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CS8156
CS8156
12V, 5V Low Dropout Dual Regulator with ENABLE
Description
The CS8156 is a low dropout 12V/5V dual output linear regulator. The 12V 5% output sources 750mA and the 5V 2.0% output sources 100mA. The on board ENABLE function controls the regulatorOs two outputs. When the ENABLE lead is low, the regulator is placed in SLEEP mode. Both outputs are disabled and the regulator draws only 200nA of quiescent current. The regulator is protected against overvoltage conditions. Both outputs are protected against short circuit and thermal runaway conditions. The CS8156 is packaged in a 5 lead TO220 with copper tab. The copper tab can be connected to a heat sink if necessary.
Features
s Two regulated outputs 12V 5.0%; 750mA 5V 2.0%; 100mA s Very low SLEEP mode current drain 200nA s Fault Protection Reverse Battery +60V, -50V Peak Transient Voltage Short Circuit Thermal Shutdown s CMOS Compatible ENABLE
Absolute Maximum Ratings Input Voltage Operating Range .....................................................................-0.5V to 26V Peak Transient Voltage (Load Dump = 46V) ....................................60V Internal Power Dissipation ..................................................Internally Limited Operating Temperature Range................................................-40C to +125C Junction Temperature Range...................................................-40C to +150C Storage Temperature Range ....................................................-65C to +150C Lead Temperature Soldering Wave Solder (through hole styles only)..........10 sec. max, 260C peak
Package Options
Block Diagram 5 Lead TO-220
VIN + Pre-Regulator Anti-Saturation and Current Limit VOUT2, 5V
Tab (Gnd)
ENABLE
+ -
VOUT1, 12V Gnd Bandgap Reference Over Voltage Shutdown + Anti-Saturation and Current Limit
1 VIN 2 3 4 5 VOUT1 Gnd ENABLE VOUT2
1
Thermal Shutdown
Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com
Rev. 2/19/98
1
A
Company
CS8156
Electrical Characteristics for VOUT: VIN = 14.5V, IOUT1 = 5mA, IOUT2 = 5mA, -40C TJ +150uC, -40C TC +125uC unless otherwise specified
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s Output Stage(VOUT1) Output Voltage, VOUT1 Dropout Voltage Line Regulation Load Regulation Quiescent Current Sleep Mode Ripple Rejection Current Limit Maximum Line Transient Reverse Polarity Input Voltage, DC Reverse Polarity Input Voltage, Transient Output Noise Voltage Output Impedance Over-voltage Shutdown s Standby Output (VOUT2) Output Voltage, (VOUT2) Dropout Voltage Line Regulation Load Regulation Quiescent Current Ripple Rejection Current Limit s ENABLE Function (ENABLE) Input ENABLE Threshold Input ENABLE Current VOUT1 Off VOUT1 On VENABLE VTHRESHOLD Package Lead Description
PACKAGE LEAD # LEAD SYMBOL FUNCTION
13V VIN 16V, IOUT1 750mA IOUT1 = 500mA IOUT1 = 750mA 13V VIN 16V ,5mA IOUT < 100mA 5mA IOUT1 500mA IOUT1 500mA, No Load on Standby IOUT1 750mA, No Load on Standby ENABLE = Low f = 120Hz, IOUT = 5mA, VIN = 1.5VPP at 15.5VDC VOUT1 13V VOUT1 -0.6V, 101/2 Load 1% Duty Cycle, t = 100ms, VOUT -6V, 101/2 Load 10Hz - 100kHz 500mA DC and 10mA rms, 100Hz
11.2
12.0 0.4 0.6 15 15 45 100 200
12.8 0.6 1.0 80 80 125 250
V V V mV mV mA mA nA dB
42 0.75 60 -18 -50
70 1.20 90 -30 -80 500 0.2 1.0 45 2.50
A V V V Vrms 1/2 V
28
34
9V VIN 16V, 1mA IOUT2 100mA IOUT2 100mA 6V VIN 26V; 1mA IOUT 100mA 1mA IOUT2 100mA; 9V VIN 16V VOUT1 OFF, VOUT2 OFF, VENABLE = 0.8V f = 120Hz; IOUT = 100mA, VIN = 1.5VPP at 14.5VDC
4.90
5.00 5 5 1
5.10 0.60 50 50 350
V V mV mV A dB mA
42 100
70 200
2.00 -10
1.25 1.25 0
0.80 10
V V A
5 Lead TO-220 1 2 3 4 5 VIN VOUT1 Gnd ENABLE VOUT2 Supply voltage, usually direct from battery. Regulated output 12V, 750mA (typ) Ground connection. CMOS compatible input lead; switches outputs on and off. When ENABLE is high VOUT1 and VOUT2 are active. Regulated output 5V, 100mA (typ). 2
CS8156
Typical Performance Characteristics
