needing multiple supply rails.
Battery charge current is programmed via the PROG pin
and the HPWR pin with capability up to 950mA of current
at the BAT pin. The CHRG pin allows battery status to be
monitored continuously during the charging process. An
internal timer controls charger termination.
The part includes monolithic synchronous buck and buck-
boost regulators that can provide up to 400mA of output
current each and operate at efficiencies greater than 90%
over the entire Li-Ion/Polymer battery range. The buck-
boost regulator can regulate its programmed output voltage
at its rated deliverable current over the entire Li-Ion range
without drop out, increasing battery runtime.
The LTC3558 is offered in a low profile (0.75mm), thermally
enhanced, 20-lead (3mm × 3mm) QFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
USB Charger Plus Buck Regulator and Buck-Boost Regulator
USB (4.3V TO 5.5V)
1μF
VCC
1.74k
PROG
BAT
PVIN1
PVIN2
NTC
SW1
LTC3558
CHRG
SUSP
FB1
SWAB2
DIGITAL
CONTROL
HPWR
MODE
SWCD2
VOUT2
EN1
10μF
4.7μH
2.2μH
324k
EN2 FB2
105k
EXPOSED
GND PAD
VC2
3558 TA01
+ SINGLE
Li-lon CELL
(2.7V TO 4.2V)
1.2V AT 400mA
324k 10pF 10μF
649k
3.3V AT 400mA
121k
33pF
15k
330pF
22μF
10pF
Demo Board
3558f
1


Linear Technology Electronic Components Datasheet

LTC3558 Datasheet

Linear USB Battery Charger

No Preview Available !

LTC3558 pdf
LTC3558
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC (Transient);
wwwt.d<ata1smheseta4nu.dcoDmuty Cycle < 1%....................... –0.3V to 7V
VCC (Static) .................................................. –0.3V to 6V
BAT, CHRG ................................................... –0.3V to 6V
PROG, SUSP.................................–0.3V to (VCC + 0.3V)
HPWR, NTC................... –0.3V to Max (VCC, BAT) + 0.3V
PROG Pin Current ...............................................1.25mA
BAT Pin Current ..........................................................1A
PVIN1, PVIN2 ..................................–0.3V to (BAT + 0.3V)
EN1, EN2, MODE, VOUT2 .............................. –0.3V to 6V
FB1, SW1 ......................... –0.3V to (PVIN1 + 0.3V) or 6V
FB2, VC2, SWAB2 ............. –0.3V to (PVIN2 + 0.3V) or 6V
SWCD2 ............................–0.3V to (VOUT2 + 0.3V) or 6V
ISW1 ...............................................................600mA DC
ISWAB2, ISWCD2, IVOUT2 ................................... 750mA DC
Junction Temperature (Note 2) ............................. 125°C
Operating Temperature Range (Note 3).... –40°C to 85°C
Storage Temperature.............................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
20 19 18 17 16
GND 1
15 EN2
BAT 2
14 VC2
MODE 3
21 13 FB2
FB1 4
12 SUSP
EN1 5
11 VOUT2
6 7 8 9 10
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3558EUD#PBF
LTC3558EUD#TRPBF
LDCD
20-Lead (3mm × 3mm) 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
3558f
2


Part Number LTC3558
Description Linear USB Battery Charger
Maker Linear Technology
Total Page 30 Pages
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