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CS8361
CS8361
5V Dual Micropower Low Dropout Regulator with ENABLE and RESET
Description
The CS8361 is a precision micropower dual voltage regulator with ENABLE and RESET . The 5V standby output is accurate within 2% while supplying loads of 100mA and has a typical dropout voltage of 400mV. Quiescent current is low, typically 140A with a 300A load. The active RESET output monitors the 5V standby output and holds the RESET line low during powerup and regulator dropout conditions. The RESET circuit includes hysteresis and is guaranteed to operate correctly with 1V on the standby output. The second output tracks the 5V standby output through an external adjust lead, and can supply loads of 250mA with a typical dropout voltage of 400mV. The logic level ENABLE lead is used to control this tracking regulator output. Both outputs are protected against overvoltage, short circuit, reverse battery and overtemperature conditions. The robustness and low quiescent current of the CS8361 makes it not only well suited for automotive microprocessor applications, but for any battery powered microprocessor applications.
Features
s 2 Regulated Outputs Standby Output 5V 2%; 100mA Tracking Output 5V; 250mA s Low Dropout Voltage (0.4V at rated current) s RESET Option s ENABLE Option s Low Quiescent Current s Protection Features Independent Thermal Shutdown Short Circuit 60V Load Dump Reverse Battery
Block Diagram
VIN Overvoltage Shutdown OVSD Current Limit + - TSD VIN Current Limit Thermal Shutdown TSD - OVSD Bandgap RESET BG BG
VSTBY 5V,100mA,2%
Package Options
16 Lead PDIP & SOIC Wide (internally fused leads)
VIN NC VTRK Gnd Gnd Adj
1
VSTBY NC NC Gnd Gnd NC NC RESET
VTRK 250mA
NC ENABLE
7L TO-220
Adj +
7L D2PAK
VSTANDBY ENABLE - + BG + Gnd RESET - RESET TSD OVSD
1. VSTBY 2. VIN 3. VTRK 4. Gnd 5. Adj 6. ENABLE 7. RESET
1
1
Also available in 20 Lead SOIC Wide. Consult factory for 20 Lead PSOP .
* Consult factory for positive ENABLE option. 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. 5/4/99
1
A
(R)
Company
CS8361
Absolute Maximum Ratings Supply Voltage, VIN .....................................................................................................................................................-16V to 26V Positive Transient Input Voltage, tr > 1ms.............................................................................................................................60V Negative Transient Input Voltage, T < 100ms, 1% Duty Cycle..........................................................................................-50V Input Voltage Range ( ENABLE , RESET ) ...............................................................................................................-0.3V to 10V Junction Temperature...........................................................................................................................................-40C to +150C Storage Temperature Range ................................................................................................................................-55C to +150C ESD Susceptibility (Human Body Model)..............................................................................................................................2kV Lead Temperature Soldering Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260C peak Reflow (SMD styles only) ......................................................................................60 sec. max above 183C, 230C peak
Electrical Characteristics: 6V VIN 26V, IOUT1 = IOUT2 = 100A, -40C TA +125C, -40C TJ +150C,
unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s Tracking Output (VTRK) VSTBY VTRK, VTRK Tracking Error Adjust Pin Current, IAdj Line Regulation Load Regulation Dropout Voltage (VIN VTRK) Current Limit Quiescent Current Reverse Current Ripple Rejection 6V VIN 26V 100A ITRK 250mA (note 1) Loop in Regulation 6V VIN 26V (note 1) 100A ITRK 250mA (note 1) ITRK = 100A ITRK = 250mA VIN = 12V, VTRK = 4.5 VIN = 12V, ITRK = 250mA No Load on VSTBY VTRK = 5V, VIN = 0V f = 120Hz, ITRK = 250mA 7V VIN 17V 60 275 -25 1.5 5 5 100 400 500 25 200 70 50 1500 +25 5 50 50 150 700 mV A mV mV mV mV mA mA A dB
s Standby Output (VSTBY) Output Voltage, VSTBY Line Regulation Load Regulation Dropout Voltage (VIN VSTBY) Current Limit Short Circuit Current Quiescent Current 6V VIN 26V 100A ISTBY 100mA 6V VIN 26V 100A ISTBY 100mA ISTBY = 100A ISTBY = 100mA VIN = 12V, VSTBY = 4.5V VIN = 12V, VSTBY = 0V VIN = 12V, ISTBY = 100mA ITRK = 0mA VIN = 12V, ISTBY = 300A ITRK = 0mA Reverse Current Ripple Rejection VSTBY = 5V, VIN = 0V f = 120Hz, ISTBY = 100mA 7V VIN 17V 60 125 10 4.90 5.00 5 5 100 400 200 100 10 140 100 70 20 200 200 5.10 50 50 150 600 V mV mV mV mV mA mA mA A A dB
Note 1: VTRK connected to Adj lead. VTRK can be set to higher values by using an external resistor divider.
