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AS13985F12-T

P1-P3P4-P6P7-P9P10-P12
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.
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.
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 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.
VREF
AS13985
Over-Current/
Over-Temperature
Protection
+
–
EN
VIN
VOUT
BYPASS
GND
www.austriamicrosystems.com Revision 1.13 2 - 12
AS13985
Datasheet - Pinout
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.
V
EN ≥ 1.2V: VOUT is enabled.
V
EN ≤ 0.4V: VOUT is disabled.
VOUT 3 5
Regulated Output Voltage
AS13985
(WLP; Top Through View)
1
54
3
2
AS13985
(SOT23)
2
GND
3
BYPASS
1
VIN
4
EN
5
VOUT
www.austriamicrosystems.com Revision 1.13 3 - 12
AS13985
Datasheet - Absolute Maximum Ratings
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.
P
(MAX) = (TJ(MAX) - (TAMB))/
Θ
JA (EQ 1)
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.
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
I
OUT (Survival) Short-circuit protected.
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 V
IN 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 temperature (TJ(MAX), the
junction-to-ambient thermal resistance (Θ
JA), 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).
P1-P3P4-P6P7-P9P10-P12

AS13985F12-T

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Buy AS13985F12-T
Manufacturer:
ams
Description:
LDO Voltage Controllers
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