Datasheet

AS1355
3 0 0 m A , Tri p l e L D O
1 General Description
Accuracy: ±1.0%
The AS1355 is a high-performance triple CMOS low-dropout voltage
regulator in a single QFN package. The efficient set of
programmable power supplies is optimized to deliver the best
compromise between quiescent current and regulator performance
for mobile phones, PDAs, MP3 players, and other battery powered
devices.
PSRR: 70dB at 1kHz, 60dB at 100kHz
Load Regulation: 3mV (0 to 300mA)
Supply Range: 2.3V to 5.5V
0.1V Dropout Voltage @ Iload = 200mA
Stability is guaranteed with ceramic output capacitors of only 1µF
(±20% – X5R) up to 4.7µF (±20% – X5R). The low equivalent series
resistance (ESR) of these capacitors ensures low output impedance
at high frequencies.
Shutdown Current: 1µA
Regulation performance is excellent even under low dropout
conditions, when the power transistor has to operate in linear mode.
Stable with low ESR Ceramic Capacitors from 1µF to 4.7µF
The low-noise performance allows direct connection of noise
sensitive circuits without additional filtering networks.
Thermal Protection
Supply Current Without Load: 160µA
Softstart for Low Inrush Current
Low Noise: 40µV rms @10Hz to 100kHz Bandwidth
Over-Current Protection
The AS1355 is available in a 16-pin QFN 3x3 package.
Temperature Range: -40°C to +85°C
Packages:
2 Key Features
- 16-pin QFN 3x3
- 16-pin TQFN 3x3
3 Independent Voltage Regulators with Shutdown
3 Applications
Output Current: 300mA each LDO
Programmable Output Voltage Range: 1.25V to 3.6V in 50mV
Steps
The AS1355 is ideal for 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. AS1355 - Typical Application Diagram
+5V
VDD1
3.3V
VOUT1
1µF
VDD2
1µF
1µF
VDD3
AS1355
1.5V
VOUT3
1µF
REF
VDDA
CREF = 100nF
(Improved Noise Performance)
EN1
µP
1.8V
VOUT2
EN2
GND
EN3
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Revision 1.3
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AS1355
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
EN1
1
VDDA
2
VDD1
3
VDD2
4
EN2
EN3
NC
REF
16
15
14
13
12 GND
11 GND
AS1355
10 NC
17
5
6
7
VOUT1 VOUT2 VOUT3
9
VDD3
8
NC
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
1
EN1
Description
2
VDDA
Analog Power Supply Voltage
3
VDD1
Unregulated Input Voltage 1
4
VDD2
Unregulated Input Voltage 2
5
VOUT1
Regulated Output Voltage 1
6
VOUT2
Regulated Output Voltage 2
7
VOUT3
Regulated Output Voltage 3
Active-High Enable Input 1. Pull this pin to GND to disable the regulated output voltage VOUT1.
Not Connected
8
NC
9
VDD3
10
NC
11, 12
GND
Ground.
Note: All GND pins must be connected together externally.
13
REF
Reference Voltage.
Note: Connect to a 100nF capacitor during normal operation.
14
NC
Not Connected
15
EN3
Active-High Enable Input 3. Pull this pin to GND to disable the regulated output voltage VOUT3.
16
EN2
Active-High Enable Input 2. Pull this pin to GND to disable the regulated output voltage VOUT2.
17
NC
Exposed Pad. This pad is not connected internally, it can be connected to GND.
