ams Datasheet Page 1
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AS1382
1A, High Efficiency, DC-DC Step Down
Converter
The AS1382 is a high-efficiency, constant-frequency
synchronous buck converter available in adjustabe- and
fixed-voltage versions. The wide input voltage range (2.7V to
5.5V), automatic powersave mode and minimal external
component requirements make the AS1382 perfect for any
single Li-Ion battery-powered application.
Typical supply current with no load is 95μA and decreases to
0.04μA in shutdown mode.
An internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. The
internally fixed switching frequency (2MHz, 3MHz or 4MHz)
allows the usage of small surface mount external components.
Very low output voltages can be delivered with the internal
0.58V feedback reference voltage.
The AS1382 is available in a 6-pin WL-CSP package.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of this device are listed below:
Figure 1:
Added Value of Using AS1382
Applications
The device is ideal for mobile communication devices, laptops
and PDAs, ultra-low-power systems, medical instruments, or
any other space-limited application with low
power-consumption requirements.
Benefits Features
Ideal for single Li-Ion battery powered applications •Wide input voltage range (2.7V to 5.5V)
Extended battery life •High efficiency up to 96%
Supports a variety of end applications
•Output voltage range (0.58V to 3.35V)
•Output current of 1A
•Switching frequency: 2MHz, 3MHz, 4MHz
•High efficiency/low noise operation
Over – temperature protection and shutdown •Integrated temperature monitoring
Cost effective, small package •WL-CSP6 with 0.4mm pitch
General Description
Page 2 ams Datasheet
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AS1382 − General Description
Block Diagram
The functional blocks of this device for reference are shown
below:
Figure 2:
Functional Blocks of AS1382
Block Diagram: Shows the detailed Block Diagram of the AS1382 Step Down DCDC Converter
Lo gic
+
-
+
-
Σ
IMIN
ILIMIT
250mA
1.2A
ISENSEP
ISENSEN
Zero
Comparator
PWM
Comparator
Overvo ltage
Comparator
Ref + 8%
Slope
Com pensat ion
Softstart
Ref = 0.58V
Skip
Clk
buck_v
FB
GND
SW
VIN
+
-
-
+
+
-
MOD E
EN
ams Datasheet Page 3
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AS1382 − Pin Assignments
Figure 3:
6 Balls WL-CSP with 0.4mm Pitch
Figure 4:
Pin Description
Pin Description: Shows the pin number, type, name and description of every pin.
Note(s) and/or Footnote(s):
1. This pin should not be left floating.
Ball Assignments: Shows the TOP view
ball assignment of the AS1382.
Pin # Pin Name Pin Type Description
A1 MODE DIG IN Mode Selection
B1 SW DIG OUT Switch Node Connection to Coil. This pin connects to the drains of
the internal synchronous power MOSFET switches.
C1 FB ANA IN
Feedback Pin. This pin receives the feedback voltage from the
external resistor divider across the output. (Adjustable variant only)
Output Voltage Feedback Pin. An internal resistor divider steps the
output voltage down for comparison to the internal reference
voltage. (Fixed voltage variants only)
A2 VIN SUP IN
Input Supply Voltage. This pin must be closely de-coupled to GND
with a ≥ 4.7uF ceramic capacitor. Connect to any supply voltage
between 2.7V to 5.5V. (1)
B2 EN DIG IN
Enable Input. Driving this pin above 1.2V enables the device. Driving
this pin below 0.4V puts the device in shutdown mode. In shutdown
mode all functions are disabled while SW goes high impedance,
drawing < 1μA supply current. (1)
C2 GND GND Ground
Pin Assignments
A2
VIN
C1
FB
C2
GND
B2
EN
B1
SW
A1
MODE
Pin A1
indicator
Page 4 ams Datasheet
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AS1382 − Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 5:
Absolute Maximum Ratings
Note(s) and/or Footnote(s):
1. Depending on actual PCB layout and PCB used
2. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Nonhermetic Solid State Surface Mount Devices”
Symbol Parameter Min Max Units Comments
Electrical Parameters
VGND Supply Voltage to Ground 5V pins -0.5 7.0 V Applicable for pins VIN, EN,
MODE, FB, SW
Input Current (latch-up immunity) -100 100 mA Norm: JEDEC JESD78
Continuous Power Dissipation (TA = 70°C)
PTContinuous power dissipation 0.55 W PT (1) for WL-CSP6 package
(RTHJA ~95K/W)
Electrostatic Discharge
ESDHBM Electrostatic Discharge HBM ±2 kV Norm:
JEDEC JESD22-A114F
Temperature Ranges and Storage Conditions
TAOperating Temperature -40 85 °C
RTHJA Junction to Ambient Thermal
Resistance 95 °C/W
TJJunction Temperature 125 °C
TSTRG Storage Temperature Range -55 125 °C
TBODY Package Body Temperature 260 °C Norm: IPC/JEDEC
J-STD-020 (2)
RHNC Relative Humidity
non-condensing 585%
MSL Moisture Sensitivity Level 1 Represents an unlimited
floor life time
Absolute Maximum Ratings
ams Datasheet Page 5
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AS1382 − Electrical Characteristics
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
Figure 6:
Electrical Characteristics
Symbol Parameter Note Min Typ Max Unit
VIN Input Voltage Pin VIN 2.7 5.5 V
ISUP_DCDC Current Consumption
Operating Current
without Load 95
uA
Shutdown Current 0.04
IFB Feedback Current TAMB = 25°C 130nA
VFB Feedback Voltage ADJ variant 0.56 0.58 0.60 V
VOUT Regulated Output Voltage
Fixed VOUT variant 0.6125 3.35 V
ADJ variant 0.58 3.35 V
VOUT_TOL Output Voltage Tolerance Fixed output variants,
min. 40mV -3 3 %
ηEFF Efficiency see figures below 96 %
LNR Output Voltage Line Regulation Vin = 2.7V to 5.5V 0.1 %/V
LDR Output Voltage Load Regulation IOUT = 0 to 100mA 0.02 %/mA
ILIMIT Peak Coil Current IOUT = 1A 1.5 A
ILOAD Load Current
VOUT ≤ 1.8V 01A
VOUT > 1.8V 00.7A
IT_COMP Min load to guarantee correct
output voltage in high temp 20 uA
RPMOS P-Channel FET RDS(ON) ILSW = 100mA 0.25 0.55 Ω
RNMOS N-Channel FET RDS(ON) ILSW = -100mA 0.25 0.55 Ω
VIH
Logic in threshold pin EN, MODE
1.2 V
VIL 0.4 V
fSW Switching Frequency
Variant A 4 MHz
Variant B 3 MHz
Variant C 2 MHz
TSHDN Thermal Shutdown 160 °C
ΔTSHDN Thermal Shutdown Hysteresis 25 °C
Electrical Characteristics
Page 6 ams Datasheet
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AS1382 − Typical Operating Characteristics
Electrical Characteristics: Shows the Electrical Characteristics of the DCDC Converter. VIN = EN = 3.7V,
VOUT < VIN – 0.5V, TAMB = –40 to 85°C (unless otherwise specified)
Figure 7:
Efficiency vs. Output Current for Various Output Voltages
Efficiency vs. Output Current: These figures show the Efficiency vs. Output Current for various Output Voltages.
VIN = 3.6V, TAMB = 25°C. Murata LQM2HPN1R0MG0 coil (1uH, DCR 55mΩ).
Figure 8:
Efficiency vs. Output Current for Various Input Voltages
Efficiency vs. Output Current: These
figures show the Efficiency vs. Output
Current for various Input Voltages.
VOUT = 1.0V, TAMB = 25°C, 4MHz.
Murata LQM2HPN1R0MG0 coil
(1uH, DCR 55mΩ).
Typical Operating
Characteristics
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency [%]
Iload [A]
Vout=1.0V, M1, 4MHz
Vout=1.0V, M0, 4MHz
Vout=1.2V, M1, 2MHz
Vout=1.2V, M0, 2MHz
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency [%]
Iload [A]
Vout=1.8V, M1, 3MHz
Vout=1.8V, M0, 3MHz
Vout=3.3V, M1, 4MHz
Vout=3.3V, M0, 4MHz
0
10
20
30
40
50
60
70
80
90
100
0.0010 0.0100 0.1000 1.0000
Efficiency [%]
Iload [A]
Vin=2.7V, M1
Vin=3.7V, M1
Vin=5.5V, M1
Vin=2.7V, M0
Vin=3.7V, M0
Vin=5.5V, M0
ams Datasheet Page 7
[v1-04] 2015-Jun-19 Document Feedback
AS1382 − Typical Operating Characteristics
Figure 9:
Efficiency vs. Input Voltage for Various Load Currents
Efficiency vs. Input Voltage: These
figures show the Efficiency vs. Input
Voltage for various Load Currents.
VOUT = 1.2V, TAMB = 25°C, 2MHz.
Murata LQM2HPN1R0MG0 coil
(1uH, DCR 55mΩ).
