The LA5797MC is a charge pump step-up power supply for Variable capacitance diodes.
http://onsemi.com
Features
•
By using charge pump, no coils are necessary.
•
Time-base generator (140kHz) incorporated.
•
Thermal shutdown circuit incorporated.
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Junction temperature
Symbol
VIN max
Pd max
Topr
Tstg
Tjmax
Mounted on the specified board. *
Conditions
Ratings
30
0.75
-25 to +90
-40 to +150
150
Unit
V
W
°C
°C
°C
* Specified board: 114.3mm
×
76.1mm
×
1.6mm, glass epoxy board.
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions
at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
7.5 to 28
Unit
V
Semiconductor Components Industries, LLC, 2013
August, 2013
62012 SY 20120207-S00003 No.A2086-1/4
LA5797MC
Electrical Characteristics
at Ta
=
25°C
Parameter
Reference voltage
Switching frequency
Thermal shutdown operating
temperature
Thermal shutdown Hysteresis
width
* Design target value: No measurement made.
ΔTSD
Designed target value. *
15
°C
Symbol
VFB
f
TSD
Conditions
min
VIN = 15V, IO = 5mA
VIN = 7.5V to 28V
Designed target value. *
1.189
112
Ratings
typ
1.225
140
165
max
1.261
168
V
kHz
°C
Unit
Package Dimensions
unit : mm (typ)
3424
4.9
8
1.0
Pd max -- Ta
Specified board: 114.3×76.1×1.6mm
3
glass epoxy board.
Allowable power dissipation, Pd max -- W
0.375
0.8
0.75
3.9
6.0
0.835
0.6
1
1.27
2
0.42
1.75 MAX
0.2
0.4
0.36
0.2
0.175
0
-25
0
25
50
75
90 100
125
Ambient temperature, Ta --
°C
SANYO : SOIC8
Pin Assignment
VIN 1
EN 2
NC 3
NC 4
Top view
8 VRET
7 CPOUT
6 GND
5 FB
No.A2086-2/4
LA5797MC
Block Diagram
VRET
VIN
Reg.
EN
OSC
VREF
Amp.
DRIVE ON/OFF
CPOUT
DRIVE ON/OFF
NC
NC
TSD
FB
GND
Application Circuit Example
External circuit diagram (VCC = 24V)
VRET
VCC
24V
CPOUT
LA5797MC
EN
FB
GND
31-32V
No.A2086-3/4
LA5797MC
External circuit diagram (VCC = 15V)
VRET
VCC
15V
CPOUT
LA5797MC
EN
FB
GND
31-32V
Note : The IC is made active when the EN pin is pulled down to GND. The charge pump operation is stopped when
the EN pin is pulled up to VIN.
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at
www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no
warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental
damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical
experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use
as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in
which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for
any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors
harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or
death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the
part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PS No.A2086-4/4
Mouser Electronics
Authorized Distributor
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