Dropout Voltage vs IOUT2
2000 1800 1600 Dropout Voltage (mV) OUTPUT VOLTAGE (V) 1400 1200 1000 800 600 400 200 0 0 50 100 150 200 IOUT (mA) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -40 -20 0 20 40 60 INPUT VOLTAGE (V) RL=10W
VOUT1 vs. Input Voltage
VOUT1 vs. Temperature
12.15 12.10 VOUT1 (V) 12.05
VOUT2 vs. Temperature
5.030 5.020 5.010 VOUT2 (V)
12.00 11.95 11.90 11.85 11.80 11.75 -40 -20 0 20 40 60 80 Temp (C) 100 120 140 160
5.000 4.990 4.980 4.970 -40
-20
0
20
40
60 80 Temp (C)
100 120 140 160
ENABLE Current vs. ENABLE Voltage
5.0 100
ENABLE Current vs. ENABLE Voltage
I ENABLE (mA) 0 1 2 3 4 5
80 IENABLE (mA)
4.0
60
3.0
40
2.0
20
1.0 0.0 0.0
0
5
10
15
20
25
VENABLE (V)
VENABLE (V)
3
CS8156
Typical Performance Characteristics: continued
Line Transient Response (VOUT1) Line Transient Response (VOUT2)
20
OUTPUT VOLTAGE DEVIATION (mV)
IOUT1 = 500mA
OUTPUT VOLTAGE DEVIATION (mV)
10 0 -10 -20 3 2 1 0 0 10 20
TIME (ms)
10 5 0 -5 -10
IOUT2 = 100mA
INPUT VOLTAGE CHANGE (V)
INPUT VOLTAGE CHANGE (V)
3 2 1 0 0 10 20
TIME (ms)
30
40
50
60
30
40
50
60
Load Transient Response (VOUT1)
Load Transient Response (VOUT2)
150
OUTPUT VOLTAGE DEVIATION (mV)
150
STANDBY OUTPUT VOLTAGE DEVIATION (mV)
100 50 0 -50 -100 -150 0.8 0.6 0.4 0.2 0 0 10 20
TIME (ms)
100 50 0 -50 -100 -150 20 15 10 5 0 0 10 20
TIME (ms)
30
40
50
60
STANDBY LOAD CURRENT (mA)
LOAD CURRENT (A)
30
40
50
60
Maximum Power Dissipation (TO-220)
Quiescent Current vs Output Current for VOUT2
150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 No Load on 5V
20 18
POWER DISSIPATION (W) INFINITE HEAT SINK
Quiescent Current (mA)
16 14 12 10 8 6 4 2 0 0 10 20 30
VIN = 14V
125uC 25uC -40uC
10C/W HEAT SINK
NO HEAT SINK
40
50
60 70
80 90
0
100
200
300
400
500
600
700
800
Output Current (mA)
AMBIENT TEMPERATURE (C)
4
CS8156
Typical Performance Characteristics: continued
Quiescent Current vs Output Current for VOUT1
22 20 18 Quiescent Current (mA) 14 12 10 8 6 4 2 0 125uC 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Output Current (mA) -40uC 25uC VIN = 14V Line Regulation (mV) 16 1 0 -1 -2 -3 -4 -5 -6 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Output Current (mA) VIN = 6 - 26V 125uC -40uC 25uC No Load On 12V 3 2
Line Regulation vs Output Current for VOUT2
Load Regulation vs Output Current for VOUT2
0 -2 Load Regulation (mV) -4 -6 -8 -10 -12 -14 -16 -18 VIN = 14V 125uC 25uC Line Regulation (mV) -40uC 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40
Line Regulation vs Output Current for VOUT1
VIN = 13 - 26V
125uC
25uC
-40uC
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Output Current (mA)
0
100
100
100 100 100 100 Output Current (mA)
100
800
Load Regulation vs Output Current for VOUT1
0 -5 -40uC Load Regulation (mV) -10 25uC -15 125uC -20 -25 -30 -35 -40 0 100 200 300 400 500 600 Output Current (mA) 700 800 VIN = 14V
5
CS8156
Definition of Terms
Dropout Voltage The input-output voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal value obtained at 14V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage The DC voltage applied to the input terminals with respect to ground. Input Output Differential The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will operate. Line Regulation The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. Load Regulation The change in output voltage for a change in load current at constant chip temperature. Long Term Stability Output voltage stability under accelerated life-test conditions after 1000 hours with maximum rated voltage and junction temperature. Output Noise Voltages The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Quiescent Current The part of the positive input current that does not contribute to the positive load current. i.e., the regulator ground lead current. Ripple Rejection The ratio of the peak-to-peak input ripple voltage to the peak-to-peak output ripple voltage. Temperature Stability of VOUT The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme.
