LX1732 Datasheet, PDF (3/12 Pages) Microsemi Corporation – High Current PFM Boost Converter

INTEGRATED PRODUCTS
LX1732
High Current PFM Boost Converter
PRODUCTION DATA SHEET
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
Parameter
Symbol
Test Conditions
` PFM Regulator
Operating Voltage
Minimum Operating Voltage
Minimum Start-up Voltage
Start-up Voltage Temperature
Coefficient
Output Voltage Range
V<sub>IN</sub>
V<sub>IN</sub>
κ<sub>SU</sub>
V<sub>OUT</sub>
Steady State Output Current
I<sub>OUT</sub>
Internal N-FET On-resistance
Switch Current Limit
Switch Pin Leakage Current
Oscillator Frequency
Duty Cycle
R<sub>DS(ON)</sub>
I<sub>SW</sub>
I<sub>LEAK</sub>
f<sub>OSC</sub>
D
Operating Current
I<sub>Q</sub>
` Error Amplifier
Voltage Feed Back Threshold
V_FB
Voltage Feed Back Input Current I_FB
` Shutdown Circuit
SHDN Input Bias Current
I<sub>SHDN</sub>
I<sub>OUT</sub> ≅ 1mA
T<sub>A</sub> = +25°C; I<sub>OUT</sub> < 10mA
V<sub>OUT</sub> = 3.3V: GBNT
V<sub>OUT</sub> = 5V: GBNT
I<sub>LX</sub> = 100mA
V<sub>LX</sub> = 5.5V, V<sub>OUT</sub> = 5V
V<sub>FB</sub> = 1V; T<sub>A</sub> = +25°C
V<sub>FB</sub> = 1V; T<sub>A</sub> = +25°C
(into VC pin)
T<sub>A</sub> = +25°C
V<sub>FB</sub> = 1.4V
SHDN = GND
SHDN High Input Voltage
V<sub>SHDN</sub>
SHDN Low Input Voltage
Shutdown Operating Current
` Low Battery Detect
Low Battery Detect Output
Voltage
Low Battery Detect Output
Leakage Current
Low Battery Threshold
Hysteresis
V_SHDN
I_Q
SHDN = GND
V _LBO
I _LBO
V_LBT
V_HLBT
V_LBI = 0V, I_LBO = -1mA
V_LBI = V_IN, V_LBO = 5V
T_A = +25°C
LX1732
Units
Min Typ Max
1.1
5.5
V
0.7
V
1.1
V
-2
mV/°C
2.2
5.5
V
250
100
mA
0.2
1.0
Ω
0.47
1.0
A
1.0 µA
65 100 135 kHz
65
75
85
%
200 µA
1.170 1.200 1.230 V
300 nA
V_IN/2
100 nA
V
0.4
V
1
µA
0.5
V
1
µA
0.54
0.71 V
80
Copyright © 2000
Rev. 1.1c, 2005-03-03
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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