LP3985IM5X-2.5 Datasheet, PDF (1/29 Pages) Texas Instruments – LP3985 Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator

LP3985
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SNVS087AC – OCTOBER 2000 – REVISED MAY 2013
LP3985 Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator
Check for Samples: LP3985
FEATURES
1
•2 Miniature 5-I/O DSBGA and USON Package
• Logic Controlled Enable
• Stable with Ceramic and High Quality
Tantalum Capacitors
• Fast Turn-on
• Thermal Shutdown and Short-Circuit Current
Limit
APPLICATIONS
• CDMA Cellular Handsets
• Wideband CDMA Cellular Handsets
• GSM Cellular Handsets
• Portable Information Appliances
KEY SPECIFICATIONS
• 2.5 to 6.0V Input Range
• 150mA Verified Output
• 50dB PSRR at 1kHz @ VIN = VOUT + 0.2V
• ≤1.5μA Quiescent Current when Shut Down
• Fast Turn-On time: 200μs (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
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 DSBGA
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 startup time is achieved by utilizing an
internal power-on circuit that actively pre-charges the
bypass capacitor.
Power supply rejection is better than 50dB 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 150mA, 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.
Typical Application Circuit
1(C3)
VIN
5(C1)
VOUT
1PF
LP3985
1PF
3(A1)
VEN _BYPASS
2(B2)
4(A3)
*
Pin Numbers in parenthesis indicate DSBGA package.
* Optional Noise Reduction Capacitor.
Figure 1.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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