LX1910 Datasheet, PDF (1/8 Pages) Microsemi Corporation – Step-Down Regulator

LX1910
TM
®
Step-Down Regulator
PRODUCTION DATA SHEET
DESCRIPTION
The LX1910 PWM buck regulator
achieves very high efficiencies over a
broad range of operating load
conditions. The LX1910 implements
a load-detection architecture and
enters a power-saving PFM mode
when driving small load currents
ensuring optimal regulator efficiency
over the entire output current range
thus maximizing battery life.
The LX1910 does not require a
minimum load current for stable
operation. There is no Under Voltage
Lockout for the input voltage,
operational range includes 4V to 6V.
The regulator is capable of providing
an output dc load current of 850mA.
The SHDN pin places the device in a
sleep-mode drawing less than 1µA of
quiescent current.
The PWM operating mode
implements a fixed frequency of
1MHz (typ), the transconductance
error amplifier has 12µA of drive
with an output voltage swing rail to
rail. Compensation is external for
maximum user flexibility.
The LX1910 comes in space-saving
MSOP package allowing a complete
application circuit to occupy a very
small PCB area. These features make
the LX1910 ideal for use in
SmartPhones, PDAs, or other battery-
operated devices
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ Internal Reference 1.17V
±2% Accuracy (Line and
Temperature)
ƒ 4V to 6.0V Input Range
ƒ Adj. Output From 1.17V to V_IN
ƒ Output Current (I_DC >850mA)
ƒ Quiescent Current < 300µA
ƒ 1MHz Operation Frequency
ƒ MSOP 8-Pin
APPLICATIONS/BENEFITS
ƒ Portable Microprocessor Core
Voltage Supplies
ƒ 5V to 3V
V_IN
C_IN
R_C
C_C
PRODUCT HIGHLIGHT
LX1910
PVIN
AVIN
SHDN
COMP
SW
D
FB
AGND PGND
L
C_X
R₁
R₂
V_OUT
C_OUT
90%
80%
70%
60%
50%
40%
30%
LX1910 Efficiency @ Vout=1.5V
20%
10%
0
100 200 300 400 500 600 700
OUTPUT CURRENT, mA
Figure 1 – LX1910 Circuit Topology and Typical Efficiency Performance
PACKAGE ORDER INFO
T_J(°C)
Input
Voltage
Output
Voltage Range
Plastic MSOP
DU 8-PIN
RoHS Compliant / Pb-free
0 to 85
4.5V – 6.0V 1.17V to V_IN
LX1910CDU
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX1910-13016CDU-TR)
Copyright © 2004
Rev. 1.1, 2005-02-25
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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