LD2980
Ultra low drop voltage regulators compatible
with low ESR output capacitors
Datasheet
-
production data
Description
The low drop voltage and the ultra low quiescent
current make them suitable for low noise, low
power applications and in battery powered
systems. The quiescent current in sleep mode is
less than 1
μA
when the INHIBIT pin is pulled low.
A shutdown logic control function is available on
pin n° 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. The LD2980 is
designed to work with low ESR ceramic
capacitors. Typical applications are cellular
phone, laptop computer, personal digital assistant
(PDA), personal stereo, camcorder and camera.
SOT23-5L
Features
•
Stable with low ESR ceramic capacitors
•
Ultra low dropout voltage (0.12 V typ. at 50 mA
load, 7 mV typ. at 1 mA load)
•
Very low quiescent current (80
μA
typ. at no
load in on mode; max 1
μA
in off mode)
•
Guaranteed output current up to 50 mA
•
Logic-controlled electronic shutdown
•
Output voltage of 1.8; 3.0; 3.3; 5.0 V
•
Internal current and thermal limit
•
± 0.5% Tolerance output voltage available (A
version)
•
Output low noise voltage 160
μVRMS
•
Temperature range: -40 to 125 °C
•
Smallest package SOT23-5L
•
Fast dynamic response to line and load
changes
Table 1. Device summary
Part numbers
AB version
C version
LD2980CM18TR
LD2980ABM30TR
LD2980ABM33TR
LD2980ABM50TR
November 2013
This is information on a product in full production.
Output voltage
1.8 V
3.0 V
LD2980CM33TR
LD2980CM50TR
DocID6280 Rev 18
3.3 V
5.0 V
1/22
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Contents
LD2980
Contents
1
2
3
4
5
6
7
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.1
7.2
7.3
7.4
7.5
7.6
External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
9
10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
DocID6280 Rev 18
Pin configuration
LD2980
2
Pin configuration
Figure 2. Pin connections (top view)
SOT23-5L
Table 2. Pin description
Pin n°
1
2
Symbol
V
IN
GND
Input port
Ground pin
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
Not connected
Output port
Name and function
3
INHIBIT
4
5
NC
V
OUT
Table 3. Thermal data
Symbol
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
81
255
Unit
°C/W
°C/W
4/22
DocID6280 Rev 18
LD2980
Maximum ratings
3
Maximum ratings
Table 4. Absolute maximum ratings
Symbol
V
I
V
INH
I
O
P
D
T
STG
T
OP
DC input voltage
INHIBIT input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Parameter
Value
-0.3 to 16
-0.3 to 16
Internally limited
Internally limited
-55 to 150
-40 to 125
°C
°C
Unit
V
V
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
DocID6280 Rev 18
5/22
22
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