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PDF AX6644 Data sheet ( Hoja de datos )
| Número de pieza | AX6644 | |
| Descripción | Dual Channel LDO Regulators | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX6644 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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AX6644/5
Dual Channel LDO Regulators with Enable
GENERAL DESCRIPTION
The AX6644/5 is a high accurately, low noise, high ripple rejection ratio, low dropout,
dual CMOS LDO voltage regulators with enable function. The EN function allows the output
of each regulator to be turned off independently, resulting in greatly reduced power
consumption.
The AX6644/5 has the soft start function to suppress the inrush current. The current
limit is over 250mA per channel and also operates as a short protection for the output
current limiter. The output voltage for each regulator is set independently by internal setting.
The AX6644/5 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 and TDFN-6L
packages.
FEATURES
- Input voltage range :2.5V to 6V
- Varied fixed output voltage combinations
- 200mV Dropout at 200mA output current (VOUT≧2.5V)
- Output current: 200mA/channel (typ.)
- Low quiescent current: 60μA (typ.)
- Current Limit and Short current protections
- Thermal shutdown protection
- Fast transient response
- Low ESR Capacitor Compatible (X7R, X5R)
- Available in the 6-Pin Pb-Free TSOT-23 and TDFN-6L packages
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Jun.28, 2011
1 page  
AX6644/5
ELECTRICAL CHARACTERISTICS (CONTINUOUS)
Load Regulation (Note 2)
ΔVLOAD
IOUT = 1~100mA,
VIN = VOUT+1V
- 0.01 0.03 %/mA
Ripple Rejection
PSRR F = 120Hz, ,IOUT = 30mA - 60 - dB
Output Voltage
Temperature Coefficient
IOUT = 1mA (Note 3)
- ±100 - PPM/°C
Enable Input Threshold
VENH
VENL
2.0 - -
- - 0.6
V
Enable pull-high current
(each channel)
Shutdown Current
Thermal Shutdown
Temperature
IEN1,2 VEN1,2 = 0V
ISD
IOUT1,2 = 0mA,
VIN = 5V, VEN1,2 = 0V
TST
- 12
- 24
- 150 -
μA
μA
°C
Thermal Shutdown Hysterisis TSH
- 40 - °C
Note 1: Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.
Note 2: Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.
Note 3: Guaranteed by design.
APPLICATION CIRCUIT
VIN C IN
VOUT2
2.2uF
EN2 VIN EN1
VOUT2
VOUT1
COUT2
GND
AX6644/5
2.2uF
V OUT1
COUT1
2.2uF
FUNCTION DESCRIPTIONS
The AX6644/5 is a highly accurate, dual, 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.
5/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Jun.28, 2011
5 Page 
AX6644/5
TYPICAL CHARACTERISTICS (CONTINUOUS)
Load Transient
Load Transient
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.5 Jun.28, 2011
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX6644.PDF ] | |
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