Cherry CS8361YDPS7 5v dual micropower low dropout regulator with enable and reset Datasheet

CS8361
CS8361
5V Dual Micropower Low Dropout
Regulator with ENABLE and RESET
Description
Features
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.
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
140µA with a 300µA 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.
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.
Block Diagram
VSTBY
VIN
Overvoltage
Shutdown
5V,100mA,2%
Current
Limit
Bandgap
■ 2 Regulated Outputs
Standby Output 5V
±2%; 100mA
Tracking Output 5V;
250mA
■ Low Dropout Voltage
(0.4V at rated current)
■ RESET Option
■ ENABLE Option
■ Low Quiescent Current
■ Protection Features
Independent Thermal
Shutdown
Short Circuit
60V Load Dump
Reverse Battery
Package Options
16 Lead PDIP & SOIC Wide
(internally fused leads)
RESET
OVSD
+
BG
VIN
BG
–
TSD
VSTBY
1
NC
OVSD
VIN
VTRK
NC
VTRK
NC
Gnd
Gnd
Gnd
Gnd
Adj
NC
NC
NC
250mA
ENABLE
Current
Limit
Thermal
Shutdown
TSD
RESET
7L D2PAK
7L TO-220
–
Adj
+
ENABLE
VSTANDBY
–
+
TSD
1. VSTBY
2. VIN
3. VTRK
4. Gnd
5. Adj
6. ENABLE
7. RESET
OVSD
BG
RESET
+
Gnd
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: [email protected]
Web Site: www.cherry-semi.com
Rev. 5/4/99
1
A
®
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...........................................................................................................................................-40¡C to +150¡C
Storage Temperature Range ................................................................................................................................-55¡C to +150¡C
ESD Susceptibility (Human Body Model)..............................................................................................................................2kV
Lead Temperature Soldering
Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak
Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak
Electrical Characteristics: 6V ² VIN ² 26V, IOUT1 = IOUT2 = 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ ² +150¡C,
unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
+25
mV
1.5
5
µA
■ Tracking Output (VTRK)
VSTBY Ð VTRK,
VTRK Tracking Error
6V ² VIN ² 26V
100µA ² ITRK ² 250mA (note 1)
-25
Adjust Pin Current, IAdj
Loop in Regulation
Line Regulation
6V ² VIN ² 26V (note 1)
5
50
mV
Load Regulation
100µA ² ITRK ² 250mA (note 1)
5
50
mV
Dropout Voltage (VIN Ð VTRK)
ITRK = 100µA
ITRK = 250mA
100
400
150
700
mV
mV
Current Limit
VIN = 12V, VTRK = 4.5
Quiescent Current
VIN = 12V, ITRK = 250mA
No Load on VSTBY
25
50
mA
Reverse Current
VTRK = 5V, VIN = 0V
200
1500
µA
Ripple Rejection
f = 120Hz, ITRK = 250mA
7V ² VIN ² 17V
275
500
mA
60
70
dB
4.90
5.00
5.10
V
■ Standby Output (VSTBY)
Output Voltage, VSTBY
6V ² VIN ² 26V
100µA ² ISTBY ² 100mA
Line Regulation
6V ² VIN ² 26V
5
50
mV
Load Regulation
100µA ² ISTBY ² 100mA
5
50
mV
Dropout Voltage (VIN Ð VSTBY)
ISTBY = 100µA
ISTBY = 100mA
100
400
150
600
mV
mV
Current Limit
VIN = 12V, VSTBY = 4.5V
125
200
mA
Short Circuit Current
VIN = 12V, VSTBY = 0V
10
100
mA
Quiescent Current
VIN = 12V, ISTBY = 100mA
ITRK = 0mA
10
20
mA
VIN = 12V, ISTBY = 300µA
ITRK = 0mA
140
200
µA
Reverse Current
VSTBY = 5V, VIN = 0V
100
200
µA
Ripple Rejection
f = 120Hz, ISTBY = 100mA
7V ² VIN ² 17V
60
70
Note 1: VTRK connected to Adj lead. VTRK can be set to higher values by using an external resistor divider.
2
dB
CS8361
Electrical Characteristics: 6V ² VIN ² 26V, IOUT1 = IOUT2 = 100µA, -40¡C ² TA ²+125¡C, -40¡C ²TJ ² +150¡C,
unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.8
1.2
2.0
V
µA
■ RESET ENABLE Functions
ENABLE Input Threshold
ENABLE Input Bias Current
VENABLE = 0V to 10V
-10
0
10
RESET Threshold High (VRH)
VSTBY Increasing
4.59
4.87
VSTBY-0.02
V
60
120
180
mV
4.53
4.75
VSTBY-0.08
V
25
µA
0.4
1.0
V
V
RESET Hysteresis
RESET Threshold Low (VRL)
VSTBY Decreasing
RESET Leakage
Output Voltage
Low (VRLO); RRST = 10k½
Low (VRPEAK)
1V ² VSTBY ² VRL
VSTBY, Power Up, Power Down
0.1
0.6
■ Protection Circuitry (Both Outputs)
Independent Thermal Shutdown
VSTBY
VTRK
Overvoltage Shutdown
150
150
180
165
30
34
¡C
¡C
38
V
Package Lead Description
PACKAGE LEAD #
7L
7L
TO-220 D2PAK
1
1
LEAD SYMBOL
16L PDIP & SO
Wide (Internally
Fused Leads)
16
20L SO Wide
(Internally
Fused Leads)
20
FUNCTION
VSTBY
Standby output voltage delivering 100mA.
