LV58761MX [SANYO]
Step-down Switching Regulator; 降压型开关稳压器
| 型号： | LV58761MX |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Step-down Switching Regulator |
| 文件： | 总7页 (文件大小：636K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA1964
Bi-CMOS IC
Step-down Switching Regulator
LV58761MX
Overview
LV58761MX is a 1ch step-down switching regulator. With built-in 0.25Ω power MOSFET switch, it achieves high output
current and high efficiency. With low-heat resistance, miniature package MFP8J (200mil) with heat-sink is adopted. Since
it is Current mode control type, it has good load current response, and phase compensation is easy. With ON/OFF pin,
operating can be less than 60μA at stand-by mode. It has cycle-by-cycle over current protection for load devices. With
external capacitor, it achieves soft start.
Functions
• 1.5A 1ch step-down regulator
• Thermal shutdown protection
• Reference voltage: 0.8V
• Inside frequency: 950kHz
• Soft start
• Small package: MFP8J (200mil) with heat sink
• High efficiency (88% I
• Standby mode
= 1A, V = 12V, V = 5V)
OUT
IN
O
• Over-current protection
• Wide input dynamic range (4.75 to 18V)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum input V voltage
IN
V
V
V
V
V
V
max
max
max
20
25
IN
BOOT pin maximum voltage
SW pin maximum voltage
BOOT pin-SW pin maximum voltage
EN Maximum Voltage
V
V
BT
V
max
7
SW
IN
max
V
BS-SW
max
EN
20
V
FB, COMP, SS pin maximum voltage
Allowable power dissipation
Junction temperature
max
fs
7
V
Pd max
Tj max
Topr
Mount on a specified board *1
1.25
150
W
°C
°C
°C
Operating temperature
-20 to 80
Storage temperature
Tstg
-40 to 150
*1: 46.4mm х 31.8mm х 1.7mm Four layers glass epoxy substrate.
Note: Plan the maximum voltage while including coil and surge voltages, so that the maximum voltage is not exceeded even for an instant.
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.
70611 SY 20110606-S00003 No.A1964-1/7
LV58761MX
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
V
pin voltage
V
V
V
V
V
V
4.75 to 18
-0.3 to 23
IN
IN
BOOT pin voltage
SW pin voltage
V
BT
-0.4 to V
IN
V
SW
BOOT pin-SW pin voltage
EN voltage
6.5
18
6
V
BS-SW
EN
V
FB, COMP, SS pin voltage
V
FSO
Electrical Characteristics at Ta = 25°C, V = 12V
IN
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
80
IC current drain at standby
IC current drain in operation
Efficiency
I
I
1
2
EN=0V
60
μA
mA
%
CC
EN=5v, FB=1V
2.3
88
3.1
CC
Effcy
Vref
V
=12V, I
=1A, Vo=5V, Design target *2
IN
IN
OUT
Reference voltage
V
=4.75V to 28V
-2%
0.8
+2%
200
V
FB pin bias current
Iref
FB=0.8V
20
nA
Ω
High-side ON resistance
Oscillation frequency
RonH
BOOT=5V, I
=1A : *4
0.25
950
340
OUT
f
760
255
1140
425
kHz
kHz
OSC
Oscillatory frequency when
short-circuit is protected
EN high-threshold voltage
f
OSCS
V
V
H
L
0.9
0.7
1.8
1.35
80
2.7
2.0
V
V
EN
EN low-threshold voltage
Maximum ON DUTY
EN
D max
Icl1
%
A
SW Peak Current limit 1
SW Peak Current limit 2
SW Peak Current limit 3
Thermal shutdown temperature
V
V
V
=12V, V
=12V, V
=12V, V
=1.2V, L=2.2μH
=3.3V, L=2.2μH
=5V, L=2.2μH
3.1
2.8
2.5
5.7
5.4
5.1
IN
IN
IN
OUT
OUT
OUT
Icl2
A
Icl3
A
Ttsd
Dtsd
*Design guarantee *3
*Design guarantee *3
160
40
°C
°C
Thermal shutdown temperature
hysteresis
Soft start current
I
SS=0V
3
5
4.2
0.2
7
μA
V
SS
UVLO threshold voltage
UVLO hysteresis
V
V
V
Rising
3.9
4.5
UVLO
IN
V
HYS
*2: Reference value (not tested IC unit)
*3: Design guarantee (value guaranteed by design and not tested IC unit)
*4: Value in state of substrate mounting.
