Ordering number : ENA1964
Bi-CMOS IC
LV58761MX
Step-down Switching Regulator
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
• Small package: MFP8J (200mil) with heat sink
• High efficiency (88% IOUT = 1A, VIN = 12V, VO = 5V)
• Standby mode
• Over-current protection
• Thermal shutdown protection
• Reference voltage: 0.8V
• Inside frequency: 950kHz
• Soft start
• Wide input dynamic range (4.75 to 18V)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum input VIN voltage
VIN max
20
V
BOOT pin maximum voltage
VBT max
25
V
SW pin maximum voltage
VSW max
BOOT pin-SW pin maximum voltage
VBS-SW max
EN Maximum Voltage
VEN max
FB, COMP, SS pin maximum voltage
Vfs max
Allowable power dissipation
Pd max
VIN max
V
7
V
20
V
Mount on a specified board *1
7
V
1.25
W
Junction temperature
Tj max
150
°C
Operating temperature
Topr
-20 to 80
°C
Storage temperature
Tstg
-40 to 150
°C
*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
VIN pin voltage
VIN
4.75 to 18
BOOT pin voltage
VBT
-0.3 to 23
V
V
SW pin voltage
VSW
-0.4 to VIN
V
BOOT pin-SW pin voltage
VBS-SW
6.5
V
EN voltage
VEN
18
V
FB, COMP, SS pin voltage
VFSO
6
V
Electrical Characteristics at Ta = 25°C, VIN = 12V
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
IC current drain at standby
ICC1
EN=0V
60
80
μA
IC current drain in operation
ICC2
EN=5v, FB=1V
2.3
3.1
mA
Efficiency
Effcy
VIN=12V, IOUT=1A, Vo=5V, Design target *2
88
Reference voltage
Vref
VIN=4.75V to 28V
FB pin bias current
Iref
FB=0.8V
High-side ON resistance
RonH
BOOT=5V, IOUT=1A : *4
Oscillation frequency
fOSC
760
Oscillatory frequency when
fOSCS
-2%
%
0.8
+2%
V
20
200
nA
950
1140
kHz
255
340
425
kHz
VENH
0.9
1.8
2.7
V
EN low-threshold voltage
VENL
0.7
1.35
2.0
Maximum ON DUTY
D max
SW Peak Current limit 1
Icl1
VIN=12V, VOUT=1.2V, L=2.2μH
SW Peak Current limit 2
Icl2
VIN=12V, VOUT=3.3V, L=2.2μH
SW Peak Current limit 3
Icl3
VIN=12V, VOUT=5V, L=2.2μH
Thermal shutdown temperature
Ttsd
*Design guarantee *3
160
°C
Thermal shutdown temperature
Dtsd
*Design guarantee *3
40
°C
Soft start current
ISS
SS=0V
UVLO threshold voltage
VUVLO
VIN Rising
UVLO hysteresis
VHYS
Ω
0.25
short-circuit is protected
EN high-threshold voltage
80
3.1
V
%
5.7
A
2.8
5.4
A
2.5
5.1
A
hysteresis
3
5
7
μA
3.9
4.2
4.5
V
0.2
V
*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
8 SS
VIN 2
7 EN
SW 3
6 COMP
GND 4
5 FB
Top view
No.A1964-2/7
LV58761MX
Package Dimensions
unit : mm (typ)
3411
5.0
Allowable power dissipation, Pd max -- W
0.43
6.0
4.4
8
1
2
0.35
(0.6)
Pd max -- Ta
1.5
0.15
(1.5)
SIDE VIEW
1.7 MAX
1.27
1.25
1.2
0.9
0.7
0.6
0.3
0
-20
0
20
40
60
80
100
0.05
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
VIN
EN
2
7
High : ON
Low or OPEN : OFF
UVLO
+
FB
COMP
C3=560pF
SS
Slope
comp
+
-
PWM
comparator
Output
logic
PreDrive
0.25
3
SW
VOUT=3.3V
+ D1
-
5
VIN=12V
Internal
Regulator
Internal
Regulator
OSC
1MHz
VIN
+ Error
Amp
4
6
8
GND
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.
1
Pin name
BOOT
2
VIN
3
SW
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.
Power Switch pin.
Connect the output LC filter.
Connect the above capacitance between this pin and BOOT pin.
VIN
Short protection
circuit
BOOT
Output MOS
SW
4
GND
Ground pin.
5
FB
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.
VOUT = Vref × { 1 +
(R1 + R10)
}
R3
Vref = 0.8V
VIN
Internal Regulation line
Example: 3.3V output voltage
(See, Block Diagram and Application example)
VOUT = 0.8 × { 1 +
8
SS
(27k + 4.3k)
}
10k
=3.304V
Soft start pin.
