LX13097
1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD
ADVANCE DATA SHEET
Pb Free Product
DESCRIPTION
The LX13097 is a current mode PWM buck switcher
with internal compensation, can provide up to 1A output
current with FET on board. It operates from 2.8V to 5.5V
and output as low as 0.6V which is ideal for the applica-
tion with single cell Li-Ion battery as well as other 3.3V
input bus supply applications. Switching frequency is
fixed 1MHz, small surface mount inductors and capaci-
tors are allowed to use, make it good for portable appli-
cations.
LX13097 is available in 5-pin SOT23 package.
FEATURES
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SOT23-5L package
Internal Digital Soft Start
Internally-compensated Current Mode Controller
<1uA Shut-down Current
Peak Current Limit with HICCUP Feature and Over
Temperature Protection
Prebias Start-up Operation
Enable Available
Pb-free and RoHS Compliant
APPLICATIONS
Li-Ion battery operated portable system
Cellular Phones
Portable applications
USB Devices
TYPICAL APPLICATION
VIN=5V
1
5
EN
FB
VIN
SW
GND
4
3
2
22uF(X5R,6.3V)
Figure1 - Typical application of LX13097
LX13097
2.2uH
Vout=2.5V
10uF
(X5R,6.3V)
332k
105k
ORDERING INFORMATION
Device
LX13097CSE
Temperature
-40
o
C to 85
o
C
Package
SOT23-5L
Pb-Free
Yes
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX13097CSE-TR)
Rev. 1.1
12/30/09
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1
LX13097
ABSOLUTE MAXIMUM RATINGS
VIN to GND ..................................................................... -0.3V to 6V
SW, FB, EN to GND ........................................................ -0.3V to VIN + 0.3V
ESD Susceptibility ............................................................. 1kV
Lead Temperature(Soldering,10sec.) .................................... 260
o
C
Storage Temperature Range ................................................ -55
o
C to 150
o
C
Operating Junction Temperature Range ................................ -40
o
C to 150
o
C
CAUTION: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to
the device. This is a stress only rating and operation of the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied.
PACKAGE INFORMATION
5-LEAD PLASTIC SOT23
θ
JA
≈ 110
o
C
/
W
EN
GND
1
2
5
FB
ARG1
SW 3
4
VIN
SE Package (Top View)
Top marking: ARG1
Bottom marking: "xxxx" Denote Date Code and Lot Identification
ELECTRICAL SPECIFICATIONS
V
IN
=3.5V. Typical data refers to T
A
= 25
o
C. Unless otherwise specified.
PARAMETER
Reference Voltage
Ref Voltage
Line Regualtion
Line Regulation
VIN UVLO
VIN Rising Threshold
VIN Falling Threshold
Supply Voltage(VIN)
VIN Input Voltage Range
Shutdown Current
Quiescent Current
Oscillator (Rt)
Frequency
Max Duty Cycle
Min ON time
V
IN
I
shutdown
I
q
F
S
EN=GND
No Load, switching
800
78
2.8
1
4
1000
86
100
1200
SYM
V
REF
VIN=3V to 5V,VOUT=1.8V,
IOUT=10mA
2.3
Test Condition
Min
0.59
TYP
0.6
2
MAX
0.607
Units
V
mV
2.5
2.3
2.8
V
V
5.5
2.5
V
uA
mA
kHz
%
nS
Rev. 1.1
12/30/09
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
2
LX13097
PARAMETER
Error Amplifiers
Feedback Input Bias Current
SS
Soft Start time
Current Limit
Current Limit Threshold
Thermal Shutdown
Thermal shutdown trip point
Hysteresis
Internal Switch
Rdson of Control FET
Rdson of Synchronous FET
Enable
En low Threshold voltage
En high Threshold voltage
Vin=5V
Vin=3.3V
Vin=5V
Vin=3.3V
Tss
500
1.8
155
15
400
480
300
360
0.4
1.4
SYM
Test Condition
Min
TYP
MAX
0.05
Units
uA
uS
A
o
o
C
C
mohm
mohm
V
V
PIN DESCRIPTIONS
PIN SYMBOL
SW
PIN DESCRIPTION
SW output. Junction of the internal high-side and low-side power MOSFETs, and
output inductor.
Ground Connection for Chip. Connect GND with large copper areas to the input and
output supply returns, and negative terminals of the input and output capacitors.
Error amplifier inverting input. This pin is connected via resistor dividers to the output of
the switching regulators to set the output DC voltage. A 332kohm resistor is recom-
mended to be connected from VOUT and FB .
Supply voltage input for switcher.
Enable input. Set this pin to GND or less than 0.4V will shut down the regulator.
Enable signal can not be high when VIN is low.
GND
FB
VIN
EN
Rev. 1.1
12/30/09
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
3
LX13097
BLOCK DIAGRAM
Thermal
Shutdown
POR
EN
POR
VIN
CLK
VIN
start
Soft start
Hiccup
timer
OSC
70ns
one shot
reset dom
S
Q
R
+
UVLO
Vref
Bias
Generator
3 cycle
counter
OCPB
+
-
Vref
PWM
FB
1Mohm
20pF
PWM comparator
OCPB
POR
VIN
LDen
Control
Logic
SW
GND
Figure 2 - Simplified block diagram of the LX13097
Rev. 1.1
12/30/09
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
4
LX13097
Typical Operating Characteristics
R e ference voltage vs tem p e rature
0.604
0.603
0.602
Reference voltage(V)
0.601
0 .6
0.599
0.598
0.597
0.596
0.595
0.594
0.593
0
20
40
60
80
t e m p e r a t u r e (°C )
100
120
140
160
Fig.3 - Reference volateg vs temperature
Normalized frequency vs temperature
1
Normalized Frequency
0.98
0.96
0.94
0.92
0.9
0
20
40
60
80
100
120
140
160
temperature(°C)
Fig.4 - Normalized frequency vs temperature
Rev. 1.1
12/30/09
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
5
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