SANYO LV5749V

Ordering number : ENA1376
Bi-CMOS LSI
LV5749V
1-channel Step-down Switching
Regulator
Overview
The LV5749V is a 1-channel step-down switching regulator.
Functions
• 1 channel step-down switching regulator controller.
• Load-independent soft start circuit.
• ON/OFF function.
• Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS.
• Synchronous rectification.
• Current mode control.
• Synchronous drive by external signal.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
supply voltage
VIN max
Allowable Power dissipation
Pd max
Operating temperature
Storage temperature
Conditions
Ratings
Unit
45
V
0.74
W
Topr
-40 to +85
°C
Tstg
-55 to +150
°C
Mounted on a specified board. *
* : When mounted on the specified printed circuit board (114.3 × 76.1 × 1.6mm), glass epoxy
Recommended Operating Range at Ta = 25°C
Parameter
Supply voltage range
Error amplifier input voltage
Symbol
VIN
Conditions
Ratings
Unit
8.5 to 42
V
0 to 1.6
V
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.
D2408 MS PC 20081208-S00002 No.A1376-1/6
LV5749V
Electrical Characteristics at Ta = 25°C, VIN = 12V
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
Reference voltage block
Internal reference voltage
Vref
Including offset of E/A
0.654
0.67
0.686
V
5V power supply
VDD
IOUT = 0 to 5mA
4.7
5.2
5.7
V
110
125
140
kHz
Triangular waveform oscillator block
Oscillation frequency
FOSC
RT = 220kΩ
Frequency variation
FOSC DV
VIN = 8.5 to 42V
1
%
ON/OFF circuit block
IC start-up voltage
VEN on
2.5
3.0
3.5
V
IC off voltage
VEN off
1.0
1.2
1.4
V
4
5
6
Soft start circuit block
Soft start source current
ISS SC
EN > 3.5V
Soft start sink current
ISS SK
EN < 1V
2
μA
mA
UVLO circuit block
UVLO lock release voltage
VUVLO
UVLO hysteresis
VUVLO H
7.5
8.0
8.5
V
0.7
V
5
μA
OCP circuit block
OCP charge current
IOCP
Error amplifier
Input bias current
IEA IN
Error amplifier transconductance
GEA
1000
Sink output current
IEA OSK
FB = 1.0V
Source output current
IEA OSC
FB = 0V
Current detection amplifier gain
GISNS
1400
100
nA
1800
μA/V
-100
μA
100
μA
1.5
over current limiter circuit block
Reference current 1
ILIM1
MODE = L (GND)
-10%
18.5
+10%
μA
Reference current 2
ILIM2
MODE = H (VIN)
-10%
37.0
+10%
μA
Over current detection comparator
VLIM OFS
-5
+5
mA
VIN-0.45
VIN
V
V
offset voltage
Over current detection comparator
common mode input range
PWM comparator
Input threshold voltage
Vt max
Duty cycle = DMAX
0.9
1.0
1.1
(fosc = 125kHz)
Vt0
Duty cycle = 0%
0.4
0.5
0.6
V
Maximum ON duty
DMAX
80
85
90
%
Output block
Output stage ON resistance
RONH
5
Ω
RONL
5
Ω
(the upper side)
Output stage ON resistance
(the under side)
Output stage ON current
IONH
240
mA
IONL
240
mA
(the upper side)
Output stage ON current
(the under side)
The whole device
Standby current
ICCS
EN < 1V
Mean consumption current
ICCA
EN > 3.5V
10
3
μA
mA
No.A1376-2/6
LV5749V
Package Dimensions
unit : mm (typ)
3178B
5.2
0.5
6.4
9
4.4
16
1
8
0.65
0.15
0.22
0.1
(1.3)
1.5max
(0.33)
SANYO : SSOP16(225mil)
Pin Assignment
FB 1
16 SS
COMP 2
15 ILIM
EN 3
14 VIN
RT 4
13 OCP
LV5749V
SYNC 5
12 MODE
SW 6
11 GND
CBOOT 7
10 VDD
HDRV 8
9 LDRV
Top view
No.A1376-3/6
LV5749V
Block Diagram
VIN 14
REFERENCE
VOLTAGE
5V
REGULATOR
MODE 12
UVLO
5μA
OCP 13
1.25V
+
OCP Comp1
OSP
LOGIC
+
OCP Comp2
VCC
ILIM 15
MODE L 18.5μA
MODE H 37μA
5μA
S Q
R
SD
SS 16
FB 1
0.67V
COMP 2
+
+
-
7 CBOOT
+
Current
Amp
SAW WAVE
OSCILLATOR
8 HDRV
DMAX = 90%
1.0V
0.5V
Err
Amp
6 SW
+
PWM Comp
CONTROL
Logic
5V
10 VDD
9 LDRV
shut down(SD)
4 5
RT SYNC
11 GND
3
EN
Pin Function
Pin No.
