1
EM MICROELECTRONIC-MARIN SA
A6300
High Efficiency Linear Power Supply with
Power Surveillance and Time-out
Features
Supply voltage monitoring
Highly accurate 5 V, 100 mA guaranteed output
Low dropout voltage, typically 380 mV at 100 mA
Low quiescent current, typically 100
A
Standby mode, maximum current 310
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 1 V
Reset output guaranteed for regulated output voltage
down to 1 V
No reverse output current
Very low temperature coefficient for the regulated output
Current limiting
Clear microprocessor restart after power up
Push-pull or Open drain output
-40 to +85
C temperature range
DIP8 and SO8 packages
Description
The A6300 offers a high level of integration by combining
voltage regulation and voltage monitoring. The voltage
regulator has a low dropout ( typ. 380 mV at 100 mA )
and a low quiescent current (100
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. Upon the OUTPUT voltage rising
above V
TH
, the reset output, whether RES or RES, will
remain active (RES = 1, RES = 0) for an additional time
of 50 ms. This allows the system voltage and the
oscillator of the microprocessor to stabilize before they
becomes fully active. When V
OUTPUT
falls below V
TH
, the
reset output goes active. Threshold voltage can be
obtained in different versions: 2 V, 2.4 V, 2.8 V, 3.5 V, 4 V.
Applications
White / brown goods
Industrial electronics
Automotive electronics
Cellular telephones
Security systems
Battery powered products
High efficiency linear power supplies
Typical Operating Configuration
Pin Assignment
DIP8/ SO8
OUTPUT
Fig. 2
N.C.
N.C.
INPUT
A6300
RES or RES
V
SS
N.C.
N.C.
5 V
Fig. 1
RES
V
SS
INPUT OUTPUT
A6300
Unregulated
Voltage
V
SS
Regulated
Voltage
For Open drain version:
2
A6300
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 must be taken as for any other CMOS component.
Unless otherwise specified, proper operation can only
occur when all terminal voltages are kept within the
supply voltage range. Unused inputs must always be
tied to a defined logic voltage level.
Operating Conditions
Parameter
Symbol Min. Typ. Max. Units
Operating junction
temperature
1)
T
J
-40
+125
C
INPUT voltage
2)
V
INPUT
2.3
26
V
OUTPUT voltage
2)3)
V
OUTPUT
1.0
V
Reset output guaranteed
V
OUTPUT
1.0
V
OUTPUT current
4)
I
OUTPUT
100
mA
Thermal resistance from
junction to ambient
5)
- DIP8
R
th(j-a)
105 C/W
- SO8
R
th(j-a)
160 C/W
Table 2
1)
The maximum operating temperature is confirmed by
sampling at initial device qualification. In
production, all devices are tested at + 85
C.
2)
Full operation quaranteed. To achieve the load regu-
lation specified in Table 3 a 22
F capacitor or
greater is required on the INPUT, see Fig. 6. 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 capa-
citor 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)
The OUTPUT current will not apply for all possible
combinations of input voltage and output current.
Combinations that would require the A6300 to work
above the maximum junction temperature (+125
C )
must be avoided.
5)
The thermal resistance specified assumes the
package is soldered to a PCB.
3
A6300
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.
Min.
25C
Typ.
Max.
25C
Max.
Unit
Supply current
I
SS
Reset output open, I
L
= 100 A
100
310
A
Supply current
1)
I
SS
Reset output open, I
L
= 100 mA
at V
INPUT
= 8.0 V
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
+125 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
= +125 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
+125 C
650
mV
Dropout supply current
I
SS
V
INPUT
= 4.5 V, I
L
= 100 A
8)
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
100 kHz
V
NOISE
200
Vrms
Threshold voltage
V
TH
Version: AA, AG, AM
1.77
1.84
1.95
2.04
2.17
V
V
TH
Version: AB, AH, AN
2.09
2.18
2.32
2.41
2.55
V
V
TH
Version: AC, AI, AO
2.48
2.59
2.73
2.86
3.03
V
V
TH
Version: AD, AJ, AP
3.11
3.23
3.42
3.59
3.80
V
V
TH
Version: AE, AK, AQ
3.55
3.70
3.88
4.08
4.32
V
Threshold hysteresis
V
HYS
25
mV
RES Output Low Level
V
OL
V
OUTPUT
= 5 V, I
OL
= 8 mA
175
400
mV
V
OL
V
OUTPUT
= 3 V, I
OL
= 4 mA
140
300
mV
V
OL
V
OUTPUT
= 1 V, I
OL
= 50 A
20
90
mV
RES Output High Level
7)
V
OH
V
OUTPUT
= 5 V, I
OH
=- 8 mA
4.3
4.5
V
V
OH
V
OUTPUT
= 3 V, I
OH
= -4 mA
2.3
2.6
V
V
OH
V
OUTPUT
= 1 V, I
OH
= -100 A
850
950
mV
Leakage current
6)
I
LEAK
V
OUTPUT
= 5 V
0.05
1
A
Table 3
1
)
If INPUT is connected to V
SS
, no reverse current will flow from the OUTPUT to the INPUT, however the supply current specified
will be sank by the OUTPUT to supply the A6300.
