MOTOROLA TCF5600

Order this document by TCA5600/D
The TCA5600, TCF5600 are versatile power supply control circuits for
microprocessor based systems and are mainly intended for automotive
applications and battery powered instruments. To cover a wide range of
applications, the devices offer high circuit flexibility with a minimum of
external components.
Functions included in this IC are a temperature compensated voltage
reference, on–chip dc/dc converter, programmable and remote controlled
voltage regulator, fixed 5.0 V supply voltage regulator with external PNP
power device, undervoltage detection circuit, power–on RESET delay and
watchdog feature for safe and hazard free microprocessor operations.
• 6.0 V to 30 V Operation Range
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UNIVERSAL
MICROPROCESSOR POWER
SUPPLY/CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
2.5 V Reference Voltage Accessible for Other Tasks
Fixed 5.0 V ± 4% Microprocessor Supply Regulator Including Current
Limitation, Overvoltage Protection and Undervoltage Monitor.
Programmable 6.0 V to 30 V Voltage Regulator Exhibiting High Peak
Current (150mA), Current Limiting and Thermal Protection.
Two Remote Inputs to Select the Regulator’s Operation Mode:
OFF = 5.0 V, 5.0 V Standby
Programmable Output Voltage
Self–Contained dc/dc Converter Fully Controlled by the Programmable
Regulator to Guarantee Safe Operation Under All Working Conditions
Programmable Power–On RESET Delay
18
1
PLASTIC PACKAGE
CASE 707
Watchdog Select Input
PIN CONNECTIONS
Negative Edge Triggered Watchdog Input
Low Current Consumption in the VCC1 Standby Mode
RESET
1
18 WDS
Vout1 Sense
2
17 Delay
VCC1
3
16 Iout1 Sense
High Voltage Crystal and Plasma Displays
WDI
4
15 Base Drive
Decentralized Power Supplies in Computer Telecom Systems
Vref
5
14 VCC2
INH1
6
13 GND
Vout2 Prog
7
12 Current Sense
Vout2 Output
8
11 INH2
Converter Output
9
10 Converter Input
All Digital Control Ports are TTL and MOS–Compatible
Applications Include:
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Microprocessor Systems with E2PROMs
(Top View)
RECOMMENDED OPERATING CONDITIONS
Characteristics
Power Supply Voltage
Collector Current
Output Voltage
Reference Source Current
Symbol
Min
Max
Unit
VCC1
VCC2
5.0
5.5
30
30
V
IC
—
800
mA
Vout2
6.0
30
V
Device
Iref
0
2.0
mA
ORDERING INFORMATION
Operating
Temperature Range
Package
TCA5600
TJ = 0° to +125°C
Plastic DIP
TCF5600
TJ = – 40° to +150°C
Plastic DIP
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Rev 0
1
TCA5600 TCF5600
MAXIMUM RATINGS (TA = +25°C [Note 1], unless otherwise noted.)
Rating
Symbol
Value
Unit
VCC1, VCC2
35
Vdc
Base Drive Current (Pin 15)
IB
20
mA
Collector Current (Pin 10)
IC
1.0
A
Forward Rectifier Current (Pin 10 to Pin 9)
IF
1.0
A
Logic Inputs INH1, INH2, WDS
(Pin 6, 11, 18)
VINP
–0.3 V to VCC1
Vdc
Logic Input Current WDI (Pin 4)
IWDI
±0.5
mA
Output Sink Current RESET (Pin 1)
IRES
10
mA
–0.3 to 10
–0.3 to 5.0
V
5.0
mA
Power Supply Voltage (Pin 3,14)
Analog Inputs (Pin 2)
Analog Inputs (Pin 7)
Reference Source Current (Pin 5)
Iref
Power Dissipation (Note 2)
TA = +75°C TCA5600
TA = +85°C TCF5600
PD
mW
500
650
RθJA
Thermal Resistance, Junction–to–Air
Operating Ambient Temperature Range
TCA5600
TCF5600
TA
Operating Junction Temperature Range
TCA5600
TCF5600
TJ
°C/W
100
°C
0 to +75
–40 to +85
°C
+125
+150
Storage Temperature Range
Tstg
–65 to +150
°C
NOTES: 1. Values beyond which damage may occur.
2. Derate at 10 mW/°C for junction temperature above +75°C (TCA5600).
Derate at 10 mW/°C for junction temperature above +85°C (TCF5600).
