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參數(shù)資料
| 型號： | 52F2278 |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | 集成電路釤3.3V的電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 215K |
| 代理商： | 52F2278 |
MC33269
http://onsemi.com
6
APPLICATIONS INFORMATION
Figures 10 through 14 are typical application circuits. The
output current capability of the regulator is in excess of
800 mA, with a typical dropout voltage of less than 1.0 V.
Internal protective features include current and thermal
limiting.
The MC33269 is not internally compensated and thus
requires an external output capacitor for stability. The
capacitor should be at least 10
μ
F with an equivalent series
resistance (ESR) of less than 10
over the anticipated
operating temperature range. With economical electrolytic
capacitors, cold temperature operation can pose a problem.
As temperature decreases, the capacitance also decreases
and the ESR increases, which could cause the circuit to
oscillate. Solid tantalum capacitors may be a better choice
if small size is a requirement. Also capacitance and ESR of
a solid tantalum capacitor is more stable over temperature.
An input bypass capacitor is recommended to improve
transient response or if the regulator is connected to the
supply input filter with long wire lengths. This will reduce
the circuit’s sensitivity to the input line impedance at high
frequencies. A 0.33
μ
F or larger tantalum, mylar, ceramic,
or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with shortest possible lead or track length
directly across the regulator’s input terminals.
Applications
should be tested over all operating conditions to insure
stability.
Internal thermal limiting circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated, typically at
170
°
C, the output is disabled. There is no hysteresis built
into the thermal limiting circuit. As a result, if the device is
overheating, the output will appear to be oscillating. This
feature is provided to prevent catastrophic failures from
accidental device overheating.
It is not intended to be used
as a substitute for proper heatsinking.
Figure 10. Typical Fixed Output Application
MC33269–XX
Vin
Vout
Gnd
CO
10
μ
F
An input capacitor is not necessary for stability, however
it will improve the overall performance.
Figure 11. Typical Adjustable Output Application
MC33269
Vin
Vout
Adj
CO
10
μ
CAdj*
R1
R2
*CAdj is optional, however it will improve the ripple rejection.
The MC34269 develops a 1.25 V reference voltage between the
output and the adjust terminal. Resistor R1, operates with
constant current to flow through it and resistor R2. This current
should be set such that the Adjust Pin current causes negligible
drop across resistor R2. The total current with minimum load
should be greater than 8.0 mA.
Figure 12. Current Regulator
MC33269
Vin
Iout
Adj
RS
Iout
Figure 13. Battery Backed–Up Power Supply
MC33269–XX
Vin
Vout
MC33269–XX
Gnd
CO
10
μ
F
Figure 14. Digitally Controlled Voltage Regulator
MC33269
Vin
Vout
Adj
CO
10
μ
F
R1
R2
R2 sets the maximum output voltage. Each transistor
reduces the output voltage when turned on.
The Schottky diode in series with the ground leg of the upper
regulator shifts its output voltage higher by the forward
voltage drop of the diode. This will cause the lower device
to remain off until the input voltage is removed.
Vout
1.25
1
R2
R1
IAdjR2
1.25
RS
Cin
Cin
Cin
CO
10
μ
F
Cin
Cin
Gnd
Cin
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