AMS3120 Datasheet PDF - AMS


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AMS3120
AMS

Part Number AMS3120
Description 2A Fast Transient Linear Regulator
Page 9 Pages

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General Description
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.
Typical Application
AMS3120
2A Fast Transient Linear Regulator
Features
VIN 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
Set-top Box
DVD, Blue-ray DVD writers
LCD TVs and LCD monitors
Infotainment
Wireless & RF: applications
Laptops & notebook
VIN= 3.3V
CIN=10μF
VIN VOUT*
AMS3120
EN PG*
ADJ*
GND
VOUT=1.8V
COUT = 22μF
* Optional Power Good, Fixed and Adjustable VOUT are available
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AMS3120
Pin Description (SO-8EP package)
2A Fast Transient Linear Regulator
Pin #
1
2
3
4
5
6
7
8,9
Symbol
NC
EN
VIN
NC
PG
NC
VOUT
ADJ
NC
GND
Description
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 VIN 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 (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 10Kto 1Mresistor should be
connected from PG to VOUT.
No Connection
Output Voltage
Provides feedback to error amplifier from the resistive divider that sets the output
voltage.
No Connection
Ground
Pin Configuration
SO-8EP (Top View)
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AMS3120
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……………................. -65C to 150C
Lead Temperature…………………..………….……………..… 260C
Junction Temperature………...………………..…………..…… 125C
2A Fast Transient Linear Regulator
Recommended Operating Conditions (2)
Input Voltage………………………………...….………….. 1.5V to 7V
Ambient Operating Temperature……………….…… -40C to 125C
Thermal Information
8L SOIC EP θJA (3) …………………………....……….….…...45C/W
Electrical Characteristics
Unless otherwise noted: VIN=3.3V; VOUT=1.8V; CIN=10 µF; COUT=22µF; -40CTA=TJ85C; 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
Symbol
VOUT
VADJ
IADJ_Bias
IOUT_Max
ISUP
ISHDN
ILIM
Conditions
Adjustable VOUT only
Adjustable VOUT only
IOUT= 0 – 2A
VIN=3.0 – 7.0V; IOUT=100mA
VIN=3.3V, Io=0A
VIN=3.3V, VEN=0V
IOUT=0.1A; VOUT=90% of VOUT(NOM)
Min.
-3
0.588
2
Typ.
0.6
10
Max.
3
0.612
100
0.1
0.2
0.2 0.5
<1 3
2.5
85
Units
%
V
nA
A
%
%
mA
µA
A
Dropout Voltage
IOUT=0.5A; VOUT=90% of VOUT(NOM)
180
VDO mV
IOUT=1A; VOUT=90% of VOUT(NOM)
275
IOUT=2A; VOUT=90% of VOUT(NOM)
550
PSRR
Output Noise Voltage
ΔVOUT/ΔVIN
en
F=10KHz Io=20mA
BW = 100Hz –100 KHz
COUT = 10µF
IOUT = 500mA
40 dB
125 µV(rms)
Enable Threshold Low
VEN(L)
1.2 V
Enable Threshold High
VEN(H)
1.3 V
Input Enable Low Current
IEN(L)
VEN = 0V
0 10 nA
Input Enable High Current
IEN(H)
VEN = 1.5V
150 300
nA
Power Good Low Threshold
Power Good High Threshold
VPG % of VOUT PG ON
VPG % of VOUT PG OFF
89 %
97 %
Power Good Output Low Voltage
VPGL
IPG_SINK = 500μA, Fault Condition
200 300
mV
Power Good Leakage Current
Thermal Shutdown
Thermal Shutdown Hysteresis
IPG
TSD
TSD_HYS
PG off, VPG = 12V
0.01 μA
145 °C
15 °C
Notes:
1.
2.
3.
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 25C ambient temperature. The thermal resistance Junction to Case
is 45C/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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AMS3120
2A Fast Transient Linear Regulator
Typical Performance Characteristics (TA = 25°C unless otherwise specified)
Output Voltage Temperature Variation
1.808
(Fixed Voltage Option) VO = 1.8V
1.806
1.804
1.802
1.800
1.798
1.796
1.794
1.792
-50 -25 0 25 50 75 100 125
Ambient Temperature (ºC)
Adjust (ADJ) Voltage Temperature
0.605 Variation (Adjustable Voltage Option)
0.603
0.601
0.599
0.597
0.595
-50
-25 0 25 50 75 100 125
Ambient Temperature (ºC)
Line Regulation VOUT = 2.5V
0.2
0.1
0.0
-0.1
-0.2
3
456
Input Voltage (V)
7
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
0.0
Load Regulation
0.1 1.0
Output Current (A)
10.0
Dropout Voltage vs. Temperature
1.0
0.8
0.6 2 A
0.4
0.2
0.0
-50
1 A
-25 0 25 50 75 100
Ambient Temperature (°C)
125
0.6 Dropout Voltage vs. Output Current
0.5
0.4
0.3
0.2
0.1 VOUT = 2.5V
0.0
0
0.5 1 1.5
Output Current (A)
2
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