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PDF AX6640 Data sheet ( Hoja de datos )
| Número de pieza | AX6640 | |
| Descripción | Low Noise CMOS Triple LDOs Regulator | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX6640
Low Noise CMOS Triple LDOs Regulator
GENERAL DESCRIPTION
The AX6640 is a three channel, high accurately, low quiescent current, low noise, low
dropout CMOS LDO regulator. The regulator performance is optimized for battery-powered
systems to deliver ultra low noise and low quiescent current. Regulator ground current
increases only slightly in dropout, further prolonging the battery life.
The AX6640 has the soft start function to suppress the inrush current. Built-in
current-limit and thermal shutdown functions prevent any fault condition from IC damage.
The AX6640 is fully compatible with low ESR ceramic capacitors, reducing cost and
improving output stability. This high level output stability is maintained even during frequent
load fluctuations, due to the excellent transient response performance and high PSRR
achieved across a broad range of frequency. It is available in the TSOT-23-6L package.
FEATURES
- Input voltage range: 3.0V to 5.5V
- Operating Output voltage type :
Channel 1 output voltage: 1.8V, 2.8V and 3.3V
Channel 2 output voltage: 2.8V and 3.3V
Channel 3 output voltage: 2.8V and 3.3V
- 100mV Dropout at 100mA output current (VOUT=3.3V)
- Output current is up to 150mA/each channel
- Low quiescent current 90µA(typ.)
- Fast transient response
- Current Limit protection
- Thermal shutdown protection
- Low ESR Capacitor Compatible
- Available in the 6-Pin Pb-Free TSOT-23 package
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.27, 2010
1 page  
AX6640
FUNCTION DESCRIPTIONS
The AX6640 is a highly accurate, Triple, low noise, CMOS LDO voltage regulators with
enable function. The output voltage for each regulator is set independently by fuse trimming.
As illustrated in function block diagram, it consists of a reference, error amplifier, a
P-channel pass transistor, an ON/OFF control logic and an internal feedback voltage divider.
The band gap reference is connected to the error amplifier, which compares the reference
with the feedback voltage and amplifies the voltage difference. If the feedback voltage is
lower than the reference voltage, the pass- transistor gate is pulled lower, which allows more
current to pass to the VOUT pin and increases the output voltage. If the feedback voltage is
too high, the pass transistor gate is pulled up to decrease the output voltage. The output
voltage is feed back through an internal resistive divider connected to VOUT pin. Additional
blocks include an output current limiter, thermal sensor, and shutdown logic.
Enable Function
EN pin control channel1 and channel2 enable and disable functions. When the EN pin
is switched to the power off level, the operation of partial internal circuit stops, the build-in
P-channel MOSFET output transistor between pins VIN and VOUT is switched off, allowing
current consumption to be drastically reduced. When channel1 is from disable to enable,
there is 60uS delay in power-ON or enable-ON.
Dropout Voltage
A regulator’s minimum input-output voltage differential, or dropout voltage, determines
the lowest usable supply voltage. The AX6640 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.
VDROPOUT = VIN - VOUT = RDS(ON) * IOUT
Current Limit
Each channel of AX6640 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
within minimum 170mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of AX6640. 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 30°C, resulting in a pulsed output during continuous
thermal shutdown conditions.
Thermal shutdown protection is designed to protect the AX6640 in the event of fault
conditions. For continuous operation, the absolute maximum operating junction temperature
rating of TJ = +125°C should not be exceeded.
5/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.27, 2010
5 Page 
PACKAGE OUTLINES
D
AX6640
θ
R
e
e1
b
C
L2
y
Symbol
Dimensions in Millimeters
Min. Nom.
Max.
A-
- 1.10
A1 0.00
-
0.10
A2 0.70
0.90
1.00
b 0.30 0.40 0.50
C 0.08 0.14
0.20
D 2.80 2.90
3.00
E 2.60 2.80
3.00
E1 1.50
1.60
1.70
e 0.95 BSC.
e1 1.90 BSC.
L 0.30 0.45 0.60
L1 0.60 REF.
L2 0.25 BSC.
y-
- 0.10
R 0.10
-
-
θ 0o
-
8o
JEDEC outline: MO-193 AA
Dimensions in Inches
Min. Nom. Max.
- - 0.043
0 - 0.004
0.028
0.035
0.039
0.012
0.016
0.020
0.003
0.006
0.008
0.110
0.114
0.118
0.102
0.110
0.118
0.059
0.063
0.067
0.037 BSC.
0.075 BSC.
0.012
0.018
0.024
0.024 REF.
0.010 BSC.
- - 0.004
0.004
-
-
0o - 8o
11/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.27, 2010
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AX6640.PDF ] | |
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