Intersil CA3277 Dual 5v regulator with serial data buffer interface for microcontroller application Datasheet

CA3277
Dual 5V Regulator with Serial Data Buffer
Interface for Microcontroller Applications
April 1994
Features
Description
• Dual 5V Regulator
- VOUT1 at 5V 100mA - Standby
- VOUT2 at 5V 100mA - Enabled
- Regulation Range 6V to 18V
- Bandgap Voltage References
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.
• Low Quiescent Idle Current, 500µA Typ.
• Over-Voltage Shutdown Protection, 20.5V Typ.
• Reverse Battery Protection, -26V Max.
• Thermal Shutdown Protection
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.
• 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
Refer to AN9302 for further information on CA3277 circuit Applications.
Applications
• Automotive 5V Regulators and Data Buffers
Ordering Information
• Industrial Controller Remote System
• Microcontroller and Memory Power Supply
PART NUMBER
• Radio, TV, CATV, Consumer Applications
CA3277E
Pinout
-40oC to +85oC
PACKAGE
16 Lead Plastic DIP
Functional Block Diagram
CA3277 (PDIP)
TOP VIEW
BATT
TEMPERATURE RANGE
1
16 IGN
OUT1
2
15 OUT2
DATA IN
3
14 ENABLE
GND
4
13 GND
GND
5
12 GND
DATA OUT
6
11 IGN OUT
CRST
7
10 CUR IN
RESET
8
9 CUR OUT
1
2
BATT
OUT1
+5V
(STANDBY)
OVERVOLTAGE
SHTDWN
OUT1 REG.
DR. CNTRL
+
-
BANDGAP
VOLTAGE
REF
LOW
VOLTAGE
SHTDWN
RESET
8
7
CRST
+
1.2V
-
15
OVERTEMP
SHTDWN
+
-
OUT2 REG.
DR. CNTRL
+
-
ENABLE 14
(OUTPUT2)
DATA IN 3
IN
6
IGN IN
16
DATA
OUT
+
-
6V
VBATT -2.9V
OUT2
+5V
(ENABLE)
+
11
10
IGN
OUT
CUR
IN
CURRENT
MULTIPLIER
9
CUR
OUT
4, 5 AND
12, 13
GND
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
407-727-9207 | Copyright © Intersil Corporation 1999
7-39
File Number
2792.4
Specifications CA3277
Absolute Maximum Ratings
Thermal Information
Max. BATT, IGN IN Input Voltage (Note1) . . . . . . . . . . . . . . . ±26V
Max. Operating Voltage; BATT, IGN IN . . . . . . . VBATT(SD) (~20.5V)
Max. Positive Voltages: (For Negative Voltages, Note 2)
ENABLE Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VBATT
DATA IN Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VBATT
CUR OUT, Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VBATT
RESET, Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VBATT
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
Thermal Resistance
θJA
θJL
Plastic DIP Package . . . . . . . . . . . . . . . .
60oC/W
12oC/W
(Temp. meas. on center lead next to case)
Power Dissipation, PD (Note 4):
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
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.
Electrical Specifications
PARAMETERS
TA = -40oC to +85oC, VBATT = 13.5V, ENABLE ON (VEN = 3.5V), IGN IN connected to BATT, OUT1 and
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)
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REGULATOR OUTPUT1
Output Voltage
VOUT1
VBATT = 9V to 16V
4.75
5
5.25
V
Dropout Voltage (Note 5)
VDO1
VBATT = 4.75V
4.15
4.6
-
V
Line Reg
VBATT = 6.2V to 16V
-
9
40
mV
Load Reg
ILOAD = 0.5mA to 50mA
-
30
60
mV
-
170
250
mA
-
3.5
-
V
5
5.25
V
Current Limiting
Low Voltage Shutdown
Ramp VBATT Down Until OUT1 drops (PNP Driver Cutoff)
REGULATOR OUTPUT2
Output Voltage
VOUT2
VBATT = 9V to 16V
4.75
Dropout Voltage (Note 5)
VDO2
VBATT = 5.6V
4.6
5
-
V
Line Reg
VBATT = 6.2V to 16V
-
7.5
40
mV
Load Reg
ILOAD = 0.5mA to 80mA
-
35
60
mV
-
190
250
mA
VEN = 5V
-
50
150
µA
Ramp ENABLE Input Up Until OUT2 is
Switched ON
-
1.2
-
V
80
100
-
Gain
Ratio
-
0.3
1
V
Current Limiting
ENABLE Input Current
ENABLE Input Sw. Thd.