12
8
DC/DC
Converter
Inhibit 2 11
(INH2)
14
Current
Sense
7
Supply
Voltage V CC2
Regulator
Vout2
9
V out2
Programming
10
Current
Sense
Converter
Output
Converter
Input
Representative Block Diagram
16
Current
Limit
A2
Voltage
Protection
Inhibit 1 6
(INH1)
A1
15
2
Supply
Voltage VCC1
3
Reference
2.5V
Thermal
Shut–Down
PNP Base Drive
Vout1 Sense
A1
1
Delay Circuit
Watchdog
Comp. II
Comp. I
2
5
13
Gnd
4
WDI
18
WDS
Delay
17
Vref
RESET
MOTOROLA ANALOG IC DEVICE DATA
TCA5600 TCF5600
ELECTRICAL CHARACTERISTICS (VCC1 = VCC2 = 12 V; TJ = 25°C; Iref = 0; Iout1 = 0 [Note 3]; RSC = 0.5 Ω; INH = High
INH2 = High; WDS = High; Iout2 = 0 [Note 4]; unless otherwise noted.)
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
1
Vref nom
2.42
2.5
2.58
V
Vref
2.4
—
2.6
V
Regline
—
2.0
15
mV
REFERENCE SECTION
Nominal Reference Voltage
Reference Voltage
Iref = 0.5 mA, Tlow ≤ TJ ≤ Thigh (Note 5), 6.0 V ≤ VCC1 ≤ 18 V
Line Regulation (6.0 V ≤ VCC2 ≤ 18 V)
Average Temperature Coefficient
Tlow ≤ TJ ≤ Thigh (Note 5)
2
∆Vref
∆TJ
—
—
± 0.5
mV/°C
Ripple Rejection Ratio
f = 1.0 kHz, Vsin = 1.0 Vpp
3
RR
60
70
—
dB
ZO
—
1.0
—
Ω
ICC1
—
3.0
—
mA
Vout1(nom)
4.8
5.0
5.2
V
Vout1
4.75
—
5.25
V
Line Regulation (6.0 V ≤ VCC2 ≤ 18 V)
Regline
—
10
50
mV
Load Regulation (5.0 mA ≤ Iout1 ≤ 300 mA)
Regload
—
20
100
mV
IB
10
15
—
mA
Output Impedance
0 ≤ Iref ≤ 2.0 mA
Standby Current Consumption
VCC2 = Open
4
5.0 V MICROPROCESSOR VOLTAGE REGULATOR SECTION
Nominal Output Voltage
Output Voltage
5.0 mA ≤ Iout1 ≤ 300 mA, Tlow ≤ TJ ≤ Thigh (Note 5)
6.0 V ≤ VCC2 ≤ 18 V
5
6
Base Current Drive (VCC2 = 6.0 V, V15 = 4.0 V)
Ripple Rejection Ratio
f = 1.0 kHz, Vsin = 1.0 Vpp
3
RR
50
65
—
dB
Undervoltage Detection Level (RSC = 5.0 Ω)
7
Vlow
4.5
0.93 × Vout1
—
V
Current Limitation Threshold (RSC = 5.0 Ω)
VRSC
210
250
290
mV
Average Temperature Coefficient
Tlow ≤ TJ ≤ Thigh (Note 5)
∆Vout1
∆TJ
—
—
±1.0
mV/°C
DC/DC CONVERTER SECTION
Collector Current Detection Level High
RC = 10 k
Low
9
V12(H)
V12(L)
350
—
400
50
450
—
mV
Collector Saturation Voltage
IC = 600 mA (Note 6)
10
VCE(sat)
—
—
1.6
V
Rectifier Forward Voltage Drop
IF = 600 mA (Note 6)
11
VF
—
—
1.4
V
NOTES: 3. The external PNP power transistor satisfies the following minimum specifications:
hFE ≥ 60 at IC = 500 mA and VCE = 5.0 V;
VCE(sat) ≤ 300 mV at IB = 10 mA and IC = 300 mA
4. Regulator Vout2 programmed for nominal 24 V output by means of R4, R5 (see Figure 1).
5. Tlow = 0°C for TCA5600
Tlow = –40°C for TCF5600
Thigh = +125°C for TCA5600
Thigh = +150°C for TCF5600
6. Pulse tested tp ≤ 300 µs.
MOTOROLA ANALOG IC DEVICE DATA
3
TCA5600 TCF5600
ELECTRICAL CHARACTERISTICS (VCC1 = VCC2 = 12 V; TJ = 25°C; Iref = 0; Iout1 = 0 [Note 3]; RSC = 0.5 Ω; INH = High
ELECTRICAL CHARACTERISTICS INH2 = High; WDS = High; Iout2 = 0 [Note 4]; unless otherwise noted.)
