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MC7805CT

P1-P3P4-P6P7-P9
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2000
Rev. 1.2c, 2005-05-18
WWW.Microsemi .COM
LX8816
Dual Channel 1A Low Dropout Re
g
ulator
P
RODUCTION
D
ATA
S
HEET
TM
®
DESCRIPTION
The LX8816 is a dual channel
positive-voltage linear regulator. This
dual regulator has one fixed output
coupled with an adjustable output.
Each channel features low-dropout
and high accuracy.
The LX8816 provides designers
with a flexible power management
solution, minimal printed circuit board
area and shorter design cycles.
Each channel can supply up to one
amp independently with a regulator
design optimized for system efficiency
by consuming minimal ground current
and directing quiescent current to the
load.
The LX8816 features on-chip
trimming of the internal voltage
enabling precise output voltages,
typically ±1% of it’s specified value,
while the BiPolar output transistor has a
low dropout voltage even at full output
current (V
DO
< 1.2V typ. @ 1A).
Thermal and Short Circuit Current
Protection are integrated on-chip and
operate independently for each regulator
output.
The LX8816 regulator is stable with a
low-value output capacitor, typically
2.2µF on the outputs, allowing designers
flexibility in external component
selection.
Microsemi’s S-PAK package enables
maximum power dissipation and ease of
assembly using surface mount
technology.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Two Independent Regulated
Outputs
Accurate Output Voltages
Typical Dropout of 1.2V at 1A
and 1.1V at 500mA
Independent Thermal and
Current Limit Protection
Low Profile 5 Lead SMT Power
Package
Low Tolerance Load Regulation
Wide DC Supply Voltage of 4.3V
to 10V
Loop Stability Independent of
Output Capacitor Type
APPLICATIONS/BENEFITS
5V to 3.3V / ADJ Regulators
Hard Disk Drives, CD-ROMs
ADSL and Cable Modems
Battery Charging Circuits
Instrumentation
PC Peripherals
APPLICATION CIRCUITS
22µF
10µF
10 µF
V
IN
= 5V
3.3V @ 1.0A
2.5V* @ 1.0A
R1
499
R2
499
1
2
1
1*
1
RI
R
R
VV
ADJREF
+
⎜
⎜
⎝
⎛
⎟
⎠
⎞
+=
V
1
V
2
GND
ADJ
V
IN
LX8816-04
PACKAGE ORDER INFO
DF
Plastic S-PAK
5-PIN
T
J
(°C)
O
UTPUT
V
1
(PIN
4)
O
UTPUT
V
2
(PIN
5)
RoHS Compliant
Transition DC: 0515
0 to 125 Adj. 3.3V
LX8816-04CDF
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8816-04CDF-TR)
L
L
X
X
8
8
8
8
1
1
6
6
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2000
Rev. 1.2c, 2005-05-18
WWW.Microsemi .COM
LX8816
Dual Channel 1A Low Dropout Re
g
ulator
P
RODUCTION
D
ATA
S
HEET
TM
®
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
BAT
).................................................................................................. 13.5V
Load Current (Internally Limited)................................................................................... 1A
Power Dissipation ................................................................................... Internally Limited
Short-Circuit Protection........................................................................................Indefinite
Operating Junction Temperature................................................................................ 150°C
Storage Temperature Range........................................................................ -65°C to 150°C
Peak Package 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.
THERMAL DATA
DF
Plastic S-Pak 5-Pin
T
HERMAL
R
ESISTANCE
-J
UNCTION TO
T
AB
,
θ
JT
4.5°C/W
T
HERMAL
R
ESISTANCE
-J
UNCTION TO
A
MBIENT
,
θ
J
A
24.5°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x θ
JA
).
The θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow. θ
JA
can vary from 25°C/W to >
40°C/W depending on mounting technique. (See Application Notes Section: Thermal
considerations)
PACKAGE PIN OUT
1
2
3
4
5
V
2
V
1
GND
ADJ
V
IN
Tab is GND
DF
P
ACKAGE
(Top View)