2
CS8361
Electrical Characteristics: 6V VIN 26V, IOUT1 = IOUT2 = 100A, -40C TA +125C, -40C TJ +150C,
unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s RESET ENABLE Functions ENABLE Input Threshold ENABLE Input Bias Current RESET Threshold High (VRH) RESET Hysteresis RESET Threshold Low (VRL) RESET Leakage Output Voltage Low (VRLO); RRST = 10k1/2 Low (VRPEAK) 1V VSTBY VRL VSTBY, Power Up, Power Down 0.1 0.6 VSTBY Decreasing VENABLE = 0V to 10V VSTBY Increasing 0.8 -10 4.59 60 4.53 1.2 0 4.87 120 4.75 2.0 10 VSTBY-0.02 180 VSTBY-0.08 25 0.4 1.0 V A V mV V A V V
s Protection Circuitry (Both Outputs) Independent Thermal Shutdown Overvoltage Shutdown VSTBY VTRK 150 150 30 180 165 34 38 C C V
Package Lead Description
PACKAGE LEAD # LEAD SYMBOL FUNCTION
7L 7L TO-220 D2PAK 1 1 2 3 4 5 2 3 4 5
16L PDIP & SO Wide (Internally Fused Leads) 16 1 3 4,5,12,13 6
20L SO Wide (Internally Fused Leads) 20 1 2 4,5,6,7 14,15,16,17 8
VSTBY VIN VTRK Gnd Adj
Standby output voltage delivering 100mA. Input voltage. Tracking output voltage controlled by ENABLE delivering 250mA. Reference ground connection. Resistor divider from VTRK to Adj. Sets the output voltage on VTRK. If tied to VTRK, VTRK will track VSTBY. Provides on/off control of the tracking output, active LOW. CMOS compatible output lead that goes low whenever VSTBY falls out of regulation. No Connection.
6 7
6 7
8 9 2,7,10, 11,14,15
10 11 3,9,12,13, 18,19
ENABLE RESET NC
3
CS8361
Circuit Description
ENABLE Function VTRK Output Voltage
The ENABLE function switches the output transistor for VTRK on and off. When the ENABLE lead voltage exceeds 1.4V(typ), VTRK turns off. This input has several hundred millivolts of hysteresis to prevent spurious output activity during power-up or power-down.
RESET Function
This output uses the same type of output device as VSTBY, but is rated for 250mA. The output is configured as a tracking regulator of the standby output. By using the standby output as a voltage reference, giving the user an external programming lead (Adj lead), output voltages from 5V to 20V are easily realized. The programming is done with a simple resistor divider (Figure 2), and following the formula: VTRK = VSTBY (1 + R1/R2) + IAdj R1 If another 5V output is needed, simply connect the Adj lead to the VTRK output lead.
The RESET is an open collector NPN transistor, controlled by a low voltage detection circuit sensing the VSTBY (5V) output voltage. This circuit guarantees the RESET output stays below 1V (0.1V typ) when VSTBY is as low as 1V to ensure reliable operation of microprocessor-based systems.
Application Notes
External Capacitors
IOUT2(max) is the maximum output current, for the application 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: 150C - TA RQJA = (2) PD 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 heat sink will be required.
Output capacitors for the CS8361 are required for stability. Without them, the regulator outputs will oscillate. Actual size and type may vary depending upon the application load and temperature range. Capacitor effective series resistance (ESR) is also a factor in the IC stability. Worstcase is determined at the minimum ambient temperature and maximum load expected. Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristic of a particular system. Capacitors must also be rated at all ambient temperatures expected in the system. To maintain regulator stability down to -40uC, capacitors rated at that temperature must be used. More information on capacitor selection for Smart Regulators is available in the Smart Regulator application note, OCompensation for Linear Regulators.O
Calculating Power Dissipation in a Dual Output Linear Regulator
IIN VIN
Smart Regulator
IOUT1 VOUT1 IOUT2 VOUT2
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
}
Control Features
IQ
(1)
Figure 1: Dual output regulator with key performance parameters labeled.
Where VIN(max) is the maximum input voltage, VOUT1(min) is the minimum output voltage from VOUT1, VOUT2(min) is the minimum output voltage from VOUT2, IOUT1(max) is the maximum output current, for the application 4
CS8361
Application Notes: continued
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 casetoheat sink thermal resistance, and RQSA = the heat sinktoambient 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, heat sink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers.