Typical Circuit Waveform
60V VIN 14V 31V 3V 26V 14V
ENABLE
2.0V 0.8V 12V 12V 2.4V 12V 0V 0V 5V 2.4V 5V 12V 12V 0V
VOUT1
VOUT2 System Condition
0V Turn On Load Dump Line Noise, Etc. VOUT1 Short Circuit VOUT 1 Thermal Shutdown Turn Off
Low VIN
VOUT2 Short Circuit
Application Notes Stability Considerations The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up delay, load transient response and loop stability. The capacitor value and type should be based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR can cause instability. The aluminum electrolytic capacitor is the cheapest solution, but, if the circuit operates at low temperatures (-25C to -40C), both the value and ESR of the capacitor will vary considerably. The capacitor manufacturers data sheet usually provides this information. The value for the output capacitors C2 and C3 shown in the test and applications circuit should work for most applications, however it is not necessarily the best solution. 6 To determine acceptable values for C2 and C3 for a particular application, start with a tantalum capacitor of the recommended value and work towards a less expensive alternative part for each output. Step 1: Place the completed circuit with the tantalum capacitors of the recommended value in an environmental chamber at the lowest specified operating temperature and monitor the outputs with an oscilloscope. A decade box connected in series with capacitor C2will simulate the higher ESR of an aluminum capacitor. Leave the decade box outside the chamber, the small resistance added by the longer leads is negligible. Step 2: With the input voltage at its maximum value, increase the load current slowly from zero to full load on the output under observation. Look for any oscillations on the output. If no oscillations are observed, the capacitor is large enough to ensure a stable design under steady state conditions.
CS8156
Application Notes Step 3: Increase the ESR of the capacitor from zero using the decade box and vary the load current until oscillations appear. Record the values of load current and ESR that cause the greatest oscillation. This represents the worst case load conditions for the output at low temperature. Step 4: Maintain the worst case load conditions set in step 3 and vary the input voltage until the oscillations increase. This point represents the worst case input voltage conditions. Step 5: If the capacitor is adequate, repeat steps 3 and 4 with the next smaller valued capacitor. A smaller capacitor will usually cost less and occupy less board space. If the output oscillates within the range of expected operating conditions, repeat steps 3 and 4 with the next larger standard capacitor value. Step 6: Test the load transient response by switching in various loads at several frequencies to simulate its real working environment. Vary the ESR to reduce ringing. Step 7: Remove the unit from the environmental chamber and heat the IC with a heat gun. Vary the load current as instructed in step 5 to test for any oscillations. Once the minimum capacitor value with the maximum ESR is found for each output, a safety factor should be added to allow for the tolerance of the capacitor and any variations in regulator performance. Most good quality aluminum electrolytic capacitors have a tolerance of +/20% so the minimum value found should be increased by at least 50% to allow for this tolerance plus the variation which will occur at low temperatures. The ESR of the capacitors should be less than 50% of the maximum allowable ESR found in step 3 above. Repeat steps 1 through 7 with C3, the capacitor on the other output. Calculating Power Dissipation in a Dual Output Linear Regulator The maximum power dissipation for a dual output regulator (Figure 1) is: PD(max) = {VIN(max)VOUT1(min)}IOUT1(max)+ {VIN(max)VOUT2(min)}IOUT2(max)+VIN(max)IQ Where: VIN(max) is the maximum input voltage, VOUT1(min) is the minimum output voltage from VOUT1, VOUT2(min) is the minimum output voltage fromVOUT2, IOUT1(max) is the maximum output current for the application, IOUT2(max) is the maximum output current for the application, and IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of P D(max) is known, the maximum permissible value of RQJA can be calculated: RQJA = 150C - TA PD (2)
NOTES: * C1 required if regulator is located far from power supply filter. ** C2, C3 required for stability.
