LM2596芯片资料

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 1/12

150kHz, 3A PWM Buck DC/DC Converter

LM2596-XXE5/F5

Description

The LM2596-XXE5/F5 series of regulators are monolithic ICs that provide all active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltage of 3.3V, 5V, 12V and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed- frequency oscillator.

The LM2596-XXE5/F5 series operates at a switching frequency of 150kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in standard 5-lead TO-220 and TO-263 packages with several different lead bend options. A standard series of inductors are available from several different manufacturers optimized for use with the LM2596-XXE5/F5 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring 80μA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

Features

● 3.3V, 5V, 12V, and adjustable output versions

● Adjustable version output voltage range, 1.3V to 37V±4% max over line and load conditions ● 150kHz±15% fixed switching frequency ● TTL shutdown capability

● Operating voltage can be up to 40V ● Output load current:3A

● TO220-5L and TO263-5L packages ● Low power standby mode.

● Thermal shutdown and current limit protection. ● High efficiency

● Built-in switching transistor on chip ● Requires only 4 external components ● Use readily available standard inductors

Applications

● Simple high-efficiency step-down (buck) regulator.

● Positive to negative converter (Buck-Boost). ● On-card switching regulators.

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 2/12

Pin Assignment

Block Diagram

Ordering Information

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 3/12

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit Supply Voltage VCC 45 V On/Off Pin Input Voltage VSD -0.3 ~ +25 V Feedback Pin Voltage VFB -0.3 ~ +25 V Output Voltage to Ground VOUT -1 V Power Dissipation PD Internally Limited W Operating Temperature Topr -40 ~ +125 ℃ Storage Temperature Tstg -65 ~ +150 ℃ Operating Voltage VOP +4.5 ~ +40 V

=ESD Susceptibility (Note 2) 2000 V

Electrical Characteristics (All Output Voltage Versions)

Specifications with boldface type are for full operating temperature range, the other type are for TJ=25°C.

(Unless otherwise specified, VIN=12V for the 3.3V, 5V, and adjustable version and VIN=24V for the 12V version, ILOAD=500mA)

Parameter Symbol Test Condition Min Typ MaxUnit

Device parameters

Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON)

Min Duty Cycle(OFF) Current Limit

Output Leakage Current Quiescent Current Standby Quiescent Current

50

- 10 nA

100

127 173fO 150 KHz(Note 6)

110 173

1.4

VSAT IOUT=3A (Note 7, 8) - 1.16 V

1.5 100 (Note 8)

DC - - % (Note 9) 0

3.6 6.9

ICL Peak Current 4.5 A ( Note 7, 8)

3.4 7.5

Output=0V (Note 7, 9) - - 50 μA IL

Output=-1V(Note 10) - 2 30 mA (Note 9) IQ - 5 10 mA Ib

Adjustable Version Only, VFB1.3V

200ISTBY ON/OFF pin=5V (Note 10) - 80 μA

250

TO-220-5L 2 - - θJC Junction to Case

TO-263-5L 3.5 - - ℃/W

50 Junction to - - θJA TO-220-5L

(Note11) TO-263-5L Ambient 23 - - ℃/WVIH VIL IIH IIL

Low (Regulator ON) High (Regulator OFF)

VLOGIC=2.5V (Regulator OFF) VLOGIC=0.5V (Regulator ON)

- 2.0 - -

1.3 5 0.02

0.6 - 15 5

V μA

Thermal Resistance ON/OFF Control

ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 4/12

Electrical Characteristics (Continued)

Specifications with boldface type are for full operating temperature range, the other type are for TJ=25°C.

Part No.

Parameter

Symbol

Conditions

Min

(Note 3) (Note 4)

Typ Max

Units

LM2596-3.3

Output Voltage

Efficiency

VOUT 4.75V≤VIN≤40V, 0.2A≤ILOAD≤3Aη VOUT η VOUT η VFB η

VIN=12V, ILOAD=3A

7V≤VIN≤40V, 0.2A≤ILOAD≤3A VIN=12V, ILOAD=3A

15V≤VIN≤40V, 0.2A≤ILOAD≤3A VIN=25V, ILOAD=3A

4.5V≤VIN≤40V, 0.2A≤ILOAD≤3AVOUT programmed for 3V VIN=12V, VOUT=3V, ILOAD=3A

LM2596-5.0

Output Voltage

Efficiency

LM2596-12

Output Voltage

Efficiency

Output

LM2596-ADJ Feedback

Efficiency

3.168 3.432

3.3 V

3.135 3.465- 73 - % 4.800 5.200

5.0 V

4.750 5.250- 80 - % 11.52 12.48

12.0 V

11.40 12.60- 90 - % 1.180 1.280

1.230 V

1.168 1.292- 77 - %

Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate

conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2 : The human body model is a 100pF capacitor discharged through a 1.5K resistor into each pin. Note 3 : Typical numbers are at 25℃ and represent the most likely norm.

