AS13985
Micropower 150mA Low-Noise LDO
www.austriamicrosystems.com Revision 1.13 1 - 12
Datasheet
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.
S t ability 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 ha s to operate in
linear mode.
A 10nF bypass capacitor can be added to reduce output
noise to 30µV. The low-noise perfo r mance allows direct
connection of noise sensitive circuits without additional fil-
tering networks.
Multiple output voltage options are available as standard
products. Cont act austriam icrosystems AG for details.
The AS13985 is available in a 5-bump WLP package and a
5-pin SOT23 package.
Figure 1. AS13985 - Block Diagram
2 Key Features
! 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
3 Applications
The AS13985 is ideal for po wering cordless and mobile
phones, MP3 players, CD and DVD players, PDAs, ha nd-
held computers, digital cameras, and any other hand-held
battery-powered device.
VREF
AS13985
Over-Current/
Over-Temperature
Protection
+
–
EN
VIN
VOUT
BYPASS
GND
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AS13985
Datasheet - Pin o u t
4 Pinout
4.1 Pin Assignments
Figure 2. Pin Assignments (Top View)
4.2 Pin Descriptions
Table 1. Pin Descriptions
Name WLP SOT23 Description
VIN 4 1 Input Voltage
GND 2 2 Ground
BYPASS 5 3 Low-Noise Operation Bypass Capacitor
EN 1 4 Logic-High Enable Input.
VEN ≥ 1.2V: VOUT is enabled.
VEN ≤ 0.4V: VOUT is disabled.
VOUT 3 5 Regulated Output Voltage
AS13985
(WLP; Top Through View)
1
54
3
2AS13985
(SOT23)
2
GND
3
BYPASS
1
VIN
4EN
5VOUT
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AS13985
Datasheet - Abs ol ut e M ax im um Ra ting s
5 Absolute Maximum Ratings
Stresses beyond those list ed 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.
P(MAX) = (TJ(MAX) - (TAMB))/
Θ
JA (EQ 1)
Where:
The value of ΘJA for the SOT23 package is 220ºC/W in a typical PC-board mounting.
The value of ΘJA 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.
Table 2. Absolute Maximum Ratings
Parameter Min Max Units Comments
Input Supply Voltage (Survival) -0.3 +7 V
Input Supply Voltage (Operating) +2.5 +5.5 V
Shutdown Input Voltage (Survival) -0.3 +7 V
Output Voltage (Survival) -0.3 +7 V
IOUT (Survival) Short-circui t p r ot ected.
Input/Output Voltage (Survival) 1
1. The output PNP structure contains a diode between pins VIN and VOUT that is normally reverse-biased. revers-
ing the polarity of pins VIN and VOUT will activate this diode.
-0.3 +7 V
Power Dissipation 2
2. The maximum allowable power dissipation is a function of the maximum junction te mperature (TJ(MAX), the
junction-to-ambient thermal resistance (ΘJA), and the ambient temperature (TAMB). The maximum allowable
power dissipation at any ambient temperature is calculated as:
Internally limited.
Operating Junction Temperature -40 +125 ºC
Storage Temperature Range -65 +150 ºC
Package Body Temperature +260 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).