Pin Assignment
BOOT
1
2
3
4
8
7
6
5
SS
V
EN
IN
SW
COMP
FB
GND
Top view
No.A1964-2/7
LV58761MX
Package Dimensions
unit : mm (typ)
3411
Pd max -- Ta
1.5
1.2
0.9
0.6
0.3
5.0
8
1.25
0.7
1
2
0.35
0.15
(0.6)
1.27
SIDE VIEW
0
-20
0
20
40
60
80
100
Ambient temperature, Ta --
C
SANYO : MFP8J(200mil)
Specified Board [IC，Small signal part side]
Specified Board [coil，Schottky part side]
Block Diagram and Sample Application Circuit
BOOT
1
V
V
=12V
IN
IN
V
2
IN
EN
7
Internal
High : ON
Regulator
Internal
Low or OPEN : OFF
UVLO
Regulator
Pre-
Drive
0.25
+
-
PWM
comparator
Output
logic
V
=3.3V
SW
OUT
3
OSC
1MHz
Slope
comp
+
-
+
D1
FB
-
5
Error
Amp
+
4
COMP
SS
GND
6
8
C3=560pF
Pin-Short
protection
Vref
0.8V
TSD
L1:NR5040T 2R2N[TAIYO YUDEN]
C2:GRM31CB31E106KA75[MURATA]
C5,C9:C2012JBOJ106M[TDK]
C :Ceramic Capacitor
No.A1964-3/7
LV58761MX
Pin Function
Pin No.
Pin name
Function
Equivalent circuit
Upper MOS transistor boot strap capacitance connection pin.
Connect the boot capacitance of about 0.022uF between SW
pins. To protect the SW pin’s absolute maximum rating , to ensure
stable
operation, and to eliminate noise , the boot capacitance serial
resistance (about 100Ω) Rb proves effective.
Input Voltage Pin. Connect substantially large (10uF more)
capacitance between this pin and GND.
1
BOOT
V
IN
Short protection
circuit
BOOT
2
3
V
IN
Power Switch pin.
Connect the output LC filter.
Connect the above capacitance between this pin and BOOT pin.
Output MOS
SW
SW
4
5
GND
FB
Ground pin.
Feedback pin.
Set the output voltage by means of split resistor in the section of
the output voltage
VOUT-FB-GND. VOUT setting is made as calculated below.
(R1 + R10)
V
= Vref × { 1 +
}
OUT
R3
V
IN
Vref = 0.8V
Internal Regulation line
Example: 3.3V output voltage
(See, Block Diagram and Application example)
(27k + 4.3k)
V
= 0.8 × { 1 +
}
OUT
10k
=3.304V
Soft start pin.
8
SS
Sets the soft start time by means of the built-in 5μA source
voltage and external soft start capacity. The soft start capacity
SS
FB
C
can be set as follows:
SS
SS
VREF
0.8V
Tss
Vref
C
= 5μA ×
Where, Tss is the soft start time and Vref is the reference
voltage.
Example:2.4ms soft start time achieved
2.4ms
C
= 5μA ×
= 0.015μF
0.8V
SS
Phase compensation pin.
Connects with the phase compensation external capacitance and
resistance of DC/DC converter close loop.
6
COMP
V
IN
Internal Reguretion line
Short
protection
circuit
COMP
Enable pin.
7
EN
V
Converter enabled when set to the HIGH voltage and disabled
when GND or OPEN state.
