SANYO LA5777MP

Ordering number : ENA0495A
Monolithic Linear IC
LA5777MP
Separately-excited Step-down
Switching Regulator (5V)
Overview
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
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 max
Mounted on a substrate.*
Unit
-1
V
3.9
W
Operating temperature
Topr
-30 to +125
°C
Storage temperature
Tstg
-40 to +150
°C
* Specified substrate : 76.1×114.3×1.6mm3 : Copper foil ratio 60% FR4
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
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consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
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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
Symbol
Ratings
Conditions
min
Reference voltage
Efficiency
Switching frequency
Switching frequency when
Unit
typ
4.80
max
VO
VIN = 15V, IO = 1.0A
η
VIN = 15V, IO = 1.0A
5.00
5.20
V
f
VIN = 15V, IO = 1.0A
128
160
192
kHz
fshort
VIN = 15V, VOS = 0V
15
30
45
kHz
40
100
mV
10
30
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 = -1V
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)
3275
Pd max - Ta
4.5
1.5
9.9
1.3
4.5
(8.8)
1.2
10.0
(1.6)
0.9
1.7
0.2
0.4
1
5
Allowable power dissipation, Pd max - W
4.5
2.7
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-30 -20
SANYO : SMP5
Specified sbstrate: 76.1×114.3×1.6mm3
Copper foil ratio 60% FR4
4.0
3.90
0
20
40
60
80
100
Ambient temperature, Ta - °C
120
140
160
MSG06072
Pin Assignment
(1) VIN (2) SWOUT
(3) GND
(4) VOS
(5) ENA
No.A0495-2/4
LA5777MP
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
LA5777MP
D1
SBD
C1
470µF
50V
C2
390µF
VOS
ENA
GND
Note: ENA pin starts operation with LOW voltage input.
No.A0495-3/4
LA5777MP
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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.
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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
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limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
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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