lx1911 Microsemi Corporation, lx1911 Datasheet - Page 2

• Manufacturer Part Number: lx1911
• Description: 1.5a, 1.1mhz Pwm Step-down Regulator
• Manufacturer: Microsemi Corporation

Copyright © 2004
Rev. 1.1, 2006-05-15
VIN ANALOG
VIN PWR
Specifications apply over junction temperature of: 0
Input Voltage (IN) ..............................................................................................................-0.3V to 7.0V
SW to GND.............................................................................................................-0.3V to (V
V
SW Peak Current (Internally Limited) ....................................................................................... 1800mA
Operating Temperature Range.......................................................................................-40°C to +125°C
Storage Temperature Range, T
Maximum Junction Temperature.................................................................................................... 150°C
RoHS / Pb-free Package Peak Solder Reflow Temperature
(40 seconds maximum exposure) .......................................................................................260°C (+0,-5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Junction Temperature Calculation: T
The θ
above assume no ambient airflow.
† PCB Layout Dependent
Operating Range
Feed Back Threshold
FB Input Current
Error Amplifier
Quiescent Operating Current
Soft Start, Vout Slew Rate
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
LD
N
FB
GND
SW
THERMAL RESISTANCE
FB
AME
to GND..........................................................................................................................-0.3V to +2V
JA
Ground. Currents are positive into, negative out of specified terminal.
numbers are guidelines for the thermal performance of the device/pc-board system. All of the
Plastic Micro Lead 6-Pin
TM
Parameter
Unregulated supply voltage input, ranging from +4V to 6.0V for internal analog control circuitry.
Unregulated supply voltage input (+4V to 6.0V), high current path, connects to PMOS Source of PWM switch.
Feedback input for setting programming output voltage.
Circuit ground providing bias for IC operation and high frequency gate drive bias, can be connected to heatsink terminal.
Inductor and commutation diode connection point. Connects to internal PMOSFET source.
A B S O L U T E M A X I M U M R A T I N G S
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
A
-
...................................................................................... -65°C to 150°C
JUNCTION TO
T H E R M A L D A T A
J
= T
A
+ (P
Load Reg
I
Symbol
Q
R
F
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
V
OP-PWM
F U N C T I O N A L P I N D E S C R I P T I O N
(Pin 5)
DS(ON)
I
D
BW
V
T
I
Vo
LEAK
I
FBT
D
LIM
Io
FB
x θ
SD
IN
A
o
C < T
JA
MBIENT
).
J
Functional operation guaranteed by design
4.0V < V
V
Closed Loop
V
Initial Power On or after Short Circuit
I
I
V
Peak Current at Switch Pin (not dc current)
PWM Mode
PFM Mode
1hz < Frequency Vin < 10Khz
V
(assured by design, not ATE tested)
< 125
SW
SW
FB
FB
FB
O
Integrated Products Division
, θ
= 1.2V, 50mA < I
= 1.0A
= 1.0A (assured by design, not ATE tested)
= 0.825V
= 0.81V
> 0.825V, Rload Switch Pin < 1K ohms
o
JA
C for V
®
Microsemi
IN
< 6.0V
IN
Test Conditions
= 5V (except where otherwise noted). Typical values are at T
D
ESCRIPTION
O
< 1.2A, ckt figure 1
1.5A, 1.1MH
25-40°C/W
IN
+ 0.3V)
P
RODUCTION
†
Z
PWM Step-Down Regulator
GND
Min
SW
RoHS / Pb-free 100% Matte Tin Lead Finish
784
700
135
4.5
1.6
80
FB
Note: Heatsink pad on bottom should be
D
connected to ground or left floating.
ATA
P A C K A G E P I N O U T
1
2
3
LD P
S
1020
N.C. – No Connect
Typ
0.25
0.01
0.85
800
100
500
100
250
150
-40
1.9
ACKAGE
40
21
HEET
A
=23°C.
6
5
4
(Top View)
1400
Max
816
850
5.5
0.5
75
50
5
LX1911
N.C.
VIN ANALOG
VIN PWR
Units
V/mS
%V
KHz
Khz
mV
mA
nA
µA
µA
dB
°C
%
V
Ω
A
O
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