Ordering number : ENA0852A
Monolithic Linear IC
LA5797M
Overview
For Variable Capacitance Diodes
Charge Pump Step-up Power Supply
The LA5797M is a charge pump step-up power supply for Variable capacitance diodes.
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
Symbol
VIN
Pd max
Topr
Tstg
Mounted on the specified board. *
Conditions
Ratings
30
0.91
-25 to +90
-40 to +150
Unit
V
W
°C
°C
* Specified board: 114.3mm
×
76.1mm
×
1.6mm, glass epoxy board.
Recommended Operating Conditions
at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
7.5 to 28
Unit
V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
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Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
s products or
equipment.
82207 MS 20070727-S00003 / 62707 MS PC No.A0852-1/4
LA5797M
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.
∆TSD
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)
3032D
1.0
Pd max -- Ta
Specified board: 114.3×76.1×1.6mm
3
glass epoxy board.
5.0
8
5
Allowable power dissipation, Pd max -- W
0.8
0.6
4.4
6.4
0.63
0.44
0.4
1
(0.65)
1.27
4
0.35
0.15
0.2
(1.5)
1.7max
0
-25
0
25
50
75
90 100
125
Ambient temperature, Ta --
°C
0.1
SANYO : MFP8(225mil)
Pin Assignment
VIN 1
EN 2
NC 3
NC 4
Top view
8 VRET
7 CPOUT
6 GND
5 FB
No.A0852-2/4
LA5797M
Block Diagram
VRET
VIN
Reg.
EN
OSC
VREF
Amp.
DRIVE ON/OFF
CPOUT
DRIVE ON/OFF
FB
TSD
GND
Application Circuit Example
External circuit diagram (VCC = 24V)
VRET
VCC
24V
CPOUT
LA5797M
EN
FB
GND
31-32V
External circuit diagram (VCC = 15V)
VRET
VCC
15V
CPOUT
LA5797M
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.
No.A0852-3/4
LA5797M
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
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Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
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above.
This catalog provides information as of August, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0852-4/4
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