MIC5259
300mA High PSRR, Low Noise Cap CMOS LDO
General Description Features
The MIC5259 is an efficient CMOS voltage regulator Input voltage range: 2.7V to 6.0V
optimized for low-noise applications. It offers 1.5% initial
PSRR = 70dB @ 1kHz
accuracy, low dropout voltage (300mV at 300mA) and low
Low output noise: 30V(rms)
ground current (typically 105A at light load). The
Stability with ceramic output capacitors
MIC5259 provides a very-low-noise output, ideal for RF
applications where a clean voltage source is required. The Low-dropout: 300mV @ 300mA
MIC5259 has a high PSRR even at low supply voltages,
High-output accuracy:
critical for battery operated electronics. A noise bypass pin
1.5% initial accuracy
is also available for further reduction of output noise.
3.0% over temperature
Designed specically for handheld and battery-powered
Low quiescent current: 105A
devices, the MIC5259 provides a TTL-logic-compatible
Tight load and line regulation
enable pin. When disabled, power consumption drops to
nearly zero. TTL-Logic-controlled enable input
The MIC5259 also works with low-ESR ceramic Zero off-mode current
capacitors, reducing the amount of board space necessary
Thermal shutdown and current limit protection
for power applications; critical issue in handheld wireless
devices.
Applications
Key features include current limit, thermal shutdown, faster
Cellular phones and pagers
transient response, and an active clamp to speed up
Cellular accessories
device turn-off. The MIC5259 is available in the 6-pin
Battery-powered equipment
2mm 2mm MLF package and the 5-pin Thin SOT-23
package in a wide range of output voltages.
Laptop, notebook, and palmtop computers
Data sheets and support documentation can be found on
Consumer/personal electronics
Micrels web site at www.micrel.com.
Industrial portable electronics
PC peripherals
Typical Application
MIC5259-x.xBD5/YD5
V V
V IN OUT
V
IN
OUT
15 MIC5259-x.xBML/YML
C = 1.0F
IN
ENABLE
Ceramic C = 1.0F
2 1 6
EN OUT
SHUTDOWN C
BYP
C = 1.0F
OUT
(optional)
3 4
Enable
2 5
Ceramic
Shutdown
C = 1.0F
EN 0.01F
IN
3 4
EN (pin 3) may be
C = 0.01F
connected directly BYP
to IN (pin 1).
Ultra-Low Noise Regulator Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5259
(1)
Ordering Information
Part Number Marking
Junction
Voltage Temp. Range** Package
Standard Pb-Free Standard Pb-Free*
MIC5259-1.5BD5 MIC5259-1.5YD5 NY15 NY15 1.5V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-1.8BD5 MIC5259-1.8YD5 NY18 NY18 1.8V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-2.5BD5 MIC5259-2.5YD5 NY25 NY25 2.5V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-2.8BD5 MIC5259-2.8YD5 NY28 NY28 2.8V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-2.85BD5 MIC5259-2.85YD5 NY2J NY2J 2.85V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-3.0BD5 MIC5259-3.0YD5 NY30 NY30 3.0V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-3.3BD5 MIC5259-3.3YD5 NY33 NY33 3.3V 40C to +125C 5-Pin Thin SOT23-5
MIC5259-1.5YML Y15 1.5V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-1.8YML Y18 1.8V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-2.1YML Y21 2.1V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-2.5BML MIC5259-2.5YML Y25 Y25 2.5V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-2.8BML MIC5259-2.8YML Y28 Y28 2.8V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-2.85BML MIC5259-2.85YML Y2J Y2J 2.85V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-3.0BML MIC5259-3.0YML Y30 Y30 3.0V 40C to +125C 6-Pin 2mm x 2mm MLF
MIC5259-3.3BML MIC5259-3.3YML Y33 Y33 3.3V 40C to +125C 6-Pin 2mm x 2mm MLF
* Under bar / Over bar symbol ( _ / ) may not be to scale.
** Other voltages available, please contact Micrel Marketing for details.
Pin Configuration
EN GND IN
3 2 1 EN 1 6 BYP
Yxx
NYxx
GND 2 5 NC
NYxx
Yxx
45
IN 3 4 OUT
BYP OUT
MIC5259-x.xBD5/YD5 MIC5259-x.xBML/YML
5-Pin Thin SOT-23 (D5) 6-Pin 2mm x 2mm MLF (ML)
(Top View) (Top View)
Pin Description
Pin Number Pin Number Pin Name Pin Name
TSOT-23-5 MLF -6
1 3 IN Supply Input
2 2 GND Ground
3 1 EN Enable/Shutdown (Input): CMOS compatible input. Logic high =
enable; logic low = shutdown. Do not leave open.
Reference Bypass: Connect external 0.01F CBYP 1.0F
4 6 BYP
capacitor to GND to reduce output noise. May be left open.
5 4 OUT Regulator Output
5 NC No Connect
M9999-091406
September 2006 2