LD39100
1 A, low quiescent current, low-noise voltage regulator
Datasheet - production data
Applications
Printers
Game consoles
Computer
Consumer applications
Automotive post regulation
DFN6 (3x3 mm)
Features
AEC-Q100 qualified
Input voltage from 1.5 to 5.5 V
Ultra-low dropout voltage (200 mV typ. at
1 A load)
Very low quiescent current (20 µA typ. at no
load, 200 µA typ. at 1 A load, 1 µA max. in
off mode)
Very low-noise with no bypass capacitor
(30 µ V
RMS
at V
OUT
= 0.8 V)
Output voltage tolerance: ±2.0% at 25 °C
1 A guaranteed output current
Wide range of output voltages available on
request: 0.8 V to 4.5 V with 100 mV step and
adjustable from 0.8 V
Logic-controlled electronic shutdown
Stable with ceramic capacitors C
OUT
= 1 µF
Internal current and thermal limit
DFN6 (3x3 mm) package
Temperature range: -40 °C to 125 °C
Description
The LD39100 provides 1 A maximum current with
an input voltage range from 1.5 V to 5.5 V and a
typical dropout voltage of 200 mV. The device is
stable with ceramic capacitors on the input and
output. The ultra-low dropout voltage, low
quiescent current and low-noise features make it
suitable for low power battery-powered
applications. Power supply rejection is 70 dB at
low frequency and starts to roll off at 10 kHz.
Enable logic control function puts the LD39100 in
shutdown mode, allowing a total current
consumption lower than 1 µA. The device also
includes short-circuit constant current limiting and
thermal protection. LD39100 is available also in
AEC-Q100 qualified version, in the DFN6
(3x3 mm) with wettable flank package.
October 2017
DocID15676 Rev 7
1/29
www.st.com
This is information on a product in full production.
Contents
LD39100
Contents
1
2
3
4
5
6
Circuit schematics........................................................................... 5
Pin configuration ............................................................................. 6
Maximum ratings ............................................................................. 7
Electrical characteristics ................................................................ 8
Typical performance characteristics ........................................... 12
Application information ................................................................ 16
6.1
External capacitors.......................................................................... 17
6.1.1
6.1.2
Input capacitor .................................................................................. 17
Output capacitor ............................................................................... 17
6.2
6.3
6.4
Power dissipation ............................................................................ 17
Enable function ............................................................................... 18
Power Good function ....................................................................... 18
DFN6 (3x3 mm) package information ............................................. 21
DFN6 (3x3 mm) automotive-grade package information ................. 23
DFN6 (3x3 mm) packing information ............................................... 25
7
Package information ..................................................................... 20
7.1
7.2
7.3
8
9
Ordering information..................................................................... 27
Revision history ............................................................................ 28
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DocID15676 Rev 7
LD39100
List of tables
List of tables
Table 1: Pin description .............................................................................................................................. 6
Table 2: Absolute maximum ratings ........................................................................................................... 7
Table 3: Thermal data ................................................................................................................................. 7
Table 4: ESD performance ......................................................................................................................... 7
Table 5: LD39100 electrical characteristics (adjustable version) ............................................................... 8
Table 6: LD39100 electrical characteristics (fixed version) ...................................................................... 10
Table 7: DFN6 (3x3 mm) mechanical data ............................................................................................... 22
Table 8: DFN6 (3x3 mm) automotive-grade mechanical data .................................................................. 24
Table 9: DFN6 (3x3) tape and reel mechanical data ................................................................................ 26
Table 10: Order code ................................................................................................................................ 27
Table 11: Document revision history ........................................................................................................ 28
DocID15676 Rev 7
3/29
List of figures
LD39100
List of figures
Figure 1: LD39100 schematic diagram (adjustable version) ...................................................................... 5
Figure 2: LD39100 schematic diagram (fixed version) ............................................................................... 5
