Ordering number : ENA0853
Bi-CMOS LSI
2-channel Step-down Switching
Regulator
LV5743V
Overview
The LV5743V is a 2-channel step-down switching regulator.
Features
• Provides dual switching regulator control circuits integrated on the chip.
• Output-stage push-pull structure enabling high efficient operation.
• Provides power supply (VCC-5V) for protecting the external P channel MOS gate.
• Built-in timer latch type SCP (short-circuit protection circuit)
• Built-in UVLO (Low voltage malfunction prevention circuit)
• Built-in reference voltage circuit
• Max_On_Duty is adjustable.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
Conditions
Ratings
Unit
VCC max
35
V
Output voltage
VO max
33
V
Allowable power dissipation
Pd max
0.74
W
Mounted on a specified board *
Operating temperature
Topr
-20 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
7
V
Allowable pin voltage
1
CT, NON1, NON2,
INV1, INV2, FB1, FB2,
DT1, DT2, SCP, VREF
2
VCC-5V
30
V
3
GND, OUT1, OUT2,
35
V
VCC
* : Specified board : 114.3×76.1×1.6mm3, glass epoxy board
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor 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
products described or contained herein.
80107 MS PC 20070601-S00001 No.A0853-1/6
LV5743V
Allowable Operating Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC
8 to 33
Error amplifier input voltage
VIN
0 to 3.3
V
V
Timing capacitance
CCT
50 to 5000
pF
Oscillation frequency
FCT
20k to 1M
Hz
Electrical Characteristics at Ta = 25°C, VCC = 12V
Parameter
Symbol
Ratings
Conditions
Unit
min
typ
max
2.4948
2.520
2.5452
1
10
mV
mV
Reference voltage block
Output voltage
Vref
Iref = 1mA
Input stability
VDLI
VCC = 8 to 33V
Load stability
VDLO
Iref = 0 to 5mA
VIN-5V supply voltage
VN5
1
10
IOUT = -5mA
VCC-5.5
VCC-5.0
VCC-4.5
CCT = 220pF
320
400
480
V
V
Triangular wave oscillator block
Oscillation frequency
FOSC
Frequency fluctuation
FDV
VCC = 8 to 33V
1
kHz
%
Protection circuit block
Threshold voltage
Standby voltage
VIT
1.5
VSTB
1.7
1.9
V
50
100
mV
Latch voltage
VLT
30
100
mV
Source current
ISCP
1.6
2.1
2.6
μA
Comparator threshold voltage
VCT
1.4
1.5
1.6
V
Duty cycle = 0%
0.45
0.5
0.55
V
0.95
1.0
1.05
V
0.1
1
μA
7
7.5
V
Quiescent time adjustment circuit block
Input threshold voltage
Vt0
(fosc = 20kHz)
Vt100
Duty cycle = 100%
Input bias current
IBDT
DT1, DT2 = 0V
Low voltage malfunction prevention circuit block
Threshold voltage
VUT
6.5
Error amplifier
Input offset voltage
VIO
Input offset current
IIO
Input bias current
IIB
15
Open gain
AV
85
Common mode input voltage range
Common mode rejection ratio
VOM
6
VCC = 8 to 33V
0
CMRR
30
nA
100
nA
dB
3.3
80
Maximum output voltage
VOH
2.6
Minimum output voltage
VOL
0.2
mV
V
dB
V
0.4
V
Output sink current
IOI
FB = 1.25V
1
mA
Output source current
IOO
FB = 1.25V
85
μA
Vt0
Duty cycle = 0%
0.45
0.5
0.55
V
Duty cycle = 100%
0.95
1.0
1.05
V
PWM comparator
Input threshold voltage
(fosc = 20kHz)
Vt100
Output block
Output stage on resistance (upper)
RONH
7
Ω
Output stage on resistance (lower)
RONL
2
Ω
Overall device characteristics
Standby current
ICCS
When output is off
5
mA
No.A0853-2/8
LV5743V
Package Dimensions
unit : mm (typ)
3178B
Pd max -- Ta
Allowable power dissipation, Pd max – W
0.9
5.2
0.5
6.4
9
4.4
16
1
8
0.65
0.22
0.8
0.74
0.7
0.6
0.5
0.4
0.38
0.3
0.2
0.1
0
– 20
1.5max
(0.33)
0.15
Specified board : 114.3×76.1×1.6mm3
glass epoxy
0
20
40
60
80 85
100
0.1
(1.3)
Ambient temperature, Ta – °C
SANYO : SSOP16(225mil)
Pin Assignment
1
16
VREF
GND
2
15
SCP
NON1
3
14
NON2
INV1
4
13
INV2
FB1
5
12
FB2
DT1
6
11
DT2
OUT1
7
10
OUT2
VCC-5V
8
9
VCC
LV5743
CT
Top view
No.A0853-3/8
LV5743V
Pin Function
Pin No.
Pin Name
1
CT
Description
External timing capacitor connection pin
2
GND
3
NON1
Ground
Error amplifier 1 input (+)
4
INV1
Error amplifier 1 input (-)
5
FB1
Error amplifier 1 output
6
DT1
7
OUT1
8
VCC-5V
9
VCC
Power supply
10
OUT2
Output 2
11
DT2
Output 1 maximum duty setting
Output 1
Power supply for output stage drive
Output 2 maximum duty setting
12
FB2
Error amplifier 2 input (+)
13
INV2
Error amplifier 2 input (-)
14
NON2
Error amplifier 2 output
15
SCP
16
VREF
Timer latch setting
Reference voltage output
Block Diagram
Vref
NON1
INV1
Vref
+
-
FB1
NON2
INV2
FB2
+
-
VCC
CT
REFERENCE
VOLTAGE
TRIANGLE
OSCILLATOR
Err
Amp1
+
+
-
+
+
SCP Comp
+
+
Err
Amp2
OUT1
PWM Comp1
OUT2
PWM Comp2
Vref
SCP
S
R
TIMER
LATCH
R
UVLO
REGULATOR
DT1 DT2
GND
VCC-5V
No.A0853-4/8
LV5743V
Timing Chart
VCC
UVLO release voltage
VREG
NON
VOUT
UVLO signal
ESD
NON
1kΩ
VREF
R1
R2
C1
* The voltage at the NON pin is {VREF/(R1+1k)} × 1k in UVLO mode.
No.A0853-5/8
LV5743V
Sample Application Circuit Diagram
C21
C19
Q2
C13
R17
C17
D1
C16
L1
C5
R8
C4
R7
C18
D2
VCC 9
8 VCC-5V
C11
C12
OUT2 10
6 DT1
PGND
R6
5 FB1
R5 C3
4 INV1
3 NON1
C2
R4
R2 R1
R3
2 GND
1 CT
C1
C14
R16
R22
LV5743
R20
Q2
L2
7 OUT1
R14
DT2 11
C9
R18
C15
C10
R15
R13
C8
R9
INV2 13
NON2 14
VCC
FB2 12
C7
R12
R11
C6
SCP 15
VREF 16
F1
R21
R10
R22
R19
SGND
C20
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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
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This catalog provides information as of August, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0853-6/6