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PDF ACT6710 Data sheet ( Hoja de datos )

Número de pieza ACT6710
Descripción MobileLDO HIGH PERFORMANCE LOW DROPOUT REGULATORS
Fabricantes Active-Semi 
Logotipo Active-Semi Logotipo



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ACT6700/6701/6702
ACT6710/6711/6712
Datasheet ACT6700/6701/6702
Rev 1, 10/2004 ACT6710/6711/6712
MobileLDOTM HIGH PERFORMANCE
LOW DROPOUT REGULATORS
FEATURES
110mV typical dropout with 150mA Load
Very Low 23µA Supply Current
1.5% Voltage Accuracy
450mA (ACT670_) or 700mA (ACT671_) Typical
Current Limit
Thermal Shutdown Protection
Fold-back Current Limit Protection
1.8V to 3.3V Fixed Output Voltage
Power-Good Indicator
Low Noise Bypass Pin
Stability with Wide Range of Capacitors
Compact SOT23-3 and SOT23-5 Packages
APPLICATIONS
Cellular Handsets
Battery-Powered Equipment
Personal Communication Devices
Portable Information Devices
Peripherals, Consumer Electronics
GENERAL DESCRIPTION
The ACT670_ and ACT671_ MobileLDOTM
series products are high performance low
dropout voltage regulators designed for portable
applications with very low quiescent current
(23uA) and dropout voltage (110mV at 150mA).
The ACT6710/6711/6712 LDOs have typical
current limit of 700mA. The ACT6700/6701/6702
LDOs have typical current limit of 450mA. Both
series are available in high accuracy (1.5%)
output voltages from 1.8V to 3.3V in 50mV
increments. All of these products feature thermal
shutdown protection and current limit with
fold-back in short circuit.
The ACT6700 and ACT6710 are available in
SOT23-3 package. The ACT6701 and ACT6711
are available in SOT23-5 package and include a
power-good indicator output. The ACT6702 and
ACT6712 are available in SOT23-5 package and
include 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
ACT6710
G
1µF
OUTPUT
INPUT
1µF
ENABLE
IN OUT
ACT6701
ACT6711
EN G PG
OUTPUT
1µF
100k
READY
INPUT
1µF
ENABLE
IN OUT
ACT6702
ACT6712
EN G BYP
1µF
10nF
OUTPUT
Figure 1. Typical MobileLDOTM Application Circuits
Active-Semi, Inc.
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ACT6710 pdf
ACT6700/6701/6702/6710/6711/6712
IN
Available on ACT6701/6711
Available on ACT6702/6712
EN †‡
BYP
THERMAL
SHUTDOWN
CURRENT
LIMIT
ERROR
AMP
−+
REFERENCE
&
BIAS
93%VREF
+
Figure 2. Functional Block Diagram
G
OUT
PG
FUNCTIONAL DESCRIPTION
The ACT670_ and ACT671_ series are high
performance LDOs with very low quiescent
current consumption.
As illustrated in Figure 2, Functional Block
Diagram, the ACT670_ and ACT671_ LDO
architecture consists of a low noise reference
and bias circuitry, an error amplifier, feedback
voltage resistor divider, 0.74P-channel power
MOSFET pass transistor, current limiter, and
thermal shutdown circuitry. In addition, the
ACT6701/6711 also contain a power-good
comparator with indicator output and shutdown
control. The ACT6702/6712 also contain 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 700mA for the ACT671_ and 450mA for
the ACT670_. However, for output voltage lower
than 1V, the current limit folds back to 1/3 of its
original value.
THERMAL SHUTDOWN
If the die temperature exceeds the thermal
protection threshold of 160°C, the IC turns off to
allow for the die to cool down. When the die
temperature decreases to about 137°C, the IC
turns on again, resulting in a thermal cycling
mode.
SHUTDOWN CONTROL
The ACT6701/6702/6711/6712 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 (ACT6701/6711)
The power-good comparator in the
ACT6701/6711 detect when the output voltage
falls below regulation point (93% of normal VOUT)
and pull the PG open 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.
LOW NOISE BYPASS (ACT6702/6712)
The ACT6702/6712 include a low noise
Active-Semi, Inc.
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