DA9124.009
11 January 2005
MAS9124
150 mA LDO Voltage Regulator IC
•
Low Noise: 20 µVrms
•
Low Minimum Output Capacitance
Requirement: 0.23 µF
•
Excellent Ripple Rejection: 65 dB
•
Very Low Dropout: 70 mV
•
Regulator Enable/Disable Control
•
Stable with Low-ESR Output
Capacitors
DESCRIPTION
MAS9124 is a low dropout voltage regulator with
very low output noise, high PSRR and small output
capacitance requirement.
Due to the low noise level of only 20 µVrms,
MAS9124 is suitable for sensitive circuits, e.g., in
RF applications. In addition to the noise levels,
MAS9124 excels in dropout voltage (70 mV typical
at 50 mA) and rise time (16 µs typical without
bypass capacitor). Also its ripple rejection ability of
65 dB at 10 kHz exceeds that of competition.
The Equivalent Series Resistance (ESR) range of
output capacitors that can be used with MAS9124
is very wide. This ESR range from a few mΩ up to a
couple of Ohms combined with no minimum output
current requirement makes the usage of MAS9124
easier and low in cost.
MAS9124 features an enable/disable pin, which
allows device to be turned off or on by pulling
control to low or high. In order to save power the
device goes into sleep mode when the regulator is
disabled.
MAS9124 also includes an auto-discharge function,
wherein a shutdown transistor turns on and
discharges the output capacitor, when MAS9124 is
turned off.
An internal thermal protection circuit prevents the
device from overheating. Also the maximum output
current is internally limited.
FEATURES
•
Low Noise
•
Functionally and Pin Compatible with
LP2985/LP3985
•
Can be used w/o C
BYPASS
, see p. 6
•
Auto-discharge Function
•
Internal Thermal Shutdown
•
Short Circuit Protection
•
Small SOT23-5 or Thin TSOT-5 Package
•
Several Output Voltage Options Available, see
Ordering Information p. 12
APPLICATIONS
•
Mobile Phones
•
WLAN Chipsets
•
Cordless Phones
•
Accessories
•
Pagers
•
Battery Powered Systems
•
Portable Systems
•
Radio Control Systems
•
Low Voltage Systems
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DA9124.009
11 January 2005
PIN CONFIGURATION
SOT23-5/TSOT-5
Top View
VOUT
5
24AX
1
2
3
BYPASS
4
VIN GND CTRL
For top marking information see
ordering information p. 12
PIN DESCRIPTION
Pin Name
Pin Number in
SOT23-5 /
TSOT-5
1
2
3
4
5
Type
Function
VIN
GND
CTRL
BYPASS
VOUT
P
G
I
I
O
Power Supply Voltage
Ground
Enable/Disable Pin for Regulator
Pin for Bypass Capacitor
Output
BLOCK DIAGRAM
VIN
CTRL
OVER CURRENT /
OVER TEMPERATURE
PROTECTION
VOLTAGE
REFERENCE
160kΩ
+
SHUT-
DOWN
VOUT
BYPASS
GND
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DA9124.009
11 January 2005
ABSOLUTE MAXIMUM RATINGS
All voltages with respect to ground
Parameter
Supply Voltage
Voltage Range for All Pins
ESD Rating
Junction Temperature
Storage Temperature
Symbol
V
IN
Conditions
Min
-0.3
-0.3
Max
6
V
IN
+ 0.3
2
+175
(limited)
Unit
V
V
kV
°C
°C
HBM
T
Jmax
T
S
-55
+150
Stresses beyond those listed may cause permanent damage to the device. The device may not operate under these conditions, but it will
not be destroyed.
RECOMMENDED OPERATING CONDITIONS
All voltages with respect to ground
Parameter
Operating Junction
Temperature
Operating Ambient
Temperature
Operating Supply
Voltage
Symbol
Conditions
Min
-40
Max
+125
+85
5.3
5.8
Unit
°C
°C
V
T
A
V
IN
V
OUT(NOM)
< 2.2 V
V
OUT(NOM)
≥
2.2 V
V
OUT(NOM)
= 5 V
-40
2.5
V
OUT(NOM)
+ 0.3
V
OUT(NOM)
+ 0.3
ELECTRICAL CHARACTERISTICS
Thermal Protection
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Threshold High
Threshold Low
Symbol
T
H
T
L
Conditions
Min
145
135
Typ
160
150
Max
175
165
Unit
°C
°C
The hysteresis of 10°C prevents the device from turning on too soon after thermal shut-down.
