G5ELM2576 GTM
Document overview
- Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
Features
&3.3V, 5.0V, 12V, 15V and adjustable output versions &Adjustable version output voltage range , 1.23V to 37V D˙% max over line and load conditions &Guaranteed 3A output current &Wide input voltage range &Efficient pre-regulator for linear regulators &Requires only 4 external components &52kHz fixed frequency oscillator &TTL shutdown capability, low power standby mode &High efficiency &Uses readily available standard inductors &Thermal shutdown and current limit protection
Applications
&Simple high-efficiency step-down (buck) regulator &On-card switching regulators &Positive to negative converter (Buck-Boost) 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 Typical Application (Fixed Output Voltage Version) G5ELM2576-5.0
G5ELM2576 Page: 2/7 ISSUED DATE :2005/04/15 REVISED DATE : Block Diagram Absolute Maximum Ratings (Note1) Parameter Ratings Unit Maximum Supply Voltage 45 V ON/OFF pin input Voltage -0.3 V +VIN V Output Voltage to ground (steady state) -1 V Power dissipation Internally Limited Storage Temperature -65 ~ +150 : Maximum junction temperature +150 : Minimum ESD rating (C=100pF, R=1.5k) 2k V Lead temperature (soldering, 10seconds) +260 : Operating Ratings Parameter Ratings Unit Temperature range -40 TJ +125 : Supply Voltage 40 V G5ELM2576-3.3 Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A Circuit of Figure 2 3.234 3.3 3.366 V Output Voltage VOUT 6V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A 75 % G5ELM2576-5.0 Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A Circuit of Figure 2 4.9 5.0 5.1 V Output Voltage VOUT 8V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A 77 % 3.3V, R2=17k 5.0V, R2=3.1k 12V, R2=8.84k 15V, R2=11.3k For Adjustable version, R1=open, R2=0
G5ELM2576 Page: 3/7 ISSUED DATE :2005/04/15 REVISED DATE : Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=25V, ILOAD=0.5A Circuit of Figure 2 11.76 12 12.24 V Output Voltage VOUT 15V VIN 40V, 0.5A ILOAD 3A Circuit of Figure 2 11.52/11.40 12 12.48/12.60 V Efficiency VIN=15V, ILOAD=3A 88 % Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=25V, ILOAD=0.5A Circuit of Figure 2 14.70 15 15.30 V Output Voltage VOUT 18V VIN 40V, 0.5A ILOAD 3A Circuit of Figure 2 14.40/14.25 15 15.60/15.75 V Efficiency VIN=18V, ILOAD=3A 88 % Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A, VOUT=5V Circuit of Figure 2 1.217 1.230 1.243 V Output Voltage VOUT 8V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A, VOUT=5V 77 % All Output Voltage Version Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V, 5.0V and Adjustable versions, VIN=25V for 12V version, and VIN=30V for 15V version. ILOAD=0.5A Parameter Symbol Conditions Min Typ Max Unit Feedback bias current Ib VOUT=5V (adjustable version only) - 50 100/500 nA Oscillator frequency fO (Note 8) 47/42 52 58/63 kHz Saturation voltage VSAT ILOAD=3A (Note 4) - 1.4 1.8/2.0 V Maximum duty cycle (ON) DC (Note 5) 93 98 % Output leakage current IL (Note 6, 7) Output=0V Output=-1V 7.5 30 mA Quiescent current IQ (Note 6) - 5 10 mA Standby quiescent current ISTBY ON/OFF pin=5V (OFF) - 50 200 uA ON/OFF Control VIH VOUT=0V 2.2/2.4 1.4 - ON/OFF pin logic input level VIL VOUT=Nominal output voltage - 1.2 1.0/0.8 V IIH ON/OFF pin=5V (OFF) - 12 30 ON/OFF pin input current IIL ON/OFF pin=0V (ON) - 0 10 uA
G5ELM2576 Page: 4/7 ISSUED DATE :2005/04/15 REVISED DATE : Note 1: Absolute Maximum Rating indicate limits beyond which damage to the device may occur. Operating Rating indicate conditions for which the device is intended to be functional, but do not guaranteed specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). Note 3: External component such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the G5ELM2576 is used as shutdown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output. Note 5: Feedback pin removed from output and connected to 0V. Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V and 5V versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. Note 7: VIN=40V. Note 8: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. Typical Performance Characteristics (circuit of Figure 2) Normalized Output Voltage Line Regulator Dropout Voltage Standby Quiescent Current
G5ELM2576 Page: 5/7 ISSUED DATE :2005/04/15 REVISED DATE : Quiescent Current Current Limit Switch Saturation Voltage Efficiency Oscillator Frequency Minimum Operating voltage
G5ELM2576 Page: 6/7 ISSUED DATE :2005/04/15 REVISED DATE : Quiescent Current vs Duty Cycle Feedback Voltage vs Duty Cycle Minimum Power Dissipation Feedback Pin Current Switching Waveforms Load Transient Response Output Voltage Change Load Current VOUT=15V A: Output Pin Voltage, 50V/div B: Output Pin Current, 2A/div C: Inductor Current, 2A/div D: Output Ripple Voltage, 50mV/div AC Coupled Horizontal Time Base: 5us/div
G5ELM2576 Page: 7/7 ISSUED DATE :2005/04/15 REVISED DATE : Test Circuit and layout Guidelines As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short. 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 G5ELM2576 Cin-- 100uF, 75V, Aluminum Electrolytic Cout-- 1000uF, 25V Aluminum Electrolytic D1-- Schottky, MBR360 L1-- 100uH, Pulse Eng, PE92108 R1-- 2k, 0.1% R1-- 6.12k, 0.1% Vout=VREF*(1+R2/R1) R2=R1*(Vout/VREF-1) Where VREF=1.23V, R1 between 1k and 5k Figure 2 G5ELM2576