lx1912 Microsemi Corporation, lx1912 Datasheet - Page 3

• Manufacturer Part Number: lx1912
• Description: Vref @ 800mv, 1.0a, 1.2mhz Pwm Current Mode Pwm Buck Regulator
• Manufacturer: Microsemi Corporation

Copyright © 2005
Rev. 1.0, 2006-09-06
Specifications apply over junction temperature of: -20°C < T
Operating Range
Feed Back Threshold
FB Input Current
Error Amplifier
Quiescent Operating Current
Soft Start, V
P-Channel Switch ON Resistance
Maximum Duty Cycle
SW Leakage Current
P-Channel Current Limit
PWM Frequency
PFM Mode Region
Feed Back PSRR
Closed Loop Load Regulation
Thermal Shutdown
UVLO
Note 1: V
Note 2: 1.0 amp operation @ 70°C ambient depends on adequate heat sinking to keep T
TM
IN
vs V
Parameter
Under Voltage Lockout
Under Voltage Lockout
UVLO Hysteresis
OUT
OUT
Slew Rate
1
ratio @ 1.0A LOAD IS SET AT V
2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Load Reg
I
Symbol
Q
F
R
E L E C T R I C A L C H A R A C T E R I S T I C S
VCC
OP-PWM
V
(Pin 4)
I
BW
DS(ON)
T
Vo
LEAK
I
I
D
LIM
Io
FBT
FB
SD
IN
Functional operation guaranteed by design
4.0V < VCC < 6.0V
V
Closed Loop
V
Initial Power On or after Short Circuit
I
I
V
VCC Rising
VCC Falling
Peak Current at Switch Pin (not DC current)
PWM Mode
PFM Mode Load Current Crossover
1Hz < Frequency VCC < 10KHz
V
(assured by design, not ATE tested)
= V
SW
SW
J
FB
O
FB
FB
< 125°C for VCC = VPWR = 5V (except where otherwise noted). Typical values are at T
Integrated Products Division
= 1.2V, 50mA < I
= 1.0A
= 1.0A (assured by design, not ATE tested)
= 0.825V
= 0.81V
> 0.825V, R
OUT
+ 1.0V
®
Microsemi
Test Conditions
LOAD
O
Switch Pin < 1KΩ
< 1.0A, ckt figure 1
VREF @ 800mV, 1.0A, 1.2MHz PWM
J
below 125°C
P
RODUCTION
1.50
Min
820
135
784
4.0
2.4
D
ATA SHEET
0.375
1200
Typ
0.01
0.15
2.30
0.85
800
200
500
100
150
-40
40
21
80
1920
Max
3.00
816
850
6.0
0.6
75
50
5
LX1912
Units
V/mS
%V
KHz
KHz
mV
mA
A
nA
μA
μA
dB
°C
%
V
Ω
V
A
=23°C.
O
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