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Unregulated Input Voltage 3
Not Connected
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AS1355
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 the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min
Max
Units
Comments
Electrical Parameters
VDDx, ENx to GND
-0.3
7
V
VOUTx to GND
-0.3
5
V
All other pins to GND
-0.3
VDD + 0.3
V
Electrostatic Discharge
Electrostatic Discharge HBM
2
kV
Norm: MIL 883 E method 3015
on PCB
Temperature Ranges and Storage Conditions
Thermal Resistance ΘJA
33
ºC/W
Junction Temperature
+125
ºC
+125
ºC
Storage Temperature Range
-55
Package Body Temperature
Humidity non-condensing
Moisture Sensitive Level
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5
+260
ºC
85
%
3
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020“Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
Represents a max. floor life time of 168h
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AS1355
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
VDD = 4V, COUT = 1µF, typical values are for TAMB = 25°C (unless otherwise specified);
Table 3. Electrical Characteristics
Symbol
Parameter
TAMB
Operating Temperature Range
VDD
Max
Unit
-40
85
°C
Supply Voltage Range
2.3
5.5
V
VOUT
Output Voltage Range
1.25
3.6
V
RON
On Resistance
PSRR 1
Power Supply
Rejection Ratio
f = 1kHz, CREF = 100nF
70
f = 100kHz, CREF = 100nF
60
IOFF
Shut Down Current
ENx = Low, TAMB = +25°C
IVDD
Supply Current
Without Load
tset 1
Output Voltage
Settling Time
tstart 1
Start-up Time 2
VOUT
Output Voltage Tolerance
VLINEREG
Line Regulation, Static
VLOADREG 1
Load Regulation, Static
VIH
Enable Input Voltage High
VIL
Enable Input Voltage Low
ILOAD
Output Current
ILIMIT
Output Current Limitation
VNoise
Output Noise Voltage
Conditions
Min
Typ
Ω
0.5
dB
1
µA
240
µA
ILOAD Switched from 0 to 100mA
50
µs
CREF = 100nF Pre-charged
300
µs
160
CREF = 0nF Uncharged
200
µs
CREF = 100nF Uncharged
15
ms
ILOAD = 0mA, TAMB = 25°C
-1
1
%
ILOAD = 0mA
-2
2
%
VOUT(NOM)+0.3V to 5.4V
-1
1
%
ILOAD = 0 to 50 mA
0.5
2.5
mV
ILOAD = 0 to 300 mA
3
10
mV
1.5
V
0
10Hz to 100kHz, CREF = 100nF
Thermal Protection
0.4
V
300
mA
450
mA
40
µVRMS
150
°C
1. Guaranteed by design and verified by lab evaluation.
2. Startup is performed if any EN pin goes high.
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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AS1355
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
VDD = 4V, VOUT = 3.3V, COUT = 1µF, TAMB = +25°C (unless otherwise specified);
Figure 3. Load Regulation; VOUT vs. IOUT
Figure 4. Line Regulation; VOUT vs. VIN
1.84
3.36
1.83
Output Voltage (V)
3.32
3.3
3.28
3.26
1.82
1.81
1.8
1.79
1.78
1.77
3.24
1.76
50
100
150
200
250
2
300
2.5
Output Current (mA)
4
4.5
5
5.5
75
90
Figure 6. Quiescent Current vs. Temperature
240
3.36
220
Quiescent Current (µA)
3.34
Output Voltage (V)
3.5
Input Voltage (V)
Figure 5. Output Voltage vs. Temp.; IOUT = 1mA
3.32
3.3
3.28
3.26
3.24
-45 -30 -15
3
200
180
160
140
120
100
0
15
30
45
60
75
80
-45 -30 -15
90
Temperature (°C)
1V/Div
VDD
VOUT
VDD
VOUT
15
30
45
60
Figure 8. Startup; RLOAD = 11Ω, no CREF
2V/Div
Figure 7. Startup; no Load, no CREF
50µs/Div
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0
Temperature (°C)
2V/Div
0
1V/Div
Output Voltage (V)
3.34
50µs/Div
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AS1355
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
2ms/Div
2V/Div
EN
VOUT
20µs/Div
10µs/Div
20mV/Div
IOUT = 300 to
100mA/Div
VOUT
IOUT
Figure 14. Load Transient Response;
0mA
20mV/Div
IOUT = 0 to
100mA/Div
VOUT
IOUT
1V/Div
2V/Div
1V/Div
EN
VOUT
Figure 12. Startup; RLOAD = 11Ω, CREF = 100nF (pre-charged)