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)
Only for open drain versions.
7)
For push-pull output only
8)
Reset output open
4
A6300
Timing Characteristics
V
OUTPUT
= 5.0 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.
Units
Power-on Reset time
t
POR
25
50
75
ms
Sensitivity
1)
t
SEN
V
OUTPUT
= 5 V to 3 V in 5
s
20
0.8*t
R
s
Propagation time
1)
t
R
V
OUTPUT
= 5 V to 3 V in 5
s
22
75
200
s
1)
Tested on version with V
TH
higher than 3 V
Table 4
Timing Waveforms
Voltage Monitoring
Block Diagram
V
OUTPUT
V
TH
1 V
Logic"1"
Logic"0"
Logic"1"
Logic"0"
t
POR
t
POR
t
R
t
SEN
t
RES
t
RES
t
Fig.3
Voltage
Regulator
Voltage
Reference
Voltage
Reference
INPUT
V
IN
OUTPUT
Reset
Logic
Timer
V
SS
Fig. 4
RES
or
RES
Oscillator
5
A6300
Pin Description
Pin Name
Function
1
RES or RES
Reset output
2
V
SS
Supply ground
3
N.C.
Not connected
4
N.C.
Not connected
5
N.C.
Not connected
6
INPUT
Unregulated positive supply
7
OUTPUT
Regulated output
8
N.C.
Not connected
Table 5
Functional Description
Voltage Regulator
The A6300 has a 5 V
2%, 100 mA, low dropout volt-
age regulator. The low supply current (typ.100
A) mak-
es the A6300 particularly suited to automotive systems
then remain energized 24 hours a day. The input voltage
range is 2.3 V to 26 V for operation and the input protec-
tion includes both reverse battery ( 20 V below ground)
and load dump (positive transients up to 60 V). There is
no reverse current flow from the OUTPUT to the INPUT
when the INPUT equals V
SS
.This feature is important for
systems which need to implement (with capacitance) a
minimum power supply hold-up time in the event of
power failure. To achieve good load regulation a 22
F
capacitor (or greater ) is needed on the INPUT (see
Fig. 5). Tantalum or aluminium electrolytics are adequate for
the 22
F capacitor; film types will work but are relatively
expensive. Many aluminium electrolytics have electroly-
tes that freeze at about 30
C, so tantalums are
recommended for operation below 25
C. The important
parameters of the 22
F capacitor are an effective series
resistance of
5
and a resonant frequency above
500 kHz.
A 10
F capacitor (or greater) and a 100 nF capacitor
are required on the OUTPUT to prevent oscillations due
to instability. The specification of the 10
F capacitor is
as per the 22
F capacitor on the INPUT (see previous
paragraph).
The A6300 will remain stable and in regulation with no
external load and the dropout voltage is typically con-
stant as the input voltage fall to below its minimum level
(see Table 2). These features are especially important in
CMOS RAM keep-alive applications.
Voltage Monitoring
The power-on reset and the power-down reset are gene-
rated internally with a voltage comparison of the voltage
reference and the resistor divider (see Fig.4).
At power-up the reset output (RES) is held low (see
Fig. 3). After OUTPUT reaches V
TH
, the RES output is
held low for an additional power-on-reset (POR) delay
t
POR
(typically 50 ms ).The power-on reset delay
prevents repeated toggling of RES even if V
OUTPUT
and
the INPUT voltage drops out and recovers. The POR
delay allows the microprocessor's crystal oscillator time
to stabilize and to ensure correct recognition of the reset
signal to the microprocessor.
The RES output goes active low generating the power-
down reset whenever V
OUTPUT
falls below V
TH
. The sensi-
tivity or reaction time of the internal comparator to the
voltage level on V
IN
is typically 70
s.
Temperature Consideration
Care must be taken not to exceed the maximum junction
temperature (+ 125
C). The power dissipation within
the A6300 is given by the formula:
T
TOTAL
= (V
INPUT
V
OUTPUT
) * I
OUTPUT
+ (V
INPUT
) * I
SS
The maximum continuous power dissipation at a given
temperature can be calculated using the formula:
P
max
= ( 125
C T
A
) / R
th(j-a)
where R
th(j-a)
is the termal resistance from the junction
to the ambient and is specified in Table 2. Note the R
th(j-a)
given in Table 2 assumes that the package is soldered
to a PCB. The above formula for maximum power dissi-
pation assumes a constant load(i.e.
100 s). The tran-
sient thermal resistance for a single pulse is much lower
than the continuous value. For example the A6300 in
DIP8 package will have an effective thermal resistance
from the junction to the ambient of about 10
C/W for
a single 100 ms pulse.
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