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B4600 датащи(PDF) 3 Page - List of Unclassifed Manufacturers

номер детали B4600
подробное описание детали  600 mA Low Dropout Voltage Regulators
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производитель  ETC [List of Unclassifed Manufacturers]
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B4600 датащи(HTML) 3 Page - List of Unclassifed Manufacturers

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Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B4600
PRODUCT DESCRIPTION
The B4600 is precision fixed output voltage regulator.
Unlike bipolar regulators, the B4600 supply current
does not increase with load current. In addition, Vout
remains stable and within regulator at very low load
currents (an important consideration in RTC and
CMOS RAM battery back-up application).
Figure 1 shows a typical application circuit. The
regulator is enabled any time the shutdown input is at
or above VIH. And shutdown (disabled) when SHDN is
at or below VIL. SHDN maybe controlled by a CMOS
logic gate, or I/O port of a micro controller. If the
SHDN input is not. Required, it should be connected
directly to the supply. While in shutdown, supply
current decreases to 0.05
µA (typical) and Vout falls to
zero volts.
Output Capacitor
A 1
µF (min) capacitor from Vout to ground is required.
Then output capacitor should have an effective series
resistance of 5
Ω or less. A 1µA capacitor should be
connected from Vin to GND if there is more than 10
inches of wire between the regulator and the AC filter
capacitor, or if a battery is used as the power source.
Aluminum electrolytic or tantalum capacitor types can
be used. (since many aluminum electrolytic capacitors
freeze at approximately- 30
°C, solid tantalums are
recommended for applications operating below –25
°C.) When operating from sources other than
batteries, supply-noise rejection and transient response
can be improved by increasing the value of the input
and output capacitors and employing passive filtering
techniques.
Thermal Considerations
Thermal Shutdown
Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160
°C.
The regulator remaining off until the die temperature
drops to approximately 140
°C.
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case power dissipation:
PD=(VINMAX-VOUTMIN)ILOADMAX
Where:
PD= worst case actual power dissipation
VINMAX= Maximum voltage on VIN
VOUTMIN=Minimum regulator output voltage
ILOADMAX= maximum output (LOAD) Current
The maximum allowable power dissipation is function
of the maximum ambient temperature (TAMAX). The
maximum allowable die temperature (125
°C) and the
thermal resistance from junction-to-air (
θJA).
PDMAX=(TJMAX-TAMAX)/ θJA
Where all terms are previously defined
This can be caused in conjunction with other equation
to ensure regulator thermal operation is within limit.
For example:
Given:
VINMAX=3.3V+10%
VOUTMIN=2.7V-2.5%
ILOADMAX=275 mA
TJMAX=125°C
TAMAX=95°C
θJA= 59°C/W
Find:
1. Actual power dissipation
2. Maximum allowable dissipation
BATTREY
C1
1µF
VIN
GND
VOUT
C2
1µF
BATTREY
C1
1µF
VIN
GND
VOUT
C2
1µF
B4500
BATTREY
C1
1µF
VIN
GND
VOUT
C2
1µF
BATTREY
C1
1µF
VIN
GND
VOUT
C2
1µF
B4500


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