Ordering number : ENA1643
Bi-CMOS IC
LV5841M
Step-down Switching Regulator
Overview
LV5841M is a chopper type 1ch step-down regulator incorporating the drive transistor.
For the HI side switch, the 0.06Ω resistance is incorporated, enabling driving of the output up to 4.5 A with high
efficiency.
Being of a current mode control type, this product ensures satisfactory load current response and simple phase
compensation. The fold-back function is provided as the protection in case of output over-current. This function reduces
the frequency in case of over-current and thus reduce the inductor current. The overheat protection function is also
provided. For the package, MFP8 without exposed-PAD has been employed..
Functions
• 4.5A 1ch step-down switching regulator
• Input Voltage Range (5-18V)
• High efficiency: Max efficiency over 90%
• Compact package: MFP8 (225mil)
(No backside heat sink)
• Current Mode Operation
• Low impedance Switch: High-Side Switch: 60mΩ
• Soft start time 3.5ms
• Over-current protection
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Input voltage
VIN-abs
SW pin voltage
VSW-abs
EN pin voltage
VEN-abs
Conditions
FB,COMP pin
Allowable power dissipation
Pd max
With specified board *
Ratings
Unit
-0.3 to 20
V
-0.3 to VIN+0.3
V
VIN-abs
V
-0.3 to 7
V
1.0
W
150
°C
Junction temperature
Tj max
Operating temperature
Topr
-30 to 85
°C
Storage temperature
Tstg
-40 to 150
°C
* Specified board: 31.0mm × 34.0mm ×1.7mm, glass epoxy.
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.
11310 SY 20091126-S00002 No.A1643-1/5
LV5841M
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Input voltage
VIN
SW pin voltage
VSW
Conditions
Ratings
V
-0.3 to VIN+0.3
V
0.85 to 0.8VIN
V
4.5
A
Output Voltage Range
Maximum Output Current
Unit
5 to 18
IO max
Electrical Characteristics at Ta = 25°C, VIN = 12V, VOUT=5V, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min
typ
Supply Voltage
VIN
5
Reference Voltage
VFB
0.825
Starting input voltage
VUVLO1
Operation stop input voltage
VUVLO2
Feedback Voltage Input Current
IFB
IC operate current
IIN
EN starting voltage
VEN_ON
EN stopping voltage
VEN_OFF
3.95
FB=0.9V
Unit
max
18
V
0.835
0.845
V
4.65
4.9
V
4.3
V
80
nA
3
mA
2
V
0.6
0.5
Load Regulation
1
Line Regulation
Switching frequency
fOSC
Max Duty cycle
Dmax
Min Duty cycle
Dmin
Shut Down current
Isd
Soft Start Time
St
Internal MOS FET High Side
RONH
ON-Resistance
Current limiter operating voltage
IS
VIN=12V, IO=1.0A
350
500
%
600
90
2.5
V
%
kHz
%
8
%
180
μA
3.5
4.5
ms
60
90
Ω
90
160
Ω
VIN=12V
VIN=5V
VIN=12V
5.5
A
VIN=5V
5.0
A
Thermal shutdown operating temperature
TSD
*Design guarantee
160
°C
Thermal shutdown Hysteresis width
∆TSD
*Design guarantee
50
°C
*: Design guarantee (value guaranteed by design and not tested before shipment)
Pin Assignment
NC 1
8 SW
VIN 2
7 SW
AGND 3
6 EN
FB 4
5 COMP
Top view
No.A1643-2/5
LV5841M
Package Dimensions
unit : mm (typ)
3032D
Allowable power dissipation, Pd max -- W
5
0.63
4.4
6.4
8
1
4
1.27
0.15
1.7max
0.35
Mounted on a specified board: 31.0×34.0×1.7mm3
glass epoxy
1.0
0.56
0.5
0
-20
0.1
(1.5)
(0.65)
Pd max -- Ta
1.5
5.0
0
20
40
60
80
100
Ambient temperature, Ta -- C
SANYO : MFP8(225mil)
Block Diagram and Sample Application Circuit
VIN
5V
REGULATOR
+
OCP Comp V
IN
REFERENCE
VOLTAGE
0.835V
VIN=12.0V
C1
UVLO
10uFx3
Ceramic
Overload
Foldback controller
+
Soft Start
Current
Amp
1/8freq osc
D-max=90%
FB
+
+
-
SAW WAVE
OSCILLATOR
1.0V
0.5V
+
CONTROL
Logic
+
SW
VOUT=1.2V 4.5A
L1
4.7uH
R1
COMP
Cc
TSD
Shutdown(SD)
Rc
AGND
EN
H:Operate
L:Shutdown
R2
C3
10uFx3
Ceramic
No.A1643-3/5
LV5841M
Pin Function
Pin No.
Pin name
Function
1
NC
No connection
2
VIN
Power supply pin.
Connect the sufficiently large capacitance (10μF
Equivalent circuit
VIN
3 parallel or
more recommended for the output current of 3 A or more
MOS
between this pin and GND).
With the pin voltage of 4.65V or more, the soft start function is
activated and IC starts up slowly. When the pin voltage drops to
SW
4.3 V or less, IC stops operation.
7, 8
3
SW
AGND
Power Switching Output. Connect Inductor to this pin.
Each reference voltage is based on the voltage of the AGND
pin.
AGND
FB
Error amplifier reverse input pin.
By operating the converter, the voltage of this pin becomes
0.835V.
The voltage in which the output voltage is divided by an external
resistance is applied to this pin.
The output voltage is determined as the follow formula.
R1
VOUT=Vref × {1+ R2 }, Vre f= 0.835V
Example:5.0V Output voltage
(Refer to the Block Diagram and Sample Application Circuit)
3.0k
VOUT=0.835V × {1+ 6.8k } = 1.203V
5
COMP
VIN
Internal Regulation line
built-in soft start function output
4
FB
VREF
0.835V
External loop compensation pin.
Connect with the phase compensation external capacitance and
Internal regulation line
VIN
resistance of DC / DC converter close loop.
COMP
6
EN
ON / OFF pin [High : Operating / Low : Shutdown Open:
forbidden]
VIN
Operate voltage: ≥ 2V
Shutdown voltage : ≥ 0.6V
EN
No.A1643-4/5
LV5841M
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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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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
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limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
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product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
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This catalog provides information as of January, 2010. Specifications and information herein are subject
to change without notice.
PS No.A1643-5/5