IEN
VEN(THD)
CURRENT MULTIPLIER
Current Mult. Gain, (ICOUT/ICIN)
ICIN = -200µA
Current Mult. Output Sat.
VCOUT(SAT)
ICIN = -200µA, CUR OUT Load = 1KΩ to VBATT
Current Mult., Max. Drive Cur.
ICOUT(MAX)
ICIN = -700µA
35
50
-
mA
Ramp VBATT Down, Measure VBATT when
RESET (VRST) goes low
3.8
4.2
4.5
V
CRST Cap. = 0.47µF, VBATT = 6.8V
RESET Load = 5KΩ to OUT1
50
150
250
ms
-
-
V
RESET
Reset, (RST) Threshold
Reset Delay Time (Note 6)
tRST
RESET Out High
VOH(RST)
47KΩ to OUT1
4
RESET Low
VOL(RST)
VBATT = 3.75V, RST 47KΩ to OUT1
-
-
0.2
V
CRST to GND, VBATT = 6.8V
-
8
-
mA
RESET Output Sink Current
IOL
7-40
Specifications CA3277
Electrical Specifications
PARAMETERS
TA = -40oC to +85oC, VBATT = 13.5V, ENABLE ON (VEN = 3.5V), IGN IN connected to BATT, OUT1 and
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)
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VBATT
- 3.6
VBATT
-2.9
VBATT
-2.2
V
DATA COMPARATOR
Data Comp Thd
Data Comp Hysteresis
DATA OUT Low
VOL
VBATT = 16V, VDATA IN = (VBATT -5V)
DATA OUT High
VOH
VBATT = 16V, VDATA IN = 16V
-
200
-
mV
-
-
0.15
V
VOUT1
-0.15
-
5.25
V
DATA OUT Low Sink Current
IOL
VDATA IN Low
-
1
-
mA
DATA OUT High Source Current
IOH
VDATA IN High
-
-50
-
µA
5.5
6
6.5
V
-
200
-
mV
-
-
0.15
V
IGNITION COMPARATOR
Ign Comp Thd
Ign Comp Hysteresis
IGN OUT Low
VOL
IGN OUT High
VOH
5.25
V
IGN OUT Low Sink Current
IOL
VIGN IN Low
4.6
-
1
-
mA
IGN OUT High Source Current
IOH
VIGN IN High
-
-70
-
µA
IQ
VBATT = 12.6V, No Loads, VEN = VIGN IN = 0V
-
500
800
µA
VBATT(OVSD)
Ramp VBATT Up Until OUT1 and OUT2 Shutdown
19
20.5
23
V
-
150
-
oC
45
55
-
dB
OTHER PARAMETERS
Idle Current
Over-Voltage Shutdown
Thermal Shutdown
Ripple Rejection
TJ
1VPP at 3kHz on BATT INPUT, Measure AC
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: PD ≈ [(VINIIN) + (VCUR OUTICUR OUT) - 5(IOUT1+IOUT2)], where IINVIN is IGN IN and BATT input dissipation and VOUT1~VOUT2~5V. This assumes neglibible dissipation for the Ignition Comp., Reset and Data Comp. Outputs.
5. Dropout Voltage is VDO1 = (VBATT - VOUT1) for REG. OUT1 and VDO2 = (VBATT - VOUT2) for REG. OUT2
6. Reset Delay Time, tRST is the time period that the RESET (Pin 8) is low following the discharge of the CRST capacitor to ground. For test
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
CA3277
R1
220Ω
IGN IN
CA3277
IGN IN
C1
0.1µF
IGNITION
COMP
6V
L1
150µH
UNREG
SUPPLY IN
OUT2
OVR-VOLT
SHTDWN
BATT
330Ω
(VBATT -2.9V)
DATA
COMP
C2
200µF
OVR-TEMP
SHTDWN
SHTDWN
OUT2
ENABLE
I
CUR OUT
ERROR AMP
AND OUTPUT
CONTROL
FB
C5
0.1µF
C6
22µF
OUT1
C7
0.1µF
C8
100µF
+5V
STANDBY
OUTPUT
LOW VOLT
RESET
CURRENT
AMP
CUR
IN
FB
LOW VOLT
BANDGAP
REF
DATA IN
ERROR AMP
AND OUTPUT
CONTROL
+5V ENABLE
SWITCHED
OUTPUT
DATA IGN
EN
OUT OUT (OUT2)
CRST
GND
C3
0.47µF
R4
22kΩ
RESET
R5
47KΩ
C4
0.01µF
TO
OUT2
+5V
TDO
DISPLAY OR
CONTROL
OUTPUT
RDI SENSE CONTROL
IN
OUT
RESET VDD
+5V
CMOS
MEMORY
5V MICROCONTROLLER
VSS
BUS
NOTE:
DATA IN and CUR OUT are remote/host Serial Data Communication Buffers. Typical Remote Source
Impedance for DATA IN is 1kΩ. Typical Remote Load for CUR OUT is 250Ω.
