1
EM MICROELECTRONIC-MARIN SA
A6155
High Efficiency Linear Power Supply with
Extremely Accurate Power Surveillance, Software
Monitoring and Sleep Mode Detection
Features
Can-bus sleep mode detector
Highly accurate 5 V, 100 mA guaranteed output
Low dropout voltage, typically 380 mV at 100 mA
Low quiescent current, typically 155
A
Standby mode, maximum current 350
A (with
100
A load on OUTPUT)
Unregulated DC input can withstand 20 V reverse
battery and + 60 V power transients
Fully operational for unregulated DC input voltage
up to 26 V and regulated output voltage down to 3.0 V
Reset output guaranteed for regulated output voltage
down to 1.2 V
No reverse output current
Very low temperature coefficient for the regulated output
Current limiting
Comparator for voltage monitoring,voltage reference
1.275 V
2.0% voltage reference accuracy at +25
C (3 to 5.5 V)
2.7% voltage reference accuracy from 40 to
+85
C (3 to 5.5 V)
Programmable reset voltage monitoring
Programmable power-on reset (POR ) delay
Watchdog with programmable time windows guarant-
ees a minimum time and a maximum time between
software clearing of the watchdog
Time base accuracy
10%
System enable output offers added security
TTL/CMOS compatible
-40 to +85
C temperature range
DIP8 and SO8 packages
Description
The A6155 offers a high level of integration by combining
voltage regulation, voltage monitoring and software
monitoring in an 8 lead package. The voltage regulator
has a low dropout voltage (typ. 380 mV at 100 mA) and a
low quiescent current (155
A). The quiescent current
increases only slightly in dropout prolonging battery life.
Built-in protection includes a positive transient absorber for
up to 60 V (load dump) and the ability to survive an
unregulated input voltage of 20 V (reverse battery). The
input may be connected to ground or a reverse voltage
without reverse current flow from the output to the input. A
comparator monitors the voltage applied at the V
IN
input
comparing it with an internal 1.275 V reference. The
power-on reset function is initialized after V
IN
reaches
1.275 V and takes the reset output inactive after T
POR
depending of external resistance. The reset output
goes active low when the V
IN
voltage is less than 1.275 V.
The RES and EN outputs are guaranteed to be in a correct
state for a regulated output voltage as low as 1.2 V.
The watchdog function monitors software cycle time
and execution. If software clears the watchdog too
quickly (incorrect cycle time) or too slowly (incorrect
execution) it will cause the system to be reset. The
system enable output prevents critical control
functions being activated until software has
successfully cleared the watchdog three times. Such a
security could be used to prevent motor controls
being energized on repeated resets of a faulty system.
If the microcontroller does not work that means no
signal on the TCL input the A6155 goes in a standby
mode (CAN-bus sleep detector).
Applications
Automotive systems
Cellular telephones
Security systems
Battery powered products
High efficiency linear power supplies
Industrial electronics
Typical Operating Configuration
Pin Assignment
DIP8/ SO8
OUTPUT
Fig. 2
V
IN
R
INPUT
A6155
EN
RES
TCL
V
SS
5 V
Fig. 1
GND
A6155
V
IN
TCL
RES
EN
R
V
SS
INPUT OUTPUT
Unregulat-
ed voltage
2
A6155
Absolute Maximum Ratings
Parameter
Symbol
Conditions
Continuous voltage at INPUT
to V
SS
V
INPUT
-0.3 to + 30 V
Transients on INPUT for
t < 100 ms and duty cycle 1%
V
TRANS
up to + 60 V
Reverse supply voltage on INPUT
V
REV
- 20 V
Max. voltage at any signal pin
V
MAX
OUTPUT + 0.3 V
Min. voltage at any signal pin
V
MIN
V
SS
0.3 V
Storage temperature
T
STO
-65 to + 150 C
Electrostatic discharge max. to
MIL-STD-883C method 3015
V
Smax
1000 V
Max. soldering conditions
T
Smax
250 C x 10 s
Table 1
Stresses above these listed maximum ratings may
cause permanent damage to the device. Exposure be-
yond specified operating conditions may affect device
reliability or cause malfunction.
Handling Procedures
This device has built-in protection against high static
voltages or electric fields; however, anti-static precau-
tions should be taken as for any other CMOS compo-
nent. Unless otherwise specified, proper operation can
only occur when all terminal voltages are kept within the
supply voltage range. At any time, all inputs must be tied
to a defined logic voltage level.
