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Ordering number : ENA1857
Bi-CMOS IC
LV5876MX Step-down Switching Regulator
Overview
LV5876MX 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 cycle-by-cycle 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: 950kHz
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
Symbol
VIN max
VBT max
VSW max
VBS-SW max
VEN max
Vfs max
Pd max
Conditions
Mount on a specified board *1
Ratings
20
25
VIN max
7
20
7
2.05
Junction temperature
Tj max
150
Operating temperature
Topr
-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.
Unit
V
V
V
V
V
V
W
°C
°C
°C
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.
O2010 SY 20101006-S00008 No.A1857-1/7
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LV5876MX
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
Symbol
VIN
VBT
VSW
VBS-SW
VEN
VFSO
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
Symbol
Conditions
IC current drain at standby
IC current drain in operation
Efficiency
Reference voltage
FB pin bias current
ICC1
ICC2
Effcy
Vref
Iref
EN=0V
EN=5v, FB=1V
VIN=12V, IOUT=1A, Vo=5V, Design target *2
VIN=4.75V to 28V
FB=0.8V
High-side ON resistance
Low-side ON resistance
RonH
RonL
BOOT=5V, IOUT=1A
Oscillation frequency
Oscillatory frequency when
short-circuit is protected
EN high-threshold voltage
EN low-threshold voltage
Maximum ON DUTY
fOSC
fOSCS
VENH
VENL
D max
SW Peak Current limit 1
SW Peak Current limit 2
SW Peak Current limit 3
Thermal shutdown temperature
Icl1
Icl2
Icl3
Ttsd
VIN=12V, VOUT=1.2V, L=2.2μH
VIN=12V, VOUT=3.3V, L=2.2μH
VIN=12V, VOUT=5V, L=2.2μH
*Design guarantee *3
Thermal shutdown temperature
hysteresis
Dtsd
*Design guarantee *3
Soft start current
ISS SS=0V
UVLO threshold voltage
VUVLO
VIN Rising
UVLO hysteresis
VHYS
*2: Reference value (not tested IC unit)
*3: Design guarantee (value guaranteed by design and not tested IC unit)
min
-2%
760
255
Ratings
typ
90
2.3
88
0.8
20
0.25
5
950
340
0.9 1.8
0.7 1.35
80
3.1
2.8
2.5
160
40
35
3.9 4.2
0.2
max
+2%
200
1140
425
Unit
μA
mA
%
V
nA
Ω
Ω
kHz
kHz
2.7 V
2.0 V
%
5.7 A
5.4 A
5.1 A
°C
°C
7 μA
4.5 V
V
Pin Assignment
BOOT 1
8 SS
VIN 2
SW 3
7 EN
6 COMP
GND 4
5 FB
Top view
No.A1857-2/7
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Package Dimensions
unit : mm (typ)
3372
LV5876MX
TOP VIEW
5.0
8
SIDE VIEW
BOTTOM VIEW
(3.4)
2.5
2.0
Pd max -- Ta
2.05
1
(0.65)
2
0.35
1.27
SIDE VIEW
0.15
SANYO : MFP8(200mil)
1.5
1.15
1.0
0.5
0-20 0
20 40 60 80 100
Ambient temperature, Ta -- C
Specified Board [ICSmall signal part side]
Specified Board [coilSchottky part side]
Block Diagram and Sample Application Circuit
EN
High : ON
Low or OPEN : OFF
7
FB 5
COMP 6
C3=560pF
SS 8
BOOT
1
VIN
Internal
Regulator
UVLO
Internal
Regulator
OSC
1MHz
Slope
comp
+ PWM
comparator
-
+
+-
Output
logic
Pre-
Drive
-
+
Error
Amp
Short-through
protection
Pre-
Drive
2 VIN
VIN=12V
0.25
3 SW
6 D1
VOUT=3.3V
4 GND
Vref
0.8V
TSD
Pin-Short
protection
L1:NR5040T 2R2N[TAIYO YUDEN]
D1:SBM30-03[SANYO]
C2:GRM31CB31E106KA75[MURATA]
C5,C9:C2012JBOJ106M[TDK]
C :Ceramic Capacitor
No.A1857-3/7
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LV5876MX
Pin Function
Pin No. Pin name
1 BOOT
2 VIN
3 SW
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 100) 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
Output MOS
SW
4 GND
5 FB
8 SS
6 COMP
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)
VIN
VOUT
=
0.8
×
{
1
+
(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:
CSS
=
5μA
×
Tss
Vref
SS
Where, Tss is the soft start time and Vref is the reference
voltage.
Example:2.4ms soft start time achieved
CSS
=
5μA
×
2.4ms
0.8V
=
0.015μF
Phase compensation pin.
Connects with the phase compensation external capacitance and
resistance of DC/DC converter close loop.
VIN
Internal Regulation line
VREF
0.8V
Internal Reguretion line
FB
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.A1857-4/7
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Reference data (1)
110
VIN = 12V
105 EN = 0V
100
ICC1 -- Ta
LV5876MX
2.5
VIN = 12V
EN = 3V
FB = 1V
2.4
ICC2 -- Ta
95 2.3
90
85 2.2
80
75
70
--40
--20
0
20 40 60 80 100
Ambient temperature, Ta -- °C
Vref -- Ta
820
VIN = 12V
815
810
805
800
795
790
785
780
--40 --20 0 20 40 60 80 100
Ambient temperature, Ta -- °C
FOSC -- Ta
1040
VIN = 12V
1020
120 140
2.1
2.0
--40
--20
0
20 40 60
Ambient temperature, Ta -- °C
Iref -- Ta
50
VIN = 12V
45 FB = 0.8V
40
35
30
80 100
25
20
15
10
5
0
--40 --20
0
20 40 60 80 100
Ambient temperature, Ta -- °C
D max -- Ta
90
VIN = 12V
1000
980
960
85
940
920
900
880
--40 --20 0 20 40 60
Ambient temperature, Ta -- °C
FOSCS -- Ta
360
VIN = 12V
350
80 100
340
330
80
75
--40
--20
0
20 40 60 80 100
Ambient temperature, Ta -- °C
ISS -- Ta
7.0
VIN = 12V
6.5 SS = 0V
6.0
5.5
5.0
4.5
320
310
--40
--20 0
20 40 60
Ambient temperature, Ta -- °C
80
100
4.0
3.5
3.0
--40
--20 0
20 40 60
Ambient temperature, Ta -- °C
80
100
PS No.A1857-5/7
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