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參數(shù)資料
| 型號(hào)： | MAX1735EUK25-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 200mA, Negative-Output, Low-Dropout Linear Regulator in SOT23 |
| 中文描述： | FIXED/ADJUSTABLE NEGATIVE LDO REGULATOR, 0.24 V DROPOUT, PDSO5 |
| 封裝： | MO-178AA, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大小： | 348K |
| 代理商： | MAX1735EUK25-T |
M
200mA, Negative-Output, Low-Dropout
Linear Regulator in SOT23
_______________________________________________________________________________________
7
In adjustable mode, an output voltage between -5.5V and
-1.25V is selected using two external resistors connected
as a voltage-divider from OUT to SET (Figure 3). The out-
put voltage is determined by the following equation:
where V
SET
= V
REFERENCE
= -1.25V when in regulation.
Since the input bias current at SET is <100nA, use
large resistance values for R1 and R2 to minimize
power consumption in the feedback network. A typical
value of 100k
for R2 is acceptable for most applica-
tions. Higher values consume less current at the
expense of output voltage accuracy. The above equa-
tion solved for R1 is:
For preset output voltage mode, connect SET directly
to GND.
Shutdown
In shutdown, the N-channel MOSFET, control circuitry,
reference, and all internal circuits are turned off, reduc-
ing supply current to typically 1nA.
SHDN
can be dri-
ven by either a positive or negative voltage. Drive
SHDN
above +1.6V or below -1.6V to turn the regulator
on. To turn the regulator off, drive
SHDN
to GND. For
always-on operation, connect
SHDN
to IN. By including
a positive threshold at
SHDN
, it can be driven by a
standard 5V TTL level without needing level-shifting cir-
cuitry.
Current Limiting
The MAX1735 features a current limit that protects the
regulator. Short-circuit output current is typically
515mA. The output will withstand a short to ground
indefinitely; however, if the increased power dissipation
heats the die to +160
°
C, the thermal overload protec-
tion will shut off the regulator, preventing damage to the
IC.
Thermal Overload Protection
The thermal overload protection circuit protects the reg-
ulator against overheating due to prolonged overload
conditions. When the die temperature exceeds +160
°
C,
an on-chip thermal sensor disables the pass transistor,
allowing the IC to cool. The thermal sensor reenables
the pass MOSFET once the die temperature drops
15
°
C. A continuous short-circuit fault condition results in
a cyclical enabling and disabling of the output.
Thermal overload protection is designed to safeguard
the MAX1735 in the event of overload fault conditions.
For normal operation, do not exceed the absolute maxi-
mum junction temperature rating of +150
°
C. Junction
temperature is greater than ambient by an amount
depending on package heat dissipation and the ther-
mal resistance from the junction to ambient (
θ
JA
):
T
JUNCTION
= T
AMBIENT
+ (
θ
JA
)(P
DISSIPATION
)
where
θ
JA
for the 5-pin SOT23 is about 0.140
°
C/mW.
R
R
V
V
OUT
SET
1
2
1
=
V
V
R
R
OUT
SET
=
+
1
1
2
MAX1735
SHDN
INPUT
C
IN
1
μ
F CERAMIC
ADJUSTABLE
OUTPUT
C
OUT
1
μ
F
CERAMIC
OUT
IN
SET
GND
ON
OFF
ON
-6.5V TO -2.5V
GND
-5.5V TO -1.25V
R2
R1
V
OUT
= V
SET
(
1 + R1
)
R2
Figure 3. Typical Application Circuit with Adjustable Output
Voltage
MAX1735
SHDN
INPUT
C
IN
1
μ
F CERAMIC
FIXED
OUTPUT
C
OUT
1
μ
F CERAMIC
OUT
IN
SET
GND
ON
OFF
ON
-6.5V TO -2.5V
GND
-5.0V,-3.0V, OR -2.5V
Figure 2. Typical Application Circuit with Preset Output Voltage
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1735EUK30 | 制造商:Maxim Integrated Products 功能描述:200MA, NEGATIVE OUTPUT, LOW-DROPOUT LINEAR RE - Cut Tape Product |
| MAX1735EUK30+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN ADJ/FIX NEG -1.25V TO -5.5V/-3V -0.2A 5PIN SOT-2 - Bulk |
| MAX1735EUK30+T | 功能描述:低壓差穩(wěn)壓器 - LDO 200mA Negative Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX1735EUK30-T | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX1735EUK50 | 制造商:Maxim Integrated Products 功能描述:200MA, NEGATIVE OUTPUT, LOW-DROPOUT LINEAR RE 5 PINS SOT PKG - Cut Tape Product |
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