IIN VIN
Smart Regulator
IOUT1 VOUT1 IOUT2
}
Control Features
VOUT2
IQ
Figure 1: Dual output regulator with key performance parameters labeled.
The value of RQJA can then be compared with those in the package section of the data sheet. Those packages with RQJA's less than the calculated value in equation 2 will keep the die temperature below 150C. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heatsink will be required. Heat Sinks A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RQJA: RQJA = RQJC + RQCS + RQSA (3) where RQJC = the junctiontocase thermal resistance, RQCS = the casetoheatsink thermal resistance, and RQSA = the heatsinktoambient thermal resistance. RQJC appears in the package section of the data sheet. Like RQJA, it too is a function of package type. RQCS and RQSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers. Test & Application Circuit
(1)
C1* 0.1mF
VIN
VOUT1
+
CS8156
ENABLE
C2** 22mF
Gnd
VOUT2
+
C3** 22mF
7
CS8156
Package Specification
PACKAGE DIMENSIONS IN mm(INCHES) PACKAGE THERMAL DATA
5 Lead TO-220 (T) Straight
Thermal Data RQJC typ RQJA typ
5 Lead TO-220 2.0 50
uC/W uC/W
10.54 (.415) 9.78 (.385) 2.87 (.113) 6.55 (.258) 2.62 (.103) 5.94 (.234)
4.83 (.190) 4.06 (.160) 3.96 (.156) 3.71 (.146)
1.40 (.055) 1.14 (.045)
5 Lead TO-220 (THA) Horizontal
4.83 (.190) 10.54 (.415) 9.78 (.385) 1.40 (.055) 3.96 (.156) 3.71 (.146) 1.14 (.045) 4.06 (.160)
14.99 (.590) 14.22 (.560)
2.87 (.113) 2.62 (.103)
6.55 (.258) 5.94 (.234)
14.99 (.590) 14.22 (.560)
14.22 (.560) 13.72 (.540)
2.77 (.109) 6.83 (.269)
1.02 (.040) 0.76 (.030)
0.81(.032) 1.68 (.066) TYP 1.70 (.067) 6.81(.268) 0.56 (.022) 0.36 (.014) 6.60 (.260) 5.84 (.230) 2.92 (.115) 2.29 (.090)
1.02(.040) 0.63(.025) 6.93(.273) 6.68(.263)
1.83(.072) 1.57(.062)
0.56 (.022) 0.36 (.014) 2.92 (.115) 2.29 (.090)
5 Lead TO-220 (TVA) Vertical
4.83 (.190) 4.06 (.160) 10.54 (.415) 9.78 (.385) 3.96 (.156) 3.71 (.146)
1.40 (.055) 1.14 (.045)
6.55 (.258) 5.94 (.234) 2.87 (.113) 2.62 (.103) 14.99 (.590) 14.22 (.560)
1.78 (.070) 2.92 (.115) 2.29 (.090) 8.64 (.340) 7.87 (.310) 0.56 (.022) 0.36 (.014)
4.34 (.171) 7.51 (.296) 1.68 (.066) typ 6.80 (.268)
1.70 (.067)
.94 (.037) .69 (.027)
Ordering Information
Part Number CS8156YT5 CS8156YTVA5 CS8156YTHA5
Rev. 2/19/98
Description 5 Lead TO-220 Straight 5 Lead TO-220 Vertical 5 Lead TO-220 Horizontal 8
Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information.
(c) 1999 Cherry Semiconductor Corporation

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