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參數(shù)資料
| 型號： | 935269474115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.055 V DROPOUT, PDSO5 |
| 封裝： | PLASTIC, MO-178, SOT-25, SOT-23, SO-5 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 151K |
| 代理商： | 935269474115 |
Philips Semiconductors
Product data
SA57004-XX
Low-noise 150 mA linear CMOS regulator
2001 Dec 17
8
TECHNICAL DISCUSSION
As illustrated in Figure 17, the SA57004-XX consists of a band-gap
voltage reference, an error amplifier, P-channel pass transistor,
current limit circuit and an internal feedback voltage divider. The
output voltage is fed back through an internal resistor voltage divider
connected to the VOUT pin.
The reference is connected to the error amplifier’s inverting input.
The error amplifier compares the reference with the feedback
voltage and amplifies the difference. If the feedback voltage is lower
than the reference voltage, the pass transistor’s gate is pulled lower,
which allows more current to pass to the output and increase the
output voltage. On the other hand, if the feedback voltage is too high
the pass transistor gate is pulled up, allowing less current to pass to
the output, resulting a decrease in output voltage.
The current-limiter monitors and controls the pass-transistor’s gate
voltage, limiting the output current to its specified maximum value.
Thus it can withstand a short-circuited output for an indefinite
amount of time without damaging the part.
SL01442
1
5
GND
VIN
ON/OFF
VOUT
4
2
SA57004-XX
R
10 k
R
CURRENT
LIMIT
VREF
Figure 17. Functional diagram.
APPLICATION INFORMATION
SL01454
VIN
ON/OFF
VOUT
1
GND
2
5
4
SA57004-XX
CIN
0.01
F
(CERAMIC)
–0.3 V
to
+9.0 V
COUT
1.0
F
(ALUMINUM,
ELECTROLYTIC)
Figure 18. Typical application circuit.
The following points must be considered for good performance from
these devices:
Input capacitor: An input capacitor of
≥1 F is required between
the SA57004-XX input and the ground (the amount of capacitance
may be increased without limit).
This capacitor must be located as close as possible to VIN or GND
pin (not more than 1 cm) and returned to a clean analog ground.
Any good quality ceramic, tantalum or film capacitor will work.
Output capacitor: Phase compensation is made for securing stable
operation even if the load current varies. For this reason, an output
capacitor with good frequency characteristics is needed. Set it as
close to the circuit as possible and make the wiring as short as
possible.
The value of the output capacitance must be at least 1
F. Also it
must have the ESR (Equivalent Series Resistance) value within the
stable range shown in Figure 12, ‘ESR stable region’.
ON/OFF (Chip Enable) pin: The ON/OFF pin must be actively
terminated. If the function is not to be used, the pin should be tied to
VIN.
Line impedance of VDD and GND: The VIN and GND lines should
be sufficiently wide. Otherwise, when the impedance of these lines
is high, there is a chance to pick up noise or malfunction.
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