Download Typical Application Diagram

LED Buck/Boost Constant-Current Driver IC QX5278
Summary
QX5278 is a buck-boost constant-current LED driver chip, especially suitable for LED light
implementations powered by lithium batteries or triple-cell batteries. When the supply voltage is smaller
than the break-over voltage of the LED light, QX5278 functions in boost mode; when the supply voltage
is higher than the break-over voltage of the LED light, QX5278 functions in buck mode.
Main Features
Typical Application Diagram
Ø Operating voltage：2.4V~5.5V
Ø LED current：<500mA
Ø LED current determined by external resistor
Ø Efficiency：up to 90%
Ø Under voltage protection：2.4V
Over voltage protection：5V
Packaging
Current accuracy：±5%
Typical Parameter Graphs
Ø
Integrated Schottky Diode
SOP8
Unless otherwise stated, TA = 25 °C
Ø Only an external inductor is requierd
Ø High Efficiency
Applications
Ø Low quiescent current: 17uA
Lithium-battery powered LED lights
Triple-cell battery powered LED lights
LED High-power DC-DC Buck Constant-Current Driver IC QX9920
Summary
QX9920 is a highly stable and reliable constant-current LED driver with high efficiency. It is especially
suited to drive several high power and high luminance LEDs in series.QX9920 uses fixed off-time and
peak current control mode and its operating frequency can vary up to 1MHz, which not only reduces the
dimensions of inductor, capacitor and PCB but also improves efficiency. The minimum off-time is 620ns
and the off-time can be adjusted by changing the external capacitor, and the operating frequency also
can be adjusted according to the need of customers.
Main Features
Typical Application Diagram
Ø Wide Range Input Voltage:2.5V to 100V
Ø High Efficiency: Up to 90%
Ø Maximum Operating Frequency: 1MHz
Ø UVLO Voltage: 2.5V
Ø Peak Current Sense Voltage: 250mV
Ø Adjustable Luminance With PWM Signal
Packaging
Applied to EN Pin
Typical Parameter Graphs
Ø
Adjustable Off-time
SOT23-6
Unless otherwise stated, VDD = 5V, TA = 25 °C
Over voltage protection：5V
Current accuracy：±5%
Applications
Ø Integrated Schottky Diode
Flat
screen
display, LED
backlight,
Bicycle light, LED
Ø Only
an external
inductor
is requierd
spotlight
, Glare flashlight
Ø High Efficiency
Ø Low quiescent current: 17uA
LED 12/24V Buck External MOS Constant-Current Driver IC QX5241
Summary
QX5241 is a step-down high-brightness LED constant-current driver with high accuracy. A high-side
current-sense resistor adjusts the output current, which minimizes the number of external components
while delivering an LED current with ±1% accuracy, and a dedicated PWM input (DIM) makes a wide
range of pulsed dimming feasible. A hysteretic control algorithm ensures excellent input-supply rejection
and fast response to load transients and PWM dimming. QX5241 features a 20% inductor current ripple
and operates up to 1MHz switching frequency.
QX5241 is well suited for applications requiring a wide input voltage range from 5.5V to 36V, and
Typical Application Diagram
Main
Features
operates over the -20℃ to 85℃ automatic temperature range.
Ø Maximum Output Current: 2.5A
Ø High Efficiency: 96%
Ø High-side Current Sense
Ø Maximum Dimming Frequency: 5KHz
Ø Hysteretic Control: No Compensation
Ø Maximum Operating frequency: 1MHz
Packaging
Ø High Current Accuracy: Up to ±1%
Typical Parameter Graphs
Ø
Wide input voltage range: 5.5V to 36V
SOT23-6
Unless otherwise stated, VDD = 5V, TA = 25 °C
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Applications
Ø Adjustable Luminance With PWM Signal
Flashlights, electric car lights, bicycle lights, automatic car
Applied to EN Pin
lights, spotlights, LED driver power supply
Ø Adjustable Off-time
Over voltage protection：5V
Current accuracy：±5%
Ø Integrated Schottky Diode
Ø Only an external inductor is requierd
Ø High Efficiency
Ø Low quiescent current: 17uA
LED Linear Buck Fixed-Output Constant-Current Driver IC QX7135
Summary
QX7135 is a constant current regulator for LED driver with low quiescent current and low
dropout voltage. The output current ranges from 100mA to 380mA with 10mA step.