RoHS 100% Matte Tin Lead Finish
FUNCTIONAL PIN DESCRIPTION
P
IN
N
AME
D
ESCRIPTION
V
IN
Positive unregulated supply input for the regulator. Bypass to GND with at least 2.2µF capacitance having low
ESR for good transient response.
ADJ
Adjustable Input
.
The output voltage can be set by two external resistors with the following relationship: V
1
= V
REF
* (1 + R1 / R2) + I
ADJ
* R1 where R1 is the resistor connected between V
1
and ADJ, and R2 is the resistor
connected between ADJ and GND.
GND
Common terminal for ground reference.
The input and output bypass capacitors should be connected to this
pin. In addition the tab on the S-Pak package and pin 3 are also used for heat sinking the device.
V
1
Adjustable regulator output (Regulator #1) It is recommended to bypass to GND with at least 2.2uF. Size your
output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR
capacitor will improve the response to these load steps.
V
2
Fixed regulator output (Regulator #2). It is recommended to bypass to GND with at least 2.2µF. Size your output
capacitor to meet the transient loading requirement. For dynamic loads, a lower ESR capacitor will improve the
response to these load steps.
P
P
A
A
C
C
K
K
A
A
G
G
E
E
D
D
A
A
T
T
A
A
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2000
Rev. 1.2c, 2005-05-18
WWW.Microsemi .COM
LX8816
Dual Channel 1A Low Dropout Re
g
ulator
P
RODUCTION
D
ATA
S
HEET
TM
®
RECOMMENDED OPERATING CONDITIONS
LX8816-04
Parameter Symbol
Min Typ Max
Units
Input Voltage V
IN
4.5 10 V
Output Voltage (adjustable) V
OUT
5.5 V
Load Current each output (with adequate heat sinking) 0 1000 mA
Input Capacitor (V
IN
to GND) 2.2 20 µF
Output Capacitor (V
OUT
to GND) 1.0 10* µF
*
Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value capacitor will
improve the response to these load steps.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C
≤
T
A
≤
125°C except where
otherwise noted and the following test conditions: V
IN
= 5V, I
OUT
= 10mA, C
1
= 10µF (Tantalum), C
2
= C
3
= 4.7µF (Tant.), & T
J
= T
A
using
low duty cycling methods.
LX8816-04
Parameter Symbol Test Conditions
Min Typ Max
Units
`
Adjustable Output (Output 1)
Reference Voltage V
REF
5mA < I
1
< 1A, 4.75V < V
IN
< 10V 1.225 1.25 1.273 V
Line Regulation
∆V
1
(V
IN
)
4.75V < V
IN
< 5.5V, I
OUT
= 5mA 1.5 2.5 mV
Line Regulation
∆V
1
(V
IN
)
4.50V < V
IN
< 10V, I
OUT
= 5mA 0.17 0.22 %V
Load Regulation
∆V
REF
(I
1
)
5mA < I
1
< 1A, V
IN
= 4.75V 0.04 0.15 %V
Dropout Voltage
∆V I
LOAD
= 1A, ∆V
1
= -2%
1.2 1.3 V
Current Limit I
OUT (MAX)
1.0 1.4 A
Minimum Load Current I
L
Note 1, The external resistor divider current can be
included in this requirement.
2 3 mA
Adjust Pin Bias Current I
ADJ
Bias current flows into part. 0.12 1
µA
`
Fixed Output (Output 2)
Output Voltage V
2
5mA < I
2
< 1A, 4.75V < V
IN
< 10V 3.234 3.30 3.3825 V
Line Regulation
∆V
2
(V
IN
)
4.75V < V
IN
< 5.5V, I
OUT
= 5mA 6 8 mV
Line Regulation
∆V
2
(V
IN
)
4.50V < V
IN
< 10V, I
OUT
= 5mA 0.17 0.22 %V
Load Regulation
∆V
2
(I
2
)
5mA < I
2
< 1A, V
IN
= 4.75V 2.6 6 mV
Dropout Voltage
∆V I
LOAD
= 1A, ∆V
2
= -2%
1.2 1.3 V
Current Limit I
OUT (MAX)
1.0 1.4 A
Minimum Load Current I
L
Note 1 0 mA
`
Entire Regulator
Quiescent Current I
Q
V
IN
< 10V, I
1
= 5mA, I
2
= 5mA 2.6 3.8 mA
Quiescent Current IQ V
IN
< 10V, I
1
= 1A, I
2
= 1A 3.5 6 mA
Ripple Rejection PSRR f=120Hz, V
IN
= 5V 60 75 dB
RMS Output Noise (% of V
OUT
) V
OUT (RMS)
10Hz < f < 10kHz 0.003 %V
Thermal Shutdown T
JSD
135 140
°C
Note 1: Minimum load current is defined as the amount of output current required to maintain regulation.
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P1-P3P4-P6P7-P9

MC7805CT

Mfr. #:
Buy MC7805CT
Manufacturer:
ON Semiconductor
Description:
Linear Voltage Regulators 5V 1A Positive
Lifecycle:
New from this manufacturer.
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