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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： | 2/7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 2
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
ABSOLUTE MAXIMUM RATINGS
Input Voltage (IN) .............................................................................................................. -0.3V to 7.0V
SW to GND.............................................................................................................-0.3V to (VIN + 0.3V)
VFB to GND..........................................................................................................................-0.3V to +2V
SW Peak Current (Internally Limited) ....................................................................................... 1800mA
Operating Temperature Range.......................................................................................-40
°C to +125°C
Storage Temperature Range, TA...................................................................................... -65°C to 150°C
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
Ground. Currents are positive into, negative out of specified terminal.
TH ERMAL DATA
LD Plastic Micro Lead 6-Pin
THERMAL RESISTANCE
-JUNCTION TO AMBIENT,
θ
JA
25-40
°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The
θ
JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the
above assume no ambient airflow.
PCB Layout Dependent
PACKAGE PIN OUT
FB
SW
N.C.
1
2
3
4
5
6
GND
VIN ANALOG
VIN PWR
LD PACKAGE (Top View)
Note: Heatsink pad on bottom should be
connected to ground or left floating.
N.C. – No Connect
RoHS / Pb-free 100% Matte Tin Lead Finish
FUNCTIONAL PIN DESCRIPTION
NAME
DESCRIPTION
VIN ANALOG
Unregulated supply voltage input, ranging from +4V to 6.0V for internal analog control circuitry.
VIN PWR
Unregulated supply voltage input (+4V to 6.0V), high current path, connects to PMOS Source of PWM switch.
FB
Feedback input for setting programming output voltage.
GND
Circuit ground providing bias for IC operation and high frequency gate drive bias, can be connected to heatsink terminal.
SW
Inductor and commutation diode connection point. Connects to internal PMOSFET source.
ELECTRICAL CHA RACTERISTICS
Specifications apply over junction temperature of: 0
oC < T
J < 125
oC for V
IN = 5V (except where otherwise noted). Typical values are at TA=23°C.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Operating Range
VIN
Functional operation guaranteed by design
4.5
5.5
V
Feed Back Threshold
VFBT
4.0V < VIN < 6.0V
784
800
816
mV
FB Input Current
IFB
VFB = 0.81V
40
75
nA
Error Amplifier
BW
Closed Loop
100
Khz
Quiescent Operating Current
IQ (Pin 5)
VFB > 0.825V, Rload Switch Pin < 1K ohms
500
850
A
Soft Start, Vout Slew Rate
Vo
Initial Power On or after Short Circuit
21
50
V/mS
P-Channel Switch ON Resistance
RDS(ON)
ISW = 1.0A
0.25
0.5
Ω
Maximum Duty Cycle
D
ISW = 1.0A (assured by design, not ATE tested)
80
100
%
SW Leakage Current
ILEAK
VFB = 0.825V
0.01
5
A
P-Channel Current Limit
ILIM
Peak Current at Switch Pin (not dc current)
1.6
1.9
A
PWM Frequency
FOP-PWM
PWM Mode
700
1020
1400
KHz
PFM Mode Region
Io
PFM Mode
250
mA
Feed Back PSRR
1hz < Frequency Vin < 10Khz
-40
dB
Closed Loop Load Regulation
Load Reg
VO = 1.2V, 50mA < IO < 1.2A, ckt figure 1
0.85
%VO
Thermal Shutdown
TSD
(assured by design, not ATE tested)
135
150
°C
EE
LL
EE
CC
TT
RR
IICC
AA
LL
SS
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