Characteristics
Symbol
Min
Typ
Max
Unit
Vout2(nom)
23
24
25
V
Vout2
22.8
—
25.2
V
Regload
—
40
200
mV
Iout2
100
—
—
mA
Iout2 p
150
200
—
mA
RR
45
55
—
dB
Vout2(5.0 V)
4.75
—
5.25
V
Rout1
—
10
—
kΩ
∆Vout2
∆TJVout2
—
—
±0.25
mV/°C V
VC5(H)
VC5(L)
—
—
2.5
1.0
—
—
V
–1.8
—
—
–2.5
5×IC5
–50×IC5
–3.2
—
—
VWDI
—
—
±5.5
V
Watchdog Input Impedance
ri
12
15
—
kΩ
Watchdog Reset Pulse Width (C8 = 1.0 nF) (Note 9)
tp
—
—
10
µs
VINP
—
—
–0.3 to VCC1
V
—
—
—
—
100
150
—
—
–100
PROGRAMMABLE VOLTAGE REGULATOR SECTION (Note 6)
Nominal Output Voltage
Output Voltage (Figure 8)
1.0 mA ≤ Iout2 ≤ 100 mA, Tlow ≤ TJ ≤ Thigh (Notes 5, 7)
Load Regulation 1.0 mA ≤ Iout2 ≤ 100 mA (Note 7)
DC Output Current
Peak Output Current (Internally Limited)
Ripple Rejection Ratio
f = 20 kHz, V = 0.4 Vpp
Output Voltage (Fixed 5.0 V)
1.0 mA ≤ Iout2 ≤ 20 mA, Tlow ≤ TJ ≤ Thigh
INH1 = HIGH (Note 5)
Off State Output Impedance (INH2 = Low)
Average Temperature Coefficient
Tlow ≤ TJ ≤ Thigh (Note 5)
WATCHDOG AND RESET CIRCUIT SECTION
Threshold Voltage
(Static)
High
Low
Current Source Tlow ≤ TJ ≤ Thigh (Note 5)
Power–Up RESET
Watchdog Time Out
Watchdog RESET
Watchdog Input Voltage Swing
µA
IC5
DIGITAL PORTS: WDS, INH 1, INH 2, RESET (Note 8)
Input Voltage Range
µA
Input High Current
2.0 V ≤ VIH ≤ 5.5 V
5.5 V ≤ VIH ≤ VCC1
IIH
Input Low Current
–0.3 V ≤ VIL ≤ 0.8 V for INH1, INH2, –0.3 V ≤ VIL ≤ 0.4 V for WDS
IIL
Leakage Current Immunity (INH2, High “Z” State) (Figure 12)
IZ
±20
—
—
µA
Output Low Voltage RESET (IOL = 6.0 mA)
VOL
—
—
0.4
V
Output High Voltage RESET (VOH = 5.5 V)
VOH
—
—
20
µA
µA
NOTES: 3. The external PNP power transistor satisfies the following minimum specifications:
hFE ≥ 60 at IC = 500 mA and VCE = 5.0 V;
