MIC5159
Programmable Current Limit 礐ap LDO
Regulator Controller
 
 
 
IttyBitty is a registered trademark of Micrel, Inc. 
 
 
Micrel Inc. " 2180 Fortune Drive " San Jose, CA 95131 " USA " tel +1 (408) 944-0800 " fax + 1 (408) 474-1000 " http://www.micrel.com
June 2006 
 
M9999-062706
 
 
 
 
General Description    
 
Micrels   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 礐ap design, the MIC5159 is stable
with ceramic output capacitors.
The MIC5159 is packaged in the IttyBitty
?/DIV>
 SOT-23-6, and
is offered in fixed and adjustable output voltages. Junction
temperature range of the MIC5159 is from 40癈 to
+125癈.
Features
" Fast transient response
" Input voltage range: V
IN
 1.65V to 5.5V
" ?.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
?/DIV>
 SOT-23-6 package
" Available temperature range:40癈 to +125癈
"
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
 
GATE
EN
FB
V
IN
IN
IS
V
OUT
GND
U1 MIC5159BM6/YM6
Q1Q4
SUB15P0152 ?4
R1
5
1
3
GND
C1
R2
GND
C1
C1
 
Adjustable Output Voltage
V
IN
 = 3.3V
V
OUT
 = 2.5V
C
OUT
 = 200礔
10A
100mA
 
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