LX8941 [MICROSEMI]
ADJUSTABLE LOW DROPOUT REGULATOR; 可调低压差稳压器
| 型号： | LX8941 |
| 厂家： | 
Microsemi |
| 描述： | ADJUSTABLE LOW DROPOUT REGULATOR |
| 文件： | 总3页 (文件大小：127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LIN DOC #: 8941
LX8941
A
D J U S T A B L E
L
O W
D
R O P O U T
R
E G U L A T O R
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
P R E L I M I N A R Y D A T A S H E E T
DESCRIPTION
KEY FEATURES
■ 2% Internally Trimmed Output
differential to maintain regulation. This
feature makes it ideal for some
processor applications that require 4V
operation from a 5V supply. In
addition, the LX8941 provides an on/off
switch that reduces the IC quiescent
current when activated, making it ideal
for battery operated applications.
The LX8941 is an adjustable, low
■ Output Current In Excess Of 1A
dropout regulator rated for more than
1A of output current. It can regulate
with as low as 0.8V headroom between
the input and output voltages, at 1A
output current, thus minimizing power
dissipation. In addition, it can be used
in applications where worst case
■ Input-Output Differential
Less Than 0.8V At 1A
p Reverse Battery Protection
p Short Circuit Protection
p Internal Thermal Overload Protection
p Available In 5-Lead Plastic TO-220 And
supplies require a low input-output
Surface-Mount TO-263
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
DROPOUT VOLTAGE VS. OUTPUT CURRENT
VS . TEMPERATURE
600
IN
OUT
5V
4V
LX8941
500
125°C
10µF
400
ON
OFF
25°C
ADJ
22µF
300
200
-40°C
100
0
100
500
1000
Output Current - (mA)
PACKAGE ORDER INFORMATION
Plastic TO-220
5-pin
Plastic TO-263
DD
5-pin
TA (°C)
P
0 to 70
LX8941CP
LX8941CDD
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX8941CDDT)
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 0.6 4/99
1
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8941
A
D J U S T A B L E
L
O W
D
R O P O U T
R
E G U L A T O R
P R E L I M I N A R Y D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS (Note 1)
PACKAGE PIN OUTS
Input Voltage (VIN) ....................................................................................................... 26V
Operating Junction Temperature
TAB IS GND
Plastic (P, DD Package) ........................................................................................ 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
ON/OFF
5
ADJ
GND
VO
1
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal.
VIN
P PACKAGE
(Top View)
THERMAL DATA
P PACKAGE:
TAB IS GND
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DD PACKAGE:
4.5°C/W
60°C/W
5
4
3
2
1
ON/OFF
ADJ
GND
VO
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
4.5°C/W
60°C/W
VIN
DD PACKAGE
(Top View)
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
BLOCK DIAGRAM
* Required if regulator is located far from power supply
filter.
INPUT VOLTAGE
VIN
1
C1*
0.1µF
VO
OUTPUT
VOLTAGE
2
4
C2
10µF
THERMAL
SHUTDOWN
ADJ
ON
OFF
ON/
OFF
ON/OFF
CIRCUIT
5
GND
3
LX8941
Copyright © 1999
Rev. 0.6 4/99
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8941
A
D J U S T A B L E
L
O W
D
R O P O U T
R
E G U L A T O R
P R E L I M I N A R Y D A T A S H E E T
RECOMMENDED OPERATING CONDITIONS
Recommended Operating Conditions
Parameter
Symbol
Units
Min.
Typ.
Max.
Input Voltage (Note 2)
Load Current (with adequate heatsinking)
Input Capacitor (VIN to GND)
VIN
3.8
5
26
1000
V
mA
µF
µF
0.1
10
Output Capacitor with ESR of 10Ω max., (VOUT to GND)
Note 2. VIN (MIN) = VOUT + 1.2∆V(MAX). See Dropout Voltage maximum limit.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperature of 0°C to +125°C for LX8941CP; VIN = 10V, IO = 1A, COUT
= 22µF, and are for DC characteristics only. (Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal
to the ambient temperature.)
LX8941
Typ.
Parameter
Symbol
Test Conditions
Units
Min.
Max.
1.225
1.25
1
10
1.275
50
50
V
mV
mV
ADJ Pin Voltage
VO
∆VOI
∆VOL
∆V
IO = 0A, TA = 25ºC
Line Regulation
Load Regulation
Dropout Voltage
VO + 2V ≤ VIN ≤ 26V, IO = 5mA
50mA ≤ IO ≤ 1A, VO = VADJ
IO = 100mA
150
275
400
3
300
500
800
15
mV
mV
mV
IO = 500mA
IO = 1A
QuiescentCurrent
IQ
I
O ≤ 5mA, 7 ≤ VIN ≤ 26V
mA
30
50
mA
IO = 500mA
IO = 1000mA
VIN = 10V, IO = 1A
VIN = 26V
115
2
1.2
150
20
180
20
mA
µA
A
Adjust Pin Current
IADJ
ICL
1
Current Limit
Output Noise Voltage (Note 3)
Long Term Stability (Note 3)
Ripple Rejection (Note 3)
VO RMS 10Hz - 100kHz, IO = 5mA
µVRMS
mV/1000hr
dB
RR fO = 120Hz, 1VRMS, IO = 100mA
66
Enable Logic Section
2
V
On Threshold Voltage
On Threshold Current
Off Threshold Voltage
Off Threshold Current
50
0.8
µA
V
-10
µA
Note 3. These parameters, although guaranteed, are not tested in production.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
Copyright © 1999
Rev. 0.6 4/99
3
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