VCE(sat) ≤ 300 mV at IB = 10 mA and IC = 300 mA
4. Regulator Vout2 programmed for nominal 24 V output by means of R4, R5 (see Figure 1).
5. Tlow = 0°C for TCA5600
Tlow = –40°C for TCF5600
Thigh = +125°C for TCA5600
Thigh = +150°C for TCF5600
6. V9 = 28 V, INH1 = LOW for this Electrical Characteristic section unless otherwise noted.
7. Pulse tested tp ≤ 300 µs.
8. Temperature range Tlow ≤ TJ ≤ Thigh applies to this Electrical Characteristics section.
9. For test purposes, a negative pulse is applied to Pin 4 (–2.5 V ≥ V4 ≥ –5.5 V).
4
MOTOROLA ANALOG IC DEVICE DATA
TCA5600 TCF5600
V ref nom , REFERENCE VOLTAGE (V)
Figure 1. Reference Voltage versus Supply Voltage
2.4
2.0
RSC
0.5Ω
NC
VCC1
6
+
11
18
9
10
14
3
1.6
1.2
NC
12
NC
4
16
Q1
BD242SP
15
17
13
8
7
1 2
5
Vout1
0.8
NC
0.4
0
1.0
NC
R4
86k
Vout2
10µF
C4
Vref nom
R5
10k
2.0 3.0 4.0 5.0
10
20 30 40
VCC1, SUPPLY VOLTAGE (V)
+
Figure 2. Reference Stability versus Temperature
TCA5600
∆ V ref , VOLTAGE DRIFT (mV)
60
40
6
+
20
+0
–20
–50
11
18
NC
12
NC
4
13
8
NC
125
7
14
16
Q1
BD242SP
1 2
Vout1
+
10µF
∆Vref
R5
10k
150
5
NC
R4
86k
Vout2
TCF5600
0
25
50
75
100
TJ, JUNCTION TEMPERATURE (°C)
9
15
17
–25
10
3
–40
–60
RSC
0.5Ω
NC
VCC1
C4
+
Vref nom
Figure 3. Ripple Rejection versus Frequency
RR, RIPPLE REJECTION RATIO (dB)
Ω = 1.0 VPP
70
0.33µF
Vref
60
50
Vout1
40
30
VCC1
20
11
10 k
100 k
f,FREQUENCY (Hz)
MOTOROLA ANALOG IC DEVICE DATA
1.0 M
18
10
9
14
3
NC
12
NC
4
17
16
Q1
BD242SP
15
13
Vout2
0
1.0 k
6
NC
10
RSC
0.5Ω
NC
C6
R3
+ 150Ω
8
7
R4
86k
R5
10k
5
1 2
NC
Vout1
+
10µF
C4
Vref nom
5
TCA5600 TCF5600
ICC1 , STAND–BY CURRENT (mA)
Figure 4. Standby Current versus Supply Voltage
6
VCC1
ICC1
5
6
+
11
18
3
NC
12
NC
4
17
2
9
14
13
8
7
Q1
BD242SP
1 2
5
NC
R4
86k
Vout2
0
16
15
NC
1
2.0
10
3
4
1.0
RSC
0.5Ω
NC
10µF
C4
Vref
R5
10k
3.0 4.0 5.0
10
20 30 40
VCC1, SUPPLY VOLTAGE (IV)
Vout1
+
Figure 5. Power–Up Behavior of the 5.0 V Regulator
V out1 , OUTPUT VOLTAGE (V)
6
5
4
6
+
Iout = 300 mA
11
18
NC
12
NC
4
17
2
9
14
13
8
7
5
R4
86k
Vout2
0
16
Q1
BD242SP
15
NC
1
2.0
10
3
3
1.0
RSC
0.5Ω
NC
VCC1
Vref
R5
10k
3.0 4.0 5.0
10
20 30 40
VCC2, SUPPLY VOLTAGE (IV)
1 2
Iout1
NC
16.7Ω
Rout1
Vout1
+
C4
10µF
Figure 6. Foldback Characteristics of the 5.0 V Regulator
V CC2 , SUPPLY VOLTAGE (V)
7.0
6
+
5.0
NC
12
3.0
NC
4
28 V
24 V
VCC1
0
100
200
300
400
500 600
Iout1, OUTPUT CURRENT (mA)
18
10
9
+
14
16
Q1
BD242SP
15
13
NC
Vout2
0
6
17
VCC2 ≤ 20 V
1.0
11
3
4.0
2.0
RSC
0.5Ω
NC
VCC1
6.0
8
7
5
NC
Rout1
R4
86k
R5
10k
1 2
Iout1
100Ω
Vout1
+
C4
10µF
Vref
MOTOROLA ANALOG IC DEVICE DATA
TCA5600 TCF5600
Figure 7. Undervoltage Lockout Characteristics
V RES , RESET VOLTAGE (V)
7
6
6
+
11
18
4
3
NC
12
NC
4
2
13
8
NC
1
0
3.0
4.0
5.0
6.0
7.0
7
16
Q1
BD242SP
1 2
Vout1
+
C4
10µF
10k
Vref RESET
R5
10k
8.0
5
R6
R4
86k
