Ordering number : ENA2120B
LV58063MC
Bi-CMOS IC
Step-down Switching Regulator
http://onsemi.com
Overview
LV58063MC is a 1ch step-down switching regulator. 0.13Ω FET is incorporated on the upper side to achieve
high-efficiency operation for large output current.
Low-heat resistance and compact-package SOP8L (200mil) employed.
Current mode control gives superior load current response with easy phase compensation.
EN pin, allowing the standby mode with the current drain of 70μA.
Pulse-by-pulse over-current protection and overheat protection available for protection of load devices.
Externally adjustable soft start time.
Function
• 3A 1ch step-down switching regulator
• Thermal shutdown
• Wide input range (8 to 28V)
• Reference voltage: 0.8V
• High efficiency (90% IOUT=1A, VIN=12V, VOUT=5V)
• Fixed frequency: 370kHz
• Standby mode
• Soft start
• Over-current protection
• Compact package: SOP8L (200mil) with exposed pad
• Overshoot control after over-current protection event
SOP8L (200mil)
Application
• LCD/PDP-TV
• STB
• White Goods
• Office equipment
• General consumer electronics
ORDERING INFORMATION
See detailed ordering and shipping information on page 6 of this data sheet.
Semiconductor Components Industries, LLC, 2014
July, 2014
71814NK 20140707-S00003/40414NK/91212NKPC No.A2120-1/6
LV58063MC
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum input VIN voltage
Symbol
Conditions
Ratings
Unit
VIN max
BOOT pin maximum voltage
VBT max
SW pin maximum voltage
VSW max
BOOT pin-SW pin maximum voltage
FB, EN, COMP, SS pin maximum
32
V
37
V
VIN max
V
VBS-SW max
7
V
Vfs max
7
V
2.05
W
voltage
Allowable power dissipation
Pd max
Mount on a specified board *
Junction temperature
Tj max
150
°C
Operating temperature
Topr
-20 to +80
°C
Storage temperature
Tstg
-40 to +150
°C
* Specified board: 46.4mm × 31.8mm ×1.7mm, glass epoxy.
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 those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
VIN pin voltage
VIN
8 to 28
BOOT pin voltage
VBT
-0.3 to 34
V
SW pin voltage
VSW
-0.4 to VIN
V
BOOT pin-SW pin voltage
VBS-SW
FB, EN, COMP, SS pin voltage
VFSO
V
6.5
V
6
V
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics at Ta = 25°C VIN = 12V, unless otherwise specified.
Ratings
Parameter
Symbol
Conditions
IC current drain in standby
ICC1
EN=0V
IC current drain in operation
ICC2
EN=open, FB=1V
Efficiency
Effcy
VIN=12V, IOUT=1A, VOUT=5V
Design target: *1
Reference voltage
Vref
VIN=8V to 28V (±2%)
FB pin bias current
Iref
FB=0.8V application
High-side ON resistance
RonH
BOOT=5V
Low-side ON resistance
RonL
Oscillation frequency
FOSC
Oscillation frequency during
FOSCS
min
typ
-2%
Unit
max
70
μA
5
mA
90
%
0.8
+2%
V
10
100
nA
Ω
0.13
Ω
7
296
370
444
kHz
30
38
46
kHz
1.9
V
short-circuit protection
EN high-threshold voltage
Venh
EN low-threshold voltage
Venl
EN pull-up corrent
Ien
Maximum ON DUTY
D max
Current limit peak value
Icl
0.8
EN=0V
VIN=12V, VOUT=5V, L=10μH
V
16
μA
80
%
3.8
A
Thermal shutdown temperature
Ttsd
*Design guarantee *2
160
°C
Thermal shutdown temperature
Dtsd
*Design guarantee *2
40
°C
ISS
SS=0V
hysteresis
Soft start current
6
10
14
μA
*1: Design target (not tested before shipment)
*2: Design guarantee (value guaranteed by design and not tested before shipment)
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
No.A2120-2/6
LV58063MC
Package Dimensions
unit : mm
SOIC8 N EP / SOP8L (200 mil)
CASE 751DM
ISSUE O
No.A2120-3/6
LV58063MC
Pd max -- Ta
Allowable power dissipation, Pd max -- W
2.5
Mounted on a specified board: 46.4×31.8×1.7mm3
glass epoxy both side
2.05
2.0
1.5
1.15
1.0
0.5
0
-20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
Pin Assignment
BOOT 1
8 SS
VIN 2
7 EN
SW 3
6 COMP
GND 4
5 FB
Top view
Block Diagram and Sample Application Circuit (3.3V output)
BOOT (SW +Vreg.)
