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Sanyo Semicon Device |
Ordering number : ENA0742
LA5774
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator
(Variable Type)
Overview
www.DataSheet4UT.choemLA5774 is a Separately-excited step-down switching regulator (variable type).
Functions
• Low-ESR capacitor with increased reliability applicable as the output smoothing capacitor.
• High efficiency.
• Four external parts.
• Time-base generator (160kHz) incorporated.
• Current limiter incorporated.
• Thermal shutdown circuit incorporated.
• Soft start circuit incorporated.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum Input voltage
Maximum Output current
SW pin application reverse voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VIN max
IO max
VSW
Pd max1
Pd max2
Topr
Tstg
Conditions
No heat sink
Infinite heat sink
Ratings
30
3
-1
1.75
7.5
-30 to +125
-40 to +150
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
4.5 to 28
Unit
V
A
V
W
W
°C
°C
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
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
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
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.
31407 MS PC B8-9090 No.A0742-1/5
LA5774
Electrical Characteristics at Ta = 25°C, VO = 3.3V
Parameter
Symbol
Conditions
Reference voltage
Efficiency
VOS
η
Switching frequency
f
Line regulation
Load regulation
Output voltage temperature
coefficient
Ripple attenuation factor
∆VOLINE
∆VOLOAD
∆VO/∆Ta
RREJ
Current limiter operating voltage
IS
Thermal shutdown operating
TSD
www.DataSheet4Ute.mcpoemrature
Thermal shutdown Hysteresis
∆TSD
width
* Design target value: No measurement made.
VIN = 15V, IO = 1.0A
VIN = 15V, IO = 1.0A
VIN = 15V, IO = 1.0A
VIN = 8 to 20V, IO = 1A
VIN = 15V, IO = 0.5 to 1.5A
Designed target value. *
f = 100 to 120Hz
VIN = 15V
Designed target value. *
Designed target value. *
min
1.235
128
3.1
Ratings
typ
1.26
78
160
40
10
±0.5
45
165
15
max
1.285
192
100
30
Unit
V
%
kHz
mV
mV
mV/°C
dB
A
°C
°C
Package Dimensions
unit : mm (typ)
3079C
10.4max
3.6 10.0
4.5
1.3
0.9 2.7
15
(1.6)
0.8 0.45
4.5
1.7 8.4
Pd max -- Ta
10.0
8.0 100×100×1.5mm3
7.5
Infinite heat sink θjc=5°C
6.0 50×50×1.5mm3
5.6
4.0 30×30×1.5mm3
3.3
2.0 No heat sink
1.75
Al heat
sink
mounting
torque
39N⋅cm
silicone
grease
applied
0
-30 -20
0 20 40 60 80 100 120 140 160
Ambient temperature, Ta -- °C MSG07021
SANYO : 220-5H
Pin Assignment
(1) VIN (2) SWOUT (3) GND (4) VOS (5) SS
No.A0742-2/5
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