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PDF AX6643 Data sheet ( Hoja de datos )
| Número de pieza | AX6643 | |
| Descripción | 1.5A High Output Current LDO Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6643
1.5A High Output Current LDO Regulator
GENERAL DESCRIPTION
The AX6643 is a low noise, high output current, low quiescent current and low dropout
linear regulator. The Device includes pass element, error amplifier, band-gap, current limit
and thermal shutdown circuitry. The output current is up to 1.5A, the characteristics of low
dropout voltage and less quiescent current make it good for some critical current application,
and for example, some battery powered devices. The typical quiescent current is
approximately 50µA. In the shutdown mode, the maximum supply current is less than 2uA.
Built-in current-limit, Short current protection and thermal-shutdown functions prevent any
fault condition from IC damage.
FEATURES
- Input voltage range : 2.6V~5.5V
- Adjustable Output voltage form 0.8V to 5.0V
- Dropout voltage is 450mV at 1.5A output current @ VOUT = 3.30V
- Guaranteed 1.5A output current
- Low quiescent current is 50µA (typ.)
- Maximum supply current in shutdown mode < 2uA
- Fast transient response
- Current limit and thermal shutdown protection
- Short circuit current fold-back
- Available in the SOP-8L, TO252-5L and TDFN-6L Pb-Free Packages
BLOCK DIAGRAM
VIN VOUT
Current
Limit
EN Enable
Thermal
Shutdown
Error
Amp
-+
Bandgap
FB
GND
BP
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.30, 2010
1 page  
AX6643
Enable Function
The AX6643 features an LDO regulator enable/disable function. To assure the LDO
regulator will switch on; the EN turn on control level must be greater than 2.0 volts. The LDO
regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.6
volts. For to protecting the system, the AX6643 have a quick-discharge function. If the
enable function is not needed in a specific application, it may be tied to VIN to keep the LDO
regulator in a continuously on state.
FB Function
The output is an adjustable version, the FB voltage is 0.8V. The output voltage can be
set by outside resistances. The output voltage, VOUT, is then given by the following equation:
VOUT = 0.8* (1 + R1/R2)
For the reasons of reducing power dissipation and loop stability, R2 is recommending
to choose 50K~300KΩ.
APPLICATION INFORMATION
Like any low-dropout regulator, the AX6643 requires input and output decoupling
capacitors. The device is specifically designed for portable applications requiring minimum
board space and smallest components. These capacitors must be correctly selected for
good performance. Please note that linear regulators with a low dropout voltage have high
internal loop gains which require care in guarding against oscillation caused by insufficient
decoupling capacitance.
Capacitor Selection
Normally, use a 2.2µF capacitor on the input and a 2.2µF capacitor on the output of
the AX6643. Larger input capacitor values and lower ESR (X5R, X7R) provide better
supply-noise rejection and transient response. A higher- value output capacitor (4.7µF) may
be necessary if large, fast transients are anticipated and the device is located several inches
from the power source.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines
the lowest usable supply voltage. In battery-powered systems, this determines the useful
end-of-life battery voltage. Because the device uses a PMOS, its dropout voltage is a
function of drain-to source on-resistance, RDS (ON), multiplied by the load current:
VDROPOUT = VIN -VOUT = RDS (ON) x IOUT
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.30, 2010
5 Page 
(3) TDFN-6L (2*2 0.75mm)
D
E
(Top View)
AX6643
D2
E2
be
(Bottom View)
L
Pin 1
A
A3
SEATING PLANE
(SIDE View)
Symbol
A
A1
A3
b
D
D2
E
E2
e
L
Dimensions in Millimeters
Min. Nom. Max.
0.70 0.75 0.80
0.00 0.02 0.05
0.203 REF.
0.20 0.28 0.35
1.95 2.00 2.05
1.35 1.50 1.65
1.95 2.00 2.05
0.75 0.90 1.05
0.65 BSC.
0.20 0.30 0.40
Dimensions in Inches
Min. Nom. Max.
0.028
0.030
0.031
0.000
0.001
0.002
0.008 REF.
0.009
0.011
0.013
0.077
0.079
0.081
0.055
0.059
0.063
0.077
0.079
0.081
0.031
0.035
0.039
0.026 BSC.
0.008
0.012
0.016
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.30, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX6643.PDF ] | |
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