2024年3月19日发(作者：仍昌盛)
_______________________________________________________________________________________________________
XR3161
1.1MHz, High-Efficiency, Step-Up Converter for 7~8 White LEDs
General Description
The XR3161 is a current-mode and fixed
frequency boost converter with an
integrated N-FET to drive up to 7~8 white
LEDs in series. The series connection
allows the LED current to be identical for
uniform brightness. Its low on resistance
of N- FET and feedback voltage reduce
power loss and achieve high efficiency.
Fast 1.1MHz current-mode PWM operation
is available for input and output capacitors
and a small inductor while minimizing
ripple on the input supply. The OVP pin
monitors the output voltage and stops
switching if exceeds the over-voltage
threshold. An internal soft-start circuit
eliminates the inrush current during start-
up. It can driver 3(series)*9(parallel) LEDs
or 3(series)*12(parallel) LEDs.
The XR3161 also integrates under-
voltage lockout, over-temperature
protection, and current limit circuits. The
XR3161 is available in a SOT-23-6
package.
FEATURES
• Wide input Voltage from 2.5V to 6V
• 0.25V Reference Voltage
• Fixed 1.1MHz Switching Frequency
• High Efficiency up to 86%(8*4) or
93%(3*12)
• Wide Range for PWM Dimming (100Hz
to 200kHz)
• Under-Voltage Lockout Protection
• Over-Temperature Protection
• 29V Over voltage protection
• Can driver 3*9 WLEDs or 3*12 WLEDs
• <1μA Quiescent current During
Shutdown
• SOT23-6 Package
• Lead Free and Green Devices
Available (ROHS Compliant)
Applications
• Cell Phone and Smart Phone
• PDA,PMP,MP3
• Digital Camera
• White LED Display Backlighting
Figure 1. Typical Application Circuit 1
XySemi Inc - 1 -
REV0.4
_______________________________________________________________________________________________________
XR3161
ORDERING INFORMATION
PART
NUMBER
XR3161
TEMP RANGE
-40°C to 85°C
SWICHING
FREQUENCY
1.1MHZ
OVP (V)
29
ILIM (A)
1.6
PACKAGE
SOT23-6
PINS
6
PIN CONFIGURATION
Figure 2. PIN Configuration
PIN DESCRIPTION
PIN
NUMBER
1
PIN
NAME
LX
PIN DESCRIPTION
Switch pin, Connect this pin to inductor/diode here.
2 GND Ground.
Feedback Input, Reference voltage is 0.25 V, Connect this pin to cathode of the lowest
3 FB
LED calculate resistor value according to R1=0.25V/I.
Chip Enable (Active High). Voltage sensing input to trigger the function of over voltage
protection. Note that this pin is high impedance. There should be a pull low 100kΩ
4 EN
resistor connected to GND when the control signal is floating.
5 OVP
Over Voltage Protection Pin. Voltage sensing input to trigger the function of over voltage
protection. Leave it unconnected to disable this function.
Power supply, Bypass 1uF capacitor to GND to reduce the input noise.
6 Vin
ABSOLUTE MAXIMUM RATINGS
(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating
conditions for long periods may affect device reliability.)
PARAMETER VALUE UNIT
XySemi Inc - 2 -
REV0.4
2024年3月19日发(作者：仍昌盛)
_______________________________________________________________________________________________________
XR3161
1.1MHz, High-Efficiency, Step-Up Converter for 7~8 White LEDs
General Description
The XR3161 is a current-mode and fixed
frequency boost converter with an
integrated N-FET to drive up to 7~8 white
LEDs in series. The series connection
allows the LED current to be identical for
uniform brightness. Its low on resistance
of N- FET and feedback voltage reduce
power loss and achieve high efficiency.
Fast 1.1MHz current-mode PWM operation
is available for input and output capacitors
and a small inductor while minimizing
ripple on the input supply. The OVP pin
monitors the output voltage and stops
switching if exceeds the over-voltage
threshold. An internal soft-start circuit
eliminates the inrush current during start-
up. It can driver 3(series)*9(parallel) LEDs
or 3(series)*12(parallel) LEDs.
The XR3161 also integrates under-
voltage lockout, over-temperature
protection, and current limit circuits. The
XR3161 is available in a SOT-23-6
package.
FEATURES
• Wide input Voltage from 2.5V to 6V
• 0.25V Reference Voltage
• Fixed 1.1MHz Switching Frequency
• High Efficiency up to 86%(8*4) or
93%(3*12)
• Wide Range for PWM Dimming (100Hz
to 200kHz)
• Under-Voltage Lockout Protection
• Over-Temperature Protection
• 29V Over voltage protection
• Can driver 3*9 WLEDs or 3*12 WLEDs
• <1μA Quiescent current During
Shutdown
• SOT23-6 Package
• Lead Free and Green Devices
Available (ROHS Compliant)
Applications
• Cell Phone and Smart Phone
• PDA,PMP,MP3
• Digital Camera
• White LED Display Backlighting
Figure 1. Typical Application Circuit 1
XySemi Inc - 1 -
REV0.4
_______________________________________________________________________________________________________
XR3161
ORDERING INFORMATION
PART
NUMBER
XR3161
TEMP RANGE
-40°C to 85°C
SWICHING
FREQUENCY
1.1MHZ
OVP (V)
29
ILIM (A)
1.6
PACKAGE
SOT23-6
PINS
6
PIN CONFIGURATION
Figure 2. PIN Configuration
PIN DESCRIPTION
PIN
NUMBER
1
PIN
NAME
LX
PIN DESCRIPTION
Switch pin, Connect this pin to inductor/diode here.
2 GND Ground.
Feedback Input, Reference voltage is 0.25 V, Connect this pin to cathode of the lowest
3 FB
LED calculate resistor value according to R1=0.25V/I.
Chip Enable (Active High). Voltage sensing input to trigger the function of over voltage
protection. Note that this pin is high impedance. There should be a pull low 100kΩ
4 EN
resistor connected to GND when the control signal is floating.
5 OVP
Over Voltage Protection Pin. Voltage sensing input to trigger the function of over voltage
protection. Leave it unconnected to disable this function.
Power supply, Bypass 1uF capacitor to GND to reduce the input noise.
6 Vin
ABSOLUTE MAXIMUM RATINGS
(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating
conditions for long periods may affect device reliability.)
PARAMETER VALUE UNIT
XySemi Inc - 2 -
REV0.4