Note 4 : All limits guaranteed at room temperature (standard face type) and at temperature extremes(bold face type). All room

temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

Note 5 : External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors

can affect switching regulator system performance.

Note 6 : The switching frequency is reduced when the second stage current limit is activated.

Note 7 : No diode, inductor or capacitor connected to output pin.

Note 8 : Feedback pin removed from output and connected to 0V to force the output transistor switch ON.

Note 9 : Feedback pin removed from output and connected to +12V for the 3.3V, 5V and adjustable version, and +15V for

the 12V version, to force the output transistor switch OFF.

Note 10 : VIN=40V.

Note 11 : Junction to Ambient thermal resistance. (With copper area of approximately 3 in²)

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 5/12

Typical Performance Characteristics (circuit of Figure 2)

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 6/12

Typical Performance Characteristics(Cont.)

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 7/12

Typical Performance Characteristics(Cont.)

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 8/12

Typical Performance Characteristics(Cont.)

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 9/12

Typical Application Circuit

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 10/12

TO-263-5L Dimension

Marking: Date CodeLM2596□□□ □□□□ Vout: 3.3V→-335.0V →-5012V→-12ADJ→blank 5-Lead TO-220-5L Plastic Package CYStek Package Code: E5 Style: Pin 1.Vin 2.Vout 3.GND 4.Feedback 5.ON/OFF

DIM

Inches Millimeters Inches Millimeters DIM

Min. Max. Min. Max. Min. Max. Min. Max. A 0.173 0.1 4.40 4.80 L5 0.244 0.260 6.20 6.60 b 0.030 0.039 0.76 1.00 c1 0.049 0.057 1.25 1.45 c 0.014 0.020 0.36 0.50 L 0.522 0.561 13.25 14.25 D 0.339 0.3 8.60 9.00 e 0.067 REF 1.70 REF E 0.386 0.409 9.80 10.4 L1 0.102 0.114 2.60 2. L4 0.579 0.602 14.7 15.3 φ 0.146 0.156 3.71 3.96

Notes: 1.Controlling dimension: millimeter

2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.

3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.

Material:

• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0

LM2596-XXE5/F5

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 11/12

TO-263-5L Dimension

Marking: LM2596□□□ Date Code□□□□ Vout: 3.3V →-335.0V→-5012V→-12ADJ→ blank Style: Pin 1.Vin 2.Vout 3.GND 4.Feedback 5.ON/OFF 5-Lead TO-263-5L Plastic Package CYStek Package Code: F5

DIM

Inches Millimeters Inches Millimeters DIM

Min. Max. Min. Max. Min. Max. Min. Max. A 0.173 0.1 4.40 4.80 c2 0.049 0.057 1.25 1.45 b 0.026 0.036 0.66 0.91 L2 0.050 REF 1.27 REF L4 0.000 0.012 0.00 0.30 D 0.339 0.3 8.60 9.00 c 0.014 0.020 0.36 0.50 e 0.067 REF 1.70 REF L1 0.090 0.110 2.29 2.79 L 0.575 0.622 14.6 15.8 E 0.386 0.409 9.80 10.4 θ 0° 8° 0° 8°

2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.

3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.

Notes: 1.Controlling dimension :millimeter

Material:

• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0

Recommended wave soldering condition

Product Pb-free devices

LM2596-XXE5/F5

Peak Temperature 260 +0/-5 °C

Soldering Time 5 +1/-1 seconds

CYStek Product Specification

CYStech Electronics Corp.

Spec. No. : C8F5

Issued Date : 2007.12.11 Revised Date : Page No. : 12/12

Recommended temperature profile for IR reflow

Profile feature Average ramp-up rate

(Tsmax to Tp) Preheat

−Temperature Min(TS min) −Temperature Max(TS max) −Time(ts min to ts max) Time maintained above: −Temperature (TL) − Time (tL)

Peak Temperature(TP) Time within 5°C of actual peak temperature(tp)

Ramp down rate

Time 25 °C to peak temperature

Important Notice:

Sn-Pb eutectic Assembly

3°C/second max. 100°C 150°C

60-120 seconds

183°C

60-150 seconds 240 +0/-5 °C 10-30 seconds 6°C/second max. 6 minutes max.

Pb-free Assembly 3°C/second max. 150°C 200°C

60-180 seconds

217°C

60-150 seconds 260 +0/-5 °C 20-40 seconds 6°C/second max. 8 minutes max.

Note : All temperatures refer to topside of the package, measured on the package body surface.

• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice.

• CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.

• CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.

LM2596-XXE5/F5

CYStek Product Specification