0
10
20
30
40
50
60
70
80
90
100
2.5000 3.0000 3.5000 4.0000 4.5000 5.0000 5.5000
Efficiency [%]
Vin [V]
Iload=50mA, M0
Iload=500mA, M0
Iload=50mA, M1
Iload=500mA, M1
Page 8 ams Datasheet
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AS1382 − Detailed Description
The step-down converter is a high efficiency fixed frequency
current mode regulator. By using low resistance internal PMOS
and NMOS switches efficiency up to 96% can be achieved. The
fast switching frequency allows using small inductors, without
increasing the current ripple. The unique feedback and
regulation circuit guarantees optimum load and line regulation
over the whole output voltage range, up to an output current
of 1A with an output capacitor of only 10µF. The implemented
current limitation protects the DCDC and the coil during
overload condition.
Mode Settings
Low-Ripple, Low-Noise Operation
MODE pin = high
In this mode there is no minimum coil current necessary before
switching OFF the PMOS. As result, the ON time of the PMOS
will be reduced down to tmin_on at no or light load conditions,
even if the coil current is very small or the coil current is
inverted. This results in a very low ripple and noise, but
decreased efficiency, at light loads, especially at low input to
output voltage differences. Because of the inverted coil current
in that case the regulator will not operate in pulse skip mode.
Figure 10:
AS1382 Low Noise Mode
DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for low noise operation
Detailed Description
VOUT (50mV/div)
LX (2V/div)
coil current (200mA/div)
time (5us/div)
ams Datasheet Page 9
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AS1382 − Detailed Description
High-Efficiency Operation
MODE pin = low
In this mode there is a minimum coil current necessary before
switching OFF the PMOS. As result there are less pulses at low
output load necessary, and therefore the efficiency at low
output load is increased. This results in higher ripple, and noisy
pulse skip operation up to a higher output current.
Figure 11:
AS1382 High Efficiency Mode
DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for high efficiency operation
It is also possible to switch between these two modes during
operation.
For Example:
MODE pin = low: System is in idle state. No audio, RF signal.
Decreased supply current preferred. Increased ripple doesn’t
affect system performance.
MODE pin = high: System is operating. Audio signal on and/or
RF signal used. Decreased ripple and noise preferred. Increased
power supply current can be tolerated.
VOUT (50mV/div)
LX (2V/div)
coil current (200mA/div)
time (20us/div)
Page 10 ams Datasheet
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AS1382 − Application Information
The AS1382 is perfect for mobile communications equipment
like cell phones and smart phones, digital cameras and
camcorders, portable MP3 and DVD players, PDA’s and palmtop
computers and any other handheld instruments.
Figure 12:
Typical Application Circuit
Typical Application: This figure shows the typical application of the DCDC Step Down Converter.
External Components
Inductors
Figure 13:
Recommended Inductors
Part Number LDCR Current
Rating
Dimensions
(L/W/H) Manufacturer
XFL4020-102 1uH 12mΩ 4.5A 4.3/4.3/2.1 www.coilcraft.com
LQM2HPN1R0MG0 1uH 55mΩ 1.6A 2.5/2.0/0.9 www.murata.com
Application Information
SW
FB
GND
4.7uF
1uH
10uF
V
IN
2.7V to 5.5V V
OUT
1.2 V, 1A
MOD E
EN
VIN
C
IN
C
OUT
AS1382-12
ams Datasheet Page 11
[v1-04] 2015-Jun-19 Document Feedback
AS1382 − Application Information
Ceramic Input and Output Capacitors
When choosing ceramic capacitors for CIN and COUT, the X5R or
X7R dielectric formulations are recommended. These
dielectrics have the best temperature and voltage
characteristics for a given value and size. Y5V and Z5U dielectric
capacitors, aside from their wide variation in capacitance over
temperature, become resistive at high frequencies and
therefore should not be used.
Figure 14:
Recommended Input and Output Capacitors
Because ceramic capacitors lose a lot of their initial capacitance
at their maximum rated voltage, it is recommended that either
a higher input capacity or a capacitance with a higher rated
voltage is used.
Feedback Resistor Selection
In the AS1382-AD, the output voltage is set by an external
resistor divider connected to FB. This circuitry allows for remote
voltage sensing and adjustment.
Figure 15:
Adjustable Variant
AS1382-AD: Shows the application diagram for the adjustable output version with the external resistor divider
Part Number CTC
Code
Voltage
Rating
Dimensions
(L/W/H) Manufacturer
GRM21BR61E475KA12L 4.7uF X5R 25V 0805 www.murata.com
GRM219R60J106KE19D 10uF X5R 6.3V 0805 www.murata.com
SW
FB
GND
1uH
10uF
0.58V ≤ VOUT ≤ 3.3 5V
C
OUT
R1
R2
AS1382-AD
Page 12 ams Datasheet
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AS1382 − Application Information
The Resistor values for the circuit shown above can be
calculated with the following equation:
The output voltage can be adjusted by selecting different
values for R1 and R2. For R2 a value between 10kΩ and 50kΩ is
recommended. To minimize current to FB pin it is
recommended to keep sum of R1 and R2 below 100 kΩ. It is also
recommended to keep VIN 500mV higher than VOUT.
