AS1382

AS1382
1A, High Efficiency, DC-DC Step Down
Converter
General Description
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
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
•
•
•
•
Over – temperature protection and shutdown
• Integrated temperature monitoring
Cost effective, small package
• WL-CSP6 with 0.4mm pitch
Output voltage range (0.58V to 3.35V)
Output current of 1A
Switching frequency: 2MHz, 3MHz, 4MHz
High efficiency/low noise operation
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.
ams Datasheet
[v1-04] 2015-Jun-19
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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
IMIN
250mA
+
MODE
Clk
1.2A
+
VIN
ILIMIT
+
-
Ref + 8%
ISENSEP
Overvo ltage
Comparator
SW
Logic
Σ
ISENSEN
+
Zero
Comparator
Skip
GND
+
PWM
Comparator
-
EN
Ref = 0.58V
FB
Slope
Compensation
buck_v
Softstart
Block Diagram: Shows the detailed Block Diagram of the AS1382 Step Down DCDC Converter
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AS1382 − Pin Assignments
Pin Assignments
Figure 3:
6 Balls WL-CSP with 0.4mm Pitch
Ball Assignments: Shows the TOP view
ball assignment of the AS1382.
Pin A1
indicator
A1
MODE
A2
VIN
B1
SW
B2
EN
C1
FB
C2
GND
Figure 4:
Pin Description
Pin #
Pin Name
Pin Type
A1
MODE
DIG IN
B1
SW
DIG OUT
Description
Mode Selection
Switch Node Connection to Coil. This pin connects to the drains of
the internal synchronous power MOSFET switches.
Feedback Pin. This pin receives the feedback voltage from the
external resistor divider across the output. (Adjustable variant only)
C1
A2
FB
VIN
ANA IN
Output Voltage Feedback Pin. An internal resistor divider steps the
output voltage down for comparison to the internal reference
voltage. (Fixed voltage variants only)
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)
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)
B2
EN
DIG IN
C2
GND
GND
Ground
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.
ams Datasheet
[v1-04] 2015-Jun-19
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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.
Absolute Maximum Ratings
Figure 5:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Applicable for pins VIN, EN,
MODE, FB, SW
Electrical Parameters
VGND
Supply Voltage to Ground 5V pins
-0.5
7.0
V
Input Current (latch-up immunity)
-100
100
mA
Norm: JEDEC JESD78
Continuous Power Dissipation (TA = 70°C)
PT
Continuous power dissipation
0.55
W
PT (1) for WL-CSP6 package
(RTHJA ~95K/W)
kV
Norm:
JEDEC JESD22-A114F
Electrostatic Discharge
ESDHBM
Electrostatic Discharge HBM
±2
Temperature Ranges and Storage Conditions
TA
RTHJA
TJ
Operating Temperature
85
°C
Junction to Ambient Thermal
Resistance
95
°C/W
Junction Temperature
125
°C
125
°C
260
°C
85
%
TSTRG
Storage Temperature Range
TBODY
Package Body Temperature
RHNC
Relative Humidity
non-condensing
MSL
Moisture Sensitivity Level
-40
-55
5
1
Norm: IPC/JEDEC
J-STD-020 (2)
Represents an unlimited
floor life time
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”
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AS1382 − Electrical Characteristics
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
VIN
ISUP_DCDC
Parameter
Input Voltage
Current Consumption
Note
Pin VIN
Typ
2.7
Operating Current
without Load
95
Shutdown Current
0.04
IFB
Feedback Current
TAMB = 25°C
VFB
Feedback Voltage
ADJ variant
VOUT
Min
Fixed VOUT variant
Max
Unit
5.5
V
uA
1
30
nA
0.58
0.60
V
0.6125
3.35
V
0.58
3.35
V
-3
3
%
96
%
0.56
Regulated Output Voltage
ADJ variant
Output Voltage Tolerance
Fixed output variants,
min. 40mV
ηEFF
Efficiency
see figures below
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_TOL
VOUT ≤ 1.8V
0
1
A
VOUT > 1.8V
0
0.7
A
IT_COMP
Min load to guarantee correct
output voltage in high temp
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
Logic in threshold
pin EN, MODE
20
VIH
1.2
V
VIL
fSW
uA
0.4
Switching Frequency
V
Variant A
4
MHz
Variant B
3
MHz
Variant C
2
MHz
TSHDN
Thermal Shutdown
160
°C
ΔTSHDN
Thermal Shutdown Hysteresis
25
°C
ams Datasheet
[v1-04] 2015-Jun-19
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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)
Typical Operating
Characteristics
Figure 7:
Efficiency vs. Output Current for Various Output Voltages
90
80
80
70
70
Efficiency [%]
100
90
Efficiency [%]
100
60
50
40
Vout=1.0V, M1, 4MHz
60
50
40
30
Vout=1.0V, M0, 4MHz
30
20
Vout=1.2V, M1, 2MHz
20
10
Vout=1.2V, M0, 2MHz
10
0
0.001
0.01
Iload [A] 0.1
Vout=1.8V, M1, 3MHz
Vout=1.8V, M0, 3MHz
Vout=3.3V, M1, 4MHz
Vout=3.3V, M0, 4MHz
0
0.001
1
0.01
Iload [A] 0.1
1
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).