In addition to LEDs, QX7135 need not other external components to work normally.
QX7135 includes Soft-start Circuit, Thermal Protection Circuit, Bandgap Circuit, UVLO
Protection and Short Circuit Protection.
QX7135 adopts SOT89-3 package.
input voltage range from 5.5V to 36V, and operates over the -20℃ to 85℃ automatic temperature range.
Main Features
Typical Application Diagram
Ø Power Supply Voltage: 2.7~5.5V
Ø Sink Current: 100mA to 380mA With 10mA
Step
Ø Current Accuracy: ±5%
Ø Thermal Protection: 120 oC
Ø Low Dropout Voltage: 150mV at 350mA
Packaging
Ø Low Voltage Protection: 2.5V
Typical Parameter Graphs
Ø
Soft Start
SOT89-3
Unless otherwise stated, VDD = 5V, TA = 25 °C
Ø LED Short Circuit Protection
Ø Maximum Operating frequency: 1MHz
Applications
Ø High Current Accuracy: Up to ±1%
Flashlight, mobile power supplies, mining lights
Ø Wide input voltage range: 5.5V to 36V
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Ø Adjustable Luminance With PWM Signal
Applied to EN Pin
Ø Adjustable Off-time
Over voltage protection：5V
Current accuracy：±5%
Ø Integrated Schottky Diode
Ø Only an external inductor is requierd
Ø High Efficiency
Ø Low quiescent current: 17uA
LED High-power DC-DC Buck Constant-Current Driver IC QX5305
Summary
QX5305 is a high efficient boost type LED driver IC. It is especially suited to drive several high
power and high luminance LEDs in series.
QX5305 uses fixed off-time control scheme, and 1MHz switching frequency can be achieved.
QX5305 set the off-time by an external capacitor, the minimum off-time is 620ns and the offtime can be adjusted by changing the external capacitor, and the operating frequency also can
be adjusted according to the need of customers.
QX5305 regulates the current flowing through LEDs to set the luminance of LEDs by changing the external
Main Features
Typical Application Diagram
resistor, on the other hand, the luminance of LEDs also can be regulated by a PWM signal applied to EN pin.
input
voltage
rangeup
from
5.5V to 36V, and operates over the -20℃ to 85℃ automatic temperature range.
Ø High
Efficiency:
to 95%
Ø Switching Frequency: up to 1MHz
Ø Wide Range Input Voltage:3.6V to 100V
Ø UVLO Voltage: 2.5V
Ø Peak Current Sense Voltage: 250mV
Ø Adjustable Luminance With PWM
Packaging
Signal Applied to EN Pin
Typical Parameter Graphs
SOT8
Ø
Adjustable Off-time
Unless otherwise stated, VDD = 5V, TA = 25 °C
Ø Internal Current Sampling
Applications
Leading Edge Blanking Circuit
Ø
Dropout
Voltage: 150mVLED
at 350mA
LEDLow
light
cup, Battery-powered
light strings,
Ø
Low Voltage
Protection:
2.5V
Flatscreen
LED backlight,
Constant-current
charger
Ø
Soft Start
control,
High-power LED lighting
Ø LED Short Circuit Protection
Ø Maximum Operating frequency: 1MHz
Ø High Current Accuracy: Up to ±1%
Ø Wide input voltage range: 5.5V to 36V
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Ø Adjustable Luminance With PWM Signal
Applied to EN Pin
Ø Adjustable Off-time
Over voltage protection：5V
Current accuracy：±5%
Ø Integrated Schottky Diode
Ø Only an external inductor is requierd
Ø High Efficiency
Ø Low quiescent current: 17uA
LED Linear Buck Output-adjustable Constant-Current Driver IC QX7136
Summary
QX7136 is a linear constant current LED driver chip. In addition to LEDs, QX7136 also needs the external
connection of a NMOS and a resistor to set the LED current from 100mA to 3000mA. QX7136 includes
Soft-start Circuit, Thermal Protection Circuit, Bandgap Circuit, UVLO Protection, Short Circuit Protection.
