LD3985XX26 STMicroelectronics, LD3985XX26 Datasheet

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LD3985XX26

Manufacturer Part Number
LD3985XX26
Description
ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATOR LOW ESR CAPACITOR COMPATIBLE
Manufacturer
STMicroelectronics
Datasheet

Specifications of LD3985XX26

Wide Range Of Output Voltage
1.22 V; 1.8 V; 2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V
Fast Turn-on Time
typ. 200µs
Temperature Range
-40°C to 125 °C
Features
Description
The LD3985xx provides up to 150 mA, from 2.5 V
to 6 V input voltage. The ultra low drop-voltage,
low quiescent current and low noise make it
suitable for low power applications and in battery
powered systems. Regulator ground current
increases only slightly in dropout, further
prolonging the battery life. Power supply rejection
is better than 60 dB at low frequencies and starts
Table 1.
January 2011
Input voltage from 2.5 V to 6 V
Stable with low ESR ceramic capacitors
Ultra low dropout voltage (60 mV typ. at 150
mA load, 0.4 mV typ. at 1 mA load)
Very low quiescent current (85 µA typ. at no
load, 170 µA typ. at 150 mA load; max 1.5 µA
in OFF mode)
Guaranteed output current up to 150 mA
Wide range of output voltage: 1.22 V; 1.8 V; 2.5
V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V
Fast turn-on time: typ. 200 µs [C
= 10 nF and I
Logic-controlled electronic shutdown
Internal current and thermal limit
Output low noise voltage 30 µV
to 100 kHz
SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
Temperature range: - 40 °C to 125 °C
Device summary
O
= 1 mA]
LD3985XX122
LD3985XX18
LD3985XX25
LD3985XX26
LD3985XX27
RMS
O
= 1 µF, C
over 10 Hz
regulators low ESR capacitors compatible
Ultra low drop-low noise BiCMOS voltage
Doc ID 9587 Rev 14
Part numbers
BYP
to roll off at 10 kHz. High power supply rejection is
maintained down to low input voltage levels
common to battery operated circuits. Shutdown
logic control function is available, 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
LD3985xx is designed to work with low ESR
ceramic capacitors. Typical applications are in
mobile phone and similar battery powered
wireless systems.
(1.57 x 1.22)
Flip-chip
LD3985XX28
LD3985XX29
LD3985XX30
LD3985XX33
LD3985XX47
SOT23-5L
LD3985xx
TSOT23-5L
www.st.com
1/23
23

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LD3985XX26 Summary of contents

Page 1

... Power supply rejection is better than low frequencies and starts Table 1. Device summary LD3985XX122 LD3985XX18 LD3985XX25 LD3985XX26 LD3985XX27 January 2011 Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible Flip-chip (1.57 x 1.22) to roll off at 10 kHz. High power supply rejection µ ...

Page 2

Contents Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

LD3985xx 1 Diagram Figure 1. Schematic diagram Doc ID 9587 Rev 14 Diagram 3/23 ...

Page 4

Pin configuration 2 Pin configuration Figure 2. Pin connections (top view for SOT and TSOT, top through view for Flip-chip) SOT23-5L/TSOT23-5L Table 2. Pin description Pin n° for Pin n° for SOT23-5L/ Symbol Flip-chip TSOT23- ...

Page 5

LD3985xx 3 Typical application Figure 3. Typical application circuit Doc ID 9587 Rev 14 Typical application 5/23 ...

Page 6

Maximum ratings 4 Maximum ratings Table 3. Absolute maximum ratings Symbol V DC input voltage output voltage O V INHIBIT input voltage INH I Output current O P Power dissipation D T Storage temperature range STG T ...

Page 7

LD3985xx 5 Electrical characteristics ° otherwise specified. Table 5. Electrical characteristics for LD3985 Symbol Parameter V Operating input voltage I V Output voltage < 2 Output voltage ≥ 2.5 V ...

