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LD2985BM18R 데이터시트 PDF




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부품번호 LD2985BM18R 기능
기능 Very low drop and low noise voltage regulator
제조업체 STMicroelectronics
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LD2985BM18R 데이터시트, 핀배열, 회로
LD2985
Very low drop and low noise voltage regulator with inhibit function
SOT23-5L
Features
Very low dropout voltage (280 mV at 150 mA
and 7 mV at 1 mA load)
Very low quiescent current (2 mA typ. at 150
mA load and 80 µA at no load)
Output current up to 150 mA
Logic controlled electronic shutdown
Output voltage of 1.8, 2.5, 2.8, 3, 3.1, 3.3, 5 V
Internal current and thermal limit
Low output noise voltage 30 mVrms
Small package SOT23-5L
Temperature range: - 40°C to 125 °C
Description
The LD2985 is a 150 mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise, low power applications, and in
battery powered systems. In sleep mode
quiescent current is less than 1 µA when INHIBIT
pin is pulled low. Shutdown logic control function
is available on pin 3 (TTL compatible). This
means that when the device is used as local
regulator, it is possible to put a part of the board in
standby, decreasing the total power consumption.
An external capacitor, CBYP = 10 nF, connected
between bypass pin and GND reduces the noise
Datasheet - production data
to 30 µVrms. Typical application are in cellular
phone, palmtop laptop computer, personal digital
assistant (PDA), personal stereo, camcorder and
camera.
Table 1. Device summary
Order codes
Output voltages
LD2985BM18R
1.8 V
LD2985BM25R
LD2985BM28R
2.5 V
2.8 V
LD2985BM30R
3.0 V
LD2985BM31R
3.1 V
LD2985BM33R
3.3 V
LD2985BM50R
5.0 V
November 2013
This is information on a product in full production.
DocID8189 Rev 13
1/18
www.st.com
18




LD2985BM18R pdf, 반도체, 판매, 대치품
Pin configuration
2 Pin configuration
Figure 2. Pin connections (top view)
54
LD2985
123
SC12360
Pin n°
1
2
3
4
5
Table 2. Pin description
Symbol
Name and function
IN Input port
GND Ground pin
INHIBIT
Bypass
Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left
floating. Disable the device when connected to GND or to a positive
voltage less than 0.18 V
Bypass pin: capacitor to be connected to GND in order to improve the
thermal noise performances
OUT Output port
Symbol
RthJC
RthJA
Table 3. Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
81
255
Unit
°C/W
°C/W
4/18 DocID8189 Rev 13

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LD2985BM18R 전자부품, 판매, 대치품
LD2985
Electrical characteristics
Symbol
Table 5. Electrical characteristics (continued)
Parameter
Test conditions
Min. Typ. Max.
VO Output voltage
VO Output voltage
VO Output voltage
VO Output voltage
VO Output voltage
VO Output voltage
ISC Short circuit current
ΔVO/ΔVI Line regulation
VDROP Dropout voltage
VI = 4.5 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
VI = 4.6 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
VI = 4.8 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
VI = 5.0 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
VI = 5.7 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
VI = 6.0 V
IO = 1 to 150 mA
IO = 1 to 150 mA, TJ= -40 to 125 °C
RL = 0
VI = VO + 1 V to 16 V, IO = 1 mA
VI = VO + 1 V to 16 V, IO = 1 mA,
TJ= -40 to 125 °C
IO = 0
IO = 0, TJ= -40 to 125 °C
IO = 1 mA
IO = 1 mA, TJ= -40 to 125 °C
IO = 10 mA
IO = 10 mA, TJ= -40 to 125 °C
IO = 50 mA
IO = 50 mA, TJ= -40 to 125 °C
IO = 150 mA
IO = 150 mA, TJ= -40 to 125 °C
3.413
3.395
3.360
3.51
3.492
3.456
3.705
3.686
3.648
3.900
3.88
3.84
4.583
4.559
4.512
4.875
4.85
4.8
3.5
3.6
3.8
4
4.7
5
400
0.003
3.587
3.605
3.640
3.69
3.708
3.744
3.895
3.914
3.952
4.100
4.12
4.16
4.817
4.841
4.888
5.125
5.15
5.2
0.014
0.032
13
5
7 10
15
40 60
90
120 150
225
280 350
575
Unit
V
V
V
V
V
V
mA
%/VI
mV
DocID8189 Rev 13
7/18

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LD2985BM18R

Very low drop and low noise voltage regulator

STMicroelectronics
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