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PDF AP7343 Data sheet ( Hoja de datos )
| Número de pieza | AP7343 | |
| Descripción | 300mA HIGH PSRR LOW NOISE LDO | |
| Fabricantes | Diodes | |
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AP7343
300mA HIGH PSRR LOW NOISE LDO WITH ENABLE
Description
The AP7343 is a 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.
Pin Assignments
The AP7343 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 AP7343 is well suited for low power handheld communication
equipment.
The AP7343 is packaged in an X2-DFN1010-4 package and allows
for smallest footprint and dense PCB layout.
PIN1 – VOUT, PIN2 – GND, PIN3 – EN, PIN4 – VIN
Features
Low VIN and Wide VIN Range: 1.7V to 5.25V
Guarantee Output Current: 300mA
VOUT Accuracy ±1%
Ripple Rejection 75dB at 1kHz
Low Output Noise, 60µVrms from 10Hz to 100kHz
Quiescent Current as Low as 35µA
VOUT Fixed 0.9V to 3.6V
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Smart Phone/tablet
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
AP7343
Document number: DS37952 Rev. 2 - 2
Figure 1 Typical Application Circuit
1 of 16
www.diodes.com
December 2015
© Diodes Incorporated
1 page  
Typical Characteristics (continued)
40
35
30
25
20
15
10
5
0
0
Supply Current vs. Input Voltage
VOUT=1.8V
1234
Input Voltage V IN (V)
5
40
35
30
25
20
15
10
5
0
0
Supply Current vs. Input Voltage
VOUT=3.3V
1234
Input Voltage V IN (V)
5
2.840
Output Voltage Voltage vs Temperature
VOUT=2.8V
2.830
2.820
2.810
2.800
2.790
2.780
2.770
2.760
-50
-25
0 25 50
Temperature (℃)
75 100
AP7343
40
35
30
25
20
15
10
5
0
0
Supply Current vs. Input Voltage
VOUT=2.8V
1234
Input Voltage V IN (V)
5
Output Voltage Voltage vs Temperature
VOUT=1.8V
1.84
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.76
-50
-25
0 25 50
Temperature (℃)
75 100
3.340
Output Voltage Voltage vs Temperature
VOUT=3.3V
3.330
3.320
3.310
3.300
3.290
3.280
3.270
3.260
-50
-25
0 25 50
Temperature (℃)
75 100
AP7343
Document number: DS37952 Rev. 2 - 2
5 of 16
www.diodes.com
December 2015
© Diodes Incorporated
5 Page 
AP7343
Application Information
Output Capacitor
An output capacitor (COUT) is needed to improve transient response and maintain stability. The AP7343 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 AP7343 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 times. 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 overcurrent 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.
ESR vs. Output Current
100 AP7343-18
ESR vs. Output Current
100 AP7343-33
10 10
-40°C
-40°C
1
85°C 1
85°C
0.1 0.1
0.01 0.01
0.001
0
50 100 150 200 250 300
Output Current IOUT (mA)
0.001
0
50 100 150 200 250 300
Output Current IOUT (mA)
AP7343
Document number: DS37952 Rev. 2 - 2
11 of 16
www.diodes.com
December 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AP7343.PDF ] | |
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