Intersil Corporation CA3277 Datasheet
April 1994
CA3277
Dual 5V Regulator with Serial Data Buffer
Interface for Microcontroller Applications
Features
• Dual 5V Regulator
-V
-V
1 at 5V 100mA - Standby
OUT
2 at 5V 100mA - Enabled
OUT
- Regulation Range 6V to 18V
- Bandgap Voltage References
• Low Quiescent Idle Current, 500µA Typ.
• Over-Voltage Shutdown Protection, 20.5V Typ.
• Reverse Battery Protection, -26V Max.
• Thermal Shutdown Protection
• Short Circuit Current Limiting
• Low Input P.S. Flag and Delayed Reset Control
• Low Voltage Shutdown Control, Ouput1
• Ignition Comparator Logic Level Control
• Data Comparator and 100X Current Mult. Used
as Input/Output Buffers for Remote Serial Data
Communication
Applications
• Automotive 5V Regulators and Data Buffers
• Industrial Controller Remote System
• Microcontroller and Memory Power Supply
• Radio, TV, CATV, Consumer Applications
Description
The CA3277 is a Dual 5V Voltage Regulator IC intended for microprocessor and logic controller applications. It is supplied with features that are commonly specified for sequentially controlled
shutdown and startup requirements of microcontrollers. Over-voltage shutdown, short circuit current limiting and thermal shutdown
features are provided for protection in the harsh environmental applications of industrial and automotive systems. The CA3277 functions
are complementary to the needs of microcontroller and memory circuits, providing for sustained memory with a 5V standby output.
The Ignition Comparator senses the voltage level at the IGN IN input
and provides a 5V logic switched output (supply sourced from
OUT1). The Ignition Output, IGN OUT can be used to signal a system microcontroller which can respond with a logic switched output
to the CA3277 ENABLE input control for OUT2. The OUT1 +5V
Standby Supply of the regulator is normally used as a power supply
for microcontroller/memory circuits to preserve stored data when in
the standby mode.To allow for maximum heat transfer from the chip,
the four center leads are directly connected to the die mounting pad.
Refer to AN9302 for further information on CA3277 circuit Applications.
Ordering Information
PART NUMBER TEMPERATURE RANGE PACKAGE
CA3277E -40oC to +85oC 16 Lead Plastic DIP
Pinout
CA3277 (PDIP)
TOP VIEW
1
BATT
2
OUT1
DATA IN
DATA OUT
RESET
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
407-727-9207
3
4
GND
5
GND
6
7
CRST
8
| Copyright © Intersil Corporation 1999
16
IGN
15
OUT2
14
ENABLE
13
GND
12
GND
11
IGN OUT
10
CUR IN
9
CUR OUT
Functional Block Diagram
1
BATT
OVER-
DATA IN
V
BATT
VOLTAGE
SHTDWN
OVER-
TEMP
SHTDWN
3
IN
-2.9V
LOW
VOLTAGE
SHTDWN
+
-
7-39
6
DATA
OUT
BANDGAP
VOLTAGE
ENABLE
(OUTPUT2)
16
IGN IN
6V
REF
2
OUT1
+5V
9
CUR
OUT
(STANDBY)
15
OUT2
+5V
(ENABLE)
4, 5 AND
12, 13
GND
2792.4
OUT1 REG.
+
DR. CNTRL
-
RESET
10
CUR
IN
8
7
CRST
OUT2 REG.
