AMS3109 Datasheet PDF - AMS


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AMS3109
AMS

Part Number AMS3109
Description Micropower 700mA Low Noise Fast Transient Response LDO
Page 10 Pages

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AMS3109
Micropower 700mA Low Noise Fast Transient Response LDO
General Description
The AMS3109 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 – 12Volts making it ideal for two
step conversion while maintaining high efficiency for
many power sensitive applications. The device is
capable of supplying 700mA of output current with a
typical dropout voltage of 550mV. The product is
available in 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 below 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 AMS3109 is available in a thermally enhanced
SOIC-8 EDP package, and it is rated for -40°C to
+125°C temperature range.
Typical Application
Features
VIN range: 1.5 – 12V
Adjustable output voltage as low as 0.6V
700mA maximum output current
550mV typical dropout voltage at 700mA
Low self noise
Enable (EN) pin for LDO on/off
120µA typical supply current
ByPass (CBYP) Pin for low PSRR and output
noise
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
ASIC Power Supplies In:
¾ Set-top Boxes, Desktops, Notebooks
¾ Graphic Cards, Printers and Copiers
DVD, Blue-Ray DVD writers
LCD TVs and LCD monitors
Infotainment
Wireless & RF: applications
DSP and FPGA Power Supplies
Medical Instrumentation
SMPS Post-Regulator
02/11/2010
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AMS3109
Micropower 700mA Low Noise Fast Transient Response LDO
Pin Description (SOIC-8 EDP package)
Pin #
1
2
3
4
5
6
7
8
9
Symbol
BYP
NC
GND
VIN
VOUT
ADJ
NC
EN
GND
Description
Reference Bypass pin. Connect an external capacitor from CBYP to ground to
bypass the noise generated by the internal bandgap. This improves power supply
rejection ratio and output noise.
No Connection
Ground
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.
Output Voltage
Provides feedback to error amplifier from the resistive divider that sets the output
voltage.
No Connection
Enable pin. It controls the electrical on/off of the device. When connected to logic
low, the device shuts off and consumes less than1µA of current. Logic high will
resume normal operation.
Expose pad. Connected to PCB ground plane for good thermal dissipation.
Pin Configuration
SOIC-8EDP (Top View)
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AMS3109
Micropower 700mA Low Noise Fast Transient Response LDO
Absolute Maximum Ratings (1)
Maximum Input Supply Voltage (VIN)………....……..… -0.3V to 15V
Enable Voltage (EN)……………..…..………….……… -0.3V to 15V
Adjustable Voltage (ADJ).……...………………………… -0.3V to 3V
ByPass Voltage (BYP)…………..…..…………………… -0.3V to 3V
Storage Temperature Range……………................. -65C to 150C
Lead Temperature…………………..…………...……………… 260C
Junction Temperature………...………………..…..…………… 125C
Recommended Operating Conditions (2)
Input Voltage……………………………..……….……….. 1.5V to 12V
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
Symbol
Conditions
Min. Typ. Max. Units
Output Voltage Accuracy
VOUT
-3 3 %
Adjustable Voltage
Adjustable bias current
VADJ
IADJ_Bias
0.588 0.600 0.612
10 100
V
nA
Maximum Output Current
IOUT_Max
700 mA
Load Regulation
IOUT= 0 – 700mA
0.6 %
Line Regulation
Supply Current
VIN=3.0 – 12V; IOUT=100mA
ISUP VIN=3.3V, Io=0A
0.15
120 150
%
µA
Shutdown Current
ISHDN
VIN=3.3V, VEN=0V
<1 µA
Current Limit
ILIM
800 mA
IOUT=100mA; VOUT=95% of VOUT(NOM)
220
Dropout Voltage
VDO
IOUT=250mA; VOUT=95% of VOUT(NOM)
IOUT=500mA; VOUT=95% of VOUT(NOM)
300
425
mV
PSRR
ΔVOUT/ΔVIN
IOUT=750mA; VOUT=95% of VOUT(NOM)
F=10KHz Io=20mA
600
33
dB
Output Noise Voltage
Enable Threshold Low
Enable Threshold High
Input Enable Low Current
Input Enable High Current
Thermal Shutdown
Thermal Shutdown Hysteresis
en
VEN(L)
VEN(H)
IEN(L)
IEN(H)
TSD
TSD_HYS
BW: 100Hz–100 KHz
COUT = 22µF
ILOAD = 150mA
No CBYP
CBYP = 10nF
VEN = 0V
VEN = 1.5V
118
µV(rms)
33
1
1.1
0 10
150 300
145
15
V
V
nA
nA
°C
°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
02/11/2010
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AMS3109
Micropower 700mA Low Noise Fast Transient Response LDO
Typical Performance Characteristics (TA = 25°C unless otherwise specified)
Adjust (ADJ) Voltage Temperature
0.606 Variation (Adjustable Voltage Option)
Line Regulation VO = 1.8V, IO = 100mA
0.2
0.604
0.602
0.1
0.0
-0.1
0.600
-50
-25 0 25 50 75 100 125
Ambient Temperature (ºC)
-0.2
3
69
Input Voltage (V)
12
30 IGND vs. Output Current VO=1.8V, Vin=2.5V
50°C
25
20
15 25°C
10
5
0 100°C
0 100 200 300 400 500 600 700
Output Current (A)
50 Shutdown Current vs. Input Voltage
125°C
40
30
20
25°C
10
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Input Voltage (V)
Load Regulation
0.2
0
-0.2
-0.4
02/11/2010
-0.6
0.0
0.1
Output Current (A)
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