FIGURE 1. TYPICAL APPLICATION CIRCUIT OF THE CA3277 DUAL 5V REGULATOR WITH MICROCONTROLLER AND SERIAL
DATA BUFFER INTERFACE TO A REMOTE HOST
Applications
Other functions of the CA3277 include a Data Comparator
and Current Multiplier for use as interface buffers to transfer
serial data at higher level logic to and from a remote host
microcontroller. The OUT1 5V Standby Supply provides
power to the local microcontroller which interfaces to the
CA3277 interface buffers at a 5V logic level. As shown in
Figure 1, the DATA IN input of the Data Comparator receives
serial data referenced to the BATT voltage level. The output
of the Data Comparator is 5V CMOS compatible logic and is
connected to the RDI (remote data input) terminal of the
microcontroller. The TDO (data out) output of the microcontroller is connected to the Current Multiplier input of the
CA3277.
Current Multiplier - The Current Multiplier, with internal circuitry shown in Figure 2, receives data from the
microcontroller in the form of an open drain or gate switched
output driving a 22KΩ resistor load in series to the Current
Input at pin 10 (CUR IN). The input stage of the Current Multiplier is a current mirror amplifier which is internally
connected to the 5V regulated OUT1 voltage source. The
output stage of the Current Multiplier is a current mirror
amplifier referenced to GND and has an open collector
Current Output at pin 9 (CUR OUT), with a minimum drive
capability of 35mA. The Current Multiplier output load is
normally connected via resistive loading to the BATT voltage
supply level. As such, the microcontroller transmits data out
(TDO output) to the input of the CA3277 Current Multiplier
which amplifies and translates the signal back to the voltage
reference level of the BATT power supply input. When
driving a similar remote CA3277, the voltage drop from the
BATT input line switches the Data Comparator which
provides serial data to the RDI input of the remote microcontroller. The nominal current gain of the Current Multiplier is
100X.
The application use of the Current Multiplier is not limited to
digital serial data transfer. The Current Multiplier is an
independent function and is open to use for other purposes,
including linear signal amplification, sensor output amplification and current controlled threshold switching. The current
output terminal, CUR OUT may be externally loadconnected to OUT1, OUT2, BATT or any other power supply
level up to the maximum ratings given for the BATT input
terminal. It is important to note that some applied uses of the
Current Multiplier may contribute significant on-chip power
dissipation. A nominal current mirror input drive of 200µA will
provide sufficient drive to switch a 250Ω resistor load at the
input of the data comparator. As such, the quiescent OFF
condition of the Data comparator should be in the High state.
7-42
CA3277
CA3277
BATT
INTERNALLY
CONNECTED
TO OUT1 (+5V)
250Ω
Q99
CUR
IN
10
ICIN
GND
DI
Q100
510Ω
5X
GAIN
Q101
Q102
C3
10pF
DATA
COMP.
+
-
Q103
CUR
OUT
9
CA3277
REMOTE
SYSTEM
20X
GAIN
4, 5 AND
12, 13
FIGURE 2. CURRENT MULTIPLIER DRIVING A REMOTE
CA3277 DATA COMPARATOR
Data Comparator - The Data Comparator provides a means
of translating serial data from a high to low voltage. The
DATA IN terminal of the Data Comparator is biased to
receive signal input that is source referenced to the BATT
supply voltage level. In normal use the signal input would be
supplied from a remote Current Multiplier having a resistor
load tied to the BATT voltage supply. The DATA OUT output
from the Data Comparator is CMOS compatible 5V noninverting logic data referenced to GND. The switching
threshold at the DATA IN input is bias stabilized by the bandgap voltage and is typically at (VBATT - 2.9V). The Data
Comparator is in a high state when DATA IN input is at the
BATT voltage level and is in a low state when DATA IN is at
(VBATT - 5V). The output stage of the Data Comparator is
internally supply biased from the Switched 5V Regulator
output to provide a high state of 5V and a low state of 0V
(GND). The DATA OUT terminal can typically sink 1.2mA in a
low state or source 50µA in a high state.