IN
EN
No.A1964-4/7
LV58761MX
Reference data (1)
I
1 -- Ta
I
2 -- Ta
CC
CC
2.5
2.4
80
V
= 12V
V
= 12V
IN
IN
EN = 0V
EN = 3V
FB = 1V
70
60
50
2.3
2.2
40
30
2.1
2.0
--40
--20
0
20
40
60
80
100
--40
--20
0
20
40
60
80
80
80
80
100
100
100
100
Ambient temperature, Ta --
C
Ambient temperature, Ta --
C
Vref -- Ta
Iref -- Ta
820
815
810
805
800
795
790
50
45
V
V
V
= 12V
V
= 12V
IN
IN
IN
IN
FB = 0.8V
40
35
30
25
20
15
10
785
780
5
0
--40
--20
0
20
40
60
80
100
120
140
100
100
--40
--20
0
20
40
60
Ambient temperature, Ta --
C
Ambient temperature, Ta -- C
F
-- Ta
D max -- Ta
OSC
1040
1020
1000
980
90
85
= 12V
V
= 12V
IN
960
940
920
80
75
900
880
--40
--20
0
20
40
60
80
--40
--20
0
20
40
60
Ambient temperature, Ta --
C
Ambient temperature, Ta --
C
F
-- Ta
I
-- Ta
OSCS
SS
360
350
340
330
7.0
6.5
V
= 12V
= 12V
IN
SS = 0V
6.0
5.5
5.0
4.5
4.0
320
310
3.5
3.0
--40
--20
0
20
40
60
80
--40
--20
0
20
40
60
Ambient temperature, Ta --
C
Ambient temperature, Ta -- C
PS No.A1964-5/7
LV58761MX
Venh -- Ta
Venl -- Ta
2.8
2.4
2.6
2.2
V
= 12V
V
= 12V
IN
IN
2.0
1.6
1.8
1.4
1.2
0.8
1.0
0.6
--40
--20
0
20
40
60
80
100
--40
--20
0
20
40
60
80
100
4.0
2.0
Ambient temperature, Ta --
C
Ambient temperature, Ta --
C
Icl -- Ta
Current Limit
5.5
5.0
4.5
4.0
3.5
6.0
5.0
4.0
3.0
2.0
V
= 1.2V
OUT
3.3V
5.0V
3.0
2.5
1.0
0.0
--40
--20
0
20
40
60
80
100
0.0
1.0
2.0
3.0
Ambient temperature, Ta --
C
Load current -- A
Efficiency -- Load current
Load Regulation
95
90
85
80
5.08
5.04
V
= 12V
V
= 5V
V
= 12V
V
= 5V
OUT
IN
OUT
IN
5.00
4.96
C
Ta = 90
-30 C
4.92
4.88
0.0
0.5
1.0
1.5
0.0
0.5
1.0
1.5
Load current -- A
Load current -- A
Reference data (2)
(* measurement circuit is shown in “Block Diagram and Sample Application circuit”)
•Output voltage lipple ILoad=0.5A [1.0usec/div]
•Load transient response ILoad = 0.5A ⇔ 1.5A [100μsec/div]
CH3:Vout
[20mV/div]
CH3:Vout
[20mV/div]
CH4:ILoad
[1.0A/div]
CH4:ILoad
[0.5A/div]
PS No.A1964-6/7
LV58761MX
•V start up waveform Rload = 6Ω [1msec/div]
IN
•V stop waveform Rload = 6Ω [1msec/div]
IN
CH1:VIN
[10V/div]
CH1:VIN
[10V/div]
CH2:SS
[1.0V/div]
CH2:SS
[1.0V/div]
CH3:Vout
[2.0V/div]
CH3:Vout
[2.0V/div]
•EN start up waveform Rload = 6Ω [1msec/div]
•EN stop waveform Rload = 6Ω [1msec/div]
CH1:EN
[5/div]
CH1:EN
[5V/div]
CH2:SS
[1.0V/div]
CH2:SS
[1.0V/div]
CH3:Vout
[2.0V/div]
CH3:Vout
[2.0V/div]
Considerations for the design
• When V =12V or less is used, boot strap voltage shortage because of intermittent operation at a no load might happen,
IN
and it not operate normally. The load of about 500Ω is put between V
-GND, and in that case, avoid and use an
OUT
intermittent mode.
• Insertion of serial beads in the Schottky diode for removal of noise may cause generation of the negative voltage
deviating from the absolute maximum rating at the SW pin, resulting in failure of normal operation. In such an event, do
not insert beads as above described and, instead, remove noise by means of the BOOT resistance Rb
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 July, 2011. Specifications and information herein are subject
to change without notice.
PS No.A1964-7/7
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