2
2
1
1
VIN
Input voltage.
3
3
3
2
VTRK
Tracking output voltage controlled by
ENABLE delivering 250mA.
4
4
4,5,12,13
Gnd
Reference ground connection.
5
5
6
4,5,6,7
14,15,16,17
8
Adj
6
6
8
10
ENABLE
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.
7
7
9
11
RESET
CMOS compatible output lead that goes low
whenever VSTBY falls out of regulation.
2,7,10,
11,14,15
3,9,12,13,
18,19
NC
No Connection.
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.
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:
RESET Function
VTRK = VSTBY ´ (1 + R1/R2) + IAdj ´ R1
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.
If another 5V output is needed, simply connect the Adj
lead to the VTRK output lead.
Application Notes
IOUT2(max) is the maximum output current, for the
application
External Capacitors
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.
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:
150¡C - 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 150¡C.
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.
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.
Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability
down to -40ûC, capacitors rated at that temperature must
be used.
More information on capacitor selection for Smart
Regulatorsª is available in the Smart Regulator application note, ÒCompensation for Linear Regulators.Ó
IIN
Smart
Regulator
VIN
IOUT1
VOUT1
IOUT2
Calculating Power Dissipation
in a Dual Output Linear Regulator
VOUT2
}
The maximum power dissipation for a dual output regulator (Figure 1) is:
PD(max) = {VIN(max)ÐVOUT1(min)}IOUT1(max)+
{VIN(max)ÐVOUT2(min)}IOUT2(max)+VIN(max)IQ
Control
Features
IQ
(1)
Where
VIN(max) is the maximum input voltage,
Figure 1: Dual output regulator with key performance parameters
labeled.
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
where:
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheat sink thermal resistance, and
RQSA = the heat sinkÐtoÐambient thermal resistance.
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.
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.
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)
Test & Application Circuits
B+
0.1µF
C1*
5V, 100mA
VSTBY
VIN
VDD
C2**
R3
CS8361
10µF
ESR<8Ω
MCU
RESET
RESET
ENABLE
I/O
R2
Adj
R1
SW 8V,
250mA
VTRK
Gnd
C3**
Gnd
10µF
ESR<8Ω
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+
VIN
0.1µF
C1*
5V, 100mA
VSTBY
VDD
R1
CS8361
C2**
10µF
ESR<8Ω
MCU
RESET
RESET
ENABLE
I/O
Adj
Gnd
SW 5V,
250mA
VTRK
C3**
10µF
ESR<8Ω
* 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
Gnd
CS8361
Application Notes: continued
CS8361
Package Specification
PACKAGE DIMENSIONS IN mm(INCHES)
PACKAGE THERMAL DATA
D
Lead Count
Metric
Max
Min
19.69 18.67
10.50 10.10
13.00 12.60
16L PDIP
16L SO Wide*
20L SO Wide*
Thermal Data
English
Max
Min
.775
.735
.413
.398
.512
.496
7L
7L TO-220
16L PDIP
16L SO Wide*
20L SO Wide*
7 Lead D2PAK (DPS)* Short-Leaded
1.68 (.066)
1.40 (.055)
typ
D2PAK
RQJA
RQJC
10-50**
3.5
3.5
42
18
9
50
80
75
55
ûC/W
** Depending on thermal properties of substrate. RQJA = RQJC + RQCA
1.40 (.055)
1.14 (.045)
10.31 (.406)
10.05 (.396)
7 Lead TO-220 (T) Straight
8.53 (.336)
8.28 (.326)
2.79 (.110)
2.54 (.100)
14.71 (.579)
13.69 (.539)
10.54 (.415)
9.78 (.385)
1.98 (.078)
1.47 (.058)
0.91 (.036)
0.66 (.026)
TERMINAL 8
1.27 (.050)
REF
1.40 (.055)
1.14 (.045)
4.83 (.190)
4.06 (.160)
2.87 (.113)
2.62 (.103)
.254 (.010)
REF
6.50 (.256) REF
6.55 (.258)
5.94 (.234)
14.99 (.590)
14.22 (.560)
3.96 (.156)
3.71 (.146)
4.57 (.180)
4.31 (.170)
7.75 (.305)
REF
0.10 (.004)
0.00 (.000)
14.22 (.560)
13.72 (.540)
0.94 (.037)
0.58 (.023)
*CHERRY SEMICONDUCTOR SHORT-LEADED FOOTPRINT
Surface Mount Wide Body (DW); 300 mil wide
1.40 (.055)
1.14 (.045)
7.60 (.299)
7.40 (.291)
0.56 (.022)
0.36 (.014)
0.64 (.025)
0.38 (.015)
7.75 (.305)
7.49 (.295)
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
7.11 (.280)
6.10 (.240)
2.49 (.098)
2.24 (.088)
1.27 (.050)
0.40 (.016)
2.65 (.104)
2.35 (.093)
8.26 (.325)
7.62 (.300)
0.32 (.013)
0.23 (.009)
D
REF: JEDEC MS-013
1.77 (.070)
1.14 (.045)
2.54 (.100) BSC
3.68 (.145)
2.92 (.115)
0.30 (.012)
0.10 (.004)
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)
.356 (.014)
.203 (.008)
0.39 (.015)
MIN.
.558 (.022)
.356 (.014)
REF: JEDEC MS-001
D
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
* 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.
6
© 1999 Cherry Semiconductor Corporation
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