AMS AMS3132M-XX-PG 3a fast transient linear regulator Datasheet

AMS3132
3A Fast Transient Linear Regulator
General Description
Features
The AMS3132 is a high performance linear regulator
with very low dropout voltage and excellent transient
response. It is designed to operate with wide input
voltage range of 1.5 – 7Volts making it ideal for two
step conversion while maintaining high efficiency for
many power sensitive applications. The device is
capable of supplying 3A of output current with a
typical dropout voltage of 700mV at 3A. The product
is available in either fixed or adjustable output
voltage.
The linear regulator has been optimized for noise
sensitive applications.
The device includes an
optional enable pin for electrical on/off of the
regulator. Forcing the enable pin to logic low shuts
down the LDO and reduces the supply current to
less than 1µA.
The product includes complete short-circuit and
thermal protection. The combination of these two
internal protection circuits gives the device a
comprehensive safety system to safe guard against
extreme adverse operating conditions.
The AMS3132 is available in a 5-pin surface mount
TO263 package, and it is rated for -40°C to +125°C
temperature range.
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VIN range: 1.5 – 7V
Fixed and Adjustable output voltage as low
as 0.6V
3A maximum output current
700mV typical dropout voltage at 3A
Low self noise
Optional Power Good (PG) output
Optional Enable (EN) pin for LDO on/off
125µA typical supply current
PSRR >40dB at 10KHz
Stable with Electrolytic, Tantalum or
Ceramic capacitors
Current Limit protection
Over-Temperature Shutdown
-40 to +125°C temperature range
Available in a 5-pin surface mount TO-263
package
RoHS & WEEE compliant
Applications
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Set-top Box
DVD, Blue-ray DVD writers
LCD TVs and LCD monitors
Battery Powered Equipment
Infotainment
Wireless & RF Applications
High Efficiency “Green” Laptops & notebook
Typical Application
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AMS3132
3A Fast Transient Linear Regulator
Pin Description (TO-263 5-Pin Package)
Pin #
Symbol
Description
EN
Enable pin. It controls the electrical on/off of the device. When connected to logic
low, the device shuts off and consumes less than 1µA of current. Logic high will
resume normal operation.
PG
Power Good pin. It is an open collector, active high output that indicates the
status of the output voltage. When output voltage (VOUT) exceeds the PG trip
threshold, the PG pin goes in to a high impedance state. When the device is out
of regulation or shutdown, the PG pin is pulled low. A 10KΩ to 1MΩ resistor
should be connected from PG to VOUT.
2
VIN
Input supply Voltage. It powers the internal control circuitry and the internal power
switch. Bypass VIN with at ceramic capacitor from this pin to ground.
3
GND
Ground connection.
4
VOUT
Output Voltage
ADJ
Provides feedback to error amplifier from the resistive divider that sets the output
voltage.
PG
Power Good pin. It is an open collector, active high output that indicates the
status of the output voltage. When output voltage (VOUT) exceeds the PG trip
threshold, the PG pin goes in to a high impedance state. When the device is out
of regulation or shutdown, the PG pin is pulled low. A 10KΩ to 1MΩ resistor
should be connected from PG to VOUT.
1
5
Pin Configuration
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AMS3132
3A Fast Transient Linear Regulator
Absolute Maximum Ratings (1)
Recommended Operating Conditions (2)
Maximum Input Supply Voltage (VIN)………......…. ……-0.3V to 15V
Enable Voltage (EN)…………..…..……………….……...-0.3V to 15V
Power Good (PG).……………..…..……….……………...-0.3V to 15V
Adjustable Voltage (ADJ)……………………….………… -0.3V to 3V
Storage Temperature Range……………...................-65⁰C to 150⁰C
Lead Temperature…………………..………….………..……… 260⁰C
Junction Temperature………...………………..…………..…… 125⁰C
Input Voltage…………………………………….………….. 1.5V to 7V
Ambient Operating Temperature………….………… -40⁰C to 125⁰C
Thermal Information
TO263-5 θJA
(3)
…………………………....…………...….…...30⁰C/W
Electrical Characteristics
Unless otherwise noted: VIN=3.3V; VOUT=1.8V; CIN=10 µF ; COUT=22µF; -40⁰C≤TA=TJ≤85⁰C; TJ(Max.)= 125°C; Typical values are TA=25°C
Parameter
Output Voltage Accuracy
Adjustable Voltage
Adjustable pin bias current
Maximum Output Current
Load Regulation
Line Regulation
Supply Current
Shutdown Current
Current Limit
Dropout Voltage
Symbol
VOUT
VADJ
IADJ_Bias
IOUT_Max
ISUP
ISHDN
ILIM
VDO
ΔVOUT/ΔVIN
PSRR
Output Noise Voltage
Enable Threshold Low
Enable Threshold High
Input Enable Low Current
Input Enable High Current
en
VEN(L)
VEN(H)
IEN(L)
IEN(H)
Conditions
Adjustable VOUT only
Adjustable VOUT only
Min.
