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PDF LTC3558 Data sheet ( Hoja de datos )
| Número de pieza | LTC3558 | |
| Descripción | Linear USB Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
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1
1 page  
LTC3558
ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VCC = 5V, BAT = PVIN1 = PVIN2 = 3.6V, RPROG = 1.74k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RDSP(ON)
PMOS RDS(ON)
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RDSN(ON)
NMOS RDS(ON)
VOUT = 3.6V
0.6 Ω
0.6 Ω
ILEAK(P)
PMOS Switch Leakage
Switches A, D
–1 1 μA
ILEAK(N)
NMOS Switch Leakage
Switches B, C
–1 1 μA
DCBUCK(MAX) Maximum Buck Duty Cycle
MODE = 0
l 100
%
DCBOOST(MAX) Maximum Boost Duty Cycle
MODE = 0
75 %
tSS2 Soft-Start Time
0.5 ms
ROUT(PD)
VOUT Pull-Down in Shutdown
10 kΩ
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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA)
Note 3: The LTC3558E is guaranteed to meet 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 4: VCC supply current does not include current through the PROG pin
or any current delivered to the BAT pin. Total input current is equal to this
specification plus 1.00125 • IBAT where IBAT is the charge current.
Note 5: IC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
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5 Page 
LTC3558
PIN FUNCTIONS
GND (Pin 1): Ground. Connect to Exposed Pad (Pin 21).
BAT (Pin 2): Charge Current Output. Provides charge cur-
wwwr.deantat stoheteht4eub.caotmtery and regulates final float voltage to 4.2V.
MODE (Pin 3): MODE Pin for Switching Regulators. When
held high, both regulators operate in Burst Mode Opera-
tion. When held low, the buck regulator operates in pulse
skip mode and the buck-boost regulator operates in PWM
mode. This pin is a high impedance input; do not float.
FB1 (Pin 4): Buck Regulator Feedback Voltage Pin. Re-
ceives feedback by a resistor divider connected across
the output.
EN1 (Pin 5): Enable Input Pin for the Buck Regulator. This
pin is a high impedance input; do not float. Active high.
SW1 (Pin 6): Buck Regulator Switching Node. External
inductor connects to this node.
PVIN1 (Pin 7): Input Supply Pin for Buck Regulator. Con-
nect to BAT and PVIN2. A single 10μF input decoupling
capacitor to GND is required.
PVIN2 (Pin 8): Input Supply Pin for Buck-Boost Regulator.
Connect to BAT and PVIN1. A single 10μF input decoupling
capacitor to GND is required.
SWAB2 (Pin 9): Switch Node for Buck-Boost Regulator
Connected to the Internal Power Switches A and B. External
inductor connects between this node and SWCD2.
SWCD2 (Pin 10): Switch Node for Buck-Boost Regulator
Connected to the Internal Power Switches C and D. External
inductor connects between this node and SWAB2.
VOUT2 (Pin 11): Regulated Output Voltage for Buck-Boost
Regulator.
SUSP (Pin 12): Suspend Battery Charging Operation. A
voltage greater than 1.2V on this pin puts the battery char-
ger in suspend mode, disables the charger and resets the
termination timer. A weak pull-down current is internally
applied to this pin to ensure it is low at power-up when
the input is not being driven externally.
FB2 (Pin 13): Buck-Boost Regulator Feedback Voltage
Pin. Receives feedback by a resistor divider connected
across the output.
VC2 (Pin 14): Output of the Error Amplifier and Voltage
Compensation Node for the Buck-Boost Regulator. Ex-
ternal Type I or Type III compensation (to FB2) connects
to this pin.
EN2 (Pin 15): Enable Input Pin for the Buck-Boost Regu-
lator. This pin is a high impedance input; do not float.
Active high.
HPWR (Pin 16): High Current Battery Charging Enabled.
A voltage greater than 1.2V at this pin programs the
BAT pin current at 100% of the maximum programmed
charge current. A voltage less than 0.4V sets the BAT pin
current to 20% of the maximum programmed charge
current. When used with a 1.74k PROG resistor, this pin
can toggle between low power and high power modes per
USB specification. A weak pull-down current is internally
applied to this pin to ensure it is low at power-up when
the input is not being driven externally.
NTC (Pin 17): Input to the NTC Thermistor Monitoring
Circuit. The NTC pin connects to a negative temperature
coefficient thermistor which is typically co-packaged with
the battery pack to determine if the battery is too hot or too
cold to charge. If the battery temperature is out of range,
charging is paused until the battery temperature re-enters
the valid range. A low drift bias resistor is required from
VCC to NTC and a thermistor is required from NTC to
ground. To disable the NTC function, the NTC pin should
be tied to ground.
PROG (Pin 18): Charge Current Program and Charge
Current Monitor Pin. Charge current is programmed by
connecting a resistor from PROG to ground. When charg-
ing in constant-current mode, the PROG pin servos to 1V
if the HPWR pin is pulled high, or 200mV if the HPWR pin
is pulled low. The voltage on this pin always represents
the BAT pin current through the following formula:
IBAT
=
PROG • 800
RPROG
CHRG (Pin 19): Open-Drain Charge Status Output. The
CHRG pin indicates the status of the battery charger. Four
possible states are represented by CHRG charging, not
charging (i.e., the charge current is less than one-tenth
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3558.PDF ] | |
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