When the input voltage is higher, or when the output current is larger, the power consumption of
QX7136 is larger, then QX7136 will go into Thermal Protection status to reduce the output current, which
can effectively protect the chip from damage caused by overheating when the junction temperature has
exceeded 120 oC .
Typical
Application
Diagram
QX5305 regulates
the current flowing through LEDs to set the luminance
of LEDs
by changing the
external
Main
Features
resistor, on the other hand, the luminance of LEDs also can be regulated by a PWM signal applied to EN pin.
Ø Power Supply Voltage: 2.7~5.5V
input voltage range from 5.5V to 36V, and operates over the -20℃ to 85℃ automatic temperature range.
Ø Extensible Power Supply: Above 400V
Ø Sink Current: 100mA~ 3000mA
Ø Current Accuracy: ±6%
Ø Thermal Protection: 120 oC
Ø Low Voltage Protection: 2.5V
Packaging
Ø Soft-start
Ø
Adjustable Luminance With PWM
SOT89-5
Signal Applied to EN Pin
Applications
Ø
Adjustable Off-time
Ø
Internal Current Sampling
Linear LED lighting driver
Leading
Edgelamplights,
Blankingmining
Circuitlights, signal
LED flashlights,
Ø
Low Dropout Voltage: 150mV at 350mA
lights
Ø Low Voltage Protection: 2.5V
Ø Soft Start
Ø LED Short Circuit Protection
Ø Maximum Operating frequency: 1MHz
Ø High Current Accuracy: Up to ±1%
Ø Wide input voltage range: 5.5V to 36V
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Ø Adjustable Luminance With PWM Signal
Applied to EN Pin
Ø Adjustable Off-time
Over voltage protection：5V
Current accuracy：±5%
Ø Integrated Schottky Diode
Ø Only an external inductor is requierd
Typical Parameter Graphs
Unless otherwise stated, VDD = 5V, TA = 25 °C
LED Two-cell Battery Flashlight Driver IC QX5237
Summary
QX5237 is suitable for LED flashlight drivers powered by two dry battery cells. The peripheral circuit of
QX5237 boasts a simple design, high efficiency, and only needs an external inductance element to form
an LED flashlight driver circuit board. QX5237 is reliable, easily usable and consistent/uniform in
production. It can achieve different levels of brightness through the adjustment of the external inductor.
QX5305 regulates the current flowing through LEDs to set the luminance of LEDs by changing the
external resistor, on the other hand, the luminance of LEDs also can be regulated by a PWM signal
applied to EN pin.
Application
Diagram
input voltage
range from 5.5V to 36V, and operates over theTypical
-20℃ to 85℃
automatic temperature
range.
Main
Features
Ø Voltage input range: 1.6V - 3.2V
Ø Maximum output current: >100mA
Ø High efficiency: up to 80%
Ø Only need an external inductor
Ø LED driver capability: three to six 20mA LED
lights
Packaging
TO-92 or SOT23 packaging
Ø
Low Voltage
SOT23-3
TO-92 Protection: 2.5V
Ø Soft-start
Ø
Adjustable Luminance With PWM
Applications
Signal Applied to EN Pin
LED flashlights powered by two dry battery cells
Ø Adjustable Off-time
Ø Internal Current Sampling
Leading Edge Blanking Circuit
Ø Low Dropout Voltage: 150mV at 350mA
Ø Low Voltage Protection: 2.5V
Ø Soft Start
Ø LED Short Circuit Protection
Ø Maximum Operating frequency: 1MHz
Ø High Current Accuracy: Up to ±1%
Ø Wide input voltage range: 5.5V to 36V
Ø Maximum Output Power: 25W
Ø 5V, 5mA On-chip Regulator
Ø Adjustable Luminance With PWM Signal
Applied to EN Pin
Ø Adjustable Off-time
Over voltage protection：5V
Current accuracy：±5%
Typical Parameter Graphs
Unless otherwise stated, VDD = 5V, TA = 25 °C
LED Single-cell Battery Flashlight Driver IC QX5231
Summary
QX5231 is suitable for the application of single-cell or two dry battery cells for LED drivers.