Vout2
2.0
14
15
17
1.0
9
10
3
5
0
RSC
0.5Ω
NC
VCC1
Vout1, OUTPUT VOLTAGE (V)
Figure 8. Output Current Capability of the Programming Regulator
V g , SUPPLY VOLTAGE (V)
28
RSC
0.5Ω
NC
24
6
+
20
V9
16
11
18
12
+
8.0
VCC1
NC
12
NC
4
13
8
NC
0
40
60
80
100
120
Iout2, OUTPUT CURRENT (mA)
140
Rout2
5.0k
160
7
5
14
16
Q1
BD242SP
Vout1
+
10µF
C4
Vref
R5
10k
C3
47nF
1 2
NC
R4
86k
Iout2
20
9
15
17
4.0
0
10
3
V 10, COLLECTOR VOLTAGE (V)
Figure 9. Collector Current Detection Level
16
6
+
12
VCC1
NC
8.0
3
V12(L)
V12(H)
V12
0
100
200
300
400
V12, CURRENT SENSE VOLTAGE (mV)
MOTOROLA ANALOG IC DEVICE DATA
500
14
16
Q1
BD242SP
4
13
NC
Vout2
0
RSC
0.5Ω
15
12
17
4.0
11
10k RC
V10
18
10 9
8
7
5
NC
R4
86k
R5
10k
1 2
Vout1
+
10µF
C4
Vref
7
TCA5600 TCF5600
Figure 10. Power Switch Characteristics
VCE(sat), SATURATION VOLTAGE (V)
IC10
1.8
RSC
0.5Ω
1.6
1.4
6
VCC1
+
11
1.0
NC
13
8
7
NC
50
80 100
200 300 500
14
16
Q1
BD242SP
15
17
30
9
4
0.8
20
10
3
12
1.2
0.6
10
18
IC10, COLLECTOR CURRENT (mA)
Vout1
+
NC
R4
86k
Vout2
800
1 2
5
10µF
C4
Vref
R5
10k
Figure 11. Rectifier Characteristics
IF
VF, FORWARD VOLTAGE (V)
1.8
RSC
0.5Ω
1.6
1.4
6
VCC1
+
11
1.0
NC
12
NC
4
13
8
7
NC
30
50 80 100
200 300
IF, RECTIFIER CURRENT (mA)
9
14
16
Q1
BD242SP
15
17
0.8
20
10
3
1.2
0.6
10
18
Vout1
+
NC
R4
86k
Vout2
500 800
1 2
5
10µF
C4
Vref
R5
10k
Vout2 , OUTPUT VOLTAGE (V)
Figure 12. INH 2 Leakage Current Immunity
28
10k
V10
Vout2
24
20
16
Spec Limits
12
High “Z” State
NC
IZ
8
V10
–30
–20
–10
0
10
20
IZ, LEAKAGE CURRENT (µA)
30
40
18
10
9
14
13
NC
Vout2
C3
47nF
8
7
5
Q1
BD242SP
R5
10k
1 2
NC
R4
86k
Vg
16
15
4
17
4.0
11
RSC
0.5Ω
3
12
VCC1
8.0
0
–40
6
+
RC
Vout1
+
10µF
C4
Vref
MOTOROLA ANALOG IC DEVICE DATA
TCA5600 TCF5600
APPLICATIONS INFORMATION
(See Figure 18)
DC/DC Converter
The dc/dc converter performs according to the flyback
principle and does not need a time base circuit. The
maximum coil current is well defined by means of the current
sensing resistor R1 under all working conditions (startup
phase, circuit overload, wide supply voltage range and
extreme load current change). Figure 13 shows the Simplified
Converter Schematic.
Coil
Voltage
VCC2
ÉÉ
ÉÉ
ÉÉ
ÉÉÉ
ÉÉ
ÉÉÉ
VL +
Figure 14. Voltage and Current Waveform
on the Coil (not to scale)
VL –
Voltage Reference (Vref)
The voltage reference Vref is based upon a highly stable
bandgap voltage reference and is accessible on Pin 5 for
additional tasks. This circuit part has its own supply
connection on Pin 3 and is, therefore, able to operate in
standby mode. The RC network R3, C6 improves the ripple
rejection on both regulators.
t
Coil
Current
ILpeak
t
t1
t2
Figure 13. Simplified Converter Schematic
The coil charging time t1 is found using Equation (4):
VCC2
L1
300µH
Control Feedback
V12(H)
V12(L)
+
t1 =
10
VF
Comp
Prog.