-3
0.588
Typ.
Max.
Units
0.6
10
3
0.612
100
%
V
nA
A
%
%
mA
µA
A
3
IOUT= 0 – 3A
VIN=3.0 – 7.0V; IOUT=100mA
VIN=3.3V, Io=0A
VIN=3.3V, VEN=0V
0.1
0.1
0.6
<1
6
IOUT=0.1A; VOUT=95% of VOUT(NOM)
60
IOUT=1A; VOUT=95% of VOUT(NOM)
220
IOUT=2A; VOUT=95% of VOUT(NOM)
420
IOUT=3A; VOUT=95% of VOUT(NOM)
700
F=10KHz Io=20mA
40
dB
BW= 100Hz –100 KHz
COUT = 22µF
IOUT = 2.75A
125
µV(rms)
Optional EN Pin present
Optional EN Pin present
VEN = 0V
VEN = 1.5V
1.2
1.3
0
150
V
V
nA
nA
Power Good Low Threshold
VPG
% of VOUT PG ON / Opt. PG pin only
Power Good High Threshold
VPG
% of VOUT PG OFF / Opt. PG pin only
Power Good Output Low Voltage
VPGL
IPG_SINK = 500μA, Fault Condition
200
Power Good Leakage Current
Thermal Shutdown
Thermal Shutdown Hysteresis
IPG
TSD
PG off, VPG = 12V
0.01
145
15
Notes:
1.
2.
3.
TSD_HYS
1
3
mV
10
300
89
%
97
%
300
mV
μA
°C
°C
Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device.
Junction to ambient thermal resistance with the TO-263 package tab soldered to a double side printed circuit board with 2.5 in2 of (1 oz.) copper area.
With package soldering to 0.5in2 copper area over backside ground plane or internal power plane θJA can vary from 20°C/W to >40°C/W depending on
mounting technique. The thermal resistance Junction to Case is 45⁰C/W. Total power dissipation for the switching regulator and the LDO should be taken
in consideration when calculating the output current capability of each regulator.
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A
AMS3
3132
3A Fas
st Transien
nt Linear Regulator
1.804
Ou
utput Voltage
e Temperaturre Variation
(Fixed Voltage Option) VO = 1.8V
Adjustable Voltage (V)
Output
p Voltage
g (V)
( )
Ty
ypical Perfo
ormance Characteris
C
stics (TA = 25°C
2
unless otherwise
o
sp
pecified)
1.802
1.800
1.798
1.796
1.794
1.792
0.601
0.600
0.599
0.598
0.597
25
0
25
5 50 75 100 125
-2
Ambient Te
emperature (ºC)
(
Dro
opout Voltag
ge vs. Tempe
erature
1.0
3A
0.8
0.1
0.0
-0.1
-0.2
0.6
2A
0.4
0.2
1A
0.0
3
4
5
6
Input Voltage (V)
7
-50
-2
25
0
25
5 50 75 100 125
Ambient Te
emperature (°C)
pout Voltage
e vs. Output Current
Drop
Load
d Regulation
n
0.3
0.7
0.6
0.2
Voltage (V)
Output Voltage Change (%)
0.602
-50
Line Regullation VOUT = 2.5V
0.2
0.603
-25
0
25 50 75
5 100 125
5
Ambient Temperature
T
e (ºC)
Voltage (V)
Output
p Voltage
g Error (%)
( )
-50
Ad
djust (ADJ) Voltage
V
Temp
perature
Variation (Adjus
stable Voltage Option)
0.1
0.0
-0.1
0.5
0.4
0.3
0.2
-0.2
0.1
-0.3
0.0
0.0
02/11/2010
0
0.1
1.0
Outputt Current (A)
10..0
VOUT
= 2.5V
O
0
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dvanced-mono
olithic.com
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0.5
1
1.5
2
2.5
Output Current (A)
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AMS3132
3A Fast Transient Linear Regulator
IGND vs. Output Current VO=2.5V, VIN=3.3V
Shutdown Current vs. Input Voltage
2.0
Ground Current (mA)
Shutdown Current (µA)
Typical Performance Characteristics (TA = 25°C unless otherwise specified)
1.5
125°C
1.0
25°C
0.5
‐50°C
0.0
0
1
2
3
4
5
6
7
70
60
50
40
30
20
10
0
0.0
0.5
1.0
1.5
2.5
3.0
Output Current (A)
Input Voltage (V)
Load Transient
200mA to 2.8A, VOUT=2.5V,VIN=3.6V, CIN=COUT=22µF
Enable Start-Up
2.5A, VOUT=2.5V,VIN=3.3V, CIN=COUT=22µF
V OUT
1V /div
V OUT
50mVac
/div
ISW OUT
1A
/div
Enable
1V/div
100 µsec/div
10 µsec/div
02/11/2010
2.0
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AMS3132
3A Fast Transient Linear Regulator
