Ordering number : ENA1475
Bi-CMOS IC
LV5809MX
Step-down Switching Regulator
Overview
LV5809MX is a 1ch step-down switching regulator. 0.2Ω FET is incorporated on the upper side to achieve high-efficiency
operation for large output current. Low-heat resistance and compact-package MFP8 (200mil) employed. Current mode
control type, with superior load current response and easy phase compensation ON/OFF pin, allowing the standby mode
with the current drain of 40µA or less Pulse-by-pulse over-current protection and overheat protection available for
protection of load devices Soft start pin to be provided with a capacitance for soft start.
Functions
• 2.5A 1ch step-down switching regulator
• Wide input dynamic range (4.5 to 18V)
• High efficiency (90% IOUT = 1A, VIN = 12V, VO = 5V)
• Standby mode
• Over-current protection
• Thermal shutdown
• Reference voltage: 0.8V
• Fixed frequency: 330kHz
• Soft start
• Compact package: MFP8 (200mil) with Exposed Pad
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 pin 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 *
7
V
2.05
W
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 both side.
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.
52009 MS 20090507-S00003 No.A1475-1/5
LV5809MX
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
VIN pin voltage
VIN
4.5 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 maximum
VBS-SW
6.5
V
EN pin maximum voltage
VEN
18
V
FB, COMP, SS pin voltage
VFSO
6
V
voltage
Electrical Characteristics at Ta = 25°C, VIN = 12V, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
40
µA
2
mA
90
%
IC current drain at standby
ICC1
EN=0V
IC current drain in operation
ICC2
EN=open
Efficiency
Effcy
VIN=12V, IOUT=1A, Vo=5V, Design target *1
Reference voltage
Vref
VIN=4.5V to 18V (±2%)
0.8
+2%
V
FB pin bias current
Iref
FB=0.8V application
10
100
nA
High-side ON resistance
RonH
BOOT=5V
0.2
Oscillation frequency
fOSC
Oscillation frequency during
fOSCS
-2%
Ω
265
330
395
kHz
26
33
40
kHz
2.1
V
short-circuit protection
EN high-threshold voltage
Venh
EN low-threshold voltage
Venl
Maximum ON DUTY
D max
Current limit peak value 1
Ic1
VIN=12V, VOUT=5V, L=10µH
2.7
5.3
A
Current limit peak value 2
Ic2
VIN=12V, VOUT=3.3V, L=10µH
3.0
5.6
A
Current limit peak value 3
Ic3
VIN=12V, VOUT=1.2V, L=10µH
3.3
5.9
Thermal shutdown temperature
Ttsd
*Design guarantee *2
160
°C
Thermal shutdown temperature
Dtsd
*Design guarantee *2
40
°C
ISS
SS=0V
0.8
V
80
%
A
hysteresis
Soft start current
6
10
14
µA
*1: Reference value (not tested before shipment)
*2: Design guarantee (value guaranteed by design and not tested before shipment)
No.A1475-2/5
LV5809MX
Package Dimensions
unit : mm (typ)
3372
TOP VIEW
SIDE VIEW
Allowable power dissipation, Pd max -- W
1.4
BOTTOM VIEW
5.0
(3.4)
(2.6)
0.43
6.0
4.4
8
1
2
0.35
(0.65)
0.15
1.27
1.2
1.15
1.0
0.8
1.15
0.6
0.4
0.2
1.7 MAX
0
-20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
0.05
(1.5)
SIDE VIEW
Pd max -- Ta
Mounted on a specified board: 46.4×31.8×1.7mm3
glass epoxy both side
SANYO : MFP8(200mil)
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
VIN=12V
+
Current Sense
Amp.
Rb
C2
C8
C1
Pre-Drive
UVLO
1:N
VOUT=3.3V
SW
L1
R10
OSC
330kHz
R1
FB
R3
+
Error
Amp.
+
PWM
comparator
D1
C4=OPEN
R2
C9
GND
COMP
C3
C5
BOOT
Short
protect
circuit
SW
COMP
SS
Internal Stable
supply
Short
protect
circuit
VIN
C6
EN
H : ON
Vref
0.8V
TSD
Internal
Regulator
Internal Regulator
(5V)
L or open : OFF
• C1,C8,C5,C9 = ceramic capacitor used.
No.A1475-3/5
LV5809MX
Pin Function
Pin No.
1
Pin name
BOOT
Function
Equivalent circuit
Upper MOS transistor boot strap capacitance connection pin.
VIN
Connect the boot capacitance of about 0.022µF between SW
pins.
To protect the SW pin’s absolute maximum rating, to ensure
Short protection
circuit
stable operation, and to eliminate noise, the boot capacitance
BOOT
serial resistance (about 100Ω) Rb proves effective.
2
VIN
Input voltage pin.
Connect substantially large (10µF 2 parallel or more)
Output MOS
capacitance between this pin and GND.
3
SW
Power switch pin.
Connect the output LC filter. Connect the above capacitance
SW
between this pin and BOOT pin.
4
GND
Ground pin.
5
FB
Feedback pin.
Sets 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 Sample Application Circuit)
VOUT = Vref × { 1 +
(27k + 4.3k)
}
10k
10µA
=3.304V
8
SS
Soft start pin.
Sets the soft start time by means of the built-in 10µA source
voltage and external soft start capacity. The soft start capacity
SS
FB
C6 can be set as follows:
VREF
0.8V
Tss
C6 = 10µA × Vref
Where, Tss is the soft start time and Vref is the reference
voltage.
Example: 1.2ms soft start time achieved
1.2ms
C6 = 10µA × 0.8V = 0.015µF
6
COMP
Phase compensation pin.
Connects with the phase compensation external capacitance
and resistance of DC/DC converter close loop.
Internal regulation line
VIN
Short protection
circuit
COMP
7
EN
Enable pin.
Converter enabled when set to the HIGH voltage and disabled
VIN
when LOW voltage or OPEN state.
5µA
1kΩ
EN
183kΩ
2pF
Q117
183kΩ
No.A1475-4/5
LV5809MX
Considerations for the design
• During use with VIN = 12V or less, the boot strap voltage may become deficient due to intermittent operation at no load,
resulting in failure of normal operation. In this case, insert a resistance of about 500Ω between VOUT and GND and
avoid the intermittent operation mode during use.
• 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.
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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.
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above.
This catalog provides information as of May, 2009. Specifications and information herein are subject
to change without notice.
PS No.A1475-5/5