DR. CNTRL
CURRENT
MULTIPLIER
11
IGN
OUT
+
-
+
-
-
+
1.2V
14
+
-
File Number
Specifications CA3277
Absolute Maximum Ratings Thermal Information
Max. BATT, IGN IN Input Voltage (Note1). . . . . . . . . . . . . . . ±26V
Max. Operating Voltage; BATT, IGN IN . . . . . . . V
BATT(SD)
(~20.5V)
Max. Positive Voltages: (For Negative Voltages, Note 2)
ENABLE Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
DATA IN Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
CUR OUT, Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
RESET, Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
Max. Operating Load Current, OUT1 . . . . . . . . . . . . . . . . . . .100mA
Max. Operating Load Current, OUT2 . . . . . . . . . . . . . . . . . . .100mA
Max. Current Mult. Load Currents:
Min. Load Resistance, CUR OUT . . 225Ω to BATT (75mA max)
Min. Load Resistance, CUR IN . . . . . . 1KΩ to GND (-5mA max)
Max. Load Current OUT1, OUT2 (Short Duration) . . . Self-Limiting
Max. Plus/Minus Load Currents: (Note 3)
IGN OUT Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Self-Limiting
DATA OUT Output . . . . . . . . . . . . . . . . . . . . . . . . . . .Self-Limiting
RESET Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Self-Limiting
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Thermal Resistance θ
Plastic DIP Package . . . . . . . . . . . . . . . . 60oC/W 12oC/W
(Temp. meas. on center lead next to case)
Power Dissipation, PD (Note 4):
BATT
BATT
BATT
BATT
Up to +60oC (Free Air). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5W
Above +60oC: . . . . . . . . . . . . . . . . Derate Linearly at 16.6mW/oC
Up to +85oC w/heat sink (PC Board): . . . . . . . . . . . . . . . . . 1.6 W
Operating Temperature Range . . . . . . . . . . . . . . . . .-40oC to +85oC
Storage Temperature Range. . . . . . . . . . . . . . . . . .-55oC to +150oC
Max. Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . +150oC
Lead Temperature (During Solder) . . . . . . . . . . . . . . . . . . . . +265oC
1/16 ± 1/32” from case, 10s max
JA
θ
JL
Electrical Specifications T
= -40oC to +85oC, V
A
= 13.5V, ENABLE ON (VEN = 3.5V), IGN IN connected to BATT, OUT1 and
BATT
OUT2 bypassed with 20µF to GND, DATA IN connected through 250Ω to BATT, LOADS: OUT1 = 50mA,
OUT2 = 80mA; Unless Otherwise Specified (Refer to Figure 4 Test Circuit)
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
REGULATOR OUTPUT1
Output Voltage V
Dropout Voltage (Note 5) V
OUT1
DO1
Line Reg V
Load Reg I
V
= 9V to 16V 4.75 5 5.25 V
BATT
V
= 4.75V 4.15 4.6 - V
BATT
= 6.2V to 16V - 9 40 mV
BATT
= 0.5mA to 50mA - 30 60 mV
LOAD
Current Limiting - 170 250 mA
Low Voltage Shutdown Ramp V
Down Until OUT1 drops (PNP Driv-
BATT
- 3.5 - V
er Cutoff)
REGULATOR OUTPUT2
Output Voltage V
Dropout Voltage (Note 5) V
OUT2
DO2
Line Reg V
Load Reg I
V
= 9V to 16V 4.75 5 5.25 V
BATT
V
= 5.6V 4.6 5 - V
BATT
= 6.2V to 16V - 7.5 40 mV
BATT
= 0.5mA to 80mA - 35 60 mV
LOAD
Current Limiting - 190 250 mA
ENABLE Input Current I
ENABLE Input Sw. Thd. V
EN
EN(THD)
VEN = 5V - 50 150 µA
Ramp ENABLE Input Up Until OUT2 is
- 1.2 - V
Switched ON
CURRENT MULTIPLIER
Current Mult. Gain, (I
COUT/ICIN
)I
= -200µA 80 100 - Gain
CIN
Ratio
Current Mult. Output Sat. V
Current Mult., Max. Drive Cur. I
COUT(SAT)ICIN
COUT(MAX)ICIN
= -200µA, CUR OUT Load = 1KΩ to V
BATT
- 0.3 1 V
= -700µA3550-mA
RESET
Reset, (RST) Threshold Ramp V
RESET (V
Reset Delay Time (Note 6) t