Regulator
VCE(sat)
C2
12
9
Vout2
8
7
R4
85K
R5
10k
+
100 µF
C3
47nF
(4)
[f : minimum oscillation frequency which should be chosen
above the audio frequency band (e.g. 20 kHz)]
Knowing the dc output current Iout2 of the programmable
regulator, the peak coil current IL(peak) can now be calculated:
IL(peak) = 2 ⋅ (Iout2) (1 + α)
C7
0.22µF
R1
0.68Ω
1
1
(1 + α ) ⋅ f
(5)
The coil inductance L1 of the nonsaturated coil is given by
Equation (6):
A simplified method on “how to calculate the coil inductance”
is given below. The operation point at minimum supply
voltage (VCC2) and max. output current (Iout2) for a fixed
output voltage (Vout2) determines the coil data. Figure 14
shows the typical voltage and current waveforms on the coil
L1 (coil losses neglected).
Equations (1) and (2) yield the respective coil voltage
VL – and VL + (see Figure 14):
VL+ = Vout2 + ∆V(Pin 9 – Pin 8) + VF – VCC2
VL– = VCC2 – VCE(sat) – V12(H)
(1)
(2)
[∆V(Pin 9 – Pin 8): input/output voltage drop of the regulator,
2.5 V typical]
L1 =
t1
(VL–)
IL(peak)
(6)
The formula (6a) yields the current sensing resistor R1 for a
defined peak coil current IL(peak):
R1 =
V12(H)
IL(peak)
(6a)
In order to limit the by–pass current through capacitor C7
during the energy dumping phase the value C2>>C7 should
be implemented.
For all other operation conditions, the feedback signal from
the programmable voltage regulator controls the activity of
the converter.
[VF, VCE(sat), V12(H): see Electrical Characteristics Table]
The time ratio α for the charging time to dumping time is
defined by Equation (3):
α=
t1
VL+
=
t2
VL–
MOTOROLA ANALOG IC DEVICE DATA
(3)
9
TCA5600 TCF5600
Programmable Voltage Regulator
This series voltage regulator is programmable by the
voltage divider R4, R5 for a nominal output voltage of 6.0 V ≤
Vout2 ≤ 30 V.
(Vout2 – Vref nom) • R5
Vref nom
[R5 = 10 k, Vref nom = 2.5 V]
R4 =
(7)
Current limitation and thermal shutdown capability are
standard features of this regulator. The voltage drop
∆V(Pin 9 – Pin 8) across the series pass transistor generates
the feedback signal to control the dc/dc converter
(see Figure 13).
Control Inputs INH1, INH2
The dc/dc converter and/or the regulator Vout2 are remote
controllable through the TTL, MOS compatible inhibit inputs
INH1 and INH2 where the latter is a three–level detector
(Logic “0”, High Impedance “Z”, Logic “1”). Both inputs are
set–up to provide the following truth table:
Figure 15. INH1, INH2 TruthTable
INT:
ON:
OFF:
Mode
INH1
INH2
Vout2
DC/DC
1
2
3
4
5
6
0
0
0
1
1
1
0
High “Z”
1
0
High “Z”
1
OFF
Vout2
Vout2
OFF
5.0 V
5.0 V
INT
ON
INT
INT
ON
INT
RSC =
VRSC
IE
(8)
[IE: emitter current of Q1]
[VRSC: threshold voltage
[VRSC: (see Electrical Characteristics Table)]
The voltage protection circuit performs a foldback
characteristic above a nominal operating voltage, VCC2 ≥
18 V.
Delay and Watchdog Circuit
The undervoltage monitor supervises the power supply
Vout1 and releases the delay circuit RESET as soon as the
regulator output reaches the microprocessor operating a
range [e.g., Vlow 0.93 • Vout1(nom)]. The RESET output has
an open–collector and may be connected in a “wired–OR”
configuration.
The watchdog circuit consists of a retriggerable
monostable with a negative edge sensitive control input WDI.
The watchdog feature may be disabled by means of the
watchdog select input WDS driven to a “1”. Figure 17 displays
the Typical RESET Timing Diagram.
