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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 (<100mA). The SOT-223 package makes the TCL1117 especially attractive for tight physical layouts. For stability, a 10F output capacitor is required. The TCL1117 is an NPN-based design which has significantly lower unused quiescent current than similar PNP-based regulators. PIN CONFIGURATIONS SOT-223 3-Lead Package
FRONT VIEW
APPLICATIONS
s s s s s Active SCSI Terminators High Efficiency Linear Regulators Post Regulators for Switching Supplies Battery Chargers 5V - 3.3V Linear Regulators
DDPAK-3
FRONT VIEW
ORDERING INFORMATION
Part Number* TCL1117-ADJCDB TCL1117-2.85CDB TCL1117-3.30CDB TCL1117-5.00CDB TCL1117-ADJCEB TCL1117-2.85CEB TCL1117-3.30CEB TCL1117-5.00CEB Package SOT-223-3 SOT-223-3 SOT-223-3 SOT-223-3 DDPAK-3 DDPAK-3 DDPAK-3 DDPAK-3 Part Marking 1117 11172 11173 11175
IN
TAB IS VOUT
3 2
OUT 1 2 3
1
ADJ/GND
ADJ/GND
OUT
*Ambient temperature range is determined by maximum operating power dissipation and a maximum die temperature of 125C (see Power Dissipation and Thermal Design Section).
TYPICAL APPLICATION
110 IN
TCL1117-5.00 OUT
GND
110 110
18 to 27 LINES
4.75V to 5.25V
10F
22F
Active Terminator for SCSI-2 Bus
TCL1117-05 6/5/97
1 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
IN
PRELIMINARY INFORMATION
TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00
ABSOLUTE MAXIMUM RATINGS*
800mA LOW DROPOUT POSITIVE REGULATORS ADJUSTABLE AND FIXED 2.85V, 3.30V, 5.00V
Input Voltage Operating Voltage: TCL1117, TCL1117-3.30, TCL1117-5.00 ...... 15V TCL1117-2.85 ................................................10V Surge Voltage: TCL1117, TCL1117-3.30, TCL1117-5.00 ...... 20V Operating Junction Temperature ............... 0C to +125C
Storage Temperature ............................ - 65C to +150C Lead Temperature (Soldering 10 sec) .................... 300C
*Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Symbol Parameter
Reference Voltage Output Voltage TCL1117 TCL1117-2.85
Test Conditions
IOUT = 10mA, (VIN - VOUT) = 2V, TJ = 25C 10 IOUT 800mA, 1.4V (VIN - VOUT) 10V (Note 1) IOUT = 10mA, VIN = 4.85V, TJ = 25C 0 IOUT 800mA, 4.25V VIN 10V (Note 1) 0 IOUT 500mA, VIN = 3.95V (Note 1) IOUT = 10mA, VIN = 5.3V, TJ = 25C 0 IOUT 800mA, 4.75V VIN 10V (Note 1) IOUT = 10mA, VIN = 7V, TJ = 25C 0 IOUT 800mA, 6.50V VIN 12V (Note 1) IOUT = 10mA, 1.5V VIN - VOUT 15V (Notes 1 & 2) IOUT = 0mA, 4.25V VIN 10V (Notes 1 & 2) IOUT = 0mA, 4.75V VIN 15V (Notes 1 & 2) IOUT = 0mA, 6.5V VIN 15V (Notes 1 & 2) (VIN - VOUT) = 3V, 10mA, IOUT 800mA (Notes 1 & 2) VIN = 4.25V, 0 IOUT 800mA (Notes 1 & 2) VIN = 4.75V, 0 IOUT 800mA (Notes 1 & 2) VIN = 6.5V, 0 IOUT 800mA (Notes 1 & 2) IOUT = 100mA, (Note 1 & 3) IOUT = 500mA, (Note 1 & 3) IOUT = 800mA, (Note 1 & 3) (VIN - VOUT) = 5V, TJ = 25C (VIN - VOUT) = 15V (Note 1 & 4) VIN 10V (Note 1) VIN 15V (Note 1) VIN 15V (Note 1) TA = 25C, 30msec Pulse fRIPPLE = 120Hz (VIN - VOUT) = 3V, VRIPPLE = 1Vp-p ( Note 1) (Note 1) 10mA IOUT 800mA, 1.4V (VIN - VOUT) 10V (Note 1) TA = 125C, 1000 Hrs. (% of VOUT), 10Hz f 10kHz (Junction to Case, at Tab)
Min
1.238 1.225 2.820 2.790 2.790 3.265 3.230 4.950 4.900 -- -- -- -- -- -- -- -- -- -- -- 800 -- -- -- -- -- 60 -- -- -- -- -- --
Typ
1.250 1.250 2.850 2.850 2.850 3.300 3.300 5.000 5.000 0.035 1 1 1 0.1 1 1 1 1.00 1.05 1.10 950 1.7 5 5 5 0.01 75 55 0.2 0.5 0.3 0.003 15
Max
1.262 1.270 2.880 2.910 2.910 3.335 3.370 5.050 5.100 0.2 6 7 10 0.4 10 12 15 1.10 1.15 1.20 1200 5 10 10 10 0.1 -- 120 5 -- -- -- --
