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CS8135
CS8135
5V, 5V Low Dropout Dual Regulator with RESET /ENABLE
Description
The CS8135 is a low dropout, high current, dual 5V linear regulator. The secondary 5V /10mA output is often used for powering systems with standby memory. Quiescent current drain is less than 3mA when supplying 10mA loads from the standby regulator. In automotive applications, the CS8135 and all regulated circuits are protected from reverse battery installations, as well as two-battery jumps. During line transients, such as a 60V load dump, the 500mA output will automatically shut down the primary output to protect both internal circuits and the load. The standby regulator will continue to power any standby load. The CS8135 is packaged in a 5 lead TO-220. NOTE: The CS8135 is compatible with the LM2935.
Features
s Two Regulated Outputs Primary Output 5V 5%; 500mA Secondary Standby 5V 5%; 10mA s Low Dropout Voltage (0.6V at 0.5A) s ON/OFF Control Option s Low Quiescent Drain (<3mA) s RESET Option s Protection Features Reverse Battery 60V Load Dump -50V Reverse Transient Short Circuit Thermal Shutdown Overvoltage Shutdown
Absolute Maximum Ratings Input Voltage Operating Range .....................................................................-0.5V to 26V Load Dump ............................................................................................60V Internal Power Dissipation ..................................................Internally Limited Junction Temperature Range (TJ)............................................-40C to +150C Storage Temperature Range ....................................................-65C to +150C Lead Temperature Soldering Wave Solder (through hole styles only)..........10 sec. max, 260C peak Electrostatic Discharge (Human Body Model) ..........................................2kV Block Diagram
Standby Output V IN + Output Current Limit V OUT2
Package Option
5 Lead TO-220
Tab (Gnd)
Bandgap Reference
Gnd Thermal Shutdown + + -
Primary Output
V OUT1
Over Voltage Shutdown Output Current Limit
RESET/ ENABLE
1
+ -
1 VIN 2 VOUT1 3 Gnd 4 RESET / ENABLE 5 VOUT2
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. 10/21/97
1
A
Company
CS8135
Electrical Characteristics : VIN = 14V, IOUT1 = 5mA, IOUT2 = 1mA, -40C TA 125C, -40C TJ 150C 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 6V VIN 26V, 5mA IOUT1 500mA IOUT = 500mA IOUT = 750mA 6V VIN 26V, IOUT1 = 5mA 5mA IOUT 500mA IOUT1 10mA, No Load on Standby IOUT1 = 500mA, No Load on Standby IOUT1 = 750mA, No Load on Standby f = 120Hz 0.75 VOUT1 5.5V VOUT1 -0.6V, 101/2 Load 1% Duty Cycle, t = 100ms, VOUT1 -6V, 101/2 Load 10Hz-100kHz 500mA DC and 10mA rms, 100Hz-10kHz 4.75 5.00 0.35 0.50 10 10 3 30 60 66 1.40 90 -50 -80 100 20 200 30 5.25 0.60 50 50 7 100 150 V V V mV mV mA mA mA dB A V V V Vrms mV/khr m1/2 V
Ripple Rejection Current Limit Maximum Line Transient Reverse Polarity Input Voltage, DC Reverse Polarity Input Voltage, Transient Output Noise Voltage Long Term Stability Output Impedance Overvoltage Shutdown s Standby Output (VOUT2) Output Voltage (VOUT2) Dropout Voltage Tracking Line Regulation Load Regulation Quiescent Current Ripple Rejection Current Limit Output Noise Voltage Long Term Stability Output Impedance s RESET Function RESET Output Voltage Low R1 = 20k1/2, VIN = 4.5V High R1 = 20k1/2, VIN = 14V RESET Output Current ON/OFF Resistor
6V VIN 26V, 1mA IOUT1 10mA IOUT2 = 10mA VOUT1-VOUT2 6V VIN 26V 1mA IOUT1 10mA IOUT 10mA, VOUT OFF f = 120Hz
4.75
5.00 0.3 50 4 10 2 66
5.25 0.7 200 50 50 3
V V mV mV mV mA dB mA V mV/khr 1/2
25 10Hz-100kHz 10mA DC and 1mA rms, 100Hz-10kHz
70 300 20 1
See Test & Application Circuit (page 6) VIN = 4.5V, RESET in Low State R1 (10% Tolerance)
4.5
0.8 5.0 5 20
1.1 6.0 30
V V mA k1/2
2
CS8135
Package Lead Description
PACKAGE LEAD # LEAD SYMBOL FUNCTION
TO-220 1 2 3 4 VIN VOUT1 Gnd RESET/ENABLE Supply voltage to IC, usually direct from battery. Regulated output voltage 5V, 500mA (typ) switched. Ground connection. CMOS compatible output lead, RESET goes low whenever VOUT1 becomes unregulated. To use the ENABLE option, connect the lead via a resistor to VIN (see app. notes). STANDBY output 5V, 10mA typ, always on.