Operating Conditions
Parameter
Symbol
Min. Typ. Max. Units
Operating junction
temperature
1)
T
J
-40
+85
C
INPUT voltage
2)
V
INPUT
2.3
26
V
OUTPUT voltage
2)3)
V
OUTPUT
1.2
V
RES & EN guaranteed
4)
V
OUTPUT
1.2
V
OUTPUT current
5)
I
OUTPUT
100
mA
Comparator input
voltage
V
IN
0
V
OUTPUT
V
RC-oscillator
programming
R
10
1000
k
Thermal resistance from
junction to ambient
6)
-DIP8
R
th(j-a)
105
C/W
-SO8
R
th(j-a)
160
C/W
Table 2
1)
The maximum operating temperature is confimed by
sampling at initial device qualification. In production, all
devices are tested at +85
C.
2)
Full operation quaranteed. To achieve the load regulation
specified in Table 3 a 22
F capacitor or greater is required
on the INPUT, see Fig. 8. The 22
F must have an effective
resistance
5
and a resonant frequency above 500 kHz.
3)
A 10
F load capacitor and a 100 nF decoupling capacitor
are required on the regulator OUTPUT for stability. The
10
F must have an effective series resistance of
5
and
a resonant frequency above 500 kHz.
4)
RES must be pulled up externally to V
OUTPUT
even if it is
unused. (Note: RES and EN are used as inputs by EM
test).
5)
The OUTPUT current will not apply for all possible
combinations of input voltage and output current.
Combinations that would require the A6155 to work above
the maximum junction temperature (+85
C) must be
avoided.
6)
The thermal resistance specified assumes the package is
soldered to a PCB.
3
A6155
Electrical Characteristics
V
INPUT
= 6.0 V, C
L
= 10
F + 100 nF, C
INPUT
= 22
F, T
J
= -40 to +85
C, unless otherwise specified
Parameter
Symbol
Test Conditions
Min. Typ.
Max.
Unit
Supply current in standby mode I
SS
R
EXT
= don't care, TCL = V
OUTPUT
,
(switched to R
INT
)
V
IN
= V
OUTPUT
, I
L
= 100
A
O/P
S
1 M
to V
OUTPUT
350
A
Supply current
1)
I
SS
R
EXT
= 100 k
, I/P
S
at V
OUTPUT
,
O/P
S
1 M
to V
OUTPUT
, I
L
= 100
A
155
400
A
Supply current
1)
I
SS
R
EXT
= 100 k
, I/P
S
at V
OUTPUT
, V
INPUT
=
8.0 V, O/P
S
1 M
to V
OUTPUT
, I
L
= 100 mA
1.7
4.2
mA
Output voltage
V
OUTPUT
I
L
= 100
A
4.88
5.12
V
Output voltage
V
OUTPUT
100
A
I
L
100 mA,
-40
C
T
J
+85
C
4.85
5.15
V
Output voltage temperature
Coefficient
2)
V
th(coeff)
50
180
ppm/
C
Line regulation
3)
V
LINE
6 V
V
INPUT
26 V, I
L
= 1 mA,
T
J
= +85
C
0.2
0.5
%
Load regulation
3)
V
L
100
A
I
L
100 mA
0.2
0.6
%
Dropout voltage
4)
V
DROPOUT
I
L
= 100
A
40
170
mV
Dropout voltage
4)
V
DROPOUT
I
L
= 100 mA
380
mV
Dropout voltage
4)
V
DROPOUT
I
L
= 100 mA, -40
C
T
J
+85
C
650
mV
Dropout supply current
I
SS
V
INPUT
= 4.5 V, I
L
= 100
A,
R
EXT
= 100 k
, O/P
S
1 M
to
V
OUTPUT
, I/P
S
at V
OUTPUT
1.2
1.6
mA
Thermal regulation
5)
V
thr
T
J
= +25
C, I
L
= 50 mA,
V
INPUT
= 26 V, T = 10 ms
0.05
0.25
%/W
Current limit
I
Lmax
OUTPUT tied to V
SS
450
mA
OUTPUT noise, 10Hz to 100kHz V
NOISE
200
Vrms
3.0
V
OUTPUT
5.5 V, I
L
= 100
A, C
L
= 10
F + 100 nF, C
INPUT
= 22
F, T
J
= -40 to +85
C, unless otherwise specified
RES and EN
Output Low Voltage
V
OL
V
OUTPUT
= 4.5 V, I
OL
= 20 mA
0.4
V
V
OL
V
OUTPUT
= 4.5 V, I
OL
= 8 mA
0.2
0.4
V
V
OL
V
OUTPUT
= 2.0 V, I
OL
= 4 mA
0.2
0.4
V
V
OL
V
OUTPUT
= 1.2 V, I
OL
= 0.5 mA
0.06
0.2
V
EN
Output High Voltage
V
OH
V
OUTPUT
= 4.5 V, I
OH
= -1 mA
3.5
4.1
V
V
OH
V
OUTPUT
= 2.0 V, I
OH
= -100
A
1.8
1.9
V
V
OH
V
OUTPUT
= 1.2 V, I
OH
= -30
A
1.0
1.1
V
TCL and V
IN
TCL Input Low Level
V
IL
V
SS
0.8
V
TCL Input High Level
V
IH
2.0
V
OUTPUT
V
Leakage current TCL input
I
LI
V
SS
V
TCL
V
OUTPUT
0.05
1
A
V
IN
input resistance
R
VIN
100
M
Comparator reference
6)7)
V
REF
T
J
= +25
C
1.25 1.275
1.30
V
V
REF
1.24
1.31
V
Comparator hysteresis
7)
V
HY
2
mV
1)
If INPUT is connected to V
SS
, no reverse current will flow from the OUTPUT to the INPUT, however the supply
Table 3
current specified will be sank by the OUTPUT to supply the A6155.