Unit
V V
TCL1117-3.30 TCL1117-5.00 Line Regulation TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 TCL1117 TCL1117-2.85 TCL1117-3.30 TCL1117-5.00
V V % mV
Load Regulation
% mV
Dropout Voltage
V
Current Limit Minimum Load Current Quiescent Current
TCL1117
mA mA mA
TCL1117-2.85 TCL1117-3.30 TCL1117-5.00 Thermal Regulation Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise Thermal Resistance
%W dB A A % % % C/W
NOTES: 1. Specifications apply over the full operating temperature range. 2. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 3. Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve. 4. Minimum load current is defined as the minimum output current required to maintain regulation.
TCL1117-05 6/5/97
2
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
APPLICATIONS Overload Protection
The TCL1117 is protected against current (short-circuit) and thermal overload conditions. Thermal protection is triggered by a chip temperature exceeding 165C. Current overload is triggered at approximately 950mA.
currents can be high enough to damage the chip. In this case, a high-current, fast-response diode is recommended. (See Figure 1).
Output Voltage Adjust
Like most LDOs, the TCL1117 regulates the output by comparing the output voltage, or a multiple thereof, to an internally generated reference voltage. On the adjustable version, the VREF is available externally as 1.25V (1%) between VOUT and ADJ (See Figure 2). The voltage divider formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation: VOUT = VREF R2 (1+ R1)+ I
ADJ
Stability and Load Regulation
The TCL1117 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10F tantalum or 50F aluminum electrolytic is sufficient. NOTE: It is important that the ESR for this capacitor does not exceed 0.5. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator designs. NOTE: See Protection Diodes for limitations. Another benefit of larger output capacitance is improved transient load response (large di/dt in the load).
R2
On fixed voltage versions of the TCL1117, the voltage divider is provided internally.
Load Regulation
The TCL1117 load regulation is limited by the resistance of the wire connecting it to the load (Rp, Figure 3). For the adjustable version, the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the TCL1117, NOT to the high side of the load (Figure 3). When so connected, Rp is not multiplied by the divider ratio. For the fixed output versions, the top of R1 is internally connected to the output and the ground pin can be connected to the low side of the load as a negative side sense if, so desired.
Protection Diodes
Typically no protection diodes are necessary for the TCL1117. Unlike older regulators, the ADJ pin is protected internally from excessive currents. The ADJ pin can be driven with voltage transients as high as 25V with respect to the output without damage to the device. Likewise, a diode between the input and output is not typically required. If the input voltage collapses the internal circuitry can absorb ~20A transient currents (<10sec) without damage. This reverse current is much larger than most power supply designs can generate. However, if the output capacitor is VERY large (>1000F), instantaneous
D1 1N4002 (OPTIONAL)
VIN
VIN IN TCL1117 ADJ R1 OUT VOUT
IN
TCL1117 ADJ IADJ 50A
OUT VREF R1
VOUT
+
COUT 150F
+
VOUT = VREF 1+ R2 R1
CADJ 10F R2
(
) + IADJ R2
R2
Figure 1.
