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參數(shù)資料
| 型號： | TK11900MTL |
| 廠商： | TOKO INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 1.5 V-15 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDSO6 |
| 封裝： | SOT-23L, SMT-6 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 73K |
| 代理商： | TK11900MTL |
Page 8
November 2000 TOKO, Inc.
TK11900
BOARD LAYOUT
Copper pattern should be as large as possible. Power
dissipation is 400 mW for the SOT-23L package. A low
Equivalent Series Resistance (ESR) capacitor is recom-
mended. For low temperature operation, select a capacitor
with a low ESR at the lowest operating temperature to
prevent oscillation, degradation of ripple rejection and in-
crease in noise. The minimum recommended capacitance
is 2.2 μF.
SOT-23L BOARD LAYOUT
INPUT/OUTPUT DECOUPLING CAPACITOR CONSID-
ERATIONS
Voltage regulators require input and output decoupling
capacitors. The required values of these capacitors vary
with application. Capacitors made by different manufactur-
ers can have different characteristics, particularly with
regard to high frequencies and ESR over temperature. The
type of capacitor is also important. For example, a 4.7 μF
aluminum electrolytic may be required for a certain applica-
tion. If a tantalum capacitor is used, a lower value of 2.2 μF
would be adequate. It is important to consider the tempera-
ture characteristics of the decoupling capacitors. While
Toko regulators are designed to operate as low as -30
°
C,
many capacitors will not operate properly at this tempera-
ture. The capacitance of aluminum electrolytic capacitors
may decrease to 0 at low temperatures. This may cause
oscillation on the output of the regulator since some capaci-
tance is required to guarantee stability. Thus, it is important
GND
VIN
VOUT
CONTROL
NOISE BYPASS
+
+
GND
FEEDBACK
to consider the characteristics of the capacitor over tem-
perature when selecting decoupling capacitors.
The ESR is another important parameter. The ESR will
increase with temperature but low ESR capacitors are often
larger and more costly. In general, tantalum capacitors offer
lower ESR than aluminum electrolytic, but new low ESR
aluminum electrolytic capacitors are now available from
several manufacturers. Usually a bench test is sufficient to
determine the minimum capacitance required for a particu-
lar application. After taking thermal characteristics and
tolerance into account, the minimum capacitance value
should capacitor or 3.3 μF for an aluminum electrolytic.
Please note that linear regulators with a low dropout voltage
have high internal loop gains which require care in guarding
against oscillation caused by insufficient decoupling ca-
pacitance. The use of high quality decoupling capacitors
suited for your application will guarantee proper operation of
the circuit.
NOISE BYPASS CAPACITOR SECTION
The noise bypass capacitor (C
N
) should be connected as
close as possible to pin 1 and ground. The recommended
value for C
N
is 0.01 mF. The noise bypass terminal has a
high impedance and care should be taken if the noise
bypass capacitor is not used. This terminal is susceptible
to external noise, and oscillation can occur when C
N
is not
used and the solder pad for this pin is too large.
OUTPUT VOLTAGE SETTING
The output voltage can be set from 1.5 to 15 V by two
external resistors according to the following equation:
V
OUT
= 1.25 V x [(R
1
+ R
2
) / R
2
]
where 10 k
- R
2
- 60 k
APPLICATION INFORMATION
VOUT
R2
R1
FEEDBACK
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