Datasheet
AS13985
Micropower 150mA Low-Noise LDO
1 General Description
The AS13985 is a high-performance low-dropout 150mA
voltage regulator designed for use with very-low ESR out-
put capacitors. The device can deliver superior perfor-
mance in all specifications critical to battery-powered
designs, and is perfectly suited for mobile phones, PDAs,
MP3 players, and other battery powered devices.
Stability is guaranteed with a ceramic output capacitor from
1 to 22µF. The low equivalent series resistance of these
capacitors ensures low output impedance at high frequen-
cies.
Automatic sleep mode requires less than 1µA quiescent
current when pin EN is pulled low.
Regulation performance is excellent even under low drop-
out conditions, when the power transistor has to operate in
linear mode.
A 10nF bypass capacitor can be added to reduce output
noise to 30µV. The low-noise performance allows direct
connection of noise sensitive circuits without additional fil-
tering networks.
Multiple output voltage options are available as standard
products. Contact austriamicrosystems AG for details.
The AS13985 is available in a 5-bump WLP package and a
5-pin SOT23 package.
2 Key Features
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Ultra-Low Dropout Voltage (typically
45mV @ 150mA, 0.3mV @ 1mA)
Supply Range: 2.5V to 5.5V
Output Voltage Range: 1.2V to 5.0V (in 25mV Steps)
Output Current: 150mA (Guaranteed)
Stable with Low-ESR Output Capacitor
Integrated Over-Temperature/Over-Current Protection
Low GND Pin Current (only 95µA)
Output Voltage Accuracy: 1%
Minimal External Components Required
High Peak-Current Capability
Low Shutdown Current:
≤1µA
Operating Temperature Junction Range: -40 to +125°C
Smallest Available Packages:
- 5-bump WLP
- 5-pin SOT23
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3 Applications
The AS13985 is ideal for powering cordless and mobile
phones, MP3 players, CD and DVD players, PDAs, hand-
held computers, digital cameras, and any other hand-held
battery-powered device.
Figure 1. AS13985 - Block Diagram
VIN
EN
V
REF
–
+
VOUT
BYPASS
Over-Current/
Over-Temperature
Protection
GND
AS13985
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AS13985
Datasheet - P i n o u t
4 Pinout
4.1 Pin Assignments
Figure 2. Pin Assignments (Top View)
VIN 1
5
4
5 VOUT
2
GND 2
1
3
AS13985
(SOT23)
AS13985
(WLP; Top Through View)
BYPASS 3
4 EN
4.2 Pin Descriptions
Table 1. Pin Descriptions
Name
VIN
GND
BYPASS
EN
VOUT
WLP
4
2
5
1
3
SOT23
1
2
3
4
5
Input Voltage
Ground
Low-Noise Operation Bypass Capacitor
Logic-High Enable Input.
V
EN
≥
1.2V: V
OUT
is enabled.
V
EN
≤
0.4V: V
OUT
is disabled.
Regulated Output Voltage
Description
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AS13985
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical
Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
Shutdown Input Voltage (Survival)
Output Voltage (Survival)
I
OUT
(Survival)
Input/Output Voltage (Survival)
Power Dissipation
2
1
Min
-0.3
+2.5
-0.3
-0.3
Max
+7
+5.5
+7
+7
Units
V
V
V
V
Comments
Short-circuit protected.
-0.3
+7
V
Internally limited.
-40
-65
+125
+150
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/
JEDEC J-STD-020D “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
Operating Junction Temperature
Storage Temperature Range
Package Body Temperature
+260
ºC
1. The output PNP structure contains a diode between pins V
IN
and V
OUT
that is normally reverse-biased. revers-
ing the polarity of pins V
IN
and V
OUT
will activate this diode.
2. The maximum allowable power dissipation is a function of the maximum junction temperature (T
J(MAX
), the
junction-to-ambient thermal resistance (Θ
JA
), and the ambient temperature (T
AMB
). The maximum allowable
power dissipation at any ambient temperature is calculated as:
P
(MAX)
= (T
J(MAX)
- (T
AMB
))/
Θ
JA
Where:
The value of
Θ
JA
for the SOT23 package is 220ºC/W in a typical PC-board mounting.
The value of
Θ
JA
for the WLP package is 225ºC/W.
Note:
Exceeding the maximum allowable dissipation will cause excessive device temperature and the regula-
tor will go into thermal shutdown.
(EQ 1)
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AS13985
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
T
AMB
= 25ºC, V
IN
= V
OUT(NOM)
+0.5V, C
OUT
= C
IN
= 1µF, C
BYPASS
= 10nF, I
OUT
= 1mA, V
EN
= 1.4V (unless otherwise spec-
ified)
Caution:
Exposing the WLP package to direct light could cause device malfunction.