In system applications the Data Comparator is used to
translate remote data at high voltage down to 5V logic levels.
The Current Multiplier is used to reverse the process by
translating 5V logic data back to the BATT voltage level
when sending data back to the remote system. The Data
Comparator and Current Multiplier are level matched for
remote communication between microcontroller systems
using the common BATT power supply voltage of the
CA3277. The current driven serial data from the Current
Multiplier is sent to a remote system by translating the signal
up to the BATT voltage level, or an external power supply
level that is compatible with the remote device. The Data
Comparator of the remote system receives the data,
interfaces to its microcontroller and responds with signal
drive from its Current Multiplier to translate the signal back to
the host. For best noise immunity the transmission in each
direction should be over a twisted pair or shielded line. As
such, two microcontrollers, each with the interface protection
of a CA3277, can provide intelligent master/slave system
communications under adverse environmental conditions.
Ignition Comparator - While the Ignition Comparator is provided as an essential part of the start-up control in automotive systems, this circuit function may be used as an
independent switching comparator. It is important to note
that the thermal shutdown feature on the chip is disabled when the IGN IN input is low. Disabling of the onchip thermal protection is done to satisfy the requirement of
low idle current when the system is in a standby condition.
The non-inverting IGN IN input has a switching threshold of
typically 6V with 200mV of hysteresis and is switched with
logic levels reference to GND as the low state and BATT as
the high state. The IGN OUT output is 5V CMOS compatible
logic, equivalent to the Data Comparator output stage, but is
internally supply biased from the Standby 5V Regulator. As
such, the high state is level referenced to OUT1. The IGN
OUT output terminal can typically sink 1.2mA in a low state
or source 70µA in a high state.
Enable - A CMOS or TTL high at the ENABLE input
switches the regulated 5V/Switched Output ON at OUT2.
The ENABLE input has an internal pull-down of typically
50µA to ensure that OUT2 is OFF when the ENABLE input
is not connected. The input threshold level for switching is
the bandgap voltage reference of 1.2V. When the ENABLE
input is low, all drive current to the output pass transistor is
cutoff and OUT2 voltage drops to ground level. The ENABLE
input is normally switched from the interfacing microcontroller but may be activated from a remote source.
Reset - The purpose of the Low Voltage Reset function is to
flag a low voltage condition at OUT1. When the RESET output, pin 8 switches low, the voltage level at OUT1 has
dropped below the regulation level. The CRST and RESET
are high when OUT1 is at 5V. When OUT1 drops to less than
4.2V (typical), the CRST Capacitor at pin 7 is internally
discharged, causing the RESET pin to change from a high to
a low state, outputting a negative going pulse. The RESET
output is an NPN open collector driver requiring an external
load resistor, normally connected to OUT1. The RESET
output flag may be sent to a microcontroller to initiate a
power-down sequence. For any condition that causes OUT1
to drop below the reset threshold, such as undesired
transients, the RESET output is switched low for a delay
period, tRST determined by the value of the external
capacitor, CRST at CRST terminal. For a value of 0.47µF the
delay period is typically 141ms. This correlates to approximately 10µA of charging current sourced from the CRST
terminal to charge CRST.
Regulation - The regulated output stages of the CA3277
have similar circuits, each having an error amplifier to
compare the output voltage to the bandgap reference
voltage. The circuit of the 5V/Switched regulator is shown in
Figure 3. By feedback, the output voltage is differentially
compared to the bandgap reference voltage. The error signal
is then amplified to drive a PNP pass transistor and maintain
a stable 5V output with both line and load regulation over the
full operating temperature range. Except for the ENABLE
control of OUT2, the OUT1 drive circuit is similar to the
OUT2 circuit.
