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PDF AP7340 Data sheet ( Hoja de datos )
| Número de pieza | AP7340 | |
| Descripción | 150mA HIGH PSRR LOW NOISE LDO | |
| Fabricantes | Diodes | |
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AP7340
150mA HIGH PSRR LOW NOISE LDO WITH ENABLE
Description
The AP7340 is low dropout regulator with high output voltage
accuracy, low RDSON, high PSRR, low output noise and low quiescent
current. This regulator is based on a CMOS process.
The AP7340 includes a voltage reference, error amplifier, current limit
circuit and an enable input to turn it on and off. With the integrated
resistor network fixed output voltage versions can be delivered.
With its low power consumption and line and load transient response
the AP7340 is well suited for low power handheld communication
equipment.
The AP7340 is packaged in a X2-DFN1010-4 package and allows for
smallest footprint and dense PCB layout.
Features
● Low VIN and wide VIN range: 1.7V to 5.25V
● Guarantee Output Current,150mA
● VOUT accuracy ±1%
● Ripple Rejection 75dB at 1kHz
● Low output noise, 60uVrms from 10Hz to 100kHz
● Quiescent current as low as 35µA
● VOUT fixed 1.2V to 3.3V
● Totally Lead-Free & and Fully RoHS Compliant (Note 1)
● Halogen and Antimony Free, Green Device (Note 2)
Pin Assignments
PIN1 – VOUT, PIN2 – GND, PIN3 – EN, PIN4 – VIN
Applications
Smart phone/PAD
RF supply
Cameras
Portable Video
Portable Media player
Wireless adapter
Wireless communication
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
Figure 1 Typical Application Circuit
AP7340
Document number: DS35282 Rev. 2 - 2
1 of 15
www.diodes.com
October 2013
© Diodes Incorporated
Free Datasheet http://www.datasheet4u.com/
1 page  
Typical Characteristics (cont.)
AP7340
AP7340
Document number: DS35282 Rev. 2 - 2
5 of 15
www.diodes.com
October 2013
© Diodes Incorporated
Free Datasheet http://www.datasheet4u.com/
5 Page 
AP7340
Application Information
Output Capacitor
An output capacitor (COUT) is needed to improve transient response and maintain stability. The AP7340 is stable with very small ceramic output
capacitors. The ESR (equivalent series resistance) and capacitance drives the selection. If the application has large load variations, it is
recommended to utilize low-ESR bulk capacitors. It is recommended to place ceramic capacitors as close as possible to the load and the ground
pin and care should be taken to reduce the impedance in the layout.
Input Capacitor
To prevent the input voltage from dropping during load steps it is recommended to utilize an input capacitor (CIN). A minimum 0.47μF ceramic
capacitor is recommended between VIN and GND pins to decouple input power supply glitch. This input capacitor must be located as close as
possible to the device to assure input stability and reduce noise. For PCB layout, a wide copper trace is required for both VIN and GND pins.
Enable Control
The AP7340 is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to VIN pin
to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and
below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section.
Short Circuit Protection
When VOUT pin is short-circuit to GND, short circuit protection will be triggered and clamp the output current to approximately 60mA. This feature
protects the regulator from over-current and damage due to overheating.
Layout Considerations
For good ground loop and stability, the input and output capacitors should be located close to the input, output, and ground pins of the device. The
regulator ground pin should be connected to the external circuit ground to reduce voltage drop caused by trace impedance. Ground plane is
generally used to reduce trace impedance. Wide trace should be used for large current paths from VIN to VOUT, and load circuit.
ESR vs. Output Current
Ceramic type output capacitor is recommended for this series; however, the other output capacitors with low ESR also can be used. The relations
between IOUT (Output Current) and ESR of an output capacitor are shown below. The stable region is marked as the hatched area in the graph.
Measurement conditions:
Frequency Band : 10Hz to 2MHz, Temperature : -40°C to +85°C
AP7340
Document number: DS35282 Rev. 2 - 2
11 of 15
www.diodes.com
October 2013
© Diodes Incorporated
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AP7340.PDF ] | |
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