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PDF AX6630 Data sheet ( Hoja de datos )
| Número de pieza | AX6630 | |
| Descripción | 1.2A High Output Current LDO Regulator | |
| Fabricantes | AXElite | |
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AX6630/A
1.2A High Output Current LDO Regulator
GENERAL DESCRIPTION
The AX6630/A 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 1.2A. The
characteristics of low dropout voltage and less quiescent current make it good for some
critical current application, for example, some battery powered devices. The typical
quiescent current is approximately 50µA. Due to internal flexible design, result in
extensively fixed output voltage versions form 1.0V to 5V per 0.1V steps. 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
- Dropout voltage is 380mV at 1A output current
- Guaranteed 1.2A output current
- Low quiescent current is 50µA (typ.)
- Fixed Output voltage is form 1.0 V to 5V by 0.1V steps.
- Fast transient response
- Current limit and thermal shutdown protection
- Short circuit current fold-back
- Available in the 3-Pin Pb-Free SOT89, SOT-223, TO263 and TO252 packages
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.2 Jul.08, 2010
1 page  
AX6630/A
APPLICATION INFORMATION
Like any low-dropout regulator, the AX6630/A 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 (see Capacitor Characteristics Section). 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 AX6630/A. 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
Current Limit and Short-Circuit Protection
The AX6630/A used a current sense-resistor to monitor the output current. A portion of
the PMOS output transistor’s current is mirrored to a resistor such that the voltage across
this resistor is proportional to the output current. Once the output current exceeds limit
threshold, AX6630/A would be protected with a limited output current. Further more, when
the output is short to ground, the output current would be folded-back to a less limit.
Thermal Considerations
The AX6630/A series can deliver a current of up to 1.2A over the full operating junction
temperature range. However, the maximum output current must be dated at higher ambient
temperature to ensure the junction temperature does not exceed 125°C. With all possible
conditions, the junction temperature must be within the range specified under operating
conditions. Power dissipation can be calculated based on the output current and the voltage
drop across regulator.
PD = (VIN - VOUT) IOUT
The final operating junction temperature for any set of conditions can be estimated by
the following thermal equation:
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.2 Jul.08, 2010
5 Page 
(4) SOT89-3L
D1
AX6630/A
1.7
0.4
80(2x)
e1
e
D
0.9 1.5
Land Pattern Recommendation (Unit: mm)
50(2x)
b b1 b
C
Symbol
Dimensions in Millimeters
Min. Nom. Max.
A 1.40 1.50 1.60
b 0.36 0.42 0.48
b1 0.44 0.50
0.56
C 0.35 0.40
0.44
D 4.40 4.50
4.60
D1 1.35
1.59
1.83
e 3.0 BSC
e1 1.5 BSC
E 2.29 2.45 2.60
HE 3.94
4.10
4.25
L 0.80 1.00 1.20
JEDEC outline: TO-243 AB
Dimensions in Inches
Min. Nom. Max.
0.055
0.059
0.063
0.014
0.017
0.019
0.017 0.02 0.022
0.014
0.016
0.017
0.173
0.177
0.181
0.053
0.063
0.072
0.118 BSC
0.059 BSC
0.09 0.097 0.102
0.155
0.161
0.167
0.031 0.04 0.047
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.2 Jul.08, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX6630.PDF ] | |
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