5
VOUT2
Typical Performance Characteristics
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
1.0 0.9 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 200 400
OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V)
7 6 5 4 3 2 1 0 -1 -2 600 800 -40 -20 0 20 40 60
RL=500W
0.8
INPUT VOLTAGE (V)
Dropout Voltage vs. Output Current
1.0
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
Standby Output Voltage vs. Input Voltage
20
OUTPUT VOLTAGE DEVIATION (mV)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 5 10
OUTPUT CURRENT (mA)
10 0 -10 -20 3 2 1 0 0 10 20 30
IOUT1=500mA
INPUT VOLTAGE CHANGE (V)
15
20
40
50
60
TIME (ms)
Standby Dropout Voltage vs. Output Current
7 6
OUTPUT VOLTAGE (V)
Line Transient Response (VOUT1)
10 5 0 -5 -10
RL=10W
5 4 3 2 1 0 -1 -2 -40 -20 0 20 40 60
OUTPUT VOLTAGE DEVIATION (mV) INPUT VOLTAGE CHANGE (V)
3 2 1 0 0 10 20 30 40 50 60
INPUT VOLTAGE (V)
TIME (ms)
Output Voltage vs. Input Voltage
Line Transient Response (VOUT2)
3
CS8135
Typical Performance Characteristics: continued
150
OUTPUT VOLTAGE DEVIATION (mV)
5
SWITCH OPEN VO OFF
QUIESCENT CURRENT (mA)
100 50 0 -50 -100 -150 0.8 0.6 0.4 0.2 0 0 10 20 30 40 50 60 0 0 4 3 2 1
LOAD CURRENT (A)
5
10
15
20
25
TIME (ms)
STANDBY OUTPUT CURRENT (mA)
Load Transient Response (VOUT1)
Quiescent Current vs. Standby Output Current
150
STANDBY OUTPUT VOLTAGE DEVIATION (mV)
20 18
POWER DISSIPATION (W)
100 50 0 -50 -100 -150 20 15 10 5 0 0 10 20 30 40 50 60
16 14 12 10 8 6 4 2 0 0 10 20 30
INFINITE HEAT SINK
STANDBY LOAD CURRENT (mA)
10 C/W HEAT SINK
NO HEAT SINK
40
50
60
70
80
90
AMBIENT TEMPERATURE (C) TIME (ms)
Load Transient Response (VOUT2)
Maximum Power Dissipation (TO-220)
120
IOUT2=10mA
QUIESCENT CURRENT (mA)
100 80 60 40 20 0 0 200 400
OUTPUT CURRENT (mA)
600
800
Quiescent Current vs. Output Current
4
CS8135
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 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 Voltage 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. Current Limit Peak current that can be delivered to the output.
Typical Circuit Waveform
60V VIN 14V 31V 3V 26V 14V
SWITCH
OPEN
CLOSED 5V 2.4V
OPEN
5V 0V
5V
5V 0V
VOUT1
0V 5V
RESET VOUT2
0V 5V 5V 2.4V 5V
System Condition
Turn On
Load Dump
Low VIN
Line, Noise, Etc.
VOUT1 Short Circuit
Thermal Shutdown
Turn Off
*Reference Test & Application Circuit
Circuit Description
Standby Output
The CS8135 is equipped with two outputs. The second output is intended for use in systems requiring standby memory circuits. While the high current regulator output can be controlled with the RESET lead described below, the standby output remains on under all conditions as long as sufficient input voltage is applied to the IC. Thus, memory and other circuits powered by this output remain unaffected by positive line transients, thermal shutdown, etc. The standby regulator circuit is designed so that the quiescent current to the IC is very low (<3mA) when the other regulator output is off. 5
In applications where the standby output is not needed, it may be disabled by connecting a resistor from the standby output to the supply voltage. This eliminates the need for a capacitor on the output to prevent unwanted oscillations. The value of the resistor depends upon the minimum input voltage expected for a given system. Since the standby output is shunted with an internal diode zener, the current through the external resistor should be sufficient to bias VOUT2 up to this point. Approximately 60A will suffice, resulting in a 10k1/2 external resistor for most applications.
