|
|
PDF AAT3242 Data sheet ( Hoja de datos )
| Número de pieza | AAT3242 | |
| Descripción | Dual CMOS LDO Linear Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AAT3242 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
General Description
Features
PowerLinear™
The AAT3242 is a dual low dropout linear regulator
with Power OK (POK) outputs. Two integrated reg-
ulators provide a high power 300mA output and a
lower power 150mA output, making this device
ideal for use with microprocessors and DSP cores
in portable products. Two POK pins provide open
drain output signals when their respective regulator
output is within regulation. The AAT3242 has inde-
pendent input voltage and enable pins for increased
design flexibility. This device features a very low
quiescent current (140µA typical) and low dropout
voltages (typically 200mV and 400mV at the full
output current level), making it ideal for portable
applications where extended battery life is critical.
The AAT3242 has complete over-current/short-cir-
cuit and over-temperature protection circuits to
guard against extreme operating conditions.
• High/Low Current Outputs, 300mA/150mA
• Low Dropout:
— LDO A: 400mV at 300mA
— LDO B: 200mV at 150mA
• High Output Voltage Accuracy: ±1.5%
• High PSRR: 65dB at 1kHz
• 70µA Quiescent Current for Each LDO
• Over-Current/Short-Circuit Protection
• Over-Temperature Protection
• Two POK Outputs
• Independent Power and Enable Inputs
• Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
• 12-Pin TSOPJW Package
• -40°C to +85°C Temperature Range
The AAT3242 is available in a space-saving, Pb-
free, 12-pin TSOPJW package. This device is
Applications
capable of operation
perature range.
over
the
-40°C
to
+85°C
tem-
•
•www.DataSheet4U.com
•
Cellular Phones
Digital Cameras
Handheld Instruments
• Microprocessor / DSP Core / I/O Power
• Notebook Computers
• PDAs and Handheld Computers
• Portable Communication Devices
Typical Application
VIN INA OUTA
AAT3242
100kΩ
Enable A
ENA
POKA
POKA
OUTPUT A
Enable B
INB
ENB
OUTB
POKB
GND
100kΩ
POKB
2.2μF
OUTPUT B
2.2μF
3242.2006.04.1.10
1
1 page  
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
Electrical Characteristics1 (continued)
VIN = VOUT(NOM) + 1.0V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT ≤ 1.5V. IOUT = 1.0mA, COUT =
2.2µF, CIN = 1.0µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
LDO B; IOUT = 150mA
VOUT
Output Voltage Tolerance
VIN
VDO
ΔVOUT/
VOUT*ΔVIN
ΔVOUT(Line)
Input Voltage
Dropout Voltage2, 3
Line Regulation4
Dynamic Line Regulation
ΔVOUT(Load)
VEN(L)
VEN(H)
VPOK
VPOKHYS
VPOK(LO)
IPOK
IOUT
ISC
IQ
Dynamic Load Regulation
Enable Threshold Low
Enable Threshold High
Power OK Trip Threshold
Power OK Hysteresis
Power OK Output Voltage Low
POK Output Leakage Current
Output Current
Short-Circuit Current
Ground Current
PSRR Power Supply Rejection Ratio
TSD
THYS
eN
TC
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Output Noise
Output Voltage Temperature
Coefficient
Conditions
Min Typ Max Units
IOUT = 1mA TA = 25°C
-1.5
1.5
to 150mA TA = -40 to 85°C
-2.5
2.5
VOUT + VDO5
5.5
IOUT = 150mA
200 300
VIN = VOUT + 1 to 5.0 V
0.09
%
V
mV
%/V
IOUT = 150mA, VIN = VOUT + 1
to VOUT + 2, TR/TF = 2µS
IOUT = 1mA to 150mA, TR <5µS
VOUT Rising, TA = 25°C
ISINK = 1mA
VPOK < 5.5V, VOUT in Regulation
VOUT > 1.2V
VOUT < 0.4V
VIN = 5V, No Load; EN B = VIN
1kHz
IOUT = 10mA 10kHz
1MHz
1.5
90
150
5.0 mV
60
0.6
94 98
1.0
0.4
1.0
600
70 125
65
45
42
145
mV
V
V
% of VOUT
% of VOUT
V
µA
mA
mA
µA
dB
°C
12 °C
eNBW = 300Hz to 50kHz
250 µVRMS
22 ppm/°C
1. The AAT3242 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal.
3. For VOUT < 2.3V, VDO = 2.5 - VOUT.
4. CIN = 10µF.
5. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.