Test & Application Circuits
B+ 0.1F C1*
VIN
VSTBY
5V, 100mA VDD R3 C2** 10F ESR<8
CS8361
RESET ENABLE Adj
MCU
RESET I/O
R2 R1
Gnd
VTRK C3**
SW 8V, 250mA 10F ESR<8
Gnd
VTRK ~ VSTBY (1 + R1/R2) For VTRK ~ 8V, R1/R2 ~ 0.6
* C1 is required if regulator is located far from power supply filter. ** C2 and C3 are required for stability.
Figure 2: 5V, 8V Regulator
B+ 0.1F C1*
VIN
VSTBY
5V, 100mA VDD R1 C2** 10F ESR<8
CS8361
RESET ENABLE Adj Gnd VTRK
MCU
RESET I/O
C3**
SW 5V, 250mA 10F ESR<8
Gnd
* C1 is required if regulator is located far from power supply filter. ** C2 and C3 are required for stability.
Figure 3: Dual 5V Regulator
5
CS8361
Package Specification
PACKAGE DIMENSIONS IN mm(INCHES) PACKAGE THERMAL DATA
D Lead Count 16L PDIP 16L SO Wide* 20L SO Wide* Metric Max Min 19.69 18.67 10.50 10.10 13.00 12.60 English Max Min .775 .735 .413 .398 .512 .496
Thermal Data 7L 7L TO-220 16L PDIP 16L SO Wide* 20L SO Wide* D2PAK
typ
RQJA 10-50** 50 80 75 55
RQJC 3.5 3.5 42 18 9
uC/W
7 Lead D2PAK (DPS)* Short-Leaded
1.68 (.066) 1.40 (.055) 10.31 (.406) 10.05 (.396) 1.40 (.055) 1.14 (.045)
** Depending on thermal properties of substrate. RQJA = RQJC + RQCA 7 Lead TO-220 (T) Straight
8.53 (.336) 8.28 (.326)
14.71 (.579) 13.69 (.539)
2.79 (.110) 2.54 (.100)
1.98 (.078) 1.47 (.058)
10.54 (.415) 9.78 (.385) 2.87 (.113) 2.62 (.103)
4.83 (.190) 4.06 (.160)
1.40 (.055) 1.14 (.045)
0.91 (.036) 0.66 (.026) TERMINAL 8 6.50 (.256) REF
1.27 (.050) REF
.254 (.010) REF
6.55 (.258) 5.94 (.234)
4.57 (.180) 4.31 (.170)
3.96 (.156) 3.71 (.146)
14.99 (.590) 14.22 (.560)
7.75 (.305) REF
0.10 (.004) 0.00 (.000)
14.22 (.560) 13.72 (.540)
*CHERRY SEMICONDUCTOR SHORT-LEADED FOOTPRINT
0.94 (.037) 0.58 (.023)
Surface Mount Wide Body (DW); 300 mil wide
1.40 (.055) 1.14 (.045) 7.75 (.305) 7.49 (.295) 0.64 (.025) 0.38 (.015) 0.56 (.022) 0.36 (.014)
7.60 (.299) 7.40 (.291)
10.65 (.419) 10.00 (.394)
2.92 (.115) 2.29 (.090)
Plastic DIP (N); 300 mil wide
0.51 (.020) 0.33 (.013)
1.27 (.050) BSC
2.49 (.098) 2.24 (.088)
7.11 (.280) 6.10 (.240)
2.65 (.104) 2.35 (.093)
1.27 (.050) 0.40 (.016)
REF: JEDEC MS-013
0.32 (.013) 0.23 (.009) D 0.30 (.012) 0.10 (.004)
8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115)
1.77 (.070) 1.14 (.045)
2.54 (.100) BSC
Ordering Information
Part Number CS8361YDPS7 CS8361YDPSR7 CS8361YT7 CS8361YDWF16 CS8361YDWFR16 CS8361YN16 CS8361YDW20 CS8361YDWR20
Rev. 5/4/99
Description 7L D2PAK short-leaded 7L D2PAK short-leaded, (tape & reel) 7L TO-220 (Straight) 16L SO Wide* 16L SO Wide*, (tape & reel) 16L PDIP 20L SO Wide* 20L SO Wide*, (tape & reel) 6
.356 (.014) .203 (.008)
0.39 (.015) MIN. .558 (.022) .356 (.014) Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same.
REF: JEDEC MS-001
D
* Internally Fused Leads 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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