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AS13985
Datasheet - Ele 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 othe rwis e spec -
ified)
Caution: Exposing the WLP package to direct light could cause device malfunction.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Unit
VIN Operating Input Voltage 2.5 5.5 V
VOUT(NOM)
- VOUT
Output Voltage Accuracy
< 2.5V VOUT IOUT = 1mA -50 50 mV
TAMB = -40 to 125ºC -75 75
Output Voltage Accuracy
≥ 2.5V VOUT IOUT = 1mA -1 1 % of
VOUT(NOM)
TAMB= -40 to 125ºC -2 2
ΔVOUT
Line Regulation1
VIN = (VOUT(NOM) + 0.5V) to 4.5V,
VOUT < 3V -0.15 0.15 %/V
VIN = (VOUT(NOM) + 0.5V) to 5.5V,
VOUT < 3V -0.3 0.3
Load Regulation
IOUT = 1 to 150mA, VOUT < 2.5V,
TAMB = -40 to 125ºC 0.002 0.008
%/mA
IOUT = 1 to 150mA, VOUT ≥ 2.5V,
TAMB = -40 to 125ºC (for WLP) 0.0004 0.002
IOUT = 1 to 150mA, TAMB = -40 to 125ºC
(for SOT23-5), VOUT ≥ 2.5V 0.0025 0.005
Output AC Line
Regulation VIN = VOUT(NOM) + 1V,
IOUT = 150mA, tR = tF = 30µs 1 mVPP
IQ Quiescent Current
On Mode: VEN = 1.2V, IOUT = 0mA 95
µA
On Mode: VEN = 1.2V, IOUT = 0mA,
TAMB = -40 to 125ºC 130
On Mode: VEN = 1.2V, IOUT = 0 to 150mA 160
On Mode: VEN = 1.2V,
IOUT = 0 to 150mA, TAMB = -40 to 125ºC 250 2
Off Mode: V EN = 0.4V, IOUT = 0mA 0.003 2
Off Mode: V EN = 0.4V,
TAMB= -40 to 125ºC, IOUT = 0mA 1
VDROP Dropout Voltage 3
IOUT = 1mA 0.3
mV
IOUT = 1mA, TAMB = -40 to 125ºC 2 2
IOUT = 50mA 15
IOUT = 50mA, TAMB = -40 to 125ºC 35
IOUT = 100mA 30
IOUT = 100mA, TAMB = -40 to 125ºC 70
IOUT = 150mA 45
IOUT = 150mA, TAMB = -40 to 125ºC 100
ISC Short Circuit Current RLOAD = 0Ω500 mA
SVR Supply Voltage
Rejection
VIN = VOUT(NOM) + 1V,
VRIPPLE = 50mV, IOUT = 50mA,
f = 1kHz 60
dB
VIN = VOUT(NOM) + 1V,
VRIPPLE = 50mV, IOUT = 50mA,
f= 10kHz 55
IOUT(PK) Peak Output Current VOUT ≥ VOUT(NOM) - 5% 300 500 mA
VEN Enable Input Logic Low VIN = 2.5 to 5.5V, TAMB = -40 to 125ºC 40.4 V
Enable Input Logic High 1.2
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AS13985
Datasheet - Ele c t r i c a l C h a r a c t e r i s t i c s
Figure 3. AC Line Regulation Input V oltage Test Signal
Figure 4. SVR Input Voltage Test Signal
IEN Enable Input Current VEN = 0.4V, VIN = 5.5V ±1 2nA
eN Output Noise Voltage
BW = 10Hz to 100kHz, COUT = 1µF,
IOUT = 0mA 30 µVRMS
tON Turn On Time 5CBYPASS = 10nF 150 250 µs
TSHDN Thermal Shutdown
Threshold 4, 6 160 ºC
Recommended Output Capacitor
COUT Output Capacitor Capacitance 1
22 2µF
ESR 5 5000 mΩ
1. Temperature variations are included within the output voltage accura cy.
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 tR = tF < 10ms.
5. Turn on time is time measured between the enable input just exceeding the VEN 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.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Unit
600mV
600µs 4.6ms
30µs
VIN =
VOUT(NOM) + 1V
30µs
VIN 50mV
VOUT(NOM) + 1V
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AS13985
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
TAMB = +25ºC (unless otherwise specified)
Figure 5. Output Voltage vs. Temperature; Figure 6. Shutdown Voltage vs. Temperature;
VIN = 3.4V, VSHDN = 1.4V, IOUT = 1mA VOUT = 2.9V, IOUT = 10mA
Figure 7. Load Regulation vs. Temperature; Figure 8. Line Regulation vs. Temperature;
VIN = 3.4V, VSHDN = 1.4V, IOUT = 1 to 150mA VIN = 3.4 to 5.0V, VSHDN =1.4V, IOUT =1mA
Figure 9. SVR vs. Frequency; VIN = 3.9 to 3.95V, Figure 10. Quiescent Current vs. Temperature;
VOUT = 2.9V, IOUT = 50mA, VSHDN = 1.4V VOUT = 2.9V, VSHDN = 1.4V
2.8
2.825
2.85
2.875
2.9
2.925
2.95
2.975
3
-45 -20 5 30 55 80 105 130
T emperat ur e ( °C)
Output Voltage (V) .
0.6
0.7
0.8
0.9
1
-45 -20 5 30 55 80 105 130
T emperat ur e ( °C)
Shutdown Voltage (V) .
