TCL1117-2.85

800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V PRELIMINARY INFORMATION TCL1117 TCL1117 TCL1117-2.85 TCL1117-2.85 TCL1117-3.30 TCL1117-3.30 TCL1117-5.00 TCL1117-5.00 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V FEATURES s s s s s s s s Space-saving SOT-223 Package Pin Compatible with Older Adjustable 3 Terminal Regulators Adjustable or Fixed Voltages of 2.85V, 3.30V or 5.00V High Output Current ..................................... 800mA Low Dropout Voltage ............ 1.2V at IOUT = 800mA Guaranteed Dropout Voltage at Multiple Current Levels Line Regulation (Max) ...................................... 0.2% Load Regulation (Max) ..................................... 0.4% GENERAL DESCRIPTION The TCL1117 is a low-dropout positive voltage regulator (LDO) with 800mA output current capability. It is available in fixed and adjustable output voltage versions, 2.85V (active SCSI terminators), 3.30V and 5.00V. Output/reference voltage accuracy is guaranteed to ±1.0%. Over-current protection is integrated onto the chip. Dropout is specified at 1.2V maximum at full rated output current and less than 1.0V at low loads (30°C per second) must be minimized. Figure 3. Connections for Best Load Regulation Power Dissipation and Thermal Design As mentioned earlier, the TCL1117 has thermal overload protection which limits internal temperature to +165°C. However, device functionality is only guaranteed to a maximum junction temperature of +125°C. Since internal power dissipation can be >1 watt, careful thermal design is essential. The TCL1117 is supplied in a SOT-223 package which is intended to be directly surface-mounted to the PC-board. Because there is no dedicated heat sink, power dissipation to ambient is performed largely by the PC board and its copper material. The power dissipation and junction temperature for the TCL1117 in a SOT-223 are given by the following equations: PD = (VIN – VOUT) x (IOUT) TJUNCTION = TAMBIENT + (PD x ΘJA) NOTE: TJUNCTION must not exceed 125°C The ΘJC (junction to external tab) for the SOT-223 is 15°C/W. Depending upon heatsink parameters, the ΘCA can be as low as 30°C/W. Therefore, the total thermal resistance (ΘJA) is at least 45°C/W. Table 1 shows thermal resistance measurements taken with the TCL1117 mounted on 1/16 inch 2-layer PCB with 1oz. copper foil. NOTE: The TAB pin does not have to be soldered to all copper layers for effective heat transfer. Use Table 1 only as a rough guide since thermal interactions with adjacent components cannot be predicted. TCL1117-05 6/5/97 Ripple Rejection Ripple Rejection curves were generated using an adjustable output TCL1117 with a bypass capacitor from ADJ to ground. To obtain the performance shown in the curves, the impedance of the bypass capacitor (at the ripple frequency) should be less than R1. R1 is typically 100Ω to 200Ω. For example at 120Hz, with R1 = 100Ω, the adjust capacitor should be at least 13µF. Only 0.16µF would be required at 10kHz. The output ripple increases as the ratio of the output voltage to the reference voltage (VOUT/VREF) in fixed voltage devices, and adjustable devices without an adjust pin capacitor. For example, at 5V, output ripple will increase by a factor of 4 (5/1.25V). Ripple rejection will be reduced by 12db from the value shown on the curve. 4 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V PRELIMINARY INFORMATION TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 TYPICAL APPLICATIONS 1.2V-10V Adjustable Regulator 5V Regulator with Shutdown VIN IN TCL1117 ADJ OUT R1 121Ω + VOUT** VIN + 10µF 1k SHDN IN TCL1117 ADJ OUT 121Ω 1% + 365Ω 1% 5V + C1* 10µF R2 1k C2 100µF 2N3904 1k 100µF * NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS ** VOUT = 1.25V 1+ R2 R1 ( ) Remote Sensing Rp (MAX DROP 300mV) VIN IN TCL1117 ADJ OUT 100µF 25Ω + + 6 1 10µF 121Ω 8 VIN 7 OUTPUT 5V 2 RL – LM301A 4 1kΩ +3 5µF 365Ω 100pF + 25Ω RETURN RETURN Adjusting Output Voltage of Fixed Regulators Battery Charger IF VIN > 12V 10µF + IN TCL1117-5.00 OUT GND + 5V TO 10V 100µF VIN IN TCL1117 OUT RS R1 VOUT 1.25V ADJ 10µF* + 1k R2 VOUT – 1.25V IF = (1+ R2 ) R1 – RS (1+ R2 ) R1 1 – RS *OPTIONAL IMPROVES RIPPLE REJECTION IF = VOUT (1+ R2 ) R1 TCL1117-05 6/5/97 5 PRELIMINARY INFORMATION TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 TYPICAL APPLICATIONS (Cont.) 