LV58132MX 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 MFP8 (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 90μA at stand-by mode. It has over current protection for load devices. With
external capacitor, it achieves soft start.
Functions
•
2.0A 1ch step-down regulator
•
Small package: MFP8 (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: 370kHz
•
Soft start
•
Wide input dynamic range (4.75 to 18V)
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum input VIN voltage
BOOT pin maximum voltage
SW pin maximum voltage
BOOT pin-SW pin maximum voltage
EN Maximum Voltage
FB, COMP, SS pin maximum voltage
Allowable power dissipation
Junction temperature
Operating temperature
Storage temperature
Symbol
VIN max
VBT max
VSW max
VBS-SW max
VEN max
Vfs max
Pd max
Tj max
Topr
Tstg
Mount on a specified board *1
Conditions
Ratings
20
25
VIN max
7
20
7
2.05
150
-20 to 80
-40 to 150
Unit
V
V
V
V
V
V
W
°C
°C
°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.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
August, 2013
20911 SY 20110127-S00005 No.A1924-1/8
LV58132MX
Recommended Operating Conditions
at Ta = 25°C
Parameter
VIN pin voltage
BOOT pin voltage
SW pin voltage
BOOT pin-SW pin voltage
EN voltage
FB, COMP, SS pin voltage
VIN
VBT
VSW
VBS-SW
VEN
VFSO
Symbol
Conditions
Ratings
4.75 to 18
-0.3 to 23
-0.4 to VIN
6.5
18
6
Unit
V
V
V
V
V
V
Electrical Characteristics
at Ta
=
25°C, VIN = 12V
Parameter
IC current drain at standby
IC current drain in operation
Efficiency
Reference voltage
FB pin bias current
High-side ON resistance
Low-side ON resistance
Oscillation frequency
Oscillatory frequency when
short-circuit is protected
EN high-threshold voltage
EN low-threshold voltage
Maximum ON DUTY
SW Peak Current limit 1
SW Peak Current limit 2
SW Peak Current limit 3
Thermal shutdown temperature
Thermal shutdown temperature
hysteresis
Soft start current
ISS
SS=0V
3
5
7
μA
*2: Reference value (not tested IC unit)
*3: Design guarantee (value guaranteed by design and not tested IC unit)
VENH
VENL
D max
Icl1
Icl2
Icl3
Ttsd
Dtsd
VIN=12V, VOUT=1.2V, L=10μH, *3
VIN=12V, VOUT=3.3V, L=10μH, *3
VIN=12V, VOUT=5V, L=10μH, *3
*Design guarantee *3
*Design guarantee *3
2.9
2.6
2.3
160
40
0.9
0.7
1.8
1.35
85
5.5
5.2
4.9
2.7
2.0
V
V
%
A
A
A
°C
°C
Symbol
ICC1
ICC2
Effcy
Vref
Iref
RonH
RonL
fOSC
fOSCS
296
85
EN=0V
EN=5v, FB=1V
VIN=12V, IOUT=1A, Vo=5V, Design target *2
VIN=4.75V to 28V
FB=0.8V
BOOT=5V
-2%
Conditions
Ratings
min
typ
90
2
88
0.8
20
0.25
5
370
115
444
145
+2%
200
max
Unit
μA
mA
%
V
nA
Ω
Ω
kHz
kHz
Pin Assignment
BOOT 1
VIN 2
SW 3
GND 4
Top view
8 SS
7 EN
6 COMP
5 FB
No.A1924-2/8
LV58132MX
Package Dimensions
unit : mm (typ)
3372
TOP VIEW
5.0
8
SIDE VIEW
BOTTOM VIEW
(3.4)
2.5
Pd max -- Ta
Allowable power dissipation, Pd max -- W
2.0
2.05
0.43
(2.6)
4.4
6.0
1.5
1.15
1.0
1
(0.65)
2
0.35
1.27
SIDE VIEW
0.15
0.5
(1.5)
1.7 MAX
0
-20
0
20
40
60
80
100
Ambient temperature, Ta -- C
0.05
SANYO : MFP8(200mil)
Specified Board [IC, Small signal part side]
Specified Board [coil, Schottky part side]
Block Diagram and Sample Application Circuit
BOOT
VIN
EN
High : ON
Low or OPEN : OFF
1
2
VIN
VIN=12V
7
Internal
Regulator
UVLO
+
OSC
370kHz
Internal
Regulator
Pre-
Drive
0.25
PWM
comparator
Slope
comp
-
+ Error
Amp
-
+
-
Output
logic
3
SW
VOUT=3.3V
+
FB
5
Pre-
Drive
Short-through
protection
5
D1
COMP
C3=4700pF
6
4
GND
SS
8
Vref
0.8V
Pin-Short
protection
TSD
No.A1924-3/8
LV58132MX
Pin Function
Pin No.
1
Pin name
BOOT
Function
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.
Equivalent circuit
Short protection
circuit
VIN
BOOT
2
3
VIN
SW
Output MOS
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.
VOUT = Vref
×
{ 1 +
(R1 + R10)
}
R3
Vref = 0.8V
Example: 3.3V output voltage
(See, Block Diagram and Application example)
VOUT = 0.8
×
{ 1 +
(27k + 4.3k)
}
10k
VIN
Internal Regulation line
8
SS
=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:
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
SS
VREF
0.8V
FB
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
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