SANYO LA5777

Ordering number : ENA0497A
Monolithic Linear IC
LA5777
Separately-excited Step-down
Switching Regulator (5V)
Overview
The LA5777 is a Separately-excited step-down switching regulator (5V).
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
Maximum Input voltage
VIN max
30
V
IO max
3
A
Maximum Output current
SW pin application reverse voltage
Allowable power dissipation
Conditions
Ratings
VSW
Pd max1
Infinitely large heat sink.
Pd max2
Independent IC.
Unit
-1
V
7.5
W
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
Input voltage range
Symbol
VIN
Conditions
Ratings
Unit
8 to 28
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 / N1306 MS PC 20060411-S00002 No.A0497-1/4
LA5777
Electrical Characteristics at Ta = 25°C, VO = 3.3V
Parameter
Symbol
Ratings
Conditions
min
Reference voltage
VIN = 15V, IO = 1.0A
η
VIN = 15V, IO = 1.0A
f
VIN = 15V, IO = 1.0A
128
160
192
kHz
fshort
VIN = 15V, VOS = 0V
15
30
45
kHz
40
100
mV
10
30
Switching frequency
4.80
max
VO
Efficiency
Switching frequency when
Unit
typ
5.00
5.20
V
84
%
short-circuit protection is active
Line regulation
∆VOLINE
VIN = 8 to 20V, IO = 1.0A
Load regulation
∆VOLOAD
VIN = 15V, IO = 0.5 to 1.5A
∆VO/∆Ta
Output voltage temperature
±0.5
Designed target value. *
mV
mV/°C
coefficient
Ripple attenuation factor
RREJ
f = 100 to 120Hz
Output leak current
IOleak
VIN = 15V, SWOUT = -0.4V
Current limiter operating voltage
IS
Operating current
45
VIN = 15V
IVIN
dB
µA
50
3.1
A
VIN = 15V
5.6
VIN = 15V, ENA = 5V
50
mA
100
µA
0.6
V
Standby current
ISTBY
ENA pin LOW voltage range
VENAL
ENA pin HIGH voltage range
VENAH
Thermal shutdown operating
TSD
Designed target value. *
165
°C
∆TSD
Designed target value. *
15
°C
2.4
VIN
V
temperature
Thermal shutdown Hysteresis
width
* Design target value: No measurement made.
Package Dimensions
unit : mm (typ)
3079A
Pd max -- Ta
4.5
2.7
10.4max
10.0
2.7
0.9
5
1
0.8
(1.6)
17.8
21.3
23.0
15.0
1.3
(8.8)
3.6
Allowable pwer dissipation, Pd max -- W
10.0
1.7
0.45
4.5
8.0
7.5
100×100×1.5mm3
6.0
5.6
50×50×1.5mm3
4.0
3.3
2.0
1.75
Al heat
sink plate
tightening
torque
39N.cm
With
silicone
grease
applied.
30×30×1.5mm3
No heat sink
0
--30
8.4
Infinitely large heat sink
θjc=5°C/W
0
20
40
60
80
100
120
Ambient temperature, Ta -- °C
140
160
PCA00833
SANYO : TO-220-5H
Pin Assignment
(1) VIN (2) SWOUT
(3) GND
(4) VOS
(5) ENA
No.A0497-2/4
LA5777
Block Diagram
VIN 1
2 SWOUT
Reg.
OCP
Reset
OSC
Drive
Comp.
THD
4 VOS
Amp.
VREF
5
3
ENA
GND
Application Circuit Example
L1
47µH
VIN
SWOUT
LA5777
D1
SBD
C1
470µF
50V
C2
390µF
VOS
ENA
GND
Note: ENA pin starts operation with LOW voltage input.
No.A0497-3/4
LA5777
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
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
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
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of March, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0497-4/4