MIC5159 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – PROGRAMMABLE CURRENT LIMIT UCAP LDO REGULATOR CONTROLLER

MIC5159
Micrel
MIC5159
Programmable Current Limit µCap LDO Regulator Controller
General Description
Micrel’s MIC5159 is a precision-voltage regulator controller.
Used with an external P-Channel MOSFET, the MIC5159
forms a two-chip low-dropout regulator capable of driving a
wide range of output currents.
The MIC5159 operates from an input of 1.65V to 5.5V. The
low input voltage allows the MIC5159 to operate off of high
power 1.8V rails to generate lower voltages such as 1.5V.
Features of the MIC5159 include enable input and current-
limit protection. As a µCap design, the MIC5159 is stable with
ceramic output capacitors.
The MIC5159 is packaged in the IttyBitty^® SOT-23-6, and is
offered in fixed and adjustable output voltages. Junction
temperature range of the MIC5159 is from –40°C to +125°C.
Features
• Fast transient response
• Input voltage range: V_IN 1.65V to 5.5V
• ±1.0% initial output tolerance
• Fixed 1.8V or adjustable output voltage down to 1.25V
• Stable with ceramic output capacitor
• Capable up to 10A
• Excellent line and load regulation specifications
• Logic-controlled shutdown
• Programmable current limit
• Current-limit protection
• IttyBitty^® SOT-23-6 package
• Available temperature range: –40°C to +125°C
Applications
• Ultra-high current, ultra-low dropout voltage regulator
• High-efficiency linear power supplies
• Low-voltage distributed power
• Fixed telecom
• Multimedia and PC power supplies
• Battery chargers
• Low-voltage DSP, microprocessor and microcontroller
power supplies
Ordering Information
Part Number
Voltage Marking
MIC5159BM6
ADJ.
LZAA
MIC5159-1.8BM6
1.8V
LZ18
MIC5159-3.0BM6
3.0V
LZ30
Other voltages available. Contact Micrel for details.
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-6
SOT-23-6
SOT-23-6
Typical Application
V_IN
C1
GND
Q1ÐQ4
SUB15P01Ð52 ´ 4
U1 MIC5159BM6
5
R1
EN
GATE
1 _IN
FB
C1
3 _{IS GND}
R2
Adjustable Output Voltage
V_OUT
C1
GND
Load Transient Response
10A
100mA
V_IN = 3.3V
V_OUT = 2.5V
C_OUT = 200µF
TIME (20µs/div.)
IttyBitty is a registered trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2004
1
M9999-041204