The commuted current source IC5 on Pin 17, threshold
voltage VC5(L), VC5(H) and an external capacitor C5 define
the RESET delay and the watchdog timing. The relationship
of the timing signals are indicated by the Equations (9) to (11).
w
Intermittent operation of the converter means that the
converter operates only if VCC2<Vout2.
The converter loads the storage capacitor C2 to its full
charge (V9 = 33 V), allowing fast response time of the
regulator Vout2 when addressed by the control software.
High impedance (internal resistor 10 k to ground)
Figure 16 represents a typical timing diagram for an E2PROM
programming sequence in a microprocessor based system.
The High “Z” state enables the dc/dc converter to ramp during
t3 to the voltage V9 at Pin 9 to a high level before the write
cycle takes place in the memory.
Figure 16. Typical E2PROM Programming Sequence
(not to scale)
V9
VCC2 – VF
Microprocessor Supply Regulator
Together with an external PNP power transistor (Q1), a
5.0 V supply exhibiting low voltage drop is obtained to power
microprocessor systems and auxiliary circuits. Using a power
Darlington with adequate heat sink in the output stage boosts
the output current Iout1 above 1.0 A.
The current limitation circuit measures the emitter current
of Q1 by means of the sensing resistor, RSC:
V9 max
RESET delay:
td =
C5 • VC5(H)
|IC5|
Watchdog timeout:
twd =
Watchdog RESET:
tr =
C5 • (VC5(H) – VC5(L))
5 • IC5
C5 • (VC5(H) – VC5(L))
50 • |IC5|
(9)
(10)
(11)
V9 int
t3
t4
[IC5, VC5(H), VC5(L): see Electrical Characteristics Table]
t
Programming
Voltage VPP
Vout2
5.0V
INH1
“1”
”0”
INH2
“1”
“0”
10
High “Z”
MOTOROLA ANALOG IC DEVICE DATA
TCA5600 TCF5600
Figure 17. Typical RESET Timing Diagram (not to scale)
VCC2 < Vout1
VCC2
Overload
Vout1
VC5(N)
(a)
VC5
RESET
td
twd
VC5(H)
VC5(L)
VC5
tr
WDI
(b)
RESET
(a) Watchdog inhibited, WDS = “1”
(b) Watchdog operational, WDS = “0”
Figure 18. Typical Automative Application
D1
MR752
Ignition
Key
Vbat
Vout2
C1
220µF +
Z1
MR2525L
R3
150Ω
10
INH
2 11
µP
100µF
C2
300
µH
L1 R1
0.68 Ω
VD
9
12
86k
0.22µF
C7
R5
10k
R4
+
C3
47
nF
24V
50mA
R2
0.5Ω
VCC2
8
7
DC/DC
Converter
16
14
Current
Limit
A2
Voltage
Protection
C9
22nF
Q1*
6
µP
A1
INH
1
2
TCA5600
VCC1
Reference
2.5V
3
BD242SP
Vout1
5.0V/300mA
Thermal
Shut–Down
A1
C6
0.33µF
15
150µF +
C4
1
Delay
Circuit
RESET
µP
17
Watchdog
18
WDS
IC 5
4
WDI
C5
100nF
C8
330pF
5
Vref
13
Gnd
µP
MOTOROLA ANALOG IC DEVICE DATA
11
TCA5600 TCF5600
OUTLINE DIMENSIONS
PLASTIC PACKAGE
CASE 707–02
ISSUE C
18
10
B
1
9
A
L
C
N
F
H
D
K
SEATING
PLANE
G
M
J
NOTES:
1. POSITIONAL TOLERANCE OF LEADS (D),
SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM
MATERIAL CONDITION, IN RELATION TO
SEATING PLANE AND EACH OTHER.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MILLIMETERS
MIN
MAX
22.22
23.24
6.10
6.60
3.56
4.57
0.36
0.56
1.27
1.78
2.54 BSC
1.02
1.52
0.20
0.30
2.92
3.43
7.62 BSC
0_
15_
0.51
1.02
INCHES
MIN
MAX
0.875
0.915
0.240
0.260
0.140
0.180
0.014
0.022
0.050
0.070
0.100 BSC
0.040
0.060
0.008
0.012
0.115
0.135
0.300 BSC
0_
15 _
0.020
0.040
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
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and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola
was negligent regarding the design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
How to reach us:
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P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454
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51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
12
◊
*TCA5600/D*
MOTOROLA ANALOG IC DEVICE
DATA
TCA5600/D