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LP2985IM5-3.3 Datasheet(PDF) 23 Page - Texas Instruments

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Part # LP2985IM5-3.3
Description  LP2985-N 150-mA, Low-Noise, Low-Power, Ultra-Low-Dropout Regulator in a SOT-23 Package
PDF  43 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LP2985IM5-3.3 Datasheet(HTML) 23 Page - Texas Instruments

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The ESR of a typical tantalum increases by approximately 2:1 as the temperature goes from 25°C down to
–40°C, so some guard band must be allowed.
8.2.2.2 ON/OFF Input Operation
The LP2985-N is shut off by driving the ON/OFF input low, and turned on by pulling the ON/OFF input high. If
this feature is not used, the ON/OFF input must be tied to VIN to keep the regulator output on at all times.
To provide proper operation, the signal source used to drive the ON/OFF input must be able to swing above
and below the specified turn-on/turn-off voltage thresholds listed in the Electrical Characteristics section under
VON/OFF. For the legacy chip, to prevent misoperation, the turn-on (and turn-off) voltage signals applied to the
ON/OFF input must have a slew rate that is ≥ 40 mV/µs. But for the new chip, there is no restriction on the slew
rate of the voltage signals applied to the ON/OFF pin.
8.2.3 Application Curves
at operating temperature TJ = 25°C, VIN = VOUT(NOM) + 1.0 V or 2.5 V (whichever is greater), IOUT = 1 mA,
ON/OFF pin tied to VIN, CIN = 1.0 µF, and COUT = 4.7 µF (unless otherwise noted)
Figure 8-3. Short-Circuit Current for Legacy Chip
at VIN = 6 V
200
s/div
0
200
400
600
800
1000
-6
-600
-5
0
-4
600
-3
1200
-2
1800
-1
2400
0
3000
1
3600
2
4200
3
4800
4
5400
5
6000
VIN = 6 V
Cbyp = 10 nF
VO = 3.3 V
VO
I SC
VIN = 6 V
Figure 8-4. Short-Circuit Current for New Chip at
VIN = 6 V
Figure 8-5. Short-Circuit Current for Legacy Chip
at VIN = 16 V
200
s/div
0
200
400
600
800
1000
-6
-600
-5
0
-4
600
-3
1200
-2
1800
-1
2400
0
3000
1
3600
2
4200
3
4800
4
5400
5
6000
VIN = 16 V
Cbyp = 10 nF
VO = 3.3 V
VO
I SC
Figure 8-6. Short-Circuit Current for New Chip at
VIN = 16 V
www.ti.com
LP2985-N
SNVS018Z – MARCH 2000 – REVISED MAY 2023
Copyright © 2023 Texas Instruments Incorporated
Submit Document Feedback
23
Product Folder Links: LP2985-N



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