7-43
CA3277
Protection - Both OUT1 and OUT2 PNP output pass transistors are protected with Over-Voltage Shutdown and OverTemperature Shutdown. Current Limiting for each output is
independent and is accomplished by limited drive current
from the pre-drivers (Q135 for OUT2) to the PNP output
pass transistor (Q136). Over-Voltage is sensed as a threshold voltage level at the BATT input. Both output stages are
shutdown when the VBATT voltage level is typically greater
than 20.5V. When the Ignition voltage is high, the Over-Temperature level is sensed as VBE changes and compared to
the bandgap reference voltage. When the chip temperature
exceeds 150οC, both output stages are shutdown. When
Over-Voltage or Over-Temperature thresholds are exceeded,
the sensed states are ORd to switch OFF drive to the output
stages. The ENABLE control for OUT2 is added to the OR
control of the OUT2 drive circuit. The Low Voltage Shutdown
control is added to the OR control of the OUT1 drive circuit.
Low Voltage Shutdown occurs at approximately 3.5V as the
BATT supply input is ramped down, forcing cutoff of the PNP
output pass transistor. The external capacitor on OUT1
holds charge, with a long RC time constant delay to sustain
shutdown control in the microcontroller. The internal shunt
resistance at the OUT1 terminal is typically 148KΩ.
Under conditions of reverse battery or negative supply
voltages on the BATT input, current in the IC is primarily
reverse junction leakage. The design of the CA3277 is
configured to prevent high current if the power supply is
reversed. Exceptions to this are preventable. One example is
current through the DATA IN input line terminating resistor,
normally connected directly to the BATT supply line. This
provides a path for current conduction into the IC through an
internal diode junction. The current is limited by the external
resistor and may be as high as 100mA at -26V. Where
negative supply voltages are potentially a problem, the
resistive load from DATA IN to BATT can be in series with a
reverse voltage blocking diode, such as a 1N914. This input
diode-resistor circuit is shown in Figure 2 as the remote
interface and load to the Current Multiplier output.
Dissipation - The CA3277 device dissipation is the combined watts of input voltage times current less the external
watts of power supplied by the chip. For normal use, the
major contribution to on-chip dissipation is primarily the
BATT input dissipation. The Current Multiplier output has a
potential to add significant dissipation. The open collector
driver of the Current Multiplier Output, pin 9 may or may not
be in saturation when sinking current. Because it is a current
mirror output with a constant current drive, the voltage may
be increased on pin 9, with a significant increase in the
resulting dissipation. The chip dissipation is approximately
equal to:
PD ≈ [(VINIIN) + (VCOUTICOUT) - 5(IOUT1+IOUT2)]
where IINVIN is IGN IN and BATT input dissipation, assuming
VBATT = VIGN IN , and VOUT1 ~ VOUT2 ~ 5V. This assumes
negligible dissipation for the Ignition Comparator, Data
Comparator and Reset outputs.
