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ACT6702 Schematic ( PDF Datasheet ) - Active-Semi

Teilenummer ACT6702
Beschreibung MobileLDO High Performance Low Dropout Regulators
Hersteller Active-Semi
Logo Active-Semi Logo 




Gesamt 10 Seiten
ACT6702 Datasheet, Funktion
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






ACT6702 Datasheet, Funktion
ACT6700/6701/6702
LOW NOISE BYPASS (ACT6702)
The ACT6702 includes a low noise reference
bypass pin BYP to filter high frequency noise to
the error amplifier and a startup circuitry to fast
charge BYP when the IC is turned on. Connect a
10nF capacitor from BYP pin to ground to reduce
output noise to 40µVRMS. The startup time with
10nF bypass capacitor is about 250µs.
APPLICATION INFORMATION
INPUT CAPACITOR
Any good quality capacitor with 1µF or
greater value can be used as an input capacitor
for the ACT670_. Connect the input capacitor as
close to IN and G as possible. Ceramic
capacitors have better performance and lower
ESR (Equivalent Series Resistance) than other
types of capacitors, and are recommended.
OUTPUT CAPACITOR
The ACT670_ LDOs need output capacitors
for stability. These capacitors should be
connected as close to OUT and G as possible to
maximize performance. The output capacitance
and ESR ranges for stability are shown in the
Typical Performance Characteristics. However,
to ensure best performance for the device, the
output capacitor should have a minimum
capacitance of 1µF, and an ESR value between
10mand 500m. High quality ceramic
capacitors with X7R or X5R dielectric types are
strongly recommended.
POWER-GOOD OUTPUT
When using the ACT6701's power-good
indicator output, connect an external 100k
pull-up resistor from PG to VOUT or to another
supply rail. A low level indicates that the output
voltage is out of regulation and can be used to
reset the load. A capacitor can be added
between PG and ground to add rising edge delay
to the reset signal.
BYPASS PIN CAPACITOR
For the ACT6702 low noise bypass pin, the
capacitor type and capacitor material is not as
critical as input and output capacitors. Any good
quality 10nF capacitor can be used in this
application. Capacitor with larger amount of
capacitance will increase the startup time. It is
critical that the PCB traces for the connection of
the capacitor should be direct and as short as
possible.
Active-Semi, Inc.
- 6 - www.active-semi.com

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