Functional Block Diagram
Figure 1: Block Diagram of AMS3132 5-Pin TO-263 Fixed Voltage with Power Good Option
Figure 2: Block Diagram of AMS3132 5-Pin TO-263 Adjustable Voltage Option
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AMS3132
3A Fast Transient Linear Regulator
Functional Block Diagram
Figure 3: Block Diagram of AMS3132 5-Pin TO-263 Adjustable Voltage with Power Good Option
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AMS3132
3A Fast Transient Linear Regulator
Device Summary
The AMS3132 is a high voltage low drop out linear
regulator with a current capability of up to 3A. The
LDO has a recommended operating input voltage
range of 1.5V to 7V with an output voltage as low as
0.6V and is stable with a wide range of ceramic,
tantalum, and electrolytic output capacitors.
Shutdown/Enable
The Enable (on/off) input threshold voltage is 1.2V.
When disabled the LDO quiescent current decreases
to a typical value of <1µA.
Fault Protection
Short circuit and over-temperature shutdown disable
the converter and LDO in the event of an overload
condition. Over-temp shutdown disables the device
when the junction temperature exceeds 145 ºC. The
output current is internally limited to 6A typical.
Input Capacitor
An input bypass capacitor ranging from 1µF to 22µF
is required. The capacitor should be placed as close
as possible to the device and not be placed more than
1 inch from the LDO.
Output Capacitor
The output capacitor requirements range from the
minimum value required to guarantee stability to
larger values required to meet the extreme transient
response requirements. Values range from 10 to
22µF X5R ceramic capacitors. Due to the extreme
voltage coefficient of X5R ceramic capacitors, the
voltage rating should be at least double the maximum
applied voltage.
Adjustable Version: Feedback Resistor Selection
Choosing AMS3132 with adjustable output voltage
option allows the user to select an output voltage by
using an external resistor divider. AMS 3132 uses a
0.6V reference voltage at the positive terminal of the
error amplifier. To set the output voltage a
programming resistor from the adjust pin (ADJ) to
ground must be selected (See Pg.1). A 10kΩ resistor
is a good selection for a programming resistor R1. A
higher value may result in an excessively sensitive
feedback node while a lower value will draw more
current and degrade the light load efficiency. The
equation for selecting the voltage specific resistor is:
R2=
Vout
Vref
02/11/2010
-1 ·R1 =
5V
0.6V
-1 ·10kΩ=73.2kΩ
Table 1: Adjustable Feedback Resistor values
R2 (kΩ)
Vout (V)
(R1=10kΩ)
1.8
20.0
2.5
31.6
3.3
45.3
5.0
73.2
Power Good Version
During operation, fault conditions can occur
unexpectedly. Such conditions include input voltage
dropout (low VIN), overheating, or overloading
(excessive output current). If any of these conditions
occurs, the PG pin will set an “error flag”. The PG pin,
which is an open-collector output, will go LOW when
VOUT is less than 95% or the specified output voltage.
When the voltage at VOUT is greater than 95% of the
specified output voltage, the PG pin is HIGH. A logic
pull-up resistor of 10KΩ is recommended at this
output. The pin can be left disconnected if unused.
PCB Layout
The following guidelines should be followed to insure
proper layout.
1. VIN Capacitor. A low ESR ceramic bypass
capacitor must be placed as close to the IC as
possible.
