
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
'sproductsor
equipment.
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
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
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customer shall be solely responsible for the use.
42507 MS PC 20070410-S00004 No.A0795-1/4
LA5779N
Overview
The LA5779N is a Separately-excited step-down switching regulator (variable type).
Functions
High efficiency.
Six external parts.
Time-base generator (160kHz) incorporated.
Current limiter incorporated.
Thermal shutdown circuit incorporated.
ON/OFF function.
Specifications
Absolute
Maximum Ratings at Ta = 25
°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum Input voltage
VIN max
30
V
Maximum Output current
IO max
3
A
SW pin application reverse voltage
VSW
-1
V
Pd max1
Infinitely large heat sink.
7.5
W
Allowable power dissipation
Pd max2
No heat sink.
1.75
W
Operating temperature
Topr
-30 to +125
°C
Storage temperature
Tstg
-40 to +150
°C
Recommended Operating Conditions at Ta = 25
°C
Parameter
Symbol
Conditions
Ratings
Unit
Input voltage range
VIN
4.5 to 28
V
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator
(Variable Type)
Ordering number : ENA0795