Control Terminal Specifications
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Control Voltage
OFF State
(Note 1)
ON State
Control Current
Symbol
V
CTRL
I
CTRL
Conditions
Min
−0.3
1.6
Typ
Max
0.55
V
IN
+ 0.3
Unit
V
V
CTRL
= V
IN
V
CTRL
= 0 V
5
0
µA
0.9
If CTRL-pin is not connected, MAS9124 is in OFF state (900 kΩ pull-down resistor to ground).
Note 1:
If V
OUT(NOM)
= 5 V, the device should always be in the ON state.
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Voltage Parameters
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Output Voltage
Tolerance
Symbol
V
OUT
Conditions
V
OUT(NOM)
≤
3.3 V
I
OUT
= 0 mA
I
OUT
= 150 mA
V
OUT(NOM)
> 3.3 V
I
OUT
= 0 mA
I
OUT
= 150 mA
I
OUT
= 1 mA
I
OUT
= 50 mA
I
OUT
= 150 mA
MAS9124A4 (150 mA)
MAS9124A5 (150 mA)
Min
V
OUT(NOM)
−
0.05
V
OUT(NOM)
−
0.10
V
OUT(NOM)
−
0.10
V
OUT(NOM)
−
0.10
Typ
Max
V
OUT(NOM)
+ 0.05
V
OUT(NOM)
+ 0.05
V
OUT(NOM)
+ 0.10
V
OUT(NOM)
+ 0.10
Unit
V
Dropout Voltage
V
DROP
mV
1.7
70
200
320
800
1100
Current Parameters
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Continuous Output Current
Short Circuit Current
Peak Output Current
Ground Pin Current
Symbol
I
OUT
I
MAX
I
PK
I
GND
Conditions
Min
0
Typ
Max
150
Unit
mA
mA
mA
µA
R
L
= 0
Ω
V
OUT
> 95%* V
OUT(NOM)
I
OUT
= 0 mA
I
OUT
= 10 mA
I
OUT
= 50 mA
I
OUT
= 150 mA
V
CTRL
= 0 V
200
450
410
120
130
160
220
0.01
675
200
400
5
Ground Pin Current, Sleep
Mode
Power Dissipation
I
GND
µA
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Junction to Ambient Thermal
Resistance
Symbol
R
JA
Conditions
thermal test board according
to JESD51-7 (4 layers),
SOT23-5 package
TSOT-5 package
any ambient temperature
Min
Typ
Max
Unit
°C/W
191
207
P
dMAX
=
Note 1
Maximum Power Dissipation
P
d
T
J(MAX)
−
T
A
R
JA
W
Note 1:
T
J(MAX)
denotes maximum operating junction temperature (+125°C), T
A
ambient temperature, and R
JA
junction-to-air thermal
resistance specified above. See also application information p. 7.
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Line and Load Regulation
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Line Regulation
Load Regulation
Symbol
Conditions
V
OUT(NOM)
+ 1 V < V
IN
< 5.3 V,
I
OUT
= 60 mA
I
OUT
= 1 mA to 50 mA
I
OUT
= 1 mA to 150 mA
Min
Typ
0.7
5
10
Max
Unit
mV
mV
Noise and Ripple Rejection
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Output Noise Voltage
Noise Density
PSRR
Symbol
V
RMS
V
N
Conditions
300Hz < f < 50 kHz
C
BYPASS
= 10 nF
w/o C
BYPASS
I
OUT
= 50 mA,
f = 1 kHz
f = 1 kHz
f = 10 kHz
f = 100 kHz
Min
Typ
20
110
100
67
65
48
Max
Unit
µVrms
nV
Hz
dB
Dynamic Parameters
T
A
= -40°C to +85°C, typical values at T
A
= +27°C, V
IN
= V
OUT(NOM)
+ 1.0 V (or min 3.8 V), I
OUT
= 1.0 mA, C
IN
= 1.0 µF, C
L
= 1.0 µF,
C
BYPASS
= 10 nF, V
CTRL
= V
IN
, unless otherwise specified
Parameter
Rise Time (10%…90%)
Overshoot
Start-up Delay
Symbol
Conditions
V
CTRL
= 0 to 2.4 V, I
OUT
= 30mA
C
BYPASS
= 10 nF
w/o C
BYPASS
V
CTRL
= 0 to 2.4 V,
w/o C
BYPASS
V
CTRL
to V
OUT
, w/o C
BYPASS
(see figure 1 below)
Min
Typ
4
16
3
17
Max
Unit
ms
µs
%
µs
10
50%
CTRL
overshoot
90%
VOUT
10%
delay
rise time
Figure1.
Definitions of
rise time, overshoot and
start-up delay
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