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PDF AAT3258 Data sheet ( Hoja de datos )
| Número de pieza | AAT3258 | |
| Descripción | LDO Linear Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3258
300mA LDO Linear Regulator with µP Reset
General Description
Features
PowerLinear™
The AAT3258 combines a high performance, low
• Integrated LDO Regulator with µP Reset
noise, 300mA low dropout (LDO) linear regulator
• 300mA Output LDO Regulator
with a microprocessor reset monitor. The 300mA
• Low Dropout Regulator, 400mV at 300mA
output capability of the LDO regulator makes this
• High LDO Output Voltage Accuracy, Typically
device ideal for use with microprocessors and DSP
1.5%
cores in portable products. The microprocessor
• Very Low Noise and High Power Supply
reset monitor section has very low quiescent cur-
Rejection Ratio (PSRR) LDO
rent consumption and has an active low reset out-
• Low Quiescent Current at 71µA
put. The AAT3258 has separate input pins for the
• LDO Over-Current/Short-Circuit Protection
reset monitor and LDO regulator so they may be
• LDO Over-Temperature Protection
operated from independent sources for increased
• LDO Power Saving Shutdown Mode
design flexibility. This device features very low qui-
• Independent Device Power Inputs
escent current, typically less than 71µA.
• High Accuracy Reset Monitor Threshold: ±1.5%
The LDO regulator has low dropout voltage, typical-
ly 400mV at the full output current level, making it
ideal for portable applications where extended bat-
tery life is critical. The AAT3258 LDO regulator sec-
tion has complete over-current/short-circuit and
over-temperature protection circuits to guard against
• Active Low Push-Pull Monitor Reset Output
• <2.0µA of Shutdown Current
• Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
• -40°C to +85°C Temperature Range
• 8-Pin TSOPJW Package
extreme operating conditions. The device also has
an active output pull down function when disabled.
www.DataSheet4U.com
The AAT3258 is available in a Pb-free, space-sav-
ing 8-pin TSOPJW package. This device is capa-
Applications
ble of operation over a -40°C to +85°C temperature
range.
• Cellular Phones
• Digital Cameras
• Handheld Instrumentation
• Microprocessor/DSP Core/IO Power
• Notebook Computers
• PDAs and Handheld Computers
• Portable Communication Devices
Typical Application
100k
VIN
1µF
µP Reset
Manual Reset
LDO Shutdown
VDET
RESET
VIN VOUT
AAT3258
MR GND
SHDN
BYP
10nF
RESET OUT
LDO VOUT
2.2µF
3258.2006.03.1.6
1
1 page  
AAT3258
300mA LDO Linear Regulator with µP Reset
Electrical Characteristics1
TA = 25°C, unless otherwise noted.
Symbol Description
Microprocessor Reset Monitor
VDET
Input Voltage Range
IQ
IDD
IDOFF
VTH
∆VTH/°C
TP
TRDY
TMR
MRGI
RMR
TMD
VIH
VIL
Quiescent Current
Operating Supply Current
Reset Leakage Current
Reset Threshold Voltage
RESET Threshold Tempco
Reset Propagation Delay
Reset Active Timeout Period
MR Minimum Pulse Width
MR Glitch Immunity
MR Pull-Up Resistance
MR to Reset Propagation
Delay
MR Input Threshold (high)
MR Input Threshold (low)
VOL Reset Low Voltage
VOH Reset High Voltage
Conditions
Min Typ Max Units
TA = 0°C to +70°C
TA = -40°C to +85°C
VCC = 5.5V
VCC = 3.0V
VDET = 3.0V
VDET > VTH
TA = 25°C
AAT3258xxx-x.x-R
AAT3258xxx-x.x-Y
1
1.2
2.59
2.41
VDET = VTH to (VTH - 100mV)
150
10
30
1.05
0.85
0.85
2.63
2.45
40
15
250
100
65
5.5
5.5
3.0
2.0
2.0
1.0
2.67
2.49
400
90
V
µA
µA
µA
V
ppm/°C
µs
ms
µs
ns
kΩ
0.5 µs
VDET = VTH(MAX)
0.7 × VDET
VDET = VTH(MAX)
ISINK = 1.2mA, VDET = VTH(MIN),
VTH ≤ 3.08V, Reset Asserted
ISINK = 3.2mA, VDET = VTH(MIN),
VTH > 3.08V, Reset Asserted
ISOURCE = 800µA, VDET > 3.08V,
VDET > VTH(MAX)
VDET - 1.5
ISOURCE = 500µA, VDET >
VTH(MAX), VTH ≤ 3.08V
0.8 * VDET
0.25 × VDET
0.3
0.4
V
V
V
V
1. The AAT3258 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.
3258.2006.03.1.6
5
5 Page 
AAT3258
300mA LDO Linear Regulator with µP Reset
The microprocessor reset section monitors the supply
voltage to a microprocessor and asserts a reset sig-
nal whenever the VDET voltage falls below a factory-
programmed threshold. This threshold is accurate
within +/-1.5% at 25°C. The reset signal remains
asserted for a minimum of 150ms after VDET has risen
above the threshold, as shown in Figure 1.
To assure the maximum possible performance is
obtained from the AAT3258, please refer to the fol-
lowing application recommendations.
VDET
VTH
VTH
VTH
RESET
tRDY
tRDY
Figure 1: Reset Signal Assertion.
LDO Regulator Applications
Input Capacitor
Typically, a 1µF or larger capacitor is recommend-
ed for CIN in most applications. A CIN capacitor is
not required for basic LDO regulator operation.
However, if the AAT3258 is physically located more
than three centimeters from an input power source,
a CIN capacitor will be needed for stable operation.
CIN should be located as closely to the device VIN
pin as practically possible. CIN values greater than
1µF will offer superior input line transient response
and will assist in maximizing the highest possible
power supply ripple rejection.
Ceramic, tantalum, or aluminum electrolytic capaci-
tors may be selected for CIN. There is no specific
capacitor ESR requirement for CIN. However, for
300mA LDO regulator output operation, ceramic
capacitors are recommended for CIN due to their
inherent capability over tantalum capacitors to with-
stand input current surges from low impedance
sources such as batteries in portable devices.
Output Capacitor
For proper load voltage regulation and operational
stability, a capacitor is required between pins VOUT
and GND. The COUT capacitor connection to
the LDO regulator ground pin should be made as
direct as practically possible for maximum device
performance.
The AAT3258 has been specifically designed to func-
tion with very low ESR ceramic capacitors. For best
performance, ceramic capacitors are recommended.
Typical output capacitor values for maximum output
current conditions range from 1µF to 10µF.
Applications utilizing the exceptionally low output
noise and optimum power supply ripple rejection
characteristics of the AAT3258 should use 2.2µF or
greater for COUT. If desired, COUT may be increased
without limit.
In low output current applications where output
load is less than 10mA, the minimum value for
COUT can be as low as 0.47µF.
3258.2006.03.1.6
11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT3258.PDF ] | |
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