Pin name
14
VIN
Description
Power supply pin.
This pin is monitored by UVLO function. When the voltage of this pin becomes 7.5V or more by UVLO function, The IC starts
and the soft start function operates.
11
GND
Ground pin. Each reference voltage is based on the voltage of the ground pin.
10
VDD
Power supply pin for an external the lower MOS-FET gate drive.
7
CBOOT
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
6
SW
Pin to connect with switching node. The source of NchMOSFET connects to this pin.
5
SYNC
External synchronous signal input pin.
9
LDRV
An external the lower MOSFET gate drive pin.
8
HDRV
An external the upper MOSFET gate drive pin.
1
FB
Error amplifier reverse input pin.
By operating the converter, the voltage of this pin becomes 0.67V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin.
2
COMP
Error amplifier output pin.
Connect a phase compensation circuit between this pin and GND.
16
SS
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5μA.
This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes
active.
15
ILIM
Reference current pin for current detection.
The sink current of about 18.5μA flows to this pin when Low level (GND) is set to the MODE pin.
Also, the sink current of about 37μA flows to this pin when High level (VIN) is set to the MODE pin.
When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the
voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator. This
operation is reset with respect to each PWM pulse.
3
EN
13
OCP
ON/OFF pin.
Pin to set the time of the timer (during double the over current detection point)
Connect a capacitor between this pin and GND. OCP charge current : 5μA
4
RT
12
MODE
Pin to set the oscillation frequency. Connect a resistance between this pin and GND.
Pin to switch the over current detection point. Set by the low level (GND) of the ILIM pin.
Set by the high level (VIN) of the OCP pin.
When this MODE pin is set to the high level and the point of the over current detection is set by using the ILIM pin is exceeded,
the value becomes double the original value.
Also, when the MODE pin is set to the low level, the point of the over current detection remains an original value.
No.A1376-4/6
LV5749V
Timing Chart
When the MODE pin is set to the high level and the point of the over current detection is set by using the ILIM pin is
exceeded, the value becomes double the original value.
Also, when the MODE pin is set to the low level, the point of over current detection remains an original value.
Timing chart of the over current detection point switching is as below.
t
1.25V
OCP
0V
over current detection point during High MODE
over current detection point during Low MODE
Load Current
current limit × 2A
For example 6A
current limit × 1A
For example 3A
Setting Chart
1. Output voltage setting
• Setting of the output voltage VOUT is as follows.
R4
R4
VOUT = 1 + R3 × VREF = 1 + R3 × 0.67(typ) [V]
2. Soft Start setting
• Setting of capacitor C5 is as follows.
Iss × Tss
5μ × Tss
C5 = V
= 0.67 [F]
REF
Iss : Charge current value.
Tss : Soft Start time
3. OCP Timer setting
• Setting of OCP timer capacitor C11 is as follows.
5μ × Tocp
Iocp × Tocp
[F]
C11 = Vocp comp1 =
1.3
Iocp : Charge current value.
Tocp : OCP time
4. Current limiter setting
• Setting of the current limiter set resistance R5 is as follows.
R5 =
Rdson × IL max
Rdson ×Iout
=
[Ω]
Iilim
18.5μ
Iilim : ILIM current value.
IL : inductance current value
Rdson : ON resistance value between Q1 drain-souces.
No.A1376-5/6
LV5749V
Sample Application Circuit
VIN = 12V
C1
10μF/
25V × 2
C7
0.1μF/
25V
R5
12kΩ
14
VIN
5 SYNC
SYNC
H/L
12 MODE
ON/OFF
3 EN
SS
16 SS
R2
1.0kΩ
C3
0.1μF
C4
OPEN
4 RT
R7
240kΩ
15
ILIM
CBOOT 7
HDRV 8
SW 6
LDRV 9
2 COMP
C5
0.1μF
C6
1000pF
FB 1
10
V
GND OCP DD
11
13
C11
680pF
C2
1μF
Q1
MCH6406
R100
10Ω
D1
DSE010
R101
10Ω
C8
1μF
L
33μH
Q1
MCH6406 R4
10kΩ
C12
OPEN
C9
10μF × 2
VOUT = 5V
C10
OPEN
R3
1.5kΩ
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
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
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
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of December, 2008. Specifications and information herein are subject
to change without notice.
PS No.A1376-6/6