VIN = 5.5V
VIN = 3.8V
-0.0075
-0.005
-0.0025
0
0.0025
0.005
0.0075
-45 -20 5 30 55 80 105 130
Temper ature ( ° C)
Load (%/mA) .
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-45 -20 5 30 55 80 105 130
T emperat ur e ( °C)
Line (%/V) .
0
10
20
30
40
50
60
70
80
90
100
0.1 2.1 4.1 6.1 8.1 10.1
Freque nc y (kHz)
SVR (dB) .
0
50
100
150
200
250
300
-45 -20 5 30 55 80 105 130
T emperat ur e ( °C)
IQ (µA) .
VIN = 5.5V
VIN = 3.4V
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AS13985
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 11. Line Transient Response; VIN = 3.8 to 4.4V,
Figure 12. Turn On Time; V
IN
= 3.3V, C
BYPASS
= 10nF,
T
J
= 25ºC, I
OUT
= 150mA, C
IN
= C
OUT
= 1µF, V
OUT
= 2.7V C
IN
= C
OUT
= 1µF (Ceramic), t
R
= 20ns,
C
BYPASS
= 10nF, Rise Time/Fall Time = 1µs I
OUT
= 1mA, V
OUT
= 2.8V
VOUT
1ms/Div
1V/Div 2mV/Div
VIN
EN
50µs/Div
500mV/Div 500mV/Div
VOUT
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AS13985
Datasheet - Ty p i c a l A p p l i c a t i o n
8 Typical Application
Figure 13. Typical Application Dia gram
VREF
AS13985
VIN
VOUT
Over-Current/
Over-Temperature
Protection
+
–
GND
1.23V
CBYPASS
0.01µF
CIN
1µF
COUT
1µF
EN
VIN
VOUT
BYPASS
GND
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AS13985
Datasheet - Pac kage Dr aw in gs an d M ar ki ng s
9 Package Drawings and Markings
The AS13985 is available in a 5- bump WLP package and a 5-pin SOT23 package.
Figure 14. 5-bump WLP Package
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AS13985
Datasheet - Pac kage Dr aw in gs an d M ar ki ng s
Figure 15. 5-pin SOT23 Package
Notes:
1. All dimensions are in millimeters.
2. Foot length is measured at the intercept point between datum
A and lead surface.
3. Package outline exclusive of mold flash and metal burr.
4. Package outli n e in cl u s i ve of solder plating.
5. Complies with EIAJ SC74.
Symbol Min Max
A 0.90 1.45
A1 0.00 0.15
A2 0.90 1.30
b 0.30 0.50
C 0.09 0.20
D 2.80 3.05
E 2.60 3.00
E1 1.50 1.75
L 0.30 0.55
e 0.95 Ref
e1 1.90 Ref
α0º 8º
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AS13985
Datasheet - O r d e r i n g I n f o r m a t i o n
10 Ordering Information
The AS13985 is available as the standard versions listed in Table 4. Other versions are available upon request. For
more information and inquiries contact http://www.austriamicrosystems.com/contact
Note: All products are RoHS compliant and Pb-free.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:sales@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
Table 4. Ordering Information
Ordering Code Marking Description Delivery Form Package
AS13985F33-T ASKK 3.3V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F30-T ASKJ 3.0V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F29-T ASKI 2.9V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F28-T ASLE 2.8V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F27-T ASKL 2.7V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F18-T ASKM 1.8V LDO, 150mA Tape and Reel 5-bump WLP
AS13985F12-T ASKN 1.2V LDO, 150mA Tape and Reel 5-bump WLP
AS13985H33-T ASK0 3.3V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H30-T ASK1 3.0V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H29-T ASK2 2.9V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H28-T ASLF 2.8V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H27-T ASK3 2.7V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H18-T ASK4 1.8V LDO, 150mA Tape and Reel 5-pin SOT23
AS13985H12-T ASK5 1.2V LDO, 150mA Tape and Reel 5-pin SOT23
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AS13985
Datasheet
Copyrights
Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement.
austriamicrosystems AG reserves th e right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring
extended temperature range, unusual environmental requirements, or high reliability applicatio ns, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional processing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show
deviations from the standard production flow, such as test flow or test location.
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austriamicrosystems AG rendering of technical or other services.
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austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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AS13985H-33-T AS13985H27-T AS13985H33-T