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LX1732-03 EVAL KIT

P1-P3P4-P6P7-P9P10-P12
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2000
Rev. 1.1c, 2005-03-03
WWW.Microsemi .COM
LX1732
Hi
g
h Current PFM Boost Converter
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
DESCRIPTION
The LX1732 is a compact, high
efficiency, step-up DC-DC boost
regulator implemented in a
BiCMOS process technology. This
device features variable frequency
operation and a built in N-channel
MOSFET power switch for
optimal functioning in low voltage
portable systems.
Start-up operation is guaranteed
from 1.1V inputs (at light load)
and the input voltage can be as low
as 0.7V after start-up. This
attribute allows the LX1732 to
operate in an extended power-
savings mode, supplying (data)
critical system components, even
after battery capacity no longer
supports normal operation.
The output voltage programming
range of 2.2V to 5V, requires only
two external resistors via the
feedback pin (see Figure 1.0).
Output load currents of up to
200mA are achievable and the
internal MOSFET is capable of
switching up to a 1A current limit.
Quiescent current during operation
is 200µA (max) and in shutdown-
mode drops to a mere 1µA thus
maximizing overall battery life-
time.
The LX1732 features a low
battery-detect circuitry that alerts
system power management of low
input voltages thus allowing
portable systems to enter a power-
savings mode (e.g., to protect data)
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
88% Efficiency
200µA Quiescent Current
0.1µA Logic Shutdown
Low-Battery Detector
8-Pin MSOP Package
APPLICATIONS/BENEFITS
Pagers
Wireless Phones
Hand-Held Computers
PDAs
RF Tags
Two-cell Alkaline Battery
Applications
Single-cell Lithium Ion 5V
Boost
PRODUCT HIGHLIGHT
V
BAT
V
OUT
LX1732
GND
VC
FB
SW
SHDN
IN
LBI
LBO
L
D
C
OUT
R
1
R
2
R
3
R
4
C
IN
50%
60%
70%
80%
90%
100%
0 25 50 75 100 125 150 175 200
Output Current
Efficiency (%)
Figure 1 – LX1732 General Circuit Topology and Typical Efficiency Performance
PACKAGE ORDER INFO
DU
Plastic MSOP
8-Pin
T
A
(°C)
RoHS Compliant / Pb-free
Transition DC: 0432
0 to 70
LX1732CDU
Note: Available in Tape & Reel. Append the letters “TR” to the part
number. (i.e. LX1732CDU-TR)
L
L
X
X
1
1
7
7
3
3
2
2
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2000
Rev. 1.1c, 2005-03-03
WWW.Microsemi .COM
LX1732
Hi
g
h Current PFM Boost Converter
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
IN
) ........................................................................-0.3V to 7.0V
Output Voltage (V
C
) .........................................................................-0.3V to 7.0V
Switch Voltage (V
SW
) .......................................................................-0.3V to 7.0V
Shutdown Input Voltage (V
SHDN
) ......................................... -0.3V to (V
C
+ 0.3V)
Low Battery Detect Output (V
LBO
) ......................................
-0.3V to (V
C
+ 0.3V)
Low Battery Detect Input Voltage (V
LBI
) .............................. -0.3V to (V
C
+ 0.3V)
Feedback Input Voltage (V
FB
) ............................................... -0.3V to (V
C
+ 0.3V)
Switch Current (I
LX
).................................................................................. 1.0A
RMS
Operating Temperature Range............................................................ 0°C to 70°C
Operating Junction Temperature.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Peak Package Temp for Solder Reflow (40 second max. exposure) ............. 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal
