lx1910 Microsemi Corporation, lx1910 Datasheet

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lx1910

Manufacturer Part Number
lx1910
Description
Step-down Regulator
Manufacturer
Microsemi Corporation
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
lx1910CDU
Manufacturer:
MSC
Quantity:
20 000
Copyright © 2004
Rev. 1.1, 2005-02-25
achieves very high efficiencies over a
broad
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.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
V
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.
IN
The LX1910 PWM buck regulator
The
C
IN
TM
range
PWM
C
R
C
C
of
LX1910
operating
PVIN
AVIN
SHDN
COMP
AGND
operating
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Figure 1 – LX1910 Circuit Topology and Typical Efficiency Performance
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
PGND
D E S C R I P T I O N
0 to 85
T
SW
J
FB
mode
(°C)
(i.e. LX1910-13016CDU-TR)
load
D
minimum load current for stable
operation. There is no Under Voltage
Lockout
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.
MSOP package allowing a complete
application circuit to occupy a very
small PCB area. These features make
the
SmartPhones, PDAs, or other battery-
operated devices
The LX1910 comes in space-saving
The LX1910 does not require a
C
4.5V – 6.0V
X
P R O D U C T H I G H L I G H T
Voltage
L
Input
Integrated Products Division
LX1910
PACKAGE ORDER INFO
R
R
1
2
®
Microsemi
for
the
ideal
Voltage Range
C
1.17V to V
OUT
input
Output
V
for
OUT
use
voltage,
IN
90%
80%
70%
60%
50%
40%
30%
20%
10%
Step-Down Regulator
P
RODUCTION
in
0
DU
RoHS Compliant / Pb-free
LX1910CDU
100
LX1910 Efficiency @ Vout=1.5V
Plastic MSOP
8-PIN
APPLICATIONS/BENEFITS
200
OUTPUT CURRENT, mA
D
Internal Reference 1.17V
±2% Accuracy (Line and
Temperature)
4V to 6.0V Input Range
Adj. Output From 1.17V to V
Output Current (I
Quiescent Current < 300µA
1MHz Operation Frequency
MSOP 8-Pin
Portable Microprocessor Core
Voltage Supplies
5V to 3V
ATA
K E Y F E A T U R E S
300
S
HEET
400
500
DC
>850mA)
LX1910
600
700
IN
Page 1

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lx1910 Summary of contents

Page 1

... IN COMP FB R AGND PGND Figure 1 – LX1910 Circuit Topology and Typical Efficiency Performance T (° 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 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® ...

Page 2

... The θ numbers are guidelines for the thermal ESCRIPTION Microsemi Integrated Products Division LX1910 Step-Down Regulator RODUCTION ATA HEET PVIN ...

Page 3

... Device 0.5A DS(ON 0.5A (assured by design, not ATE tested LEAK I LIM 1.5V, 5mA < I < 700mA, ckt figure Microsemi Integrated Products Division LX1910 Step-Down Regulator RODUCTION ATA HEET =25°C. A Min Typ Max 3.5 6.0 V 0.95*VIN FB 1.146 1.170 1.193 300 500 ...

Page 4

... AVIN comparator PWM Logic - agnd OSC Skip Mode Thermal Sense PGND AGND Figure 2 – LX1910 Block Diagram LX1910 4.7µH PVIN SW AVIN 3300pF SHDN D COMP FB AGND PGND Figure 3 – Circuit for 1.5V Output Voltage ...

Page 5

... Basic design rules include: (1) maintaining wide traces for power components (e.g., width > 50mils); (2) place C diode, and the inductor close to the LX1910; (3) minimizing trace capacitance by reducing the etch area connecting the SW pin to the inductor; and (4) minimizing the etch length to ...

Page 6

... TM LX1910 LOAD REGULATION (Vout=1.5V) 0.15% 0.10% 0.05% 0.00% -0.05% -0.10% -0.15% -0.20% -0.25% -0.30% -0.35% 0 100 200 300 IOUT, ma Figure 4 1910 LINE REG (Vout=1.5V, Rload=15 ohms) 1.55 1.45 1.35 Vo 1.25 Vout Error 1.15 1.05 0.95 0.85 0.75 0.65 0.55 1 1.5 2 2.5 3 3.5 Vin, volts Figure 6 Copyright © 2004 Rev. 1.1, 2005-02-25 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® ...

Page 7

... and CH4: Figure 10 – Switching Waveforms: PFM Mode OUT = 50 to 600mA CH3: V (pin 8) and CH1 5.0V 10mA) IN OUT Microsemi Integrated Products Division LX1910 D S RODUCTION ATA HEET ; ( V = 5.0V 1mA) OUT IN OUT Page 7 ...

Page 8

... Dim Microsemi Integrated Products Division LX1910 Step-Down Regulator RODUCTION ATA HEET M I ILLIMETERS NCHES MIN MAX MIN MAX 2.85 3.05 .112 .120 2.90 3.10 .114 .122 – ...

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