DA9128A.002
July 12, 1998
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The MAS9128A is voltage regulator IC with three
2.85V LDO regulators providing voltage regulation
for the handset terminal. The output voltages of the
three regulators can be modified through a mask
option. Two enable/disable pins control the state of
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the regulators. In order to save power the device
goes into sleep mode when all regulators are
disabled. An internal thermal protection circuit
prevents the device from overheating. The
maximum output current is limited internally.
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2.85V regulators at 100mA, 70mA and 50mA
•
Output accuracy <±3%
•
Fast dynamic response
•
Low output noise
•
Low supply current: 150µA per regulator
•
SO8 package
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Mobile phones
•
Cordless phones
•
Battery powered systems
ENA
&
LDO_A
(100mA)
OUTA
&
ENBC
LDO_B
(70mA)
OUTB
&
Temperature
Protection
LDO_C
(50mA)
OUTC
&
Bandgap
Reference
VREF
VCC
GND
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DA9128A.002
July 12, 1998
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1
8
OUTB
OUTA
OUTC
2
7
VCC
ENBC
3
6
GND
ENA
4
5
VREF
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OUTA
OUTC
ENBC
ENA
VREF
GND
VCC
OUTA
1
2
3
4
5
6
7
8
O
O
I
I
O
P
P
O
2.85V/100mA regulator output
2.85V/50mA regulator output
Enable for regulators B and C
Enable for regulator A
Reference voltage
Ground
Positive supply voltage
2.85V/70mA regulator output
2
DA9128A.002
July 12, 1998
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(All voltages with respect to ground.)
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Supply Voltage
V
CC
-0.3
13.0
V
Logic input voltage
V
EN
-0.3
V
CC
+0.3
0
Max. Junction Temperature
T
J
150
C
0
Thermal resistance
R
JA
163
C/W
0
Lead temperature
for 10 seconds
230
C
0
Storage Temperature
T
S
-55
+150
C
ESD Rating
Note 1: Stresses beyond those listed may cause permanent damage to the device. The device may not operate
under these conditions, but will not be destroyed.
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Supply Voltage
Operating Temperature
V
CC
T
AMB
3.1
-20
6.5
+70
0
V
C
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Threshold high
Threshold low
Continuos power dissipation
in operation
T
H
T
L
130
120
150
140
170
160
0
0
C
C
T
AMB
= 25
0
C
T
AMB
= 70 C
0
644
368
mW
mW
0
NOTE 2:A hysteresis of 10 C avoids oscillation in case of thermal shutdown. After the regulator temperature
has dropped by this value, it will turn on again automatically.
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(T
AMB
= -20 C to +70 C, unless otherwise noted. Typical value for T is 27 C.)
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0
0
0
Input high voltage
Input low voltage
V
IH
V
IL
2.2
0.40
V
V
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DA9128A.002
July 12, 1998
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(T
AMB
= -20 C to +70 C, unless otherwise noted. Typical value for T is 27 C Cin=1µF Cout= 1µF,ceramic)
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0
0
0
Output voltage
Short circuit current
LDO_A
LDO_B
LDO_C
Load Current
LDO_A
LDO_B
LDO_C
Line regulation
Load regulation
LDO_A
LDO_B
LDO_C
Load transient
V
OUT
3.1V < V
CC
< 6.5V,
0mA < I
OUT
< I
MAX
2.7
2.85
3.0
V
I
MAXA
I
MAXB
I
MAXC
I
OUTA
I
OUTB
I
OUTC
1Vpp at V
CC
, max. load
0mA < I
OUT
< I
MAX
0
0
0
310
220
170
100
70
50
1.1
9
6
5
T
AMB
= 25
o
C
10uA to ½ load in 1us
(
4)
mA
mA
mA
mA
mA
mA
mV
mV
mV
mV
mV
mV
mV
dB
10
45
31
22
-60
-70
-85
50
60
100uA to max. Load in 1us (4)
10uA to max. Load in 1us (5)
PSRR
Quiescent current
per regulator
I
QR
I
QR
I
QR
Total quiescent
current
Noise
I
Q
f
≤
10kHz, 1Vpp at V
CC
= 4.5V
CREF = 10nF
(3)
ON, max. load
ON, I
OUT
= 100uA
OFF
ENA = ENBC = 0V
I
OUT
= 0 V
CC
= 6.5V
10Hz < f < 100kHz
typical load, no capacitor at VREF
10Hz < f < 100kHz
typical load, 10nF cap. at VREF
Enables OFF to ON
2.7V < V
OUT
< 3.0V
10nF cap. at VREF
C
OUT
ESR
0.8
0.01
170
150
<1
<1
30
uA
uA
uA
µA
190
50
0.5
1.0
uVrms
uVrms
ms
Settling time
Output capacitor
1.0
0.1
2.6
1
uF
Ohm
NOTE 3:To get the real quiescent current of the device, the quiescent current of the reference voltage
generator (140uA typ.) has to be added together once for all regulators.
NOTE 4:V
OUT
does not drop below 2.7V for more than 1us.
NOTE 5:V
OUT
does not drop below 2.5V for more than 1us or below 2.7V for more than 50us.
4
DA9128A.002
July 12, 1998
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The device is supplied with 3.1V to 6.5V battery
voltage under normal conditions. An internal band
gap voltage reference is used to generate the
reference voltage for all three voltage regulators.
The reference voltage is routed via an internal
20kOhm Resistor to an external pin where a filter
capacitor can be connected in order to reduce the
noise level of all three regulators. The startup time
of the reference voltage is then determined by the
value of the bypass capacitor at pin VREF.
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Each regulator can be enabled/disabled by the two
enable pins ENA and ENBC. Pin ENA controls
regulator LDO_A and pin ENBC controls both
regulators LDO_B and LDO_C. If both enable pins
are forced low, the internal voltage reference and
internal bias source are turned off in order to save
power. A common enable for all three regulator
outputs is designed, but connected to VDD
internally for the SOIC8 version of MAS9128A.
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The device contains three 2.85V low dropout
CMOS regulators with maximum output currents of
100mA, 70mA and 50mA. There is a mask option
to modify the output voltage to 2.55V, 2.70V,
2.85V, 3.00V or 3.15V. The IC has thermal
protection in order to prevent thermal destruction
especially at high ambient temperatures. Maximum
output current of each regulator is limited by an
internal circuitry. The regulation loop of the
regulators is optimized to work with low ESR
ceramic buffer capacitors at the output.
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ON
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
ON
OFF
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