100
90
80
Efficiency [%]
70
60
50
40
Vin=2.7V, M1
30
Vin=3.7V, M1
Vin=5.5V, M1
20
Vin=2.7V, M0
10
0
0.0010
Vin=3.7V, M0
Vin=5.5V, M0
0.0100
0.1000
1.0000
Iload [A]
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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).
100
90
80
Efficiency [%]
70
60
50
40
Iload=50mA, M0
30
Iload=500mA, M0
20
Iload=50mA, M1
10
0
2.5000
ams Datasheet
[v1-04] 2015-Jun-19
Iload=500mA, M1
3.0000
3.5000
4.0000
Vin [V]
4.5000
5.0000
5.5000
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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.
Detailed Description
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
coil current (200mA/div)
LX (2V/div)
VOUT (50mV/div)
time (5us/div)
DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for low noise operation
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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
coil current (200mA/div)
LX (2V/div)
VOUT (50mV/div)
time (20us/div)
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.
ams Datasheet
[v1-04] 2015-Jun-19
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AS1382 − Application Information
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
VIN
2.7V to 5.5V
VIN
C IN
EN
AS1382-12
VOUT
1.2V, 1A
1uH
SW
C OUT
FB
10uF
4.7uF
GND
MODE
Typical Application: This figure shows the typical application of the DCDC Step Down Converter.
External Components
Inductors
Figure 13:
Recommended Inductors
Part Number
L
DCR
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
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ams Datasheet
[v1-04] 2015-Jun-19
AS1382 − Application Information
Ceramic Input and Output Capacitors
When choosing ceramic capacitors for C IN 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
Part Number
C
TC
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
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
SW
AS1382-AD
FB
GND
1uH
0.58V ≤ V OUT ≤ 3.35V
R1
R2
COUT
10uF
AS1382-AD: Shows the application diagram for the adjustable output version with the external resistor divider
ams Datasheet
[v1-04] 2015-Jun-19
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AS1382 − Application Information
The Resistor values for the circuit shown above can be
calculated with the following equation:
(EQ1)
R1
V OUT = 0.58V × 1 + -----R2
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 R 1 and R2 below 100 kΩ. It is also
recommended to keep VIN 500mV higher than V OUT.
An optional feedback capacitor (C FB) can be added in parallel
with R 1 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 C IN, V IN 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
Mode
SW
L
1 uH
2.5mm x 2.0mm
Vin
A1
A2
B1
B2
C1
C2
Cin
4.7 uF
1.6mm x
0.8mm
FB
En
GND
Cout
10 uF
1.6mm x 0.8mm
R1
R2
Vout
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ams Datasheet
[v1-04] 2015-Jun-19
AS1382 − Package Drawings & Markings
Package Drawings & Markings
Figure 17:
6 Balls WL-CSP With 0.4mm Pitch
RoHS
Green
Note(s) and/or Footnote(s):
1. Pin 1 = A1
2. ccc Coplanarity
3. All dimensions are in μm
ams Datasheet
[v1-04] 2015-Jun-19
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AS1382 − Package Drawings & Mark ings
Figure 18:
WL-CSP Marking
YYY
XXXX
AS1382 Marking: Shows the package
marking of the WL-CSP product version
Figure 19:
Package Code
YYY
XXXX
Marking code
Tracecode
AS1382 Package Code: Shows the package code of the WL-CSP
product version
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[v1-04] 2015-Jun-19
AS1382 − Ordering & Contact Information
Ordering & Contact Information
Figure 20:
Ordering Information
Description
Delivery
Form
Package
Manually programmed
engineering sample
T&R
6-pin WL-CSP
Adjustable
2MHz, 1A Synchronous
DCDC Converter
T&R
6-pin WL-CSP
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 Code
Marking
AS1382-BWLT-ES
ABZ
AS1382C-BWLT-AD
AA6
AS1382A-BWLT-AD
Output
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
ams Datasheet
[v1-04] 2015-Jun-19
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AS1382 − RoHS Compliant & ams Green Statement
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.
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AS1382 − Copyrights & Disclaimer
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.
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AS1382 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
Page 18
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Product Status
Definition
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
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
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
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
ams Datasheet
[v1-04] 2015-Jun-19
AS1382 − Revision Information
Revision Information
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
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.
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AS1382 − Content Guide
Content Guide
Page 20
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1
1
1
2
General Description
Key Benefits & Features
Applications
Block Diagram
3
4
5
6
Pin Assignments
Absolute Maximum Ratings
Electrical Characteristics
Typical Operating Characteristics
8
8
8
9
Detailed Description
Mode Settings
Low-Ripple, Low-Noise Operation
High-Efficiency Operation
10
10
10
11
11
12
Application Information
External Components
Inductors
Ceramic Input and Output Capacitors
Feedback Resistor Selection
PCB Layout
13
15
16
17
18
19
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
ams Datasheet
[v1-04] 2015-Jun-19