Table 3. Electrical Characteristics
Symbol
V
IN
V
OUT(NOM)
- V
OUT
Parameter
Operating Input Voltage
Output Voltage Accuracy
< 2.5V V
OUT
Output Voltage Accuracy
≥
2.5V V
OUT
I
OUT
= 1mA
T
AMB
= -40 to 125ºC
I
OUT
= 1mA
T
AMB
= -40 to 125ºC
V
IN
= (V
OUT(NOM)
+ 0.5V) to 4.5V,
V
OUT
<
3V
V
IN
= (V
OUT(NOM)
+ 0.5V) to 5.5V,
V
OUT
<
3V
I
OUT
= 1 to 150mA, V
OUT
< 2.5V,
T
AMB
= -40 to 125ºC
Load Regulation
I
OUT
= 1 to 150mA, V
OUT
≥
2.5V,
T
AMB
= -40 to 125ºC (for WLP)
I
OUT
= 1 to 150mA, T
AMB
= -40 to 125ºC
(for SOT23-5), V
OUT
≥
2.5V
Output AC Line
Regulation
V
IN
= V
OUT(NOM)
+ 1V,
I
OUT
= 150mA, t
R
= t
F
= 30µs
On Mode: V
EN
= 1.2V, I
OUT
= 0mA
On Mode: V
EN
= 1.2V, I
OUT
= 0mA,
T
AMB
= -40 to 125ºC
On Mode: V
EN
= 1.2V, I
OUT
= 0 to 150mA
I
Q
Quiescent Current
On Mode: V
EN
= 1.2V,
I
OUT
= 0 to 150mA, T
AMB
= -40 to 125ºC
Off Mode: V
EN
= 0.4V, I
OUT
= 0mA
Off Mode: V
EN
= 0.4V,
T
AMB
= -40 to 125ºC, I
OUT
= 0mA
I
OUT
= 1mA
I
OUT
= 1mA, T
AMB
= -40 to 125ºC
I
OUT
= 50mA
V
DROP
Dropout Voltage
3
Conditions
Min
2.5
-50
-75
-1
-2
-0.15
-0.3
Typ
Max
5.5
50
75
1
2
0.15
Unit
V
mV
% of
V
OUT(NOM)
Line Regulation
1
%/V
0.3
0.002
0.008
%/mA
ΔV
OUT
0.0004 0.002
0.0025 0.005
1
95
130
160
250
0.003
2
2
mV
PP
µA
1
0.3
2
15
35
30
70
45
100
500
60
dB
55
300
4
2
I
OUT
= 50mA, T
AMB
= -40 to 125ºC
I
OUT
= 100mA
I
OUT
= 100mA, T
AMB
= -40 to 125ºC
I
OUT
= 150mA
I
OUT
= 150mA, T
AMB
= -40 to 125ºC
mV
I
SC
Short Circuit Current
R
LOAD
= 0Ω
V
IN
= V
OUT(NOM)
+ 1V,
V
RIPPLE
= 50mV, I
OUT
= 50mA,
f = 1kHz
V
IN
= V
OUT(NOM)
+ 1V,
V
RIPPLE
= 50mV, I
OUT
= 50mA,
f= 10kHz
V
OUT
≥
V
OUT(NOM)
- 5%
V
IN
= 2.5 to 5.5V, T
AMB
= -40 to 125ºC
mA
SVR
Supply Voltage
Rejection
I
OUT(PK)
V
EN
Peak Output Current
Enable Input Logic Low
Enable Input Logic High
500
0.4
mA
V
1.2
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AS13985
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics
Symbol
I
EN
eN
t
ON
T
SHDN
Parameter
Enable Input Current
Output Noise Voltage
Turn On Time
5
Conditions
V
EN
= 0.4V, V
IN
= 5.5V
BW = 10Hz to 100kHz, C
OUT
= 1µF,
I
OUT
= 0mA
C
BYPASS
= 10nF
Min
Typ
±1
2
Max
Unit
nA
µV
RMS
30
150
160
250
µs
ºC
Thermal Shutdown
4, 6
Threshold
Recommended Output Capacitor
C
OUT
Output Capacitor
Capacitance
ESR
1
5
22
2
µF
mΩ
5000
1. Temperature variations are included within the output voltage accuracy.
2. Guaranteed by design.
3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal
value (does not apply to input voltages below 2.5V).
4. EN must be driven with a t
R
= t
F
< 10ms.
5. Turn on time is time measured between the enable input just exceeding the V
EN
high value and the output volt-
age just reaching 95% of its nominal value.
6. Typical thermal protection hysteresis is 20ºC.
Note:
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
Figure 3. AC Line Regulation Input Voltage Test Signal
30µs
30µs
600mV
V
IN
=
V
OUT(NOM)
+ 1V
600µs
4.6ms
Figure 4. SVR Input Voltage Test Signal
V
IN
50mV
V
OUT(NOM)
+ 1V
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