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參數(shù)資料
| 型號： | MAX1735EUK25-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 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 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 348K |
| 代理商： | MAX1735EUK25-T |
M
200mA, Negative-Output, Low-Dropout
Linear Regulator in SOT23
Detailed Description
The MAX1735 is a low-dropout negative linear voltage
regulator. It features Dual Mode operation, allowing a
fixed -5.0V, -3.0V, or -2.5V output voltage or an
adjustable output from -1.25V to -5.5V. The regulator is
guaranteed to supply 200mA of output current. It fea-
tures 60dB power-supply rejection for noise-sensitive
applications and a low 85μA operating current that opti-
mizes it for battery-operated devices.
As Figure 1 illustrates, the device consists of an internal
-1.25V reference, an error amplifier, an N-channel
MOSFET, an internal precision-trimmed feedback volt-
age-divider, and a Dual Mode comparator.
The -1.25V reference is connected to the inverting input
of the error amplifier. The error amplifier compares the
reference voltage with the selected feedback voltage
and amplifies the difference. The error amplifier drives
the MOSFET to control the output voltage.
The feedback voltage for regulation is generated by
either an internal or external resistive voltage-divider
connected from OUT to SET. The internal Dual Mode
comparator selects the feedback path based on V
SET
.
Connect SET to GND to use the internal feedback path,
setting the output voltage to the preset value. If an
external voltage-divider is used, see
Output Voltage
Selection
.
Internal N-Channel MOSFET
The MAX1735 features an N-channel MOSFET pass
transistor. Unlike similar designs using NPN bipolar
pass transistors, N-channel MOSFETs require extreme-
ly low drive currents, reducing overall quiescent cur-
rent. Also, NPN-based regulators consume still more
base current in dropout conditions when the pass tran-
sistor saturates. The MAX1735 does not suffer from
these problems, consuming only 125μA total current at
full load and in dropout.
Output Voltage Selection
The MAX1735 features Dual Mode operation, allowing for
a preset or adjustable output voltage. In preset voltage
mode, the output of the MAX1735 is set to -5.0V, -3.0V, or
-2.5V (see
Ordering Information
). Select this mode by
connecting SET to GND (Figure 2).
ON
OFF
ON
THERMAL
SENSOR
NMOS
PASS
TRANSISTOR
OUT
C
OUT
R1
R2
SET
GND
Dual Mode
COMPARATOR
ERROR
AMPLIFIER
V
REF
-1.25V
-270mV
SHUTDOWN
LOGIC
SHDN
C
IN
IN
MAX1735
GND
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
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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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