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V Battery Backed Up Regulated Supply Improving Ripple Rejection VIN 10µF + IN TCL1117-5.00 OUT GND 50Ω 5.2V LINE 5.0V BATTERY VIN 10µF + IN TCL1117 OUT ADJ R1 121Ω 1% VIN ≥ 16.5V 150µF R2 365Ω 1% + C1* 10µF SELECT FOR CHARGE RATE 6.5V 10µF + IN TCL1117-5.00 OUT GND *C1 IMPROVES RIPPLE REJECTION. XC SHOULD BE ≈ R1 AT RIPPLE FREQUENCY + 100µF High Efficiency Dual Supply FEEDBACK PATH MUR410 3.3V OUTPUT (TYPICAL) + 470µF MUR410 IN + + VIN MUR410 SWITCHING REGULATOR TCL1117-5.00 OUT GND +5V 0.5A 470µF + 10µF 1N4002 IN + TCL1117-5.00 OUT GND 470µF + 10µF 1N4002 –5V 0.5A Low Dropout Negative Supply VIN + IN TCL1117-5.00 OUT GND 10µF + 100µF VOUT = –5V FLOATING INPUT TCL1117-05 6/5/97 6 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V PRELIMINARY INFORMATION TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 TYPICAL CHARACTERISTICS Minimum Operating Current (Adjustable Device) 4 TJ = 25°C MINIMUM OPERATING CURRENT (mA) Dropout Voltage (VIN - VOUT) 1.4 1.2 DROPOUT VOLTAGE (V) 1.0 0.8 0.6 0.4 0.2 INDICATES GUARRANTEED TEST POINT 0.0 0 100 200 300 400 500 600 700 800 OUTPUT CURRENT (mA) TJ = 125°C 3 TJ = 125°C TJ = 25°C 2 TJ = –55°C 1 0 0 5 10 15 20 INPUT/OUTPUT DIFFERENTIAL (V) Short-Circuit Current 1.25 SHORT CIRCUIT CURRENT (A) Load Regulation 0.10 OUTPUT VOLTAGE DEVIATION (%) TJ = 125°C 1.00 TJ = 25°C 0.75 ∆ ILOAD = 800mA 0.05 0 -0.05 -0.10 -0.15 -0.20 0.50 0.25 0 0 5 10 15 INPUT/OUTPUT DIFFERENTIAL (V) -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) TCL1117 Ripple Rejection 100 90 RIPPLE REJECTION (dB) TCL1117 Ripple Rejection vs. Current 100 90 RIPPLE REJECTION (dB) VRIPPLE ≤ 3Vp-p VRIPPLE ≤ 0.5Vp-p 80 70 60 50 40 30 20 10 0 (VIN – VOUT) ≥ 3V CADJ = 200µF AT f < 60Hz CADJ = 25µF AT f > 60Hz IOUT = 0.5A 10 100 1k 10k 100k 80 70 60 50 40 30 20 10 0 0 VOUT = 5V CADJ = 25µF COUT = 25µF 0.2 0.4 fRIPPLE = 120kHz VRIPPLE ≤ 3Vp-p fRIPPLE = 20kHz VRIPPLE ≤ 0.5Vp-p 0.6 0.8 FREQUENCY (Hz) OUTPUT CURENT (A) TCL1117-05 6/5/97 7 PRELIMINARY INFORMATION TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V TYPICAL CHARACTERISTICS (Cont.) Temperature Stability 2.0 100 90 1.0 Adjust Pin Current OUTPUT VOLTAGE CHANGE (%) ADJUST PIN CURRENT (Aµ) 80 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 125 150 0 -1.0 -2.0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TCL1117-2.85 Load Transient Response OUTPUT VOLTAGE DEVIATION (V) 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (µsec) CIN = 10µF COUT = 10µF TANTALUM VIN = 4.25V PRELOAD = 0.1A TCL1117-5 Load Transient Response OUTPUT VOLTAGE DEVIATION (V) 0.3 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (µsec) CIN = 10µF COUT = 10µF TANTALUM VIN = 6.5V PRELOAD = 0.1A 0.3 LOAD CURRENT (A) TCL1117-2.85 Line Transient Response OUTPUT VOLTAGE DEVIATION (mV) 40 20 0 -20 -40 5.25 4.25 3.25 0 20 40 60 80 100 120 140 160 180 200 TIME (µsec) TCL1117-05 6/5/97 LOAD CURRENT (A) TCL1117-5 Line Transient Response OUTPUT VOLTAGE DEVIATION (mV) 60 40 20 0 -20 -40 7.50 6.50 5.50 0 20 40 60 80 100 120 140 160 180 200 TIME (µsec) CIN = 1µF COUT = 10µF TANTALUM IOUT = 0.1A 60 CIN = 1µF COUT = 10µF TANTALUM IOUT = 0.1A INPUT VOLTAGE (V) 8 INPUT VOLTAGE (V) 800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V PRELIMINARY INFORMATION TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 PACKAGE DIMENSIONS SOT-223 .264 (6.70) .248 (6.30) .122 (3.10) .114 (2.90) .287 (7.30) .146 (3.70) .264 (6.70) .130 (3.30) .041 (1.04) .033 (0.84) .090 (2.30) TYP. .031(0.80) .024 (0.60) .071 (1.80) MAX. .004 (0.10) .0008 (0.02) .181 (4.60) TYP. 10° MAX. .036 (0.91) MIN. .014 (0.35) .009 (0.24) .410 (10.41) .385 (9.78) .183 (4.65) .170 (4.32) DDPAK-3 .067 (1.70) .045 (1.14) 3° - 7° (5x) .055 (1.40) .045 (1.14) .370 (9.40) .329 (8.38) .605 (15.37) .549 (13.95) .010 (0.25) .000 (0.00) .051 (1.30) .049 (1.24) .037 (0.94) .026 (0.66) 0.26 (0.66) 0.14 (0.36) .110 (2.79) .068 (1.72) .100 (2.54) TYP. 0° - 8° Dimensions: inches (mm) Sales Offices TelCom Semiconductor 1300 Terra Bella Avenue P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: liter@c2smtp.telcom-semi.com TCL1117-05 6/5/97 TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 9 TelCom Semiconductor H.K. Ltd. 10 Sam Chuk Street, Ground Floor San Po Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957 Printed in the U.S.A.