LM2596 Power Buck Regulator (150KHZ,3A) 020

LM2596 Power Buck Regulator (150KHZ,3A) 020

English article name: LM2596 simple switcher®power Converter kHz

3 A step-down Voltage regulator

Article Source: www.national.com version number: DS012583 Date: May 2002

Excerpt: Huangmingchang excerpt Date: May 3, 2007

Is it good to buy estimate: Production Center is in use

Price:

Overview:

The LM2596 series switching voltage regulators are step-down power management monolithic integrated circuits capable of outputting 3 a drive current with good linearity and load regulation characteristics. Fixed output versions are available in 3.3V, 5V, 12V, and an adjustable output version.

This voltage regulator can be used by adding a small number of external components. The device is internally integrated with a frequency compensation and fixed frequency generator.            With a switching frequency of 150KHz, a smaller filter element can be used compared to a low-frequency switching regulator. The package form includes a standard 5-pin TO-220 package and a 5-pin TO-263 surface mount package.

Because the device can use a common standard inductor, this optimizes the use of the LM2596, greatly simplifying the design of the switching power supply circuit.

There are other features of the device: under certain input voltages and output loads, the error of the output voltage can be guaranteed to be within the range of the ±4%, the oscillation frequency error is within the range of ±15%, and an external power outage can be achieved with only 80μa standby current With self-protection circuit (a two-stage reduced-frequency current-limit protection and an over-temperature complete protection circuit for power outages in exceptional cases).

Features:

※3.3v, 5V, 12V fixed voltage output and adjustable voltage output

※ Adjustable output voltage range 1.2v~37v,±4%

※ Package Type: TO-220 (T) and TO-263 (S)

※ Guaranteed output Load current 3A

※ Input voltage can be up to 40V

※ only 4 external components are required

※ Good linearity and load regulation characteristics

※150khz internal oscillator with fixed frequency

※ttl shut-off capability

※ Low power Standby mode, the typical IQ value is 80μa

※ High conversion efficiency

※ Easy to buy standard inductor

※ with overheat protection and current limit protection function

Application:

※ Simple high efficiency buck regulator

※ Switching voltage regulator on the card

※ Positive to negative voltage converter

Patent No.: 5382918

typical circuit (fixed output voltage version):

Package and Model:

※ Curved cross-pin, through hole package, 5 feet TO-220 (T)

Order type: lm2596t-3.3, lm2596t-5.0,lm2596t-12 or Lm2596t-adj

※ Surface mount Package, 5 feet TO-263 (S)

Order type: lm2596s-3.3, lm2596s-5.0, lm2596s-12 or Lm2596s-adj

Limit conditions:

Maximum supply voltage 45V

On/off pin input voltage -0.3≤v≤+25v

Feedback pin Voltage -0.3≤v≤+25v

Output voltage to ground (steady state) -1v

Internal limit of power consumption

Storage temperature -65°c to + 150°c

ESD susceptibility (human body mode) 2KV

Welding temperature

T package (Solder, 10 sec) +260°c

Maximum junction temperature + 150°c

Operating conditions:

Temperature range -40°c≤tj≤+125°c

Supply voltage 4.5V to 40V lm2596-3.3 electrical Parameters

Description: The item corresponding to the standard font is suitable for Tj=25℃, and the items corresponding to the bold text are suitable for the full temperature range.

Symbol	Significance	Test conditions	Typical values (Note 3)	Limit value (Note 4)	Unit Limit
System parameters (Note 5) test circuit 1
VOUT	Output voltage	4.75v£vin£40v, 0.2a£iload£3a	3.3	3.168/3.135 3.432/3.465	V V (min) V (max)
H	Efficiency	VIN = 12V, ILOAD = 3A	73		%

lm2596-5.0 Electrical Parameters

Description: The item corresponding to the standard font is suitable for Tj=25℃, and the items corresponding to the bold text are suitable for the full temperature range.

Symbol	Significance	Test conditions	Typical values (Note 3)	Limit value (Note 4)	Unit Limit
System parameters (Note 5) test circuit 1
VOUT	Output voltage	7v£vin£40v, 0.2a£iload£3a	5.0	4.800/4.750 5.200/5.250	V V (min) V (max)
H	Efficiency	VIN = 12V, ILOAD = 3A	80		%

lm2596-12 Electrical Parameters

Description: The item corresponding to the standard font is suitable for Tj=25℃, and the items corresponding to the bold text are suitable for the full temperature range.

Symbol	Significance	Test conditions	Typical values (Note 3)	Limit value (Note 4)	Unit Limit
System parameters (Note 5) test circuit 1
VOUT	Output voltage	15v£vin£40v, 0.2a£iload£3a	12.0	11.52/11.40 12.48/12.60	V V (min) V (max)
H	Efficiency	VIN = 25V, ILOAD = 3A	90		%

Lm2596-adj Electrical Parameters

Description: The item corresponding to the standard font is suitable for Tj=25℃, and the items corresponding to the bold text are suitable for the full temperature range.

Symbol	Significance	Test conditions	Typical values (Note 3)	Limit value (Note 4)	Unit Limit
System parameters (Note 5) test circuit 1
VFB	Feedback voltage	4.5v£vin£40v, 0.2a£iload£3a Vout is designed for 3V, circuit diagram 1	1.230	1.193/1.180 1.267/1.280	V V (min) V (max)
H	Efficiency	VIN = 12V, VOUT = 3V, ILOAD = 3A	73		%

all output voltage version electrical Parameters

Description: The item corresponding to the standard font suitable for Tj=25℃, the underlined bold italic word corresponds to the entire temperature range. Unless otherwise noted, the vin=12v corresponds to lm2596-3.3,lm2596-5.0,lm2596-adj,vin=24v corresponding to lm2596-12. iload=500ma.

Symbol	Significance	Test conditions	Typical values (Note 3)	Limit value (Note 4)	Unit Limit
System parameters (Note 5) test circuit 1
Ib	Feedback bias Current	Adjustable version only VFB = 1.3V	10	50/	NA NA (max)
FO	Oscillator frequency	(note 6)	150	127/ 173/173	KHz KHz (min) KHz (max)
Vsat	Saturation pressure Drop	IOUT = 3A (note 7, 8)	1.16	1.4/1.5	V V (max)
DC	Maximum duty factor (on)	(note 8)	100		%
Minimum duty factor (OFF)	(note 9)	0		%
ICL	Current limit	Peak current (note 7, 8)	4.5	3.6/3.4 6.9/7.5	A A (min) A (max)
IL	Output leakage Current	Output = 0V (note 7, 9)		50	Μa (max)
Output = -1v (Note 10)	2	30	Ma Ma (max)
IQ	Quiescent current	(note 9)	5	10	MA MA (max)
Istby	Standby quiescent current	On/OFF pin = 5V (OFF) (note 10)	80	200/	Μa Μa (max)
Qjc	Junction to Shell Thermal resistance	TO-220 or to