20µs/Div
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2V/Div
2ms/Div
Figure 11. Startup; no Load, CREF = 100nF (pre-charged)
Figure 13. Load Transient Response;
300mA
1V/Div
VOUT
2V/Div
1V/Div
VOUT
VDD
Figure 10. Startup; RLOAD = 11Ω, CREF = 100nF
VDD
Figure 9. Startup; no Load, CREF = 100nF
500µs/Div
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AS1355
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
Figure 15. AS1355 - Block Diagram
VDD1
VOUT1
Thermal
Overcurrent
Softstart
VREF
EN1
Control
VDD2
VOUT2
Thermal
Overcurrent
Softstart
VREF
EN2
Control
VDD3
VOUT3
Thermal
Overcurrent
Softstart
VREF
EN3
Control
Reference
Voltage
VDDA
AS1355
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Revision 1.3
REF
GND
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AS1355
Datasheet - Ty p i c a l A p p l i c a t i o n
9 Typical Application
Figure 16. Typical Application
+5V
VDD1
VOUT1
3.3V
1µF
VDD2
VOUT2
1µF
1.8V
1µF
1.5V
VOUT3
VDD3
1µF
REF
VDDA
CREF = 100nF
(Improved Noise Performance)
AS1355
EN1
EN2
GND
Microprocessor
EN3
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Revision 1.3
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AS1355
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 17. 16-pin QFN 3x3 Package
Marking: YYWWIZZ.
YY
WW
X
ZZ
last two digits of the current year
manufacturing week
plant identifier
free choice / traceability code
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AS1355
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
Figure 18. 16-pin TQFN 3x3 Package
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Revision 1.3
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AS1355
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 4.
Table 4. Ordering Information
Ordering Code
Marking
AS1355-BQFT-WGD
ASSG
Output
Description
Delivery Form
Package
300mA, Triple LDO
Tape and Reel
16-pin QFN 3x3
300mA, Triple LDO
Tape and Reel
16-pin QFN 3x3
300mA, Triple LDO
Tape and Reel
16-pin TQFN 3x3
300mA, Triple LDO
Tape and Reel
16-pin QFN 3x3
VOUT1 = 3.3V
VOUT2 = 1.8V
VOUT3 = 1.5V
VOUT1 = 3.3V
AS1355-BQFT-WWW
VOUT2 = 3.3V
ASSV
VOUT3 = 3.3V
VOUT1 = 3.3V
AS1355-BQFT-WWD2
VOUT2 = 3.3V
ASTD
VOUT3 = 1.5V
VOUT1*
AS1355-BQFT-xyz*
____
VOUT2*
VOUT3*
* These devices are available in factory-set output voltages from 1.25V to 3.6V in 100mV increments. Choose the desired VOUT suffix from
Table 5 and insert it instead of “xyz” in the part number.
On request also non-standard devices with output voltages between 1.25V and 3.6V in 50mV steps are available.
Table 5. Output Voltage Suffix Guide
Suffix
Min
Typ
Max
Suffix
Min
Typ
Max
Suffix
Min
Typ
A
1.25
J
2.1
S
3.0
B
1.3
K
2.2
T
3.1
C
1.4
L
2.3
V
3.2
D
1.5
M
2.4
W
3.3
E
1.6
N
2.5
X
3.4
F
1.7
O
2.6
Y
3.5
G
1.8
P
2.7
Z
3.6
H
1.9
Q
2.8
2
thin QFN
I
2.0
R
2.9
Max
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AS1355
Datasheet - O r d e r i n g I n f o r m a t i o n
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reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the
copyright owner.
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warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described
devices from patent infringement. ams AG reserves the 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 ams 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
applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing
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production flow, such as test flow or test location.
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Tobelbaderstrasse 30
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Tel
Fax
: +43 (0) 3136 500 0
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