CS8135
Circuit Description: continued
VIN
RD 10kW VOUT2 VOUT2
output voltage of this lead is high (5V). This is set by an internal clamp. If the high current output becomes unregulated for any reason (line transients, short circuit, thermal shutdown, low input voltage, etc.) the lead switches to the active low state, and is capable of sinking several milliamps. This output signal can be used to initiate any reset or start-up procedure that may be required of the system. The RESET lead can also be driven directly from logic circuits. The only requirement is that the 20k1/2 pull-up resistor remain in place. This will not affect the logic gate since the voltage on this lead is limited by the internal clamp to 5V. The RESET signal is sacrificed in this arrangement since the maximum sink capability of the lead in the active low state (approximately 5mA), is usually not sufficient to pull down the active high logic gate. The flag can be retained if the driving gate is open collector logic.
VIN
+ C3
Disabling VOUT2 when it is not needed. C3 is no longer needed.
High Current Output
Unlike the standby regulated output, which must remain on whenever possible, the high current regulated output is fault protected against overvoltage and also incorporates thermal shutdown. If the input voltage rises above approximately 30V (e.g., load dump), this output will automatically shutdown. This protects the internal circuitry and enables the IC to survive higher voltage transients than would otherwise be expected. Thermal shutdown is effective against die overheating since the high current output is the dominant source of power dissipation in the IC. RESET Function The RESET function has the ability to serve a dual purpose if desired. When controlled in the manner shown in the test circuit (common in automotive systems where RESET /ENABLE is connected to the ignition switch), the lead also serves as an output flag that is active low whenever a fault condition is detected with the high current regulated output. Under normal operating conditions, the
R1 20kW
CS8135
RESET/ ENABLE
Controlling ON/OFF Terminal with a typical CMOS or TTL Logic Gate
R1 20kW
CS8135
RESET/ ENABLE
CMOS MM 74CO4 or Equivalent Delayed Reset Out
R2 100kW
Gnd 4.7 mF
Reset Pulse on Power-Up (with approximately 300ms delay)
Application Notes Test & Application Circuit 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 least expensive 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 output capacitor C2 shown in the test and applications circuit should work for most applications, however it is not necessarily the optimized solution. To determine acceptable values for C2 and C3 for a particular application, start with a tantalum capacitor of the rec6
S1 ON/OFF R1 20kW RESET FLAG
C1* 0.1 mF
VIN
VOUT1 + C2 ** 10mF
RESET/ ENABLE
CS8135
VOUT2 Gnd + C3** 10mF
NOTES: * C1 required if regulator is located far from power supply filter. ** C2, C3 required for stability.
CS8135
Application Notes: continued ommended 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 values 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 C2 will 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 and look for oscillations on the output. If no oscillations are observed, the capacitor is large enough to ensure a stable design under steady state conditions. 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, 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 capacitor should be less than 50% of the maximum allowable ESR found in step 3 above. Repeat steps 1 through 7 with the capacitor on the other output, C3. 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, 7 (1) VOUT2(min) is the minimum output voltage from VOUT2, 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 PD(max) is known, the maximum permissible value of RQJA can be calculated: RQJA = 150C - TA PD (2)
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.
IIN VIN
Smart Regulator
IOUT1 VOUT1 IOUT2
}
Control Features
VOUT2
IQ
Figure 1: Dual output regulator with key performance parameters labeled.
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 junction-to-case thermal resistance, RQCS = the case-to-heatsink thermal resistance, and RQSA = the heatsink-to-ambient 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.
CS8135
Package Specification
Package Dimensions in MM (Inches) 5 Lead TO-220 (T) Straight PACKAGE THERMAL DATA
Thermal Data RQJC typ RQJA
1.40 (.055) 1.14 (.045)
5 Lead TO-220 2.3 50
uC/W uC/W
typ
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)
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)
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)
0.81(.032)
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 CS8135YT5 CS8135YTVA5 CS8135YTHA5
Rev. 10/21/97
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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