2)
The OUTPUT voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
3)
Regulation is measured at constant junction temperature using pulse testing with a low duty cycle. Changes in OUTPUT voltage
due to heating effects are covered in the specification for thermal regulation.
4)
The dropout voltage is defined as the INPUT to OUTPUT differential, measured with the input voltage equal to 5.0 V.
5)
Thermal regulation is defined as the change in OUTPUT voltage at a time T after a change in power dissipation is applied,
excluding load or line regulation effects.
6)
The comparator and the voltage regulator have separate voltage references (see " Block Diagram" Fig. 8).
7)
The comparator reference is the power-down reset threshold. The power-on reset threshold equals the comparator reference
voltage plus the comparator hysteresis (see Fig. 5).
4
A6155
Timing Characteristics
V
INPUT
= 6.0 V, I
L
= 100
A, C
L
= 10
F + 100 nF, C
INPUT
= 22
F, T
J
= -40 to + 85
C, unless otherwise specified
Parameter
Symbol Test Conditions
Min.
Typ.
Max.
Units
Propagation delays:
TCL to Output Pins
T
DIDO
250
500
ns
V
IN
sensitivity
T
SEN
1
5
20
s
Logic Transition Times on all Output Pins T
TR
Load 10 k
, 50 pF
30
100
ns
Power-on Reset delay
T
POR
R
EXT
= 110 k
,
1%
90
100
110
ms
Watchdog Time
T
WD
R
EXT
= 110 k
,
1%
90
100
110
ms
Open Window Percentage
OWP
0.2 T
WD
Closed Window Time
T
CW
0.8 T
WD
T
CW
R
EXT
= 110 k
,
1%
72
80
88
ms
Open Window Time
T
OW
0.4 T
WD
T
OW
R
EXT
= 110 k
,
1%
36
40
44
ms
Watchdog Reset Pulse
T
WDR
T
WD
/40
T
WDR
R
EXT
= 110 k
,
1%
2.5
ms
T
CL
Input Pulse Width
T
TCL
150
ns
Reset Pulse when switched to R internal
T
RI
0.3
0.9
2.3
s
Watchdog Reset Pulse with R internal (R
I
) T
RIR
T
RI
/320
s
Table 4
T
RI
versus Temperature at V
OUTPUT
= 5 V
Timing Waveforms
Watchdog Timeout Period
2.5
2.0
1.5
1.0
0.5
0
T
RI
[s]
-40
+25
+85
+125
T
J
[
C]
Fig.3
T
WD
= T
POR
T
CW
closed window
T
OW
open window
Watchdog
timer reset
Condition:
R
EXT
= 110 k
- OWP
- 20%
+ OWP
+ 20%
80
100
120
Fig. 4
t [ms]
5
A6155
Voltage Monitoring
Timer Reaction
Combined Voltage and Timer Reaction
T
SEN
T
SEN
T
SEN
T
SEN
T
POR
T
POR
RES
V
IN
V
REF
V
HY
Conditions:
V
OUTPUT
3 V
No timeout
Fig. 5
T
CW
+T
OW
T
OW
V
IN
V
REF
TCL
RES
EN
Condition:
V
OUTPUT
3 V
- Watchdog timer reset
TCL
too early
3 correct TCL services
EN goes active low
1
2
3
T
POR
=T
WD
T
CW
T
RI
T
RIR
After 3 reset pulse periods
switch to R internal
Fig. 7
T
TCL
T
CW
+ T
OW
- Watchdog timer reset
Conditions: V
IN
> V
REF
after power-up sequence
TCL
RES
3 correct TCL services
EN goes active low
1
2
3
Timeout
T
CW
+T
OW
T
CW
+ T
OW
T
CW
+ T
OW
T
CW
T
CW
+ T
OW
T
RI
T
WDR
T
RIR
T
CW
T
OW
T
WDR
After 3 reset pulse
periods
switch to R internal
After one edge (falling or rising)
on TCL input
switch to R input
Fig. 6
EN
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