MIC5159_06 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – Programmable Current Limit μCap LDO Regulator Controller

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
Typical Application
V_IN
C1
GND
Q1–Q4
SUB15P01–52 × 4
U1 MIC5159BM6/YM6
5
R1
EN
GATE
1
C1
IN
FB
3
IS _GND
R2
Adjustable Output Voltage
V_OUT
C1
GND
10A
100mA
V_IN = 3.3V
V_OUT = 2.5V
C_OUT = 200µF
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
June 2006
M9999-062706