3242.2006.04.1.10
5
5 Page 
AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
of X7R dielectric is better than ±15%. Capacitor
area is another contributor to ESR. Capacitors
which are physically large in size will have a lower
ESR when compared to a smaller sized capacitor
of an equivalent material and capacitance value.
These larger devices can improve circuit transient
response when compared to an equal value capac-
itor in a smaller package size. Consult capacitor
vendor datasheets carefully when selecting capac-
itors for LDO regulators.
POK Output
The AAT3242 features integrated Power OK com-
parators which can be used as an error flag. The
POK open drain output goes low when output volt-
age is 6% (typ) below its nominal regulation volt-
age. Additionally, any time one of the regulators is
in shutdown, the respective POK output is pulled
low. Connect a pull-up resistor from POKA to
OUTA, and POKB to OUTB.
Enable Function
The AAT3242 features an LDO regulator enable/dis-
able function. Each LDO has its own dedicated
enable pin. These pins (EN) are active high and are
compatible with CMOS logic. To assure the LDO
regulators will switch on, ENA/B must be greater
than 1.6V. The LDO regulators will shut down when
the voltage on the ENA/B pins falls below 0.6V. In
shutdown, the AAT3242 will consume less than
1.0µA of current. If the enable function is not need-
ed in a specific application, it may be tied to VIN to
keep the LDO regulator in a continuously on state.
When the LDO regulators are in shutdown mode,
an internal 20Ω resistor is connected between
VOUT and GND. This is intended to discharge COUT
when the LDO regulators are disabled. The internal
20Ω has no adverse effects on device turn-on time.
Short-Circuit Protection
The AAT3242 contains internal short-circuit protec-
tion that will trigger when the output load current
exceeds the internal threshold limit. Under short-
circuit conditions, the output of the LDO regulator
will be current limited until the short-circuit condi-
tion is removed from the output or LDO regulator
package power dissipation exceeds the device
thermal limit.
Thermal Protection
The AAT3242 has an internal thermal protection cir-
cuit which will turn on when the device die temper-
ature exceeds 145°C. The LDO regulator output will
remain in a shutdown state until the internal die
temperature falls back below the 145°C trip point.
The combination and interaction between the short-
circuit and thermal protection systems allows the
LDO regulators to withstand indefinite short-circuit
conditions without sustaining permanent damage.
No-Load Stability
The AAT3242 is designed to maintain output volt-
age regulation and stability under operational no-
load conditions. This is an important characteristic
for applications where the output current may drop
to zero.
Reverse Output-to-Input Voltage
Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the LDO reg-
ulator. The input voltage should always remain
greater than the output load voltage maintaining a
reverse bias on the internal parasitic diode.
Conditions where VOUT might exceed VIN should be
avoided since this would forward bias the internal
parasitic diode and allow excessive current flow into
the VOUT pin, possibly damaging the LDO regulator.
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during nor-
mal operation, the use of a larger value CIN capaci-
tor is highly recommended. A larger value of CIN with
respect to COUT will effect a slower CIN decay rate
during shutdown, thus preventing VOUT from
exceeding VIN. In applications where there is a
greater danger of VOUT exceeding VIN for extended
periods of time, it is recommended to place a
Schottky diode across VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky
diode forward voltage should be less than 0.45V.
3242.2006.04.1.10
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT3242.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AAT3242 | Dual CMOS LDO Linear Regulator | AAT |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |