Ordering number : EN5920A
Monolithic Linear IC
LA7995M
Charge Pump Based DC-DC
Converter
Overview
The LA7995M is a DC-DC converter IC that produces a 30V level from a 5V VCC power supply. It is intended for
applications such as the tuner power supply on video boards for personal computers.
Previously, almost all DC-DC converters adopted a technique in which the back electromotive force from a coil was used
as the step-up method. However, that method had the problem that it was subject to high-frequency noise due to the sharp
pulses used. In contrast, this device adopts the charge pump method. In addition to reducing noise significantly, this
method only requires capacitors as external components, thus reducing external component costs.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Conditions
Ratings
Unit
VCC max
Allowable power dissipation
7
Ta ≤ 65°C *
Pd max
380
V
mW
Operating temperature
Topr
-10 to +65
°C
Storage temperature
Tstg
-55 to +150
°C
Note * : When mounted on a
144.3×76.1×1.6mm3
paper-phenol printed circuit board.
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
Operating supply voltage range
Conditions
Ratings
VCC op
Unit
VCC
5
V
4.75 to 5.25
V
Electrical Characteristics at Ta = 25°C
Parameter
Symbol
Ratings
Conditions
Unit
min
Current drain
typ
max
29
mA
V
IIN
Output voltage fluctuations
Output current
19
24
VOUT
Output voltage
IO = 1mA, VCC = 5V
IO = 1mA, VCC = 5V
29
30.7
32
1.0
1.5
ΔVOUT
IOUT
Oscillator frequency
f
IO = 1mA, VIN = 4.75 to 5.25V
VO = 29V
1.5
1.7
COSC = 150pF
35
50
V
mA
65
kHz
Note : The above characteristics measured using 0.33μF chip capacitors for capacitors C1, C2, and C3.
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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
products described or contained herein.
N1506 MS PC B8-3716 No.5920-1/5
