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PDF AX6637 Data sheet ( Hoja de datos )
| Número de pieza | AX6637 | |
| Descripción | Dual Low Dropout Linear Regulators | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6637
Dual Low Dropout Linear Regulators
GENERAL DESCRIPTION
The AX6637A/B/C/D is an efficient, precise dual-channel CMOS LDO regulator
optimized for ultra-low-quiescent applications. Regulators output1 is capable of sourcing
900mA of output current and output2 is capable of sourcing 800mA 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 AX6637A/B/C/D regulators are
available in used SOP-8L and TO252-5L Pb-Free Packages.
FEATURES
- Input voltage range :
Channel1: 3.4V to 5.5V
Channel2: 2.8V to 5.5V
- Low Quiescent Current is 50uA (typ.)/per channel
- Fast transient response
- Tight Load and Line Regulation
- Current limit and thermal shutdown protection
- Only low-ESR Ceramic Capacitors Required for Stability
- Available in the SOP-8L and TO252-5L Pb-Free Packages
BLOCK DIAGRAM
VIN2
VIN1
VOUT2
Current
Limit2
Error
Amp
Thermal
Shutdown
Bandgap
Enable2 Enable1
Current
Limit1
Error
Amp
VOUT1
GND
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.14, 2010
1 page  
AX6637
Dropout Voltage
A regulator’s minimum input-output voltage differential, or dropout voltage, determines
the lowest usable supply voltage. The AX6637A/B/C/D use a P- channel MOSFET pass
transistor, its dropout voltage is function of drain-to-source on-resistance RDS (ON) multiplied
by the load current.
VD R O P O=UVTIN - VOUT = RDS(ON) * IOUT
Current Limit
Each channel of AX6637A/B/C/D includes a fold back current limiter. It monitors and
controls the pass transistor’s gate voltage, estimates the output current, and limits the
output1 current minimum 900mA, output2 current minimum 800mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of AX6637A/B/C/D. 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 40°C, resulting in a pulsed output during continuous
thermal shutdown conditions.
Thermal shutdown protection is designed to protect the AX6637A/B/C/D 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 AX6637A/B/C/D 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.
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.14, 2010
5 Page 
(2) SOP-8L
AX6637
b
D
7 (4X)
L
DETAIL A
θ
e
y
Symbol
Dimensions in Millimeters
Min. Nom. Max.
A-
- 1.75
A1 0.1 - 0.25
A2 1.25
-
-
C 0.1 0.2 0.25
D 4.7
4.9
5.1
E 3.7
3.9
4.1
H 5.8
6
6.2
L 0.4 - 1.27
b 0.31 0.41
0.51
e 1.27 BSC
y-
- 0.1
θ 0O
-
8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 AA
DETAIL A
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0.04 - 0.1
0.049
-
-
0.0075 0.008 0.01
0.185
0.193
0.2
0.146
0.154 0.161
0.228
0.236 0.244
0.015 - 0.05
0.012
0.016
0.02
0.050 BSC
- - 0.004
0O - 8O
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.14, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX6637.PDF ] | |
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