LX1912CSG MICROSEMI [Microsemi Corporation], LX1912CSG Datasheet

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LX1912CSG

Manufacturer Part Number
LX1912CSG
Description
VREF @ 800mV, 1.0A, 1.2MHz PWM Current Mode PWM Buck regulator
Manufacturer
MICROSEMI [Microsemi Corporation]
Datasheet
Copyright © 2005
Rev. 1.0, 2006-09-06
Mode PWM Buck regulator that
switches to PFM mode with light
loads. The entire regulator function is
implemented
components.
dynamic load changes using a high
bandwidth error amplifier and internal
compensation.
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 V
IMPORTANT: For the most current data, consult MICROSEMI’s website:
4.7µF
The LX1912 operates as a Current
The LX1912 responds quickly to
TM
IN
4V to 6V
.
VCC
GND
VPWR
LX1912
with
Part
N.C.
Tight output voltage
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1912CSG-TR)
0 to +70
T
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
A
SW
few
FB
(°C)
Figure 1 – LX1912 Circuit Topology and Typical Efficiency Performance
D E S C R I P T I O N
external
Input Voltage
4.0V – 6.0V Adjustable
2.7µH
an output load current of 1.0A, has no
minimum load current requirement for
stable operation.
cycle-by-cycle to protect the switch.
Power
maximized with low regulator IQ and
PFM mode of operation
covers 4.0V to 6.0V, features include
power on delay; soft start to limit
inrush currents; and thermal shutdown
during fault conditions.
small form factor with excellent power
dissipation capability.
10K
31.6K
The regulator is capable of providing
The
The 6-pin TSOT package provides a
P R O D U C T H I G H L I G H T
P A C K A G E O R D E R I N F O
Integrated Products Division
LX1912
30µF
Voltage
Output
Range
®
conversion
Microsemi
http://www.microsemi.com
3.3V @ 1.0A
operational
SG
Current limit is
RoHS Compliant / Pb-free
VREF @ 800mV, 1.0A, 1.2MHz PWM
efficiency
LX1912CSG
6-Pin
Plastic TSOT
range
P
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
RODUCTION
is
0.01
EFFICIENCY (VIN = 5V, VOUT @ 3.3V)
OUTPUT CURRENT (Amps)
D
Part Marking
Accuracy (Line and Temp.)
of V
Typical @ 23°C
Internal Reference 800mv ±2%
4.0V to 6.0V Input Range
Internal Soft Start
Adj. Output From 0.8V to 90%
Output Current up to 1.0A
Quiescent Current < 550μA,
1.2MHz PWM Frequency
Over Voltage Protection
Portable Microprocessor Core
Voltage Supplies
5V to 3V
RoHS Compliant Product
ATA SHEET
K E Y F E A T U R E S
IN
A P P L I C A T I O N S
1912
0.10
LX1912
1.00
Page 1

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LX1912CSG Summary of contents

Page 1

... Figure 1 – LX1912 Circuit Topology and Typical Efficiency Performance T (°C) Input Voltage +70 4.0V – 6.0V Adjustable Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1912CSG-TR) Copyright © 2005 Rev. 1.0, 2006-09-06 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 VREF @ 800mV, 1.0A, 1.2MHz PWM ® P ...

Page 2

Input Voltage (VCC and VPWR).......................................................................................-0. GND.............................................................................................................-0. GND..........................................................................................................................-0.3V to +2V ...

Page 3

TM Specifications apply over junction temperature of: -20°C < T Parameter Symbol 1 Operating Range Feed Back Threshold FB Input Current Error Amplifier Quiescent Operating Current I Soft Start, V Slew Rate OUT P-Channel Switch ON Resistance Maximum Duty Cycle ...

Page 4

TM Bias VCC UVLO Clock And Ramp 920mV REF LX1912 V IN Copyright © 2005 Rev. 1.0, 2006-09-06 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 VREF @ 800mV, 1.0A, 1.2MHz PWM ® ...

Page 5

UNCTIONAL ESCRIPTION The LX1912 is a Current Mode PWM regulator with internal compensation. The internal PMOS high side switch is protected with current limit on a pulse by pulse basis and with thermal shutdown. Thermal shutdown is ...

Page 6

TM UVLO THRESHOLDS- VIN RISING and FALLING 1.4 1.2 1 0.8 0.6 0.4 0.2 0 VIN, volts Figure 4– Under Voltage Lockout for V Figure 6 – Step Load Response 300mA to 800mA 2.7µH, C OUT Copyright © ...

Page 7

Pin TSOT Copyright © 2005 Rev. 1.0, 2006-09-06 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 VREF @ 800mV, 1.0A, 1.2MHz PWM ® ...

Page 8

TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not ...

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