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PDF AX6636A Data sheet ( Hoja de datos )
| Número de pieza | AX6636A | |
| Descripción | Dual 600mA LDO Regulator | |
| Fabricantes | AXElite | |
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AX6636A/B/C
Dual 600mA LDO Regulator with Enable
Function
GENERAL DESCRIPTION
The AX6636A/B/C is an efficient, precise dual-channel CMOS LDO regulator optimized
for ultra-low-quiescent applications. Regulators output1 and output2 are capable of sourcing
600mA of output current. The regulators are stable with output capacitors as low as 1μF,
including current limit, thermal shutdown protection, fast transient response, low dropout
voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. The
AX6636A/B/C contains internal pull high enable function that allows the output of each
regulator to be turned off independently. The AX6636A/B/C regulators are available in used
SOP-8L with Exposed Pad package.
FEATURES
- Input voltage range :
Channel1: 3.4V to 5.5V
Channel2: 2.8V to 5.5V
- Low Quiescent Current is 50uA/per channel (typ.)
- Fast transient response
- Tight Load and Line Regulation
- Current limit and thermal shutdown protection
- Support Ceramic Capacitors and Aluminum Electrolytic Capacitors for Stability
- Available in the SOP-8L with exposed pad Pb-Free Package
BLOCK DIAGRAM
VIN2
VIN1
VOUT2
Current
Limit2
Error
Amp
Thermal
Shutdown
Bandgap
Enable2 Enable1
Current
Limit1
Error
Amp
VOUT1
GND
EN2 EN1
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Jul.13, 2010
1 page  
AX6636A/B/C
Current Limit
Each channel of AX6636A/B/C includes a fold back current limiter. It monitors and
controls the pass transistor’s gate voltage, estimates the output current, and limits the output
current minimum 700mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of AX6636A/B/C. When the
junction temperature exceeds TJ = +150°C, a thermal sensor turns off the pass transistor,
allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the
junction temperature cools down by 25°C, resulting in a pulsed output during continuous
thermal shutdown conditions.
Thermal shutdown protection is designed to protect the AX6636A/B/C in the event of
fault conditions. For continuous operation, the absolute maximum operating junction
temperature rating of TJ = +125°C should not be exceeded.
APPLICATION INFORMATION
Like any low-dropout regulator, the AX6636A/B/C 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.
Input Capacitor
An input capacitance of 1μF is required between input pin and ground directly (the amount
of the capacitance may be increased without limit). The input capacitor must be located less
than 1cm from the device to assure input stability. A lower ESR capacitor allows the use of less
capacitance, while higher ESR type (like aluminum electrolytic) requires more capacitance.
Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total
equivalent input capacitance/ ESR must be defined as above to stable operation. There are no
requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must
be considered when selecting the capacitor to ensure the capacitance will be 1μF over the entire
operating temperature range.
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Jul.13, 2010
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX6636A.PDF ] | |
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