BOOT
C2=10μF/25V
VIN=12V
+
Current Sense
Amp.
Rb=0Ω
C8=10μF/25V
C1=
0.01μF
Pre-Drive
UVLO
R1=27kΩ
FB
R3=10kΩ
OSC
370kHz
+
Error
Amp.
+
PWM
comparator
Pre-Drive
SW
D1=MBRA340
1:N
R10=4.3kΩ
VOUT=3.3V
L1=10μH
C5=22μF/16V
GND
COMP
C9=22μF/16V
R2=2.4kΩ
C3=
6800pF
+
-
Current
Limit Logic
C4=OPEN
Internal Stable
SS
supply
EN
Vref
0.8V
VIN
C6=0.015μF
H:ON or OPEN
TSD
Internal
Regulator Internal Regulator
(5V)
L:OFF
• C1,C8,C5,C9 = Ceramic capacitor
• L1=CDRH105RNP-100NC (sumida)
No.A2120-4/6
LV58063MC
Pin Function
Pin No.
1
Pin name
BOOT
Description
Equivalent Circuit
Internal high side mos fet boot strap capacitor
Pin.
Connect around 0.01μF capacitor or greater
between SW and BOOT.
To operate within absolute maximum rating of
SW, to keep stable operation, and to reduce
switching noise, please use a series resistor, Rb
(value is around 100Ω) is recommended to use.
2
VIN
Input Voltage Pin.
See BOOT
Large Filter Capacitor ( equal or larger than
20μF) should be connected between VIN and
GND to eliminate noise on the input and to
operate properly.
When using electrolytic capacitors, it is
recommended to add a ceramic capacitor of
about 0.1uF between VIN-GND for stability.
3
SW
Power Switching Pin.
See BOOT
Connect the output LC filter.
Connect the above-mentioned capacitor between
this pin and BOOT pin.
4
GND
Ground pin.
5
FB
Feedback pin.
Connect a voltage divider resistor across FB to
set the regulated output voltage. The output
Internal regulated
VIN
voltage is given by next equation.
VOUT = Vref × { 1 +
(R1 + R10)
}
R3
10μA
Vref = 0.8V
Example: 3.3V output voltage
(See Block Diagram and Sample Application
FB
SS
Circuit)
(27k + 4.3k)
VOUT = 0.8 × { 1 +
}
10k
VREF
0.8V
=3.304V
6
COMP
Phase compensation pin.
Connect an external capacitor and a resistor for
the DC DC converter close loop-phase
VIN
Internal regulation line
compensation.
COMP
Clump circuit
Continued on next page.
No.A2120-5/6
LV58063MC
Continued from preceding page.
Pin No.
7
Pin name
EN
Description
Equivalent Circuit
Enable Pin.
VIN
If applying logically high voltage, or left open, the
converter operates.
If connected to GND, the converter’s operation
EN
stops.
Q117
It is not applied to the EN before VIN is applied.
2pF
8
SS
See FB
Soft start Pin
Internal source current (10μA) and external
capacitor will make soft start time.
Soft start capacitor, C6 is given by next equation,
Tss
C6 = 10μA × Vref
Where, Tss : soft start time,
Vref : reference voltage
Example : soft start time 1.2ms
1.2ms
C6 = 10μA × 0.8 V = 0.015μF
Considerations for the design
• Insertion of serial beads in the Schottky diode for removal of noise may cause generation of the negative voltage on SW
pin deviating from the absolute maximum rating at the SW pin, resulting in failure of normal operation. Please, do not
insert beads as above described. Instead, remove noise by Rb resistor.
• Exposed pad on the bottom side of the IC should be soldered. We cannot recommend other usages of the exposed pad.
ORDERING INFORMATION
Device
LV58063MC-AH
Package
SOP8L (200mil)
(Pb-Free / Halogen Free)
LV58063MCZ-AH
SOP8L (200mil)
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
2000 / Tape & Reel
2000 / Tape & Reel
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PS No.A2120-6/6