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参数资料
| 型号： | LX1911CLD-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 3 X 3 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, PLASTIC, MO-229, 6 PIN |
| 文件页数： | 1/7页 |
| 文件大小： | 152K |
| 代理商： | LX1911CLD-TR |
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2004
Rev. 1.1, 2006-05-15
WWW
.Microse
m
i
.CO
M
LX1911
1.5A, 1.1MHZ PWM Step-Down Regulator
PRODUCTION DATA SHEET
TM
DESCRIPTION
The LX1911 operates as a Current
Mode PWM Buck regulator that
switches to PFM mode with light
loads. The entire regulator function
is implemented with minimal external
components.
The LX1911 responds quickly to
dynamic load changes using a high
bandwidth
error
amplifier
and
internal compensation.
Tight output
voltage regulation is maintained with
the
compensated
800mV,
±2%
reference (line and temp regulation).
With two external resistors the output
voltage is easily programmed, from
800mV to 90% of VIN.
The regulator is capable of providing
an output load current of 1.5A and has
no minimum load current requirement
for stable operation. Current limit is
cycle-by-cycle to protect the switch.
Power
conversion
efficiency
is
maximized with a low regulator IQ and
PFM mode of operation.
The
LX1911
operational
range
covers 4.0V to 6.0V, features include
power on delay; soft start to limit
inrush currents; and thermal shutdown
during fault conditions.
The 6-pin package is a small, RoHS
compliant / Pb-free, MO-229 with
excellent power dissipation capacity.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATUR ES
Internal Reference 800mv ±2%
Accuracy (Line and Temp.)
4.0V to 6.0V Input Range
Internal Soft Start
Adj. Output From 0.8V to VIN
Output Current (I >1.5A)
Quiescent Current < 550
μA,
typical @ 23°C
1.1MHz PWM Frequency
Micro Lead-frame, Thin MO-
229, 6-Pin Package
APPLICATIONS/BENEFITS
Portable Microprocessor Core
Voltage Supplies
5V to 3V
PRODUCT H I GHLIGHT
VIN
POWER
VIN
ANALOG
GND
N.C.
SW
FB
1
3
6
4
5
2
4.7F
4.0 to 6V
C
10
3.3H
25K
50K
20F
Ground
Range Tie-in
1.2V @ 1.5A
LX1911
C = 680p
EFFICIENCY vs I
OUT (VIN=5V)
Top V
O=3.375V Lower VO=1.25V
30%
40%
50%
60%
70%
80%
90%
100%
1
10
100
1000
10000
mA
Figure 1 – LX1911 Circuit Topology and Typical Efficiency Performance
PACKAGE ORDER INFO
LD
Plastic MO-229
6 Pin 3mm
TA (°C)
Input Voltage
Output Voltage
Range
RoHS Compliant / Pb-free
0 to 70
4.5V – 5.5V
Adjustable
LX1911CLD
Part Markings
For Tape & Reel, append the letters “TR” to the part number. (i.e. LX1911CLD-TR)
LL
XX
11
99
11
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