2. Adjustable (ADJ) Feedback Resistors. The
adjustable feedback resistors should be placed as
close as possible the IC. Minimize the length of
the trace from the feedback pin to the resistors.
This is a high impedance node susceptible to
interference from external RF noise sources
3. Ground.
4. For good thermal performance vias are required
to couple the tab of the TO-263 package to the
PCB ground plane. The via diameter should be
0.3mm to 0.33mm positioned on a 1.2mm grid.
Output Power and Thermal Limits
The AMS3132 junction temperature and current
capability depends on the internal dissipation and the
junction to case thermal resistance of the TO-263
exposed tab packages. Additionally, the tab paddle
and PCB temperature will be elevated due to the total
losses of the LDO and of other circuits mounted to the
PCB.
Tjmax=Pd·θjc+Tpcb+Tamb
The internal losses contribute to the junction
temperature rise above the paddle and PCB
temperature.
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AMS3132
3A Fast Transient Linear Regulator
Figure 4: AMS3132 TO-263 5-Pin Evaluation Board
Top Side
Figure 5: AMS3132 TO-263 5-Pin Evaluation Board
Bottom Side
R3 *5
10k
PG
Enable/PG
C7 *6
U1
1
Vin
2
3
C3 *1
470uF
C4 *2
22uF
C1
22uF
EN/PG GND
VIN ADJ/PG
GND VOUT
6
R2 *3
5
4
AMS3132
C2
22uF
R1 *4
10k
Vout
C5 *1
470uF
C6 *2
22uF
gnd
gnd
C1, C2 22uF X5R 1210 10V Ceramic Capaci tor
*1. Optional Electrolyti c Capaci tor in place of Ceramic Capacitor
*2. Optional Tantalum Capacitor in place of Ceramic Capacitor
*3. 10k for AMS3132M-PG, Table 2 for AMS3132M and AMS3132-XX-PG
*4. Not used for AMS3132M-PG, 10k for AMS3132M and AMS3132-XX-PG
*5. Not used for AMS3132M-PG and AMS3132M, 10k for AMS3132-XX-PG
*6. Optional Feedforward Capacitor (1nF to 10nF Typical)
gnd
Figure6: AMS3132 Universal Evaluation Board Schematic
Component
C1,C2
C3,C5,C4,C6
C7
R1
R2
R3
02/11/2010
Value
Table 2: AMS3132 Universal Evaluation Board Bill of Material
Manufacturer
AMS3132 Version
Manufacturer Part Number
22µF, 10V, X5R, 0805,
Ceramic
Optional
Optional
10kΩ, 0.1W, 0603 1%
Taiyo Yuden
See table 2
Various
10kΩ, 0.1W, 0603 1%
10kΩ, 0.1W, 0603 1%
Various
Various
Various
any
any
any
AMS3132M, or
AMS3132-XX-PG
AMS3132M, or
AMS3132-XX-PG
AMS3132M-PG
AMS3132-XX-PG
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LMK212BJ226MG-T
CRCW060310K0FKEA
CRCW0603xxKxFKEA
CRCW060310K0FKEA
CRCW060310K0FKEA
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AMS3132
3A Fast Transient Linear Regulator
Ordering Information
Device
AMS3132M-XX-PG(1)(2)(3)
TO-263 5-Pin
AMS3132M (1)(2)
TO-263 5-Pin
AMS3132M-PG
(1)(2)
Package
TO-263 5-Pin
Notes:
1. Available in tape and reel only. A reel contains 2,500 devices.
2. Available in lead-free package only. Device is fully WEEE and RoHS compliant
3. Need to specify output voltage option ( )
Outline Drawing and Landing Pattern
Package dimensions are inches (millimeters) unless otherwise noted.
0.390 -0.415
(9.906-10.541)
0.060
(1.524)
TYP
0.165-0.180
(4.191-4.572)
+0.008
-0.004
+0.203
( 0.102
-0.102
0.004
0.330 -0.370
(8.382 -9.398)
0.199 -0.218
(5.05-5.54)
0.057-0.077
(1.447-1.955)
02/11/2010
0.032
(0.81)
TYP
0.045-0.055
(1.143-1.397)
0.108
(2.74)
TYP
0.013-0.023
(0.330-0.584)
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)
0.095-0.115
(2.413-2.921)
0.90-0.110
(2.29-2.79)
M (DD5) AMS
DRW#042192R1
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