G5E2596M GTM

Document overview

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Technical content

Features

&3.3V, 5.0V, 12V and adjustable output versions &Guaranteed 3A output current &Operating voltage can be up to 22V &150kHz fixed frequency internal oscillator &Built-in TTL On/Off control &TTL Shutdown Capability &Uses readily available standard inductors &Thermal shutdown and current limit protection

Applications

&High-efficiency step-down regulator &One-ch switching regulators simple &Positive to negative converter Package Dimensions A 4.40 4.80 L5 6.20 6.60 b 0.76 1.00 c1 1.25 1.45 c 0.36 0.50 L 13.25 14.25 D 8.60 9.00 e 1.70 REF. E 9.80 10.4 L1 2.60 2.89 L4 14.7 15.3 Ø 3.71 3.96 Block Diagram

G5E2596M Page: 2/6 ISSUED DATE :2005/12/26 REVISED DATE :2006/03/13B Pin Function Pin Name Pin# Function VIN 1 This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching current needed by regulator. Output 2 Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately -0.5V, with a duty cycle of approximately VOUT/VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be keep to a minimum. Ground 3 Circuit ground Feedback(FB) 4 Senses the regulated output voltage to complete the feedback loop. ON/OFF(SD) Allows the switching regulator circuit to be shutdown using logic level signals. Thus drop the total input supply current to approximately 150A. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to the ground pin. Absolute Maximum Ratings Parameter Symbol Ratings Unit Supply Voltage VCC 24 V ON/OFF Pin Input Voltage VSD -0.3 ~ +18 V Feedback Pin Voltage VFB -0.3 ~ +18 V Output Voltage to ground VOUT -1 V Power Dissipation PD Internally Limited W Storage Temperature TST -65 ~ +150 : Operating temperature TOP -40 ~ +125 : Operating Voltage VOP +4.5 ~ +22 V Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 5 VIN 22V, 0.2A ILOAD 3A Efficiency VIN=12V, ILOAD=3A, VOUT=3V 74 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 5.5V VIN 22V Efficiency VIN=12V, ILOAD=3A 75 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 8V VIN 22V Efficiency VIN=12V, ILOAD=3A 80 % Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Output Feedback VFB 15V VIN 22V Efficiency VIN=16V, ILOAD=3A 89 %

G5E2596M Page: 3/6 ISSUED DATE :2005/12/26 REVISED DATE :2006/03/13B All Output Voltage Version Electrical Characteristics Specifications in boldface type are for full operating temperature range. The other type are for TJ=25 :. Parameter Symbol Conditions Min Typ Max Unit Feedback bias current IFB VFB=1.3V (adjustable version only) - -10 -50/-100 nA Oscillator frequency FOSC 127/110 150 173/173 kHz Oscillator frequency of short circuit protect FSCP When current limit occurred and VFB<0.5V, TA=25 :. 5 15 25 kHz Saturation voltage VSAT ILOAD=3A No outside circuit VFB=0V force drive on - 1.4 1.6/1.7 V Max. duty cycle (ON) VFB=0V force drive on - 100 - Max. duty cycle (OFF) DC VFB=12V force drive off - 0 - % Current limit ICL Peak current No outside circuit VFB=0V force drive on 3.6 4.5 5.5/6.5 A Output=0V, No outside circuit VFB=12V force drive off - - -200 uA Output leakage current IL Output=-1V, VIN=22V - -5 - mA Quiescent current IQ VFB=12V force drive off - 5 10 mA VIL Low (Regulator ON) - -

0.6 ON/OFF pin logic input

Threshold Voltage VIH High (Regulator OFF) 2.0 - - V ON/OFF pin Logic input current IH V LOGIC=2.5V ( Regulator OFF) - - -0.01 ON/OFF pin input current IL V LOGIC=0.5V ( Regulator ON) - -0.1 -1 uA Standby quiescent current ISTBY ON/OFF pin=5V, V IN=12V - 150 200 uA JC Junction to Case - 2.5 - Thermal Resistance JA Junction to Ambient with copper area of approximately 3 in2 - 28 - :/W Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version. ILOAD=0.5A Function Description The TO-220 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The G5E2596M junction temperature rises above ambient temperature with a 3A load and different input and output voltages. The data for these curves was taken with the G5E2596M operating as a buck-switching regulator in an ambient temperature of 25: (still air). These temperature rise numbers are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. 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 to this 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 rise numbers are all approximate, and there are many factors will affect these numbers. 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 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.

G5E2596M Page: 4/6 ISSUED DATE :2005/12/26 REVISED DATE :2006/03/13B Typical Application Circuit (1)Fixed Type Circuit (2)Adjustable Type Circuit (3)Delay Start Circuit

G5E2596M Page: 5/6 ISSUED DATE :2005/12/26 REVISED DATE :2006/03/13B Typical Performance Characteristics

G5E2596M Page: 6/6 ISSUED DATE :2005/12/26 REVISED DATE :2006/03/13B Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165