MIC5250 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – Dual 150mA μCap CMOS LDO Regulator Preliminary Information

MIC5250
Micrel
MIC5250
Dual 150mA µCap CMOS LDO Regulator
Preliminary Information
General Description
The MIC5250 is an efficient, precise dual CMOS voltage
regulator optimized for ultra-low-noise applications. The
MIC5250 offers better than 1% initial accuracy, extremely low
dropout voltage (typically 150mV at 150mA) and constant
ground current over load (typically 100µA). The MIC5250
provides a very-low-noise output, ideal for RF applications
where quiet voltage sources are required. A noise bypass pin
is also available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5250 provides TTL logic compatible enable
pins. When disabled, power consumption drops nearly to
zero.
The MIC5250 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, push-
pull outputs for faster transient response, and active clamps
to speed up device turnoff. Available in the 10-lead MSOP
(micro-shrink-outline package), the MIC5250 also offers a
range of fixed output voltages.
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30µV(rms)
• Stability with ceramic, tantalum, or aluminum electrolytic
capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
• “Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA V_CC and V_PP regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Typical Application
Ordering Information
Part Number
Voltage Junction Temp. Range
MIC5250-2.7BMM
2.7V
–40°C to +125°C
MIC5250-2.8BMM
2.8V
–40°C to +125°C
MIC5250-3.0BMM
3.0V
–40°C to +125°C
MIC5250-3.3BMM
3.3V
–40°C to +125°C
Other voltages available. Contact Micrel for details.
Package
10-lead MSOP
10-lead MSOP
10-lead MSOP
10-lead MSOP
V_INA
ENABLE
SHUTDOWN
MIC5250-3.3BMM
OUTA ¹⁰
9 _{INA BYPA} 1
2 _{ENA GNDA} 3
3.3V
C_BYPA
C_OUTA
(optional)
V_INB
ENABLE
SHUTDOWN
7 _INB
5 _ENB
OUTB ⁸
BYPB ⁴
GNDB ⁶
ENA may be connected directly to INA.
ENB may be connected directly to INB.
GNDA and GND B may be connected to
isolated grounds or the same ground.
3.3V
C_BYPB
C_OUTB
(optional)
Dual Ultra-Low-Noise Regulator Circuit
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2000
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MIC5250