OUT2 PASS
TRANSISTOR
15
Q136
TO BATT
Q119
Q14
Q131
Q126
Q75
Q16
IB
VBG
REF
Q134
Q121
7
EN INPUT
Q122
Q123
Q120
Q124
Q133
Q125
50µA
R32
6.4K
Q128
Q127
ERROR
AMP
VBG
REF
Q129
ENABLE
SWITCH
OVER-VOLTAGE
SHUTDOWN
R29
0.87K
Q135
Q132
Q130
OVER-TEMPERATURE
SHUTDOWN
R30
2K
R33
6.4K
R31
23
CURRENT
LIMITED DRIVE
FIGURE 3. OUTPUT2 DRIVER AND ERROR AMPLIFIER WITH THE ENABLE CONTROL
7-44
OUT2
+5V
CA3277
IEN
VEN
A
VOUT1
VBATT
14
ENABLE
(OUT2)
1
BATT
250Ω
ICOUT
VIGN IN
A
2
OUT1
16
IGN IN
8
RST
1KΩ
VCOUT
250Ω
VDATA IN
VCIN
9
CUR OUT
CA3277
3
DATA IN
15
OUT2
6
DATA
OUT
11
IGN
OUT
20µF
RL1
(LOAD)
47KΩ
0 .01
VRST
IOUT1 =
CRST
RL1
0.047
VOUT2
20µF
RL2
(LOAD)
GND
ICIN
IOUT2 =
VIGN OUT
VOUT1
0.47
7
CRST
GND PINS 4,5,12,13
10
CUR IN
0.047
VOUT2
VDATA OUT
RL2
FIGURE 4. CHARACTERISTIC EVALUATION AND TEST CIRCUIT
NO LOAD INPUT CURRENT (mA)
OUTPUT VOLTAGE, VOUT1 AND VOUT2 (V)
16
1 AND 2
5
4
TA = +25oC
2
3
RL1 = 100Ω, RL2 = 62Ω
ENABLE HIGH, IGN IN TO BATT
1) VOUT1 vs VBATT
2
1
2) VOUT2 vs VBATT
1
0
0
5
15
INPUT VOLTAGE (V)
TA = +25oC, NO LOAD
1) IGN IN TO BATT, ENABLE HIGH,
DATA IN THROUGH 250Ω TO BATT
2) IGN IN AND ENABLE TO GND
14
12
10
8
6
4
2
1
2
0
2.5
20
5
LOW VOLTAGE
DROPOUT
1
2
0.2
0.1
0
NORMAL
OPERATING RANGE
22.5
OVER-VOLTAGE
SHUTDOWN
35
TA = +25oC, RL1 = 100Ω, RL2 = 62Ω
1) BATT TO 16V, ENABLE TO OUT1
0.5 2) BATT TO 11V, ENABLE TO OUT1
3) BATT TO 16V, ENABLE TO GND
4) BATT TO 11V, ENABLE TO GND
0.4
0.3
20
FIGURE 4B. TYPICAL CHARACTERISTICS CURVES FOR NOLOAD BATT INPUT CURRENT vs BATT INPUT
VOLTAGE FOR OFF STATE IDLE CURRENTS
CUR OUT (PIN 9) - OUTPUT (SINK)
CURRENT (mA)
IGN IN - INPUT CURRENT (mA)
FIGURE 4A. TYPICAL CHARACTERISTIC CURVES FOR OUT1
AND OUT2 OUTPUT VOLTAGE vs BATT VOLTAGE
INPUT
10
15
INPUT VOLTAGE (V)
3
4
TA = +25oC, VBATT = 13.5V
30 CUR OUT THROUGH 250Ω TO BATT
ENABLE AND IGN IN TO BATT
25
20
15
TEST NOTE:
MEASUREMENTS MADE
AS VOLTAGE ON 50Ω LOAD
FROM CUR OUT TO 5V
10
5
0
0
5
10
15
IGN IN INPUT VOLTAGE (V)
0
20
0.1
0.2
0.3
0.4
CUR IN (PIN 10) - INPUT (SOURCED) CURRENT (mA)
FIGURE 4C. TYPICAL IGN IN CURRENT vs IGN IN INPUT VOLTAGE
FIGURE 4D. TYPICAL CURRENT MULTIPLIER CURRENT GAIN
CHARACTERISTIC
7-45
TA = +25oC, ENABLE HIGH; IGN IN TO BATT
DATA IN THROUGH 250Ω TO BATT
1) OUT1 = OUT2 = 50Ω
2) OUT1 = 100Ω, OUT2 = 62Ω
3) OUT2 = 62Ω, OUT1 OPEN
4) OUT1 = 100Ω, OUT2 OPEN
1
15
10
5
IOUT1/ IIN AND IOUT2/IIN CURRENT
TRANSFER EFFICIENCIES (mA)
COMMON (GROUND) CURRENT
PINS 4, 5, 12 & 13 (mA)
CA3277
2
3
4
1.00
0.98
0.96
2
0.94
1
0.92
0.90
0
0
5
10
15
INPUT VOLTAGE (V)
20
FIGURE 4E. TYPICAL CHARACTERISTIC CURVES FOR COMMON
(GROUND) CURRENT vs BATT VOLTAGE INPUT
WITH OUTPUT LOAD
TA = +25oC, ENABLE HIGH
IGN IN TO BATT, VBATT = 13.5V
DATA IN THROUGH 250Ω TO BATT
1) IOUT1 VARIED, OUT2 - NO LOAD
2) IOUT2 VARIED, OUT1 - NO LOAD
0
50
100
150
OUTPUT CURRENT (mA)
FIGURE 4F. TYPICAL CHARACTERISTIC CURVES FOR CURRENT
TRANSFER EFFICIENCY OF IOUT1/IIN AND IOUT2/IIN
WHERE IIN INCLUDES (IIGN IN + IDATA IN) BIAS CURRENTS
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
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7-46
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