Ordering number : ENA0495A
Monolithic Linear IC
LA5777MP
Overview
Separately-excited Step-down
Switching Regulator (5V)
The LA5777MP 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
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 max
Topr
Tstg
Mounted on a substrate.*
Conditions
Ratings
30
3
-1
3.9
-30 to +125
-40 to +150
Unit
V
A
V
W
°C
°C
* Specified substrate : 76.1×114.3×1.6mm
3
: Copper foil ratio 60％ FR4
Recommended Operating Conditions
at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
8 to 28
Unit
V
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"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
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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 20060420-S00004 No.A0495-1/4
LA5777MP
Electrical Characteristics
at Ta
=
25°C, VO = 3.3V
Parameter
Reference voltage
Efficiency
Switching frequency
Switching frequency when
short-circuit protection is active
Line regulation
Load regulation
Output voltage temperature
coefficient
Ripple attenuation factor
Output leak current
Current limiter operating voltage
Operating current
Standby current
ENA pin LOW voltage range
ENA pin HIGH voltage range
Thermal shutdown operating
temperature
Thermal shutdown Hysteresis
width
* Design target value: No measurement made.
∆TSD
Designed target value. *
15
°C
RREJ
IOleak
IS
IVIN
ISTBY
VENAL
VENAH
TSD
Designed target value. *
2.4
165
f = 100 to 120Hz
VIN = 15V, SWOUT = -1V
VIN = 15V
VIN = 15V
VIN = 15V, ENA = 5V
3.1
5.6
50
100
0.6
VIN
45
50
dB
µA
A
mA
µA
V
V
°C
∆V
OLINE
∆V
OLOAD
∆V
O/∆Ta
VIN = 8 to 20V, IO = 1.0A
VIN = 15V, IO = 0.5 to 1.5A
Designed target value. *
40
10
±0.5
100
30
mV
mV
mV/°C
Symbol
VO
η
f
fshort
Conditions
min
VIN = 15V, IO = 1.0A
VIN = 15V, IO = 1.0A
VIN = 15V, IO = 1.0A
VIN = 15V, VOS = 0V
128
15
4.80
Ratings
typ
5.00
84
160
30
192
45
max
5.20
V
%
kHz
kHz
Unit
Package Dimensions
unit : mm (typ)
3275
4.5
Pd max - Ta
1.2
10.0
4.5
1.3
Allowable power dissipation, Pd max - W
4.0
3.90
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-30 -20
Specified sbstrate: 76.1×114.3×1.6mm
3
Copper foil ratio 60% FR4
(8.8)
9.9
(1.6)
1.7
0.9
0.4
4.5
1.5
0.2
2.7
1
5
SANYO : SMP5
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta -
°C
MSG06072
Pin Assignment
(1) VIN (2) SWOUT
(3) GND
(4) VOS
(5) ENA
No.A0495-2/4
LA5777MP
Block Diagram
VIN 1
Reg.
OCP
2 SWOUT
OSC
Reset
Drive
Comp.
THD
4 VOS
VREF
Amp.
5
ENA
3
GND
Application Circuit Example
L1
47µH
VIN
SWOUT
LA5777MP
C1
470µF
50V
D1
SBD
C2
390µF
VOS
ENA
GND
Note: ENA pin starts operation with LOW voltage input.
No.A0495-3/4
LA5777MP
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
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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
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Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
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This catalog provides information as of March, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0495-4/4
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