LA5797MC - ON Semiconductor

Ordering number : ENA2086
LA5797MC
Monolithic Linear IC
Charge Pump Step-up Power Supply
for Variable Capacitance Diodes
http://onsemi.com
Overview
The LA5797MC 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
Symbol
Input voltage
VIN max
Allowable power dissipation
Pd max
Conditions
Ratings
Mounted on the specified board. *
Unit
30
V
0.75
W
Operating temperature
Topr
-25 to +90
°C
Storage temperature
Tstg
-40 to +150
°C
Junction temperature
Tjmax
150
°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
Semiconductor Components Industries, LLC, 2013
August, 2013
Conditions
Ratings
Unit
7.5 to 28
V
62012 SY 20120207-S00003 No.A2086-1/4
LA5797MC
Electrical Characteristics at Ta = 25°C
Parameter
Symbol
Ratings
Conditions
min
Reference voltage
VFB
Switching frequency
VIN = 15V, IO = 5mA
f
Thermal shutdown operating
VIN = 7.5V to 28V
Unit
typ
max
1.189
1.225
1.261
112
140
168
V
kHz
TSD
Designed target value. *
165
°C
ΔTSD
Designed target value. *
15
°C
temperature
Thermal shutdown Hysteresis
width
* Design target value: No measurement made.
Package Dimensions
unit : mm (typ)
3424
4.9
8
Allowable power dissipation, Pd max -- W
0.835
0.375
2
0.42
0.2
1.75 MAX
1.27
6.0
3.9
1
Pd max -- Ta
1.0
Specified board: 114.3×76.1×1.6mm3
glass epoxy board.
0.8
0.75
0.6
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
8 VRET
EN 2
7 CPOUT
NC 3
6 GND
NC 4
5 FB
Top view
No.A2086-2/4
LA5797MC
Block Diagram
VRET
VIN
Reg.
DRIVE ON/OFF
OSC
EN
VREF
CPOUT
Amp.
DRIVE ON/OFF
NC
FB
NC
TSD
GND
Application Circuit Example
External circuit diagram (VCC = 24V)
VRET
VCC
24V
CPOUT
LA5797MC
31-32V
EN
FB
GND
No.A2086-3/4
LA5797MC
External circuit diagram (VCC = 15V)
VRET
VCC
15V
CPOUT
LA5797MC
31-32V
EN
FB
GND
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.
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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
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PS No.A2086-4/4