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LP3985 -
Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator
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Features
| | Miniature 5-I/O micro SMD and SOT-23-5 package |
| | Logic controlled enable |
| | Stable with ceramic and high quality tantalum capacitors |
| | Fast turn-on |
| | Thermal shutdown and short-circuit current limit |
Key Specification
| | 2.5 to 6.0V input range |
| | 150mA guaranteed output |
| | 50dB PSRR at 1kHz @ VIN = VOUT + 0.2V |
| | <=1.5µA quiescent current when shut down |
| | Fast Turn-On time: 200 µs (typ.) |
| | 100mV maximum dropout with 150mA load |
| | 30µVrms output noise (typ) over 10Hz to 100kHz |
| | -40 to +125°C junction temperature range for operation |
| | 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 4.7V, 4.75V, 4.8V and 5.0V outputs standard |
General Description
The LP3985 is designed for portable and wireless applications with demanding performance and space requirements.
The LP3985 is stable with a small 1µF ±30% ceramic or high-quality tantalum output capacitor. More...
Applications
| | CDMA cellular handsets |
| | Wideband CDMA cellular handsets |
| | GSM cellular handsets |
| | Portable information appliances |
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Typical Application
click for larger image
| Parameters | Values |
| Output Current |
150 mA |
| Output Min |
2.6, 4.7, 2.7, 2.5, 3.2, 3.3, 3, 2.8, 2.9, 3.1, 5 Volt |
| Input Min Voltage |
2.5 Volt |
| Input Max Voltage |
6 Volt |
| Dropout Voltage |
0.06 Volt |
| Adjustable Output |
No |
| Quiescent Current |
0.085 mA |
| PSRR |
50 dB |
| Voltage Noise (rms) |
30 uV |
| On/Off Pin |
Yes |
| Error Flag |
No |
| RegType |
LDO |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Output Voltage |
2.6, 4.7, 2.7, 2.5, 3.2, 3.3, 3, 2.8, 2.9, 3.1, 5 Volt |
| Output Max |
2.6, 4.7, 2.7, 2.5, 3.2, 3.3, 3, 2.8, 2.9, 3.1, 5 Volt |
Typical Performance
click for larger image
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Also Recommended
| LP3986 | Dual 150mA Output Version |
| LP3987▲ | LP3985 W/ Sleep Mode |
| LP3988▲ | LP3985 W/ Power Good Flag |
| LP3995▲ | 25uV Noise, 60dB PSRR |
| LP3996 | Dual 150mA |
| LP5900▲ | Wide Selection Of Voltage Options, Supports Ceramic Capacitors |
| LP2983▲ | 0.9V, 1.0V And 1.2V Output Options |
| LP3981▲ | 300mA Version |
Additional Resources
Online Seminars
Application Notes

Block Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LP3985 Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator |
993 Kbytes |
23-Aug-05 |
Download |
LP3985 Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator (Japanese)
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854 Kbytes |
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Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LP3985IBL-285
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
|
LP3985IBL-2.5
| LP3985ITL-2.5
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-2.6
| LP3985ITL-2.6
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-2.7
| LP3985ITL-2.7
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-2.8
| LP3985ITL-2.8
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-2.9
| LP3985ITL-2.9
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-3.0
| LP3985ITL-3.0
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-3.1
| LP3985ITL-3.1
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-3.2
| LP3985ITL-3.2
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBL-3.3
| LP3985ITL-3.3
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-4.8
| LP3985ITL-4.8
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBL-5.0
| LP3985ITL-5.0
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LP3985IBLX-285
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
|
LP3985IBLX-2.5
| LP3985ITLX-2.5
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-2.6
| LP3985ITLX-2.6
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-2.7
| LP3985ITLX-2.7
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-2.8
| LP3985ITLX-2.8
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-2.9
| LP3985ITLX-2.9
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-3.0
| LP3985ITLX-3.0
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-3.1
| LP3985ITLX-3.1
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-3.2
| LP3985ITLX-3.2
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-3.3
| LP3985ITLX-3.3
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-4.8
| LP3985ITLX-4.8
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBLX-5.0
| LP3985ITLX-5.0
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBP-285
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
|
LP3985IBP-2.5
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
|
LP3985IBP-2.7
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBP-2.8
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
|
LP3985IBP-2.9
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBP-3.0
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBP-3.2
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBP-3.3
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
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LP3985IBP-5.0
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBPX-2.5
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBPX-2.7
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
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LP3985IBPX-2.8
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBPX-2.9
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBPX-3.0
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IBPX-3.1
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
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LP3985IBPX-3.3
| NONE
| NATIONAL SEMICONDUCTOR
| 24 Jul 2009
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LP3985IM5-285
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LP3985IM5-2.6
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IM5-3.1
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LP3985IM5X-2.6
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LP3985IM5X-2.7
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IM5X-2.9
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LP3985IM5X-3.1
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LP3985IM5X-3.2
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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General Description
The LP3985 is designed for portable and wireless applications with demanding performance and space requirements.
The LP3985 is stable with a small 1µF ±30% ceramic or high-quality tantalum output capacitor. The micro SMD requires the smallest possible PC board area - the total application circuit area can be less than 2.0mm x 2.5mm, a fraction of a 1206 case size.
The LP3985's performance is optimized for battery powered systems to deliver ultra low noise, extremely low dropout voltage and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life.
An optional external bypass capacitor reduces the output noise without slowing down the load transient response. Fast start-up time is achieved by utilizing an internal power-on circuit that actively pre-charges the bypass capacitor.
Power supply rejection is better than 50 dB at low frequencies and starts to roll off at 1kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits.
The device is ideal for mobile phone and similar battery powered wireless applications. It provides up to 150 mA, from a 2.5V to 6V input. The LP3985 consumes less than 1.5µA in disable mode and has fast turn-on time less than 200µs.
The LP3985 is available in a 5 bump small bump micro SMD, a 5 bump large bump micro SMD, a 5 bump thin micro SMD and a 5 pin SOT-23 package. Performance is specified for -40°C to +125°C temperature range and is available in 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V. 3.1V, 3.2V, 3.3V, 4.7V, 4.75V, 4.8V and 5.0V output voltages. For other output voltage options between 2.5V to 5.0V or for a dual LP3985, please contact National Semiconductor sales office.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LP3985IM5-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-2.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-2.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-2.9 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-285 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-3.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-3.1 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-3.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-4.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5-5.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-2.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-2.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-2.9 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-285 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-3.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-3.1 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-3.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-4.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985IM5X-5.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-2.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-2.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-2.9 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-285 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-3.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-3.1 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-3.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-4.75 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-4.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITL-5.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-2.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-2.7 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-2.9 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-285 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-3.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-3.1 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-3.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-4.75 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-4.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LP3985ITLX-5.0 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1223: Application Note 1228 LP3986 microSMD Evaluation Board Instruction |
29 Kbytes |
14-May-04 |
Download |
| AN-1219: Application Note 1219 LP3985 MicroSMD‐5 Evaluation Board Instruction |
36 Kbytes |
10-May-04 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1228: Application Note 1228 LP3986 microSMD Evaluation Board Instruction |
29 Kbytes |
14-May-04 |
Download |
[Information as of 8-Nov-2009]
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