The peripheral circuit for QX5231 has a simple design and only needs one inductive element to form an
LED flashlight driver circuit board.
QX5231 is reliable, efficient, has a wide voltage range, is easy to use, and consistent in its production. It
can achieve different levels of brightness through the adjustment of the external inductor.
QX5231 uses TO-92 and SOT23 packaging.
Main Features
Typical Application Diagram
Ø Voltage input range: 0.9V-3.2V
Ø Maximum current output: >100mA
Ø High efficiency: up to 85%
Ø Only need to add an external inductor
Ø LED driver capability: three to six 20mA LED light
TO-92 or SOT23 packaging
Packaging
SOT23-3
Applications
LED flashlight driver constant-current supply
Typical Parameter Graphs
Unless otherwise stated, VDD = 5V, TA = 25 °C
High-power LED Flashlight Driver IC QX5235
Summary
QX5235 is a ASIC (application-specific integrated circuit) designed specifically for high-power
LED lighting installations.
The operating voltage of QX5235 is 0.8V - 4.0V, which is most suitably powered by AA or
NiMH batteries.
QX5235 uses SOT-89-3 packaging.
Main Features
Typical Application Diagram
Ø Operating voltage：0.8V~4.0V
Ø Current output：100mA~800mA
Ø Effiency：>80%
Ø TO-92 or SOT23 packaging
Packaging
SOT89-3
Applications
1W,3W high-power LED drivers
Typical Parameter Graphs
Unless otherwise stated, VDD = 5V, TA = 25 °C
LED Single-Cell Battery High-Efficiency Flashlight Driver IC QX5236
Summary
QX5236 is an ASIC chip designed specifically for the application of single-cell dry battery cell for LED
flashlights. The product uses large-scale IC technologies, and only needs an external inductance
component to form an LED flashlight driver circuit board. QX5236 has excellent performance, high
reliability, easy usability, and good production uniformity. The variety of current amounts needed can be
satisfied through the adjustment of the external inductance component.
Main Features
Ø Voltage input range: 0.9 V -1.5 V
Ø Maximum output current: beyond 200mA
Ø High efficiency
Packaging
SOT23-3 TO92
Applications
LED flashlights
Typical Application Diagram
LED Flashlight Controller QX5256
Summary
QX5256 is a controller chip designed specifically for LED flashlights, mining lights and
headlights. It supports a series of LED lights and is controlled by a switch. QX5256 has two
operating modes: under the 1st, the LED light can alternate between "all bright" and "pulsing";
under the 2nd mode, the LED light can go from the "all bright" status to "dim light", which is
1/4 the brightness, and then to "pulsing", and alternate between the three states.
The maximum operating current for QX5256 is 200mA.
Main Features
Ø Operating voltage：2V~6V
Ø Operating mode #1：all bright, pulsing
Ø Operating mode #2：all bright, dim light, pulsing
Ø Maximum LED current：200mA
Ø Current expandable to：2A
Under voltage protection：2V
Packaging
SOT23 SOT23-5 TO92
Applications
LED flashlights
LED mining lights, headlights
Typical Application Diagram
Low Power PFM DC-DC Boost IC QX2303
Summary
The QX2303 Series are PFM step-up DC-DC converters with high efficiency, low ripple and high
operation frequency. The QX2303 Series need only four external components to realize step-up
conversion from low input battery voltage to the voltage needed, and they are applied to one to four
battery- cells application.
The QX2303 Series adopt low dissipation and high performance reference circuit, with trimming
technique in manufacture, which ensure high precision and low temperature drift of the output voltage.
The precision of output voltage precede ±2.5%, and the highest efficiency is 89%.