RST
CRST Cap. = 0.47µF, V
Down, Measure V
BATT
) goes low
RST
BATT
BATT
= 6.8V
when
3.8 4.2 4.5 V
50 150 250 ms
RESET Load = 5KΩ to OUT1
RESET Out High V
RESET Low V
RESET Output Sink Current I
OH(RST)
OL(RST)
OL
47KΩ to OUT1 4 - - V
V
= 3.75V, RST 47KΩ to OUT1 - - 0.2 V
BATT
CRST to GND, V
= 6.8V - 8 - mA
BATT
7-40
Specifications CA3277
Electrical Specifications T
= -40oC to +85oC, V
A
= 13.5V, ENABLE ON (VEN = 3.5V), IGN IN connected to BATT, OUT1 and
BATT
OUT2 bypassed with 20µF to GND, DATA IN connected through 250Ω to BATT, LOADS: OUT1 = 50mA,
OUT2 = 80mA; Unless Otherwise Specified (Refer to Figure 4 Test Circuit) (Continued)
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
DATA COMPARATOR
Data Comp Thd V
BATT
- 3.6
V
BATT
-2.9
V
BATT
-2.2
V
Data Comp Hysteresis - 200 - mV
DATA OUT Low V
DATA OUT High V
OL
OH
V
V
BATT
BATT
= 16V, V
= 16V, V
= (V
DATA IN
= 16V V
DATA IN
-5V) - - 0.15 V
BATT
OUT1
- 5.25 V
-0.15
DATA OUT Low Sink Current I
DATA OUT High Source Current I
OL
OH
V
DATA IN
V
DATA IN
Low - 1 - mA
High - -50 - µA
IGNITION COMPARATOR
Ign Comp Thd 5.5 6 6.5 V
Ign Comp Hysteresis - 200 - mV
IGN OUT Low V
IGN OUT High V
IGN OUT Low Sink Current I
IGN OUT High Source Current I
OH
OL
OH
OL
V
Low - 1 - mA
IGN IN
V
High - -70 - µA
IGN IN
- - 0.15 V
4.6 5.25 V
OTHER PARAMETERS
Idle Current I
Over-Voltage Shutdown V
BATT(OVSD)
Q
V
= 12.6V, No Loads, VEN = V
BATT
Ramp V
Up Until OUT1 and OUT2 Shut-
BATT
= 0V - 500 800 µA
IGN IN
19 20.5 23 V
down
Thermal Shutdown T
J
Ripple Rejection 1VPP at 3kHz on BATT INPUT, Measure AC
- 150 -
45 55 - dB
o
C
Ripple on OUT1, OUT2
NOTES:
1. For negative voltages on the BATT and IGN IN inputs, current drain is primarily reverse junction leakage, except when DATA IN, CUR
OUT, ENABLE and RESET are directly connected to BATT. (Note 2)
2. For negative voltage DATA IN, CUR OUT, ENABLE and RESET interface to NPN or equivalent on-chip structures; providing a forward
junction for current conduction into the IC. Negative current must be limited by the impedance of the external connection. This is also the
case where these terminals are interconnected to BATT, Normal application does not require the BATT connection, except for DATA IN
where a series diode for reverse current blocking may be used. (see Description text information)
3. Refer to the Electrical Characteristic TABLE for all Self-Limiting values.
4. Dissipation, approximately equals: P
pation and V
OUT1~VOUT2
5. Dropout Voltage is V
6. Reset Delay Time, t
~5V. This assumes neglibible dissipation for the Ignition Comp., Reset and Data Comp. Outputs.
= (V
DO1
RST
BATT
is the time period that the RESET (Pin 8) is low following the discharge of the CRST capacitor to ground. For test
≈ [(V
D
INIIN
-V
) for REG. OUT1 and V
OUT1
) + (V
CUR OUTICUR OUT
DO2
) - 5(I
= (V
OUT1+IOUT2
-V
BATT
OUT2
)], where IINVIN is IGN IN and BATT input dissi-
) for REG. OUT2
evaluation, the CRST pin may be discharged repetitively with a transistor switch. The RESET pin switches from low to high when the
CRST pin is charged to approximately 3V. Normal ATE testing measures the source charging current. which is typically 10µA. For any
other value of Capacitor the charge time, t for reset is determined as follows: t ~308C, where C is in µF and t is in milliseconds.
(i.e. C = 0.47µF, t = 141ms)
7-41
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