LX1910
TM
廬
Step-Down Regulator
P
RODUCTION
D
ATA
S
HEET
KEY FEATURES
Internal Reference 1.17V
鹵2% Accuracy (Line and
Temperature)
4V to 6.0V Input Range
Adj. Output From 1.17V to V
IN
Output Current (I
DC
>850mA)
Quiescent Current < 300碌A(chǔ)
1MHz Operation Frequency
MSOP 8-Pin
APPLICATIONS/BENEFITS
Portable Microprocessor Core
Voltage Supplies
5V to 3V
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 PWM operating mode
implements a fixed frequency of
1MHz (typ), the transconductance
error amplifier has 12碌A(chǔ) of drive
with an output voltage swing rail to
rail. Compensation is external for
maximum user flexibility.
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 1碌A(chǔ) of
quiescent current.
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
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
LX1910 Efficiency @ Vout=1.5V
90%
LX1910
V
IN
C
IN
80%
CONVERSION EFFICIENCY
PVIN
AVIN
SHDN
COMP
R
C
C
C
L
SW
D
C
X
R
1
V
OUT
C
OUT
70%
60%
50%
40%
30%
20%
10%
0
100
200
300
400
500
600
700
OUTPUT CURRENT, mA
FB
PGND
R
2
AGND
Figure 1
鈥?LX1910 Circuit Topology and Typical Efficiency Performance
PACKAGE ORDER INFO
T
J
(擄C)
0 to 85
Input
Voltage
4.5V 鈥?6.0V
Output
Voltage Range
1.17V to V
IN
DU
Plastic MSOP
8-PIN
LX1910
LX1910
RoHS Compliant / Pb-free
LX1910CDU
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number.
(i.e. LX1910-13016CDU-TR)
Copyright
漏
2004
Rev. 1.1, 2005-02-25
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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