XL1509-ADJ

Application

Manufacturer

UMW

Overview

Part: XL1509 (Manufacturer: null)

Type: Step-down DC/DC Converter

Key Specs:

Output Load Current: 3A
Input Voltage Range: 4.5V to 40V
Fixed Switching Frequency: 150KHz
Adjustable Output Voltage Range: 1.23V to 37V
Output Voltage Tolerance: ±4%

Features:

3.3V, 5V, 12V and Adjustable Output Version
Output Adjustable Voltage From 1.23V to 37V
Fixed 150KHz Switching Frequency
Voltage Mode Non-synchronous PWM Control
ON/OFF Shutdown Control
Wide 4.5V to 40V Input Voltage Range
Output Load Current: 3A
Low Power Standby Mode
Built-in Switching Transistor on Chip
Internal compensation
Thermal shutdown
Current limit

Applications:

Simple High-Efficiency Step-down Regulator
On-card Switching Regulators
Positive to Negative Converter

Package:

SOP-8: dimensions not specified

Features

3.3V,5V,12V and Adjustable Output Version
Output Adjustable Voltage From 1.23V to 37V
Fixed 150KHz Switching Frequency
Voltage Mode Non-synchronous PWM Control
ON/OFF Shutdown ControlInput
Wide 4.5V to 40V Input Voltage Range
Output Load Current:3A
Low Power Standby Mode
Built-in Switching Transistor on Chip

Pin Configuration

Name	Description
V IN	Supply Voltage Input
Output	Power Switching Output
GND	Ground
FB	Output Voltage Feedback Control
EN	ON/OFF Shutdown

Block Diagram

Absolute Maximum Ratings

Characteristics	Symbol	Value	Unit
Supply Voltage	VIN	+40	V
ON/OFF pin input voltage	VSD	-0.3~VIN	V
Feedback pin voltage	VFB	-0.3~VIN	V
Output voltage to ground	VOUT	-1	V
Power dissipation	PD	Internallylimited	W
Storage temperature	Tstg	-65~+150	C
Operating temperature	Topr	-40~+125	C
Operating voltage	VOP	+4.5~+40	V

Electrical Characteristics

(Refer to the test circuit, VIN=12V for 3.3V,5V, adjustable version and VIN=24V for the 12V version, ILOAD=0.5A)

Characteristics	Symbol	Test Conditions	Min	Typ	Max	Unit
Feedback Bias Current	Ігв	V _FB =1.3V (Adjustable version only)		50	100	nA
Oscillator Frequency	Fosc		127	150	173	kHz
Saturation Voltage	Vsat	IOUT=2A,No outside circuit VFB=0Vforce driver on		1.2	1.5	V
Max. Duty Cycle(ON)	- DC	V _FB =0V force driver on	93	98		%
Min. Duty Cycle(OFF)		V _FB =12V force driver off		0		70
Current Limit	IcL	Peakcurrent,Nooutside circuit VFB=0Vforce driver on	3.0	4.0		A
Output Leakage Current (Output=0)	- IL	No outside circuit VFB=12V force driver off			2	mA
Output Leakage Current (Output=-1)		Vin=40V		5	20	mA
Quiescent Current	ΙQ	V _FB =12V force driver off		5	10	mA
Standby Quiescent Current	Іѕтвy	ON/OFFpin=5V V _IN =40V		50	200	μA
ON/OFF pin Logic Input	VIL	Low(regulator ON)			0.6	V
Threshold Voltage	Vін	High(regulator OFF)	2.0			V
ON/OFF pin Logic Input Current	Ін	VLOGIC=5.0V(OFF)		12	30
ON/OFF pin Input Current	IL	VLOGIC=0.5V(ON)		0	10	μA
Thermal Resistance	Өлc	Junction to case		15		°C/W
Thermal Resistance with Copper Copper Area of Aapproximately 3 in ²	Өјa	Junction to ambient		70		°C/W

Characteristics	Symbol	Test Conditions	Min	Typ	Max	Unit
XL1509-ADJ
Output Feedback	V _FB	4.5V ≤ VIN ≤ 40V 0.2A ≤ ILOAD ≤ 3A VOUT pxrogrammed for 3V	1.193	1.230	1.267	٧
Efficiency		VIN = 12V, ILOAD = 3A		74		%
XL1509-3.3V
Output Voltage	Voит	4.75V ≤ V IN ≤ 40V 0.2A ≤ I LOAD ≤ 3A	3.168	3.300	3.432	V
Efficiency		VIN=12V, ILOAD = 3A		76		%
XL1509-5V
Output Voltage	Voит	7V < ViN < 40V 0.2A ≤ ILOAD ≤ 3A	4.80	5.00	5.20	V
Efficiency		VIN = 12V, ILOAD = 3A		83		%
XL1509-12V
Output Voltage	Voит	{c} 15V ≤ V In ≤ 40V 0.2A ≤ I LOAD ≤ 3A	11.52	12.00	12.48	V
Efficiency		VIN = 25V, ILOAD = 3A		90		%

