Datasheet
AS1358/AS1359
150mA/300mA, Ultra-Low-Noise, High-PSRR
Low Dropout Regulators
1 General Description
The AS1358/AS1359 are ultra-low-noise, low-dropout
linear regulators specifically designed to deliver up to
150/300mA continuous output current, and can achieve
a low 140mV dropout for 300mA load current. The LDOs
are designed and optimized to work with low-cost, small-
capacitance ceramic capacitors.
The devices are available as the standard products
listed in
Table 1.
Table 1. Standard Products
Model
AS1358
AS1359
Load Current
150mA
300mA
Output Voltage
Preset – 1.5 to 4.5V
Preset – 1.5 to 4.5V
2 Key Features
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Preset Output Voltages: 1.5 to 4.5V (in 50mV steps)
Output Noise: 9µV
RMS
@ 100Hz to 100kHz
Power-Supply Rejection Ratio: 92dB @ 1kHz
Low Dropout: 140mV @ 300mA Load
Stable with 1µF Ceramic Capacitor for any Load
Guaranteed 150/300mA Output
1.25V Internal Reference
Extremely-Low Quiescent Current: 40µA
Excellent Load/Line Transient
Overcurrent and Thermal Protection
TSOT23 5-pin Package
An integrated P-channel MOSFET pass transistor allows
the devices to maintain extremely low quiescent current
(40µA).
The AS1358/AS1359 uses an advanced architecture to
achieve ultra-low output voltage noise of 9µV
RMS
and a
power-supply rejection-ratio of better than 80dB (up to
10kHz).
The AS1358/AS1359 requires only 1µF output capacitor
for stability at any load. When the LDO is disabled, cur-
rent consumption drops below 500nA.
The devices are available in a TSOT23 5-pin package.
3 Applications
The devices are ideal for mobile phones, wireless
phones, PDAs, handheld computers, mobile phone
base stations, Bluetooth portable radios and accesso-
ries, wireless LANs, digital cameras, personal audio
devices, and any other portable, battery-powered appli-
cation.
Figure 1. Typical Application Circuit
Input
2V to 5.5V
C
IN
1µF
1
IN
5
OUT
Output
1.5V to 4.5V
2
GND
AS1358/
AS1359
On
Off
3
SHDNN
4
C
BYPASS
10nF
C
OUT
1µF
BYPASS
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AS1358/AS1359
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
IN 1
5 OUT
GND 2
AS1358/
AS1359
SHDNN 3
4 BYPASS
TSOT23 5-pin
Pin Descriptions
Table 2. Pin Descriptions
Pin Number
1
2
3
4
Pin Name
IN
GND
SHDNN
BYPASS
Unregulated Input Supply.
Ground
Shutdown.
Pull this pin low to disable the LDO.
Noise Bypass for Low-Noise Operation.
Connect a 10nF capacitor from
this pin to
OUT.
Note:
This pin is shorted to GND in shutdown mode.
Regulated Output Voltage.
Bypass this pin with a capacitor to GND. See
Capacitor Selection and Regulator Stability on page 11
for more details.
Description
5
OUT
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AS1358/AS1359
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 3
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
Electrical Character-
istics on page 4
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Table 3. Absolute Maximum Ratings
Parameter
IN to GND
OUT, SHDNN to GND
BYPASS to GND
Output Short-Circuit Duration
Thermal Resistance
Θ
JA
Operating Temperature Range
Junction Temperature
Storage Temperature Range
-65
-40
Min
-0.3
-0.3
-0.3
Max
+7
IN +
0.3
OUT +
0.3
Infinite
201.7
+85
+150
+150
ºC/W
ºC
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).
on PCB
Units
V
V
V
Comments
Package Body Temperature
+260
ºC
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AS1358/AS1359
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
V
IN
= V
OUT
+0.5V, C
IN
= 1µF, C
OUT
= 1µF, C
BYPASS
= 10nF, T
AMB
= -40 to +85ºC (unless otherwise specified). Typ val-
ues are at T
AMB
= +25ºC.
Table 4. Electrical Characteristics
Symbol
V
IN
Parameter
Input Voltage Range
I
OUT
= 1mA, T
AMB
= +25ºC
I
OUT
= 100µA to 150mA, T
AMB
= +25ºC
(AS1358)
Output Voltage Accuracy
I
OUT
= 100µA to 300mA, T
AMB
= +25ºC
(AS1359)
I
OUT
= 100µA to 150mA, (AS1358)
I
OUT
= 100µA to 300mA, (AS1359)
I
OUT
I
LIMIT
Maximum Output Current
Current Limit
AS1358
AS1359
AS1358, OUT = 90% of nom., T
AMB
= +25ºC
AS1359, OUT = 90% of nom., T
AMB
= +25ºC
V
OUT
≥
3V, I
OUT
= 150mA
V
OUT
≥
3V, I
OUT
= 300mA, (AS1359 only)
2.5V
≤
V
OUT
<
3V, I
OUT
= 150mA
Dropout Voltage
1
Condition
Min
2
-0.5
-0.75
-1.0
-1.5
-2.0
150
300
Typ
Max
5.5
+0.5
+0.75
+1.0
+1.5
+2.0
Unit
V
%
mA
270
510
70
140
90
170
140
270
40
150
0.02
0.0005
9
92
80
62
9
µV
dB
500
95
200
120
230
190
350
90
250
µA
%/V
%/mA
nA
mV
mA
2.5V
≤
V
OUT
<
3V, I
OUT
= 300mA,
(AS1359 only)
2.0V
≤
V
OUT
<
2.5V, I
OUT
= 150mA
2.0V
≤
V
OUT
<
2.5V, I
OUT
= 300mA,
(AS1359 only)
I
Q
V
LNR
V
LDR
I
SHDNN
PSRR
Quiescent Current
Line Regulation
Load Regulation
Shutdown Supply Current
Ripple Rejection
I
OUT
= 0.05mA
V
IN
= V
OUTNOM
- 0.1V, I
OUT
= 0mA
V
IN
= (V
OUT
+0.5V) to 5.5V, I
OUT
= 0.1mA
I
OUT
= 1 to 150/300mA
SHDNN = 0V
f = 1kHz, I
OUT
= 10mA
f = 10kHz, I
OUT
= 10mA
f = 100kHz, I
OUT
= 10mA
f = 100Hz to 100kHz,
I
LOAD
= 0 to 150/300mA
Output Noise Voltage (RMS)
Shutdown
Shutdown Exit Delay
2
R
LOAD
= 50Ω
V
IN
= 2 to 5.5V
V
IN
= 2 to 5.5V
1.5
300
0.4
µs
V
V
SHDNN Logic Low Level
SHDNN Logic High Level
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AS1358/AS1359
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 4. Electrical Characteristics (Continued)
Symbol
Parameter
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Condition
Min
Typ
Max
Unit
Thermal Protection
T
SHDNM
ΔT
SHDN
M
160
15
ºC
ºC
1. Dropout is defined as V
IN
- V
OUT
when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+ 0.5V
2. Time needed for V
OUT
to reach 90% of final value.
Note:
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
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