Battery Charger. LTC3559 Datasheet

LTC3559 Charger. Datasheet pdf. Equivalent

Part LTC3559
Description Linear USB Battery Charger
Feature www.DataSheet4U.com FEATURES Battery Charger ■ Standalone USB Charger ■ Up to 950mA Charge Current .
Manufacture Linear Technology
Datasheet
Download LTC3559 Datasheet



LTC3559
www.DataSheet4U.com
FEATURES
Battery Charger
Standalone USB Charger
Up to 950mA Charge Current Programmable via
Single Resistor
HPWR Input Selects 20% or 100% of Programmed
Charge Current
NTC Input for Temperature Qualified Charging
Internal Timer Termination
Bad Battery Detection
CHRG indicates C/10 or Timeout
Buck Regulators
400mA Output Current
2.25MHz Constant Frequency Operation
Zero Current in Shutdown
Low Noise Pulse Skip Operation or Power Saving
Burst Mode Operation
Low No Load Quiescent Current: 35μA
Available in a Low Profile Thermally Enhanced
16-Lead 3mm × 3mm QFN Package
APPLICATIONS
SD/Flash-Based MP3 Players
Low Power Handheld Applications
LTC3559
Linear USB Battery Charger
with Dual Buck Regulators
DESCRIPTION
The LTC®3559 is a USB battery charger with dual high ef-
ficiency buck regulators. The part is ideally suited to power
single cell Li-Ion/Polymer based handheld applications
needing multiple supply rails.
Battery charge current is programmed via the PROG pin
and the HPWR pin, with capability up to 950mA at the BAT
pin. The battery charger has an NTC input for temperature
qualified charging. The CHRG pin allows battery status to
be monitored continuously during the charging process.
An internal timer controls charger termination.
Each monolithic synchronous buck regulator provides up
to 400mA of output current while operating at efficiencies
greater than 90% over the entire Li-Ion/Polymer range.
A MODE pin provides the flexibility to place both buck
regulators in a power saving Burst Mode operation or a
low noise pulse skip mode.
The LTC3559 is offered in a low profile thermally enhanced
16-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 Dual Buck Regulators
USB (4.3V TO 5.5V)
OR AC ADAPTOR
DIGITAL
CONTROL
1μF
1.74k
VCC
NTC
PROG
LTC3559
CHRG
SUSP
UP TO 500mA
BAT +
PVIN
2.2μF
SINGLE
Li-lon CELL
(2.7V TO 4.2V)
4.7μH
SW1
22pF
FB1
655k
309k
2.5V
400mA
10μF
HPWR
EN1
EN2
MODE
GND
SW2
FB2
EXPOSED
PAD
4.7μH
22pF
324k
649k
3559 TA01
1.2V
400mA
10μF
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LTC3559
www.DataSheet4U.com
LTC3559
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC (Transient);
t< 1ms and duty cycle< 1%.......................... –0.3V to 7V
VCC (Static) .................................................. –0.3V to 6V
BAT, CHRG, SUSP ........................................ –0.3V to 6V
HPWR, NTC, PROG....... –0.3V to Max (VCC, BAT) + 0.3V
PROG Pin current................................................1.25mA
BAT Pin Current ..........................................................1A
PVIN ................................................ –0.3V to BAT + 0.3V
EN1, EN2, MODE.......................................... –0.3V to 6V
FB1, FB2, SW1, SW2 ............–0.3V to PVIN + 0.3V or 6V
ISW1, ISW2 ...................................................... 600mA DC
Junction Temperature (Note 2) ............................. 125°C
Operating Temperature Range (Note 3) ... –40°C to 85°C
Storage Temperature.............................. –65°C to 125°C
PACKAGE/ORDER INFORMATION
TOP VIEW
16 15 14 13
GND 1
12 HPWR
BAT 2
11 SUSP
17
MODE 3
10 FB2
FB1 4
9 EN2
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER UD PART MARKING
LTC3559EUD
LCMB
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 specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery Charger. VCC = 5V, BAT = PVIN = 3.6V, RPROG = 1.74k, HPWR = 5V, SUSP = NTC = EN1 = EN2 = 0V
VCC Input Supply Voltage
IVCC
VFLOAT
ICHG
Battery Charger Quiescent Current (Note 4) Standby Mode, Charge Terminated
Suspend Mode, VSUSP = 5V
BAT Regulated Output Voltage
0°C ≤ TA ≤ 85°C
Constant Current Mode Charge Current HPWR = 5V
HPWR = 0V
IBAT Battery Drain Current
Standby Mode, Charger Terminated
Shutdown, VCC < VUVLO, BAT = 4.2V
Suspend Mode, SUSP = 5V, BAT = 4.2V
VUVLO
Undervoltage Lockout Threshold
BAT = 3.5V, VCC Rising
ΔVUVLO Undervotlage Lockout Hystersis
BAT = 3.5V
VDUVLO
Differential Undervoltage Lockout
Threshold
BAT = 4.2V, (VCC – BAT) Falling
ΔVDUVLO Differential Undervoltage Lockout
Hysteresis
BAT = 4.2V
VPROG
hPROG
PROG Pin Servo Voltage
Ratio of IBAT to PROG Pin Current
HPWR = 5V
HPWR = 0V
BAT < VTRKL
ITRKL
Trickle Charge Current
BAT < VTRKL
VTRKL
Trickle Charge Threshold Voltage
BAT Rising
4.3
5.5
200 400
8.5 17
4.179 4.200 4.221
4.165 4.200 4.235
440 460 500
84 92 100
–3.5 –7
–2.5 –4
–1.5 –3
3.85 4.0 4.125
200
30 50 70
V
μA
μA
V
V
mA
mA
μA
μA
μA
V
mV
mV
130 mV
1.000
0.200
0.100
800
V
V
V
mA/mA
36 46 56
mA
2.8 2.9 3.0
V
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