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PDF ACT6701 Data sheet ( Hoja de datos )
| Número de pieza | ACT6701 | |
| Descripción | MobileLDO High Performance Low Dropout Regulators | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Data Sheet ACT6700/6701/6702
Rev 6, 5/2006
MobileLDOTM High Performance
Low Dropout Regulators
FEATURES
110mV Typical Dropout with 150mA Load
Very Low 23µA Supply Current
1.5% Voltage Accuracy
450mA Typical Current Limit
Thermal Shutdown Protection
Fold-back Current Limit Protection
1.5V to 5V Fixed Output Voltages
Power-Good Indicator (ACT6701)
Low Noise Bypass Pin (ACT6702)
Stable with Wide Range of Capacitance
Compact SOT23-3 and SOT23-5 Packages and
also SOT89-3 for ACT6700
APPLICATIONS
Cellular Handsets
Battery-Powered Equipment
Personal Communication Devices
Portable Information Devices
Peripherals, Consumer Electronics
GENERAL DESCRIPTION
The ACT670_ MobileLDOTM series products
are high performance low dropout voltage
regulators designed for portable applications with
very low quiescent current (23µA) and dropout
voltage (110mV at 150mA).
The ACT670_ LDOs have typical current limit
of 450mA and are available in high accuracy
(1.5%) output voltages from 1.5V to 5V in 50mV
increments. These products feature thermal
shutdown protection and current limit with
fold-back in short circuit.
The ACT6700 is available in the SOT23-3
and SOT89-3 packages. The ACT6701 is
available in the SOT23-5 package and includes a
power-good indicator output. The ACT6702 is
available in the SOT23-5 package and includes a
low noise bypass pin for low noise applications.
These products are ideal for portable information
devices, cellular phones, and other battery
powered applications.
INPUT
IN OUT
1µF ACT6700
UT/KT
G
1µF
OUTPUT
INPUT
1µF
ENABLE
IN OUT
ACT6701
UC
EN G PG
OUTPUT
1µF
100k
READY
INPUT
1µF
ENABLE
IN OUT
ACT6702
UC
EN G BYP
1µF
10nF
OUTPUT
Figure 1. Typical MobileLDOTM Application Circuits
Active-Semi, Inc.
- 1 - www.active-semi.com
1 page  
ACT6700/6701/6702
Figure 2. Functional Block Diagram
FUNCTIONAL DESCRIPTION
The ACT670_ series are high performance
LDOs with very low quiescent current
consumption.
As illustrated in Figure 2, Functional Block
Diagram, the ACT670_ LDO architecture
consists of a low noise reference and bias
circuitry, an error amplifier, feedback voltage
resistor divider, 0.74Ω P-channel power
MOSFET pass transistor, current limiter, and
thermal shutdown circuitry. In addition, the
ACT6701 also contains a power-good
comparator with indicator output and shutdown
control. The ACT6702 contains low noise
reference bypass and shutdown control.
VOLTAGE REGULATION
Normally, the LDO's error amplifier compares
the output feedback voltage (via the resistor
divider) with the reference voltage and generates
an error signal that is used to drive the P-channel
power MOSFET. When the output voltage is
higher than the needed value, the P-channel is
driven off so that there is no output current.
When the output voltage is lower than the
needed value, the P-channel conducts to
increase the output to its desired value.
CURRENT LIMIT
When the output current is at the current limit
value, the current limiter circuitry pulls back the
power MOSFET gate to prevent its current from
increasing further. This current limit value is
typically 450mA for the ACT670_. However, for
output voltage lower than 1V, the current limit
folds back to one-third of its original value.
THERMAL SHUTDOWN
If the die temperature exceeds the thermal
protection threshold of 155°C, the IC turns off to
allow for the die to cool down. When the die
temperature decreases to about 135°C, the IC
turns on again, resulting in a thermal cycling
mode.
SHUTDOWN CONTROL
The ACT6701/6702 have an enable input EN
for turning the IC on or off. When EN is less than
0.4V, the IC is in low leakage current shutdown
mode. When EN is higher than 1.5V, the IC is in
normal mode.
POWER-GOOD INDICATOR (ACT6701)
The power-good comparator in the ACT6701
detects when the output voltage falls below
regulation point (93% of normal VOUT) and pulls
the PG open to drain output low to indicate a
fault condition. When the output voltage is higher
than 94.5% of normal VOUT, the PG output
becomes high impedance. When IC is in
shutdown, the PG output is also high impedance.
Active-Semi, Inc.
- 5 - www.active-semi.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ACT6701.PDF ] | |
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