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PT1505 Datasheet Preview

PT1505 Datasheet

White LED Driver & PMU

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GENERAL DESCRIPTION
The PT1505 is an integrated power management unit
and white LED driver for small handheld portable
applications. It contains a single-cell Lithium Ion
battery charger, a synchronous step-down DC-DC
converter, 2 Low Dropout Regulators and a step-up
DC-DC converter designed for driving up to 8 white
LEDs in series. It allows charging from both wall
adapter and USB port. When charging from wall
adapter, the PT1505 increases the charging current
automatically.
The battery charger is a highly integrated charging
management device targeted at space limited portable
applications. It offers an integrated MOSFET and
current sensor, reverse blocking protection, high
accuracy current and voltage regulation, and charge
termination. It charges a battery in three phases: trickle
charging, constant current and constant voltage. No
external sense resistor is needed, and no blocking diode
is required due to the internal MOSFET architecture.
The thermal feedback regulates the charging current to
limit the chip temperature during high power operation
or high ambient temperature to maximize the charge
rate without risk of overheating. The charge voltage is
fixed at 4.2V, and the charge current can be
programmed externally with a single resistor. The
PT1502 automatically terminates the charge cycle when
the charge current drops to 1/10 the programmed value
after the final float voltage is reached. The PT1502
automatically re-starts the charge if the battery voltage
falls below an internal threshold.
FEATURES
z Integrated switch for USB/AC Adapter supply
z 220uA quiescent supply current(includes
step-down DC-DC converters , two low dropout
regulators and step-up DC-DC converter)
z Integrated single-cell lithium ion battery charger
‹ Auto thermal regulated
‹ Charging current up to 800mA
‹ Charging current adjusted by external
resistor
z Integrated step-down DC-DC converter
‹ Output voltage adjusted by external resistor
‹ Output current up to 600mA
‹ 1.5M Hz fixed switching frequency
‹ Over-current and over-temperature protection
z Integrated two low dropout regulators
‹ LDO1: output voltage 3.0Vup to 300mA
output current
PT1505
White LED Driver & PMU
for Portable Applications
The step-down converter is a high efficiency monolithic
current mode synchronous buck regulator with a
constant operation frequency. A main switch and a
synchronous switch are integrated in PT1502, the
device has high efficiency and no external Schottky
diode needed. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
Automatic burst mode operation at light loads provides
high efficiency. Internal 1.5MHz switching frequency
allowing the use of small surface mounts inductors and
capacitors. The output voltage can be adjusted by
external resistors.
The two low-dropout voltage regulators are designed
for portable and wireless applications. It can provide
better than 60dB PSRR at 1kHz. The output current can
be up to 300mA. One regulator’s output voltage is fixed
at 3.0V, and the other one is adjusted to 2.5V, 2.8V,
3.0V, 3.3V by two control pins.
The white LED step-up DC-DC converter is ideal for
driving light emitting diodes (LEDs) whose light
intensity is proportional to the current passing through
them, not the voltage across their terminals, as it
directly regulates output current A single external
resistor sets LED current between 5mA and 20mA,
which can then be easily adjusted using either a DC
voltage or a pulse width modulated (PWM) signal. Its
low 104mV feedback voltage reduces power loss and
improves efficiency. The OV pin monitors the output
voltage and turns off the converter if an over-voltage
condition is present due to an open circuit condition.
‹ LDO2: output voltage optional for
2.5V/2.8V/3.0V/3.3Vup to 300mA output
current
‹ PSRR: 60dB@1k Hz
‹ Over-current and over-temperature protection
z Integrated white LED step-up DC-DC converter
‹ Drives up to 8 series white LEDs
‹ Up to 87% Efficiency
‹ 1.25MHz Fixed Switching Frequency
‹ Low 104mV Feedback Voltage
‹ Open Load Shutdown
‹ Soft Start/PWM Dimming
z QFN285X5package
z RoHS compliant
China Resources Powtech (Shanghai) Limited
PT1505_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 1
Free Datasheet http://www.datasheet4u.com/




PowTech

PT1505 Datasheet Preview

PT1505 Datasheet

White LED Driver & PMU

No Preview Available !

PT1505
White LED Driver & PMU
for Portable Applications
APPLICATIONS
z MP3/4
z PDAs
z GSM/CDMA mobile phone
z Portable media players
z Digital Cameras
z Small LCD Displays
ORDERING INFORMATION
PACKAGE
QFN28
Note:
TEMPERATURE
RANGE
-40 oC to 85 oC
ORDERING PART
NUMBER
PT1505EQFN
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel
MARKING
PT1505
xxxxxX
TYPICAL APPLICATION CIRCUIT
Figure1. Typical application circuit 1 of PT1505 (MCU controls EN1 pin)
China Resources Powtech (Shanghai) Limited
PT1505_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 2
Free Datasheet http://www.datasheet4u.com/


Part Number PT1505
Description White LED Driver & PMU
Maker PowTech
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PT1505 Datasheet PDF





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