Sets the soft start time by means of the built-in 5μA source
voltage and external soft start capacity. The soft start capacity
CSS can be set as follows:
SS
FB
VREF
0.8V
Tss
CSS = 5μA × Vref
Where, Tss is the soft start time and Vref is the reference
voltage.
Example:2.4ms soft start time achieved
2.4ms
CSS = 5μA × 0.8V = 0.015μF
6
COMP
Phase compensation pin.
Connects with the phase compensation external capacitance and
resistance of DC/DC converter close loop.
VIN
Internal Reguretion line
Short
protection
circuit
COMP
7
EN
Enable pin.
Converter enabled when set to the HIGH voltage and disabled
when GND or OPEN state.
VIN
EN
No.A1964-4/7
LV58761MX
Reference data (1)
ICC1 -- Ta
2.5
VIN = 12V
EN = 0V
IC current drain in operation, ICC2 -- mA
80
70
60
50
40
30
--40
--20
0
20
40
60
80
2.4
ICC2 -- Ta
VIN = 12V
EN = 3V
FB = 1V
2.3
2.2
2.1
2.0
--40
100
--20
Ambient temperature, Ta -- C
820
Vref -- Ta
50
VIN = 12V
45
FB pin bias current, Iref -- nA
Reference voltage, Vref -- mV
815
810
805
800
795
790
785
--20
0
20
40
60
80
100
120
80
100
80
100
80
100
80
100
40
35
30
25
20
15
10
--20
FOSC -- Ta
90
1020
1000
980
960
940
920
900
--20
0
20
40
60
0
20
40
60
Ambient temperature, Ta -- C
Maximum ON DUTY, D max -- %
Oscillation frequency, FOSC -- kHz
60
Iref -- Ta
0
--40
140
VIN = 12V
880
--40
80
100
D max -- Ta
VIN = 12V
85
80
75
--40
--20
0
20
40
60
Ambient temperature, Ta -- C
Ambient temperature, Ta -- C
Oscillation frequency during
short-circuit protection, FOSCS -- kHz
40
VIN = 12V
FB = 0.8V
Ambient temperature, Ta -- C
360
20
5
780
--40
1040
0
Ambient temperature, Ta -- C
FOSCS -- Ta
7.0
VIN = 12V
6.5
ISS -- Ta
VIN = 12V
SS = 0V
350
6.0
5.5
340
5.0
330
4.5
4.0
320
3.5
310
--40
--20
0
20
40
60
Ambient temperature, Ta -- C
80
100
3.0
--40
--20
0
20
40
60
Ambient temperature, Ta -- C
PS No.A1964-5/7
LV58761MX
Venh -- Ta
2.6
VIN = 12V
EN low-threshold voltage, Venl -- V
EN high-threshold voltage, Venh -- V
2.8
2.4
2.0
1.6
1.2
0.8
--40
--20
0
20
40
60
80
Venl -- Ta
VIN = 12V
2.2
1.8
1.4
1.0
0.6
--40
100
--20
Icl -- Ta
5.5
40
60
80
100
Output voltage, VOUT -- V
5.0
VOUT = 1.2V
4.5
3.3V
4.0
5.0V
3.5
3.0
2.5
--40
--20
0
20
40
60
80
4.0
3.0
2.0
1.0
0.0
0.0
100
1.0
Ambient temperature, Ta -- C
95
20
Current Limit
6.0
5.0
Current limit peak, Icl -- A
0
Ambient temperature, Ta -- C
Ambient temperature, Ta -- C
Efficiency -- Load current
VIN = 12V
2.0
3.0
4.0
1.5
2.0
Load current -- A
5.08
VOUT = 5V
Load Regulation
VIN = 12V VOUT = 5V
-30 C
90
Ta = 9
0
C
25 C
85
80
0.0
0.5
1.0
1.5
Output voltage, VOUT -- V
Efficiency -- %
5.04
5.00
Ta = 90 C
25 C
4.96
-30 C
4.92
4.88
0.0
Load current -- A
0.5
1.0
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]
CH3:Vout
[20mV/div]
CH4:ILoad
[0.5A/div]
•Load transient response ILoad = 0.5A ⇔ 1.5A [100μsec/div]
CH3:Vout
[20mV/div]
CH4:ILoad
[1.0A/div]
PS No.A1964-6/7
LV58761MX
•VIN start up waveform Rload = 6Ω [1msec/div]
•VIN stop waveform Rload = 6Ω [1msec/div]
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 VIN=12V or less is used, boot strap voltage shortage because of intermittent operation at a no load might happen,
and it not operate normally. The load of about 500Ω is put between VOUT-GND, and in that case, avoid and use an
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
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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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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 July, 2011. Specifications and information herein are subject
to change without notice.
PS No.A1964-7/7