Electrical Characteristics

(Refer to the test circuit, VIN=12V for 3.3V,5V, adjustable version and VIN=24V for the 12V version, ILOAD=0.5A)

Characteristics	Symbol	Test Conditions	Min	Typ	Max	Unit
Feedback Bias Current	Ігв	V _FB =1.3V (Adjustable version only)		50	100	nA
Oscillator Frequency	Fosc		127	150	173	kHz
Saturation Voltage	Vsat	IOUT=2A,No outside circuit VFB=0Vforce driver on		1.2	1.5	V
Max. Duty Cycle(ON)	- DC	V _FB =0V force driver on	93	98		%
Min. Duty Cycle(OFF)		V _FB =12V force driver off		0		70
Current Limit	IcL	Peakcurrent,Nooutside circuit VFB=0Vforce driver on	3.0	4.0		A
Output Leakage Current (Output=0)	- IL	No outside circuit VFB=12V force driver off			2	mA
Output Leakage Current (Output=-1)		Vin=40V		5	20	mA
Quiescent Current	ΙQ	V _FB =12V force driver off		5	10	mA
Standby Quiescent Current	Іѕтвy	ON/OFFpin=5V V _IN =40V		50	200	μA
ON/OFF pin Logic Input	VIL	Low(regulator ON)			0.6	V
Threshold Voltage	Vін	High(regulator OFF)	2.0			V
ON/OFF pin Logic Input Current	Ін	VLOGIC=5.0V(OFF)		12	30
ON/OFF pin Input Current	IL	VLOGIC=0.5V(ON)		0	10	μA
Thermal Resistance	Өлc	Junction to case		15		°C/W
Thermal Resistance with Copper Copper Area of Aapproximately 3 in ²	Өјa	Junction to ambient		70		°C/W

Characteristics	Symbol	Test Conditions	Min	Typ	Max	Unit
XL1509-ADJ
Output Feedback	V _FB	4.5V ≤ VIN ≤ 40V 0.2A ≤ ILOAD ≤ 3A VOUT pxrogrammed for 3V	1.193	1.230	1.267	٧
Efficiency		VIN = 12V, ILOAD = 3A		74		%
XL1509-3.3V
Output Voltage	Voит	4.75V ≤ V IN ≤ 40V 0.2A ≤ I LOAD ≤ 3A	3.168	3.300	3.432	V
Efficiency		VIN=12V, ILOAD = 3A		76		%
XL1509-5V
Output Voltage	Voит	7V < ViN < 40V 0.2A ≤ ILOAD ≤ 3A	4.80	5.00	5.20	V
Efficiency		VIN = 12V, ILOAD = 3A		83		%
XL1509-12V
Output Voltage	Voит	{c} 15V ≤ V In ≤ 40V 0.2A ≤ I LOAD ≤ 3A	11.52	12.00	12.48	V
Efficiency		VIN = 25V, ILOAD = 3A		90		%

Absolute Maximum Ratings

Characteristics	Symbol	Value	Unit
Supply Voltage	VIN	+40	V
ON/OFF pin input voltage	VSD	-0.3~VIN	V
Feedback pin voltage	VFB	-0.3~VIN	V
Output voltage to ground	VOUT	-1	V
Power dissipation	PD	Internallylimited	W
Storage temperature	Tstg	-65~+150	C
Operating temperature	Topr	-40~+125	C
Operating voltage	VOP	+4.5~+40	V

Thermal Information

The SOP-8(SOIC-8) package needs a heat sink under most conditions. The size of the heatsink depends on the input voltage, the output voltage, the load current and the ambient tem perature. The XL1509 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the XLl509 (SOP-8 package) operating as a buckswitching regulator in an ambient temperature of 25°C(still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures requires more heat sinker.

For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (One exception is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat(lower thermal resistance) to the surrounding air,and moving air lowers the thermal resistance even further.

Package thermal resistance and junction temperature increments are all approximate. The increments are affected by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board.

The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
XL1509	UMW	—
XL1509-12V	UMW	—
XL1509-3.3V	UMW	—
XL1509-5V	UMW	—

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