Figure 3: Pin connection (top view) ............................................................................................................ 6
Figure 4: V
ADJ
accuracy ............................................................................................................................ 12
Figure 5: V
OUT
accuracy ............................................................................................................................ 12
Figure 6: Dropout voltage vs. temperature (V
OUT
= 2.5 V) ........................................................................ 12
Figure 7: Dropout voltage vs. temperature (V
OUT
= 1.5 V) ........................................................................ 12
Figure 8: Dropout voltage vs. output current ............................................................................................ 12
Figure 9: Short-circuit current vs. drop voltage ......................................................................................... 12
Figure 10: Output voltage vs. input voltage (V
OUT
= 0.8 V) ....................................................................... 13
Figure 11: Output voltage vs. input voltage (V
OUT
= 2.5 V) ....................................................................... 13
Figure 12: Quiescent current vs. temperature .......................................................................................... 13
Figure 13: V
IN
input current in off mode vs. temperature .......................................................................... 13
Figure 14: Load regulation ........................................................................................................................ 13
Figure 15: Line regulation V
OUT
= 0.8 V .................................................................................................... 13
Figure 16: Line regulation V
OUT
= 2.5 V .................................................................................................... 13
Figure 17: Supply voltage rejection vs. temperature (V
OUT
= 0.8 V) ......................................................... 13
Figure 18: Supply voltage rejection vs. temperature (V
OUT
= 2.5 V) ......................................................... 14
Figure 19: Supply voltage rejection vs. frequency (V
OUT
= 0.8 V) ............................................................ 14
Figure 20: Supply voltage rejection vs. frequency (V
OUT
= 2.5 V) ............................................................ 14
Figure 21: Output noise voltage vs. frequency ......................................................................................... 14
Figure 22: Enable voltage vs. temperature ............................................................................................... 14
Figure 23: Load Transient (V
OUT
= 0.8 V, I
OUT
= from 10 mA to 1 A) ........................................................ 14
Figure 24: Load Transient (V
OUT
= 0.8 V, I
OUT
= from 100 mA to 1 A) ...................................................... 15
Figure 25: Load Transient (V
OUT
= 2.5 V, I
OUT
= from 10 mA to 1 A) ........................................................ 15
Figure 26: Load Transient (V
OUT
= 2.5 V, I
OUT
= from 100 mA to 1 A) ...................................................... 15
Figure 27: Line transient ........................................................................................................................... 15
Figure 28: Start-up transient ..................................................................................................................... 15
Figure 29: Enable transient ....................................................................................................................... 15
Figure 30: Typical application circuit for fixed output version ................................................................... 16
Figure 31: Typical application circuit for adjustable version ..................................................................... 16
Figure 32: Power dissipation vs. ambient temperature ............................................................................ 18
Figure 33: DFN6 (3x3 mm) package outline ............................................................................................. 21
Figure 34: DFN6 (3x3 mm) recommended footprint ................................................................................. 22
Figure 35: DFN6 (3x3 mm) automotive-grade package outline ............................................................... 23
Figure 36: DFN6 (3x3 mm) automotive-grade recommended footprint .................................................... 24
Figure 37: DFN6 (3x3) tape outline .......................................................................................................... 25
Figure 38: DFN6 (3x3 mm) reel outline .................................................................................................... 26
4/29
DocID15676 Rev 7
LD39100
Circuit schematics
1
Circuit schematics
Figure 1: LD39100 schematic diagram (adjustable version)
IN
Power-good
signal
IN
PG
BandGap
reference
OpAmp
Current
limit
Thermal
protection
OUT
ADJ
EN
Internal
enable
GND
GIPD010920151332MT
Figure 2: LD39100 schematic diagram (fixed version)
IN
Power-good
signal
IN
PG
BandGap
reference
OpAmp
Current
limit
Thermal
protection
R
1
NC
OUT
EN
Internal
enable
R
2
GND
GIPD010920151333MT
DocID15676 Rev 7
5/29
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