Page 8

Electrical characteristics Table 5. Electrical characteristics for LD3985 (continued) Symbol Parameter SVR Supply voltage rejection I Peak output current O(PK) Inhibit input logic low V INH Inhibit input logic high I Inhibit input current INH eN Output noise voltage (4) ...

Page 9

LD3985xx 6 Typical performance characteristics ° unless otherwise specified. Figure 4. Output voltage vs. temperature Figure 6. Output voltage vs. temperature Figure 8. Shutdown voltage vs. temperature +0 ...

Page 10

Typical performance characteristics Figure 10. Line regulation vs. temperature Figure 12. Load regulation vs. temperature Figure 14. Load regulation vs. temperature 10/23 Figure 11. Line regulation vs. temperature Figure 13. Load regulation vs. temperature Figure 15. Quiescent current vs. temperature ...

Page 11

LD3985xx Figure 16. Quiescent current vs. temperature Figure 18. Supply voltage rejection vs. frequency Figure 20. Line transient response V = 3.8V to 4.4V 25° 150mA (X7R 10nF, Rise-Fall time ...

Page 12

Typical performance characteristics Figure 22. Turn-Off V = 3.3V 1mA 1mF (cer 20ns 2. 12/23 = 10nF, BYP Doc ID 9587 Rev 14 ...

Page 13

LD3985xx 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ...

Page 14

Package mechanical data Dim. Min. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2. 2.60 L 0.10 14/23 SOT23-5L mechanical data mm. Typ. Max. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 0.95 3.00 ...

Page 15

LD3985xx Dim. Min 0.7 b 0 0.3 TSOT23-5L mechanical data mm. Typ. Max. 1.1 0.1 1.0 0.5 0.2 2.9 2.8 1.6 0.95 1.9 0.6 Doc ID 9587 Rev ...

Page 16

Package mechanical data Table 6. Flip-chip 5 mechanical data Dim ccc $ 16/23 mm. Min. Typ. 0.54 0.65 0.21 0.25 0.33 0.35 0.265 0.315 1.54 1.59 0.83 0.87 ...

Page 17

LD3985xx Figure 23. Drawing dimension Flip-chip 5 Doc ID 9587 Rev 14 Package mechanical data 7224716/N 17/23 ...

Page 18

Package mechanical data Tape & reel SOT23-xL mechanical data Dim. Min 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 18/23 mm. Typ. Max. Min. 180 13.0 13.2 0.504 0.795 2.362 ...

Page 19

LD3985xx Tape & reel Flip-chip 5 mechanical data Dim. Min 12 1.60 Bo 1.27 Ko 0.76 Po 3.9 P 3.9 mm. Typ. Max. Min. 178 13.2 0.504 0.795 50 51 1.929 12.4 ...

Page 20

Package mechanical data Tape & reel TSOT23-5L mechanical data Dim. Min 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 20/23 mm. Typ. Max. Min. 180 13.0 13.2 0.504 0.795 2.362 ...

Page 21

LD3985xx 8 Order codes Table 7. Order codes SOT23-5L LD3985M122R LD3985M18R LD3985M25R (1) LD3985M26R LD3985M27R LD3985M28R LD3985M29R LD3985M30R LD3985M33R LD3985M47R 1. Available on request. Packages TSOT23-5L (1) LD3985G122R LD3985G18R LD3985J18R LD3985G25R LD3985J25R (1) LD3985G26R LD3985J26R LD3985G27R LD3985G28R LD3985J28R LD3985J29R LD3985G30R ...

Page 22

Revision history 9 Revision history Table 8. Document revision history Date Revision 07-May-2004 6 05-Oct-2004 7 27-Oct-2004 8 17-Mar-2005 9 10-Apr-2007 10 08-Jun-2007 11 20-Dec-2007 12 02-Dec-2008 13 03-Jan-2011 14 22/23 Part number status changed on table 3. t values ...

Page 23

... LD3985xx Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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