An optional feedback capacitor (CFB) can be added in parallel
with R1 to reduce output ripple. Typical value for the CFB is
below 300pF
PCB Layout
Long printed circuit tracks can generate additional ripple and
noise that mask correct operation and prove difficult to
“de-bug” during production testing. Thus the input loop formed
by CIN, VIN and GND pins should be minimized. Similarly, the
output loop formed by COUT, VOUT and GND should also be
minimized. Figure 16 shows a PCB layout example for the
AS1382.
Figure 16:
PCB Layout Example For The Adjustable Variant
(EQ1)
VOUT 0.58V 1
R1
R2
------
+×=
A1 A2
B1 B2
C1 C2
Vin
En
SW
FB GND
L
1 uH
2.5mm x 2.0mm
Mode
Vout
R2
Cout
10 uF
1.6mm x 0.8mm
Cin
4.7 uF
1.6mm x
0.8mm
R1
Page 14 ams Datasheet
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AS1382 − Package Drawings & Markings
Figure 18:
WL-CSP Marking
Figure 19:
Package Code
AS1382 Package Code: Shows the package code of the WL-CSP
product version
AS1382 Marking: Shows the package
marking of the WL-CSP product version
YYY XXXX
Marking code Tracecode
YYY
XXXX
ams Datasheet Page 15
[v1-04] 2015-Jun-19 Document Feedback
AS1382 − Ordering & Contact Information
Figure 20:
Ordering Information
Ordering Information: Specifies the available variants of the AS1382
Note(s) and/or Footnote(s):
1. Available upon request
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
ams_sales@ams.com
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
Ordering Code Marking Output Description Delivery
Form Package
AS1382-BWLT-ES ABZ Manually programmed
engineering sample T & R 6-pin WL-CSP
AS1382C-BWLT-AD AA6 Adjustable 2MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
AS1382A-BWLT-AD ACD Adjustable 4MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
AS1382A-BWLT-10 (1) AA7 1.0V 4MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
AS1382A-BWLT-12 (1) ABW 1.2V 4MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
AS1382A-BWLT-15 (1) ABX 1.5V 4MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
AS1382C-BWLT-18 ABY 1.8V 2MHz, 1A Synchronous
DCDC Converter T & R 6-pin WL-CSP
Ordering & Contact Information
Page 16 ams Datasheet
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AS1382 − RoHS Compliant & ams Green Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG bases its knowledge and belief
on information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues
to take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
RoHS Compliant & ams Green
Statement
ams Datasheet Page 17
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AS1382 − Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 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.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
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
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 by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation
or liability to recipient or any third party shall arise or flow out
of ams AG rendering of technical or other services.
Copyrights & Disclaimer
Page 18 ams Datasheet
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AS1382 − Document Status
Document Status Product Status Definition
Product Preview Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Preliminary Datasheet Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Datasheet Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Datasheet (discontinued) Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
Document Status
ams Datasheet Page 19
[v1-04] 2015-Jun-19 Document Feedback
AS1382 − Revision Information
Note(s) and/or Footnote(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
Changes from 1-02 (2015-Apr-23) to current revision 1-04 (2015-Jun-19) Page
1-02 (2015-Apr-23) to 1-03 (2015-Jun-17)
Updated text under General Description & Figure 1 1
Updated Figure 2 2
Updated Figure 6 5
Updated Figure 15 11
Updated EQ1 12
1-03 (2015-Jun-17) to 1-04 (2015-Jun-19)
Updated Figure 6 5
Updated Figure 17 13
Revision Information
Page 20 ams Datasheet
Document Feedback [v1-04] 2015-Jun-19
AS1382 − Content Guide
1 General Description
1 Key Benefits & Features
1 Applications
2 Block Diagram
3 Pin Assignments
4Absolute Maximum Ratings
5 Electrical Characteristics
6 Typical Operating Characteristics
8 Detailed Description
8Mode Settings
8 Low-Ripple, Low-Noise Operation
9 High-Efficiency Operation
10 Application Information
10 External Components
10 Inductors
11 Ceramic Input and Output Capacitors
11 Feedback Resistor Selection
12 PCB Layout
13 Package Drawings & Markings
15 Ordering & Contact Information
16 RoHS Compliant & ams Green Statement
17 Copyrights & Disclaimer
18 Document Status
19 Revision Information
Content Guide