Main Features
Typical Application Diagram
Ø 300KHz Maximum Operating Frequency
Ø 2.5V to 5.0V Output Voltage With 0.1V step
Ø Low Start-up Voltage: 0.8V at 1mA
Ø ±2.5% Output Voltage Accuracy
Ø Up to 89% Efficiency
Ø Output Current: 300mA at 2.5V Input, 3.3V
Packaging
Output voltage
Ø
Low SOT23-5
Ripple and
Low Noise
SOT23
SOT89-3
TO-92
Ø Four external components needed only
Applications
1-3 dry battery cell electronic equipment, LED
flashlights, LED lights, sphygmomanometers, Electronic
dictionaries, automobile anti-theft devices, battery
chargers, VCR, PDA and other hand-held electronic
devices
Typical Parameter Graphs
Unless otherwise stated, TA = 25 °C, VOUT =
3.3V, CIN = 47uF, COUT = 100uF, L1 = 47uH
High-efficiency Low-energy PFM DC-DC Synchronized Step IC QX2304
Summary
QX2304 is a high-efficiency, low-power, low-ripple, high operating frequency PFM synchronized boost
DC-DC Converter. QX23-4 only needs 3 external components to convert battery voltage boost to the
needed output. The voltage output of QX2304 can be adjusted to fit varying load output situations
through internal adjustment selections (increment by 0.1V). The voltage output of the QX2304 system
produces low ripple and low noise. QX2304 has an internal synchronized power switch tube which lowers
the tube damage, allowing up to an efficiency of 95%. QX2304 works in PFM mode, which lowers the
damage in light load mode and increases the equipment usage period.
Main Features
Typical Application Diagram
Ø Highest efficiency: 95%
Ø Highest operating frequency: 300 KHz
Ø Low static current: 15uA
Ø Selectable voltage output: 2.5V - 3.6V
Ø Output accuracy: 2.5%
Ø Output Current: 300mA at 2.5V Input, 3.3V
Packaging
Output voltage
Ø
Low SOT23-5
Ripple and
Low Noise
SOT23
SOT89-3
Ø Four external components needed only
Applications
1-2 dry battery cell electronic equipment, LED
flashlights, LED lights, sphygmomanometers, Electronic
dictionaries, automobile anti-theft devices, battery
chargers, VCR, PDA and other hand-held electronic
devices
Typical Parameter Graphs
Unless otherwise stated, TA = 25 °C, CIN =
47uF, COUT = 100uF, L1 = 47uH
Synchronized Boost DC/DC Converter QX3400
Summary
QX3400
Typical Application
Diagram
Main Features
Ø Converter efficiency: 96% or more
Ø Low voltage startup: 0.9V
Ø Shutoff current: <1uA
Ø Input voltage: 0.9V – 5.0V
Ø Output voltage: 2.5V – 5.0V (Schottky diode: 5.2V)
Ø Output Current: 300mA at 2.5V Input, 3.3V
Packaging
Output voltage
Ø
Low Ripple and Low Noise
SOT23-6
Ø Four external components needed only
Applications
Digital cameras, MP3s, hand-held computers, PDAs, cell
phones, carry-on media players, cordless telephones,
DSL modem, PC cards
Typical Parameter Graphs
Unless otherwise stated, TA = 25 °C,
C1=C2=22uF, L1=2.2uH
Single Signal Light Lithium Battery-Charger Management IC QX4054
Summary
QX4504 is a complete single-cell lithium battery constant-current linear charger controller. Only a
minimal amount of external components are needed for the application of portable products. QX4504 is
designed specifically for USB power source charging. QX4504 can differentiate to operate in one of three
modes (trickle charging, constant-current charging, constant-voltage charging) according to different
battery voltages. The charging current for trickle charging is 1/10 of the full-charge current; the
constant-current charging mode operates at the full-charge current; the constant-voltage charging
mode operates at a fixed voltage of 4.2V.
Main Features
Typical Application Diagram
Ø Power source voltage: 4.25V – 6.0V
Ø Programmable charging current: highest 800mA
Ø Preset 4.2V charging voltage accuracy: 1%
Ø Shutoff mode supporting current: 25uA
Ø Trickle charging threshold voltage:
Ø Output Current: 300mA at 2.5V Input, 3.3V
Packaging
Output voltage
Ø
Low Ripple and Low Noise
SOT23-5
Ø Four external components needed only
Applications
Mobile telephones, PDA and other portable devices,
lithium-battery-powered chargers, Bluetooth devices
Typical Parameter Graphs