.
THERMAL DATA
DU
Plastic MSOP 8-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
206°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
39°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x θ
JC
).
The θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
PACKAGE PIN OUT
1
2
4
3
5
6
8
7
SW
LBI
VIN
VC
GND
FB
LBO
SHDN
DU
P
ACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
FUNCTIONAL PIN DESCRIPTION
N
AME
D
ESCRIPTION
IN
Unregulated IC Supply Voltage Input – Input range from +1.1V to 5.5V. Bypass with a 4.7µF or greater capacitor.
FB
Control pin for output voltage programming. Connect this pin to a resistive divider network between the output
and GND to obtain an output voltage between 2.0V and 5.5V.
SHDN
Active-Low Shutdown Input – A logic low shuts down the device and reduces the supply current to 0.1µA.
Connect
SHDN
to V
CC
for normal operation.
SW Inductor Switching Connection – Internally connected to the drain of an N-channel MOSFET.
VC Output voltage control pin: Connect this pin to the circuit load and cathode of the switching diode.
GND Common terminal for ground reference.
LBI
Low Battery Detect Comparator Input – Connect to a resistive divider network between the V
CC
and GND to set
the Low Battery Detect trip point. The LBI threshold is 0.6V.
LBO
Low Battery Detect Comparator Output – Open drain comparator output. This output is pulled low when V
LBI
is
less than 0.6V.
LBO is high impedance during shutdown.
P
P
A
A
C
C
K
K
A
A
G
G
E
E
D
D
A
A
T
T
A
A
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2000
Rev. 1.1c, 2005-03-03
WWW.Microsemi .COM
LX1732
Hi
g
h Current PFM Boost Converter
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C
≤
T
A
≤
70°C
except where otherwise noted and the following test conditions: V
IN
= 2V, V
OUT
= 3.3V, R
LOAD
= 3kΩ, V
SHDN
= 2V
LX1732
Parameter Symbol Test Conditions
Min Typ Max
Units
`
PFM Regulator
Operating Voltage V
IN
1.1 5.5 V
Minimum Operating Voltage V
IN
I
OUT
≅
1mA
0.7 V
Minimum Start-up Voltage
T
A
= +25
°
C; I
OUT
< 10mA
1.1 V
Start-up Voltage Temperature
Coefficient
κ
SU
-2
mV/
°
C
Output Voltage Range V
OUT
2.2 5.5 V
V
OUT
= 3.3V: GBNT 250
Steady State Output Current I
OUT
V
OUT
= 5V: GBNT 100
mA
Internal N-FET On-resistance R
DS(ON)
I
LX
= 100mA 0.2 1.0
Ω
Switch Current Limit I
SW
0.47 1.0 A
Switch Pin Leakage Current I
LEAK
V
LX
= 5.5V, V
OUT
= 5V 1.0
µ
A
Oscillator Frequency f
OSC
V
FB
= 1V; T
A
= +25
°
C
65 100 135 kHz
Duty Cycle D
V
FB
= 1V; T
A
= +25
°
C
65 75 85 %
Operating Current I
Q
(into VC pin) 200
µ
A
`
Error Amplifier
Voltage Feed Back Threshold V
FB
T
A
= +25
°
C
1.170 1.200 1.230 V
Voltage Feed Back Input Current I
FB
V
FB
= 1.4V 300 nA
`
Shutdown Circuit
SHDN
Input Bias Current
I
SHDN
SHDN
= GND
100 nA
SHDN
High Input Voltage
V
SHDN
V
IN
/2 V
SHDN
Low Input Voltage
V
SHDN
0.4 V
Shutdown Operating Current I
Q
SHDN
= GND
1
µ
A
`
Low Battery Detect
Low Battery Detect Output
Voltage
V
LBO
V
LBI
= 0V, I
LBO
= -1mA
0.5 V
Low Battery Detect Output
Leakage Current
I
LBO
V
LBI
= V
IN
, V
LBO
= 5V
1
µ
A
Low Battery Threshold V
LBT
0.54 0.71 V
Hysteresis V
HLBT
T
A
= +25
°
C
80
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P1-P3P4-P6P7-P9P10-P12

LX1732-03 EVAL KIT

Mfr. #:
Buy LX1732-03 EVAL KIT
Manufacturer:
Microchip / Microsemi
Description:
Power Management IC Development Tools DC:DC Converter
Lifecycle:
New from this manufacturer.
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