TCL1117-05 6/5/97
Figure 2. Basic Adjustable Regulator 3
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
Table 1.
Rp PARASITIC LINE RESISTANCE VIN IN TCL1117 ADJ OUT
Copper Area Topside*
2500 Sq. mm 1000 Sq. mm
Thermal Resistance
Backside Board Area (Junction-to-Ambient)
2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 1000 Sq. mm 0 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 1000 Sq. mm 1000 Sq. mm 45C/W 45C/W 53C/W 59C/W 52C/W 55C/W
R1 CONNECT R1 TO CASE R2
RL
225 Sq. mm 100 Sq. mm 1000 Sq. mm 1000 Sq. mm
*Tab of device attached to topside copper
CONNECT R2 TO LOAD
Soldering Methods
The recommended methods of soldering the SOT-223 package are: vapor phase re-flow and infrared re-flow with component preheat within 65C of the solder temperature. Hand soldering and wave soldering methods are not recommended since they can damage the part with excessive thermal gradients across the surface area of the package. Thermal shock to the package (>30C 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 +165C. However, device functionality is only guaranteed to a maximum junction temperature of +125C. 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 JA) NOTE: TJUNCTION must not exceed 125C The JC (junction to external tab) for the SOT-223 is 15C/W. Depending upon heatsink parameters, the CA can be as low as 30C/W. Therefore, the total thermal resistance (JA) is at least 45C/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 100 to 200. For example at 120Hz, with R1 = 100, the adjust capacitor should be at least 13F. Only 0.16F 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 121 +
VOUT**
VIN + 10F
IN
TCL1117 ADJ
OUT 121 1% + 365 1%
5V
+
C1* 10F R2 1k
C2 100F
1k SHDN 1k 2N3904
100F
* 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 100F 25 + + 6 1 10F 121 8 VIN 7 OUTPUT 5V 2 RL
-
LM301A 4
1k +3
5F 365 100pF + RETURN 25 RETURN
Adjusting Output Voltage of Fixed Regulators
Battery Charger
IF
VIN > 12V 10F +
IN TCL1117-5.00 OUT GND +
5V TO 10V 100F
VIN
IN
TCL1117
OUT RS R1
VOUT
1.25V ADJ
10F*
+
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 10F +
IN TCL1117-5.00 OUT GND
5.2V LINE 5.0V BATTERY
VIN 10F +
IN
TCL1117 OUT ADJ R1 121 1%
VIN 16.5V
150F 50 SELECT FOR CHARGE RATE *C1 IMPROVES RIPPLE REJECTION. XC SHOULD BE R1 AT RIPPLE FREQUENCY + 100F R2 365 1% + C1* 10F
+ 6.5V 10F
IN TCL1117-5.00 OUT GND
High Efficiency Dual Supply
FEEDBACK PATH MUR410 3.3V OUTPUT (TYPICAL)
+
470F
MUR410 IN
+
+ VIN MUR410 SWITCHING REGULATOR
TCL1117-5.00 OUT GND
+5V 0.5A
+
470F
10F
1N4002
IN
+
TCL1117-5.00 OUT GND
470F
+
10F
1N4002 -5V 0.5A
Low Dropout Negative Supply
VIN
+
IN TCL1117-5.00 OUT GND 10F
+
100F 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
MINIMUM OPERATING CURRENT (mA)
Dropout Voltage (VIN - VOUT)
1.4 1.2
DROPOUT VOLTAGE (V)
TJ = 25C 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 = 125C
3
TJ = 125C TJ = 25C
2
TJ = -55C 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 = 125C 1.00 TJ = 25C 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 = 200F AT f < 60Hz CADJ = 25F AT f > 60Hz IOUT = 0.5A 10 100 1k 10k 100k
80 70 60 50 40 30 20 10 0 0 VOUT = 5V CADJ = 25F COUT = 25F 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 (A)
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 (sec) CIN = 10F COUT = 10F 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 (sec) CIN = 10F COUT = 10F 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 (sec)
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 (sec) CIN = 1F COUT = 10F TANTALUM IOUT = 0.1A
60
CIN = 1F COUT = 10F 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.

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