The AMS3120 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 2A of output current with a
typical dropout voltage of 550mV at 2A. 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
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 AMS3120 is available in a thermally enhanced
SOIC-8 EDP package, and it is rated for -40°C to
+125°C temperature range.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
V
IN
range: 1.5 – 7V
Fixed and Adjustable output voltage as low
as 0.6V
2A maximum output current
550mV typical dropout voltage at 2A
Low self noise
Optional Power Good (PG) output
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
Thermally enhanced SOIC-8 exposed
paddle package
RoHS & WEEE compliant
Applications
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Set-top Box
DVD, Blue-ray DVD writers
LCD TVs and LCD monitors
Infotainment
Wireless & RF: applications
Laptops & notebook
Typical Application
V
IN
= 3.3V
V
IN
V
OUT
*
V
OUT
=1.8V
AMS3120
C
IN
=10μF
EN
PG
*
ADJ
*
GND
C
OUT
= 22μF
* Optional Power Good, Fixed and Adjustable V
OUT
are available
02/11/2010
www.advanced-monolithic.com
1
Phone (925) 443-0722
Fax (925) 443-0723
AMS3120
2A Fast Transient Linear Regulator
Pin Description (SO-8EP package)
Pin #
1
2
3
Symbol
NC
EN
V
IN
NC
4
No connection
Enable pin. It controls the electrical on/off of the device. When connected to logic
low, the device shuts off and consumes 1µA of current. A logic high will resume
normal operation.
Input supply Voltage. It powers the internal control circuitry and the internal power
switch. Bypass V
IN
with at ceramic capacitor from this pin to ground.
No Connection
Power Good pin. It is an open collector, active high output that indicates the status
of the output voltage. When output voltage (V
OUT
) 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 V
OUT
.
No Connection
Output Voltage
Provides feedback to error amplifier from the resistive divider that sets the output
voltage.
No Connection
Ground
Description
PG
5
6
7
8,9
NC
V
OUT
ADJ
NC
GND
Pin Configuration
SO-8EP (Top View)
02/11/2010
www.advanced-monolithic.com
2
Phone (925) 443-0722
Fax (925) 443-0723
AMS3120
2A Fast Transient Linear Regulator
Absolute Maximum Ratings
(1)
Maximum Input Supply Voltage……………..........….… -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
Recommended Operating Conditions
(2)
Input Voltage………………………………...….………….. 1.5V to 7V
Ambient Operating Temperature……………….…… -40⁰C to 125⁰C
Thermal Information
8L SOIC EP
θ
JA
(3)
…………………………....……….….…...45⁰C/W
Electrical Characteristics
Unless otherwise noted: V
IN
=3.3V; V
OUT
=1.8V; C
IN
=10 µF; C
OUT
=22µF; -40⁰C≤T
A
=T
J
≤85⁰C;
T
J(Max)
= 125°C; Typical values are T
A
= 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
Symbol
V
OUT
V
ADJ
I
ADJ_Bias
I
OUT_Max
Conditions
Adjustable V
OUT
only
Adjustable V
OUT
only
I
OUT
= 0 – 2A
V
IN
=3.0 – 7.0V; I
OUT
=100mA
V
IN
=3.3V, Io=0A
V
IN
=3.3V, V
EN
=0V
I
OUT
=0.1A; V
OUT
=90% of V
OUT(NOM)
Dropout Voltage
V
DO
I
OUT
=0.5A; V
OUT
=90% of V
OUT(NOM)
I
OUT
=1A; V
OUT
=90% of V
OUT(NOM)
I
OUT
=2A; V
OUT
=90% of V
OUT(NOM)
PSRR
Output Noise Voltage
Enable Threshold Low
Enable Threshold High
Input Enable Low Current
Input Enable High Current
Power Good Low Threshold
Power Good High Threshold
Power Good Output Low Voltage
Power Good Leakage Current
Thermal Shutdown
Thermal Shutdown Hysteresis
Notes:
1.
2.
3.
Min.
-3
0.588
2
Typ.
0.6
10
0.1
0.2
0.2
<1
2.5
85
180
275
550
40
125
1.2
1.3
Max.
3
0.612
100
Units
%
V
nA
A
%
%
mA
µA
A
I
SUP
I
SHDN
I
LIM
0.5
3
mV
ΔV
OUT
/ΔV
IN
e
n
V
EN(L)
V
EN(H)
I
EN(L)
I
EN(H)
V
PG
V
PG
V
PGL
I
PG
T
SD
T
SD_HYS
F=10KHz Io=20mA
BW = 100Hz –100 KHz
C
OUT
= 10µF
I
OUT
= 500mA
dB
µV(rms)
V
V
10
300
97
nA
nA
%
%
mV
μA
°C
°C
V
EN
= 0V
V
EN
= 1.5V
% of V
OUT
PG ON
% of V
OUT
PG OFF
IPG_SINK = 500μA, Fault Condition
PG off, V
PG
= 12V
89
0
150
200
0.01
145
15
300
Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device.
Measured on approximately 1” square of 1 oz. copper.
The total power dissipation for SO-8 EDP package is recommended to 2.5W rated at 25⁰C ambient temperature. 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
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