LV5857MX [SANYO]
Step-down Switching Regulator; 降压型开关稳压器
| 型号： | LV5857MX |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Step-down Switching Regulator |
| 文件： | 总5页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA1843
Bi-CMOS IC
Step-down Switching Regulator
LV5857MX
Overview
LV5857MX is a 1ch step-down switching regulator. With built-in two 0.13Ω 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 60μA at stand-by mode. It has cycle-by-cycle over current protection for load devices. With
external capacitor, it achieves soft start.
Functions
• 3A 1ch step-down
• Thermal shutdown protection
• Reference voltage: 0.672V
• Fixed frequency: 340kHz
• Soft start / Soft stop
• Small package: MFP8 (200mil) with heat sink
• High efficiency (93% I
• Standby mode
= 1A, V = 12V, V = 5V)
OUT
IN
O
• Over-current protection(Latch off method)
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
max
Conditions
Ratings
Unit
V
Maximum input V voltage
IN
V
V
V
V
V
V
20
25
IN
BOOT pin maximum voltage
SW pin maximum voltage
BOOT pin-SW pin maximum voltage
EN Maximum Voltage
max
max
V
V
BT
V
max
7
SW
IN
max
V
BS-SW
max
EN
20
V
FB, COMP, SS pin maximum voltage
Allowable power dissipation
Junction temperature
max
fs
7
V
Pd max
Tj max
Topr
Mount on a specified board *
2.05
150
W
°C
°C
°C
Operating temperature
-20 to 80
Storage temperature
Tstg
-40 to 150
Specified substrate : 46.0mm х 32.0mm х 1.6mm 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.
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.
92910 SY 20100915-S00003 No.A1843-1/5
LV5857MX
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
V
pin voltage
V
V
V
V
V
V
8 to 18
IN
IN
BOOT pin voltage
SW pin voltage
-0.3 to 23
V
BT
-0.4 to V
IN
V
SW
BOOT pin-SW pin voltage
EN voltage
6.5
18
6
V
BS-SW
EN
V
FB, COMP, SS pin voltage
V
FSO
Electrical Characteristics at Ta = 25°C, V = 12V, unless otherwise specified.
IN
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
IC current drain at standby
IC current drain in operation
Efficiency
I
I
1
2
EN=0V
60
μA
mA
%
CC
EN=5v, FB=1V
2.5
93
CC
Effcy
Vref
V
V
=12V, I
=1A, Vo=5V, Design target *2
IN
IN
OUT
Reference voltage
=8V to 28V
-2%
0.672
10
+2%
100
V
FB pin bias current
Iref
FB=0.672V
BOOT=5V, I
nA
Ω
High-side ON resistance
Low-side ON resistance
Oscillation frequency
EN high-threshold voltage
Maximum ON DUTY
Minimum ON DUTY
RonH
RonL
=1A
OUT
0.13
0.13
340
1.5
Ω
f
kHz
V
OSC
Venth
D max
D min
Icl1
80
4
%
8
%
SW Peak Current limit
Thermal shutdown temperature
V
=12V, V
=5V, L=10μH
OUT
A
IN
Ttsd
*Design guarantee *3
*Design guarantee *3
160
40
°C
°C
Thermal shutdown temperature
hysteresis
Dtsd
Soft start current
I
SS=0V
6
35
μA
Ω
V
SS
Discharge On-Resistance
V
V
V
ON
SW
V
V
UVLO lock voltage
L
6.0
6.9
IN
IN
UVLO
UVLO lock release voltage
H
V
UVLO
*2: Reference value (not tested before shipment)
*2: Design guarantee (value guaranteed by design and not tested before shipment)
No.A1843-2/5
LV5857MX
Package Dimensions
unit : mm (typ)
3372
Pd max -- Ta
2.5
2.0
1.5
1.0
0.5
0
TOP VIEW
SIDE VIEW
BOTTOM VIEW
5.0
2.05
(3.4)
8
1.15
1
2
0.35
0.15
(0.65)
1.27
SIDE VIEW
-20
0
20
40
60
80
100
Ambient temperature, Ta -- ∞C
SANYO : MFP8(200mil)
Pin Assignment
BOOT
1
2
3
4
8
7
6
5
SS
V
EN
IN
SW
COMP
FB
GND
Top view
Block Diagram and Sample Application Circuit
BOOT (SW + Vreg.)
BOOT
V
IN
Current Sense
Rb
+
Amp.
Pre-Drive
UVLO
V
1:N
SW
OUT
-
-
OSC
340kHz
Error
Amp.
PWM
comparator
Pre-Drive
+
+
FB
GND
COMP
Soft-Stop
EN
+
-
UVP
OVP
-30%
UVLO
TSD
C3
+
-
+20%
Internal Stable
supply
Current
Limit
SS
EN
V
IN
Vref
0.672V
Internal
Regulator
TSD
Internal Regulator
(5V)
H:ON
L : OFF
C1,C2,C5,C8,C9=Ceramic capacitor
No.A1843-3/5
LV5857MX
Pin Function
Pin No.
Pin name
Function
Equivalent circuit
Upper MOS transistor boot strap capacitance connection pin.
Connect the boot capacitance of about 0.1uF 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 15Ω) Rb proves effective.
Input Voltage Pin. Connect substantially large (10uF 1 piece or 2
parallel or more) capacitance between this pin and GND.
Power Switch pin.
1
BOOT
V
IN
BOOT
2
3
V
IN
High side MOS
SW
Connect the output LC filter.
Connect the above capacitance between this pin and BOOT pin.
The discharge transistor for a Soft-Stop is connected with this
terminal (typcal 35Ω). It turns it on by either EN=L, UVLO or a
thermal shutdown.
SW
Discharge
Low side MOS
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.
(R1 + R10)
V
= Vref × { 1 +
}
OUT
R3
V
IN
Vref = 0.672V
Example: 3.3V output voltage
(See, Block Diagram and Application example)
(22k + 3.9k)
V
= 0.672 × { 1 +
}
OUT
10k
=3.353V
Soft start pin.
8
SS
Sets the soft start time by means of the built-in 6μA source
voltage and external soft start capacity. The soft start capacity C6
can be set as follows:
SS
FB
VREF
0.672V
Tss
Vref
C6 = 6μA ×
Where, Tss is the soft start time and Vref is the reference
voltage.
Example:1.7ms soft start time achieved
1.7ms
0.672V
C6 = 6μA ×
= 0.015μF
Phase compensation pin.
Connects with the phase compensation external capacitance and
resistance of DC/DC converter close loop.
6
COMP
V
IN
COMP
Enable pin.
7
EN
V
Converter enabled when set to the HIGH voltage and disabled
when LOW voltage or OPEN state.
IN
EN
2pF
No.A1843-4/5
LV5857MX
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.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
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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.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
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intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of September, 2010. Specifications and information herein are subject
to change without notice.
PS No.A1843-5/5
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