SANYO ENA2134

Ordering number : ENA2134
Bi-CMOS LSI
LV5747QA
1-channel Step-down Switching
Regulator
Overview
The LV5747QA is a 1-channel step-down switching regulator.
Functions
• 1 channel step-down switching regulator controller.
• Frequency decrease function at pendent.
• 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.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Allowable pin voltage
Supply voltage
Symbol
Conditions
VIN max
Ratings
Unit
45
V
VIN, SW
45
V
HDRV, CBOOT
52
V
LDRV
6.0
V
Between CBOOT to SW,
6.0
V
Between CBOOT to HDRV
EN, ILIM
VIN+0.3
V
Between VIN to ILIM
1.0
V
VDD
6.0
V
SS, FB, COMP
VDD+0.3
V
0.65
W
150
°C
Topr
-40 to +85
°C
Tstg
-55 to +150
°C
Allowable Power dissipation
Pd max
Junction temperature
Tj max
Operating temperature
Storage temperature
Mounted on a specified board. *
* Specified board: 24mm × 15mm × 1.6mm, glass epoxy 2-layer board.
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. 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 new introduction or other application different
from current conditions on the usage of automotive device, communication device, office equipment, industrial
equipment etc. , please consult with us about usage condition (temperature, operation time etc.) 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.
O0312 20120928-S00001 No.A2134-1/6
LV5747QA
Recommended Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range
VIN
8.0 to 42
V
Error amplifier input voltage
VFB
0 to 1.6
V
Electrical Characteristics at Ta = 25°C, VIN = 24V
Ratings
Parameter
Symbol
Conditions
Unit
min
typ
max
Reference voltage block
Internal reference voltage
Vref
Including offset of E/A
5V power supply
VDD
IOUT = 0 to 5mA
0.698
0.708
0.718
V
4.7
5.2
5.7
V
335
385
435
kHz
Triangular waveform oscillator block
Oscillation frequency
FOSC
Frequency variation
FOSC DV
VIN = 8 to 42V
Oscillation frequency fold back
VOSC FB
FB voltage detection after SS ends
FOSC FB
VFB = 0V
IC start-up voltage
VEN on
VIN = 8 to 42V
start-up voltage hysteresis
VEN hys
1
%
0.5
V
detection voltage
Oscillatory frequency after fold back
25
45
60
3.4
4.3
1.0
1.2
4
5
kHz
ON/OFF circuit block
V
V
Soft start circuit block
Soft start source current
ISS SC
EN > 4.3V
Soft start sink current
ISS SK
EN < 1V, VDD = 5V
Soft start end voltage
VSS END
0.9
UVLO lock release voltage
VUVLO
7.0
UVLO hysteresis
VUVLO H
6
2
μA
mA
1.1
1.3
7.4
7.8
V
UVLO circuit block
0.6
V
V
Error amplifier
Input bias current
IEA IN
Error amplifier gain
GEA
1000
Common mode input range
VEA R
VIN = 8 to 42V
Sink output current
IEA OSK
FB = 1.0V
Source output current
IEA OSC
FB = 0V
Current detection amplifier gain
GISNS
1400
0.0
100
nA
1800
μA/V
1.6
V
-100
μA
100
μA
1.3
over current limiter circuit block
Reference current
ILIM
Over current detection comparator
VLIM OFS
+10%
μA
-5
+5
mV
VIN-0.45
VIN
V
-10%
20
offset voltage
Over current detection comparator
common mode input range
PWM comparator
Input threshold voltage
Maximum ON duty
Vt max
Duty cycle = DMAX, SW = VIN
1.0
1.1
1.2
V
Vt0
Duty cycle = 0%, SW = VIN
0.4
0.5
0.6
V
85
90
95
%
DMAX
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 > 4.3V
60
3.3
μA
mA
No.A2134-2/6
LV5747QA
Package Dimensions
unit : mm (typ)
3444
Pd max -- Ta
SIDE VIEW
TOP VIEW
BOTTOM VIEW
(1.7)
0.4
3.0
(1.7)
3.0
16
1 2
2 1
0.8 MAX
0.5
SIDE VIEW
(0.75)
0.25
Allowable power dissipation, Pd max -- W
1.0
0.8
0.65
0.6
0.4
0.34
0.2
0
--40
0.035
Specified board: 24×15×1.6mm3
glass epoxy 2-layer board.
--20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
SANYO : VQFN16J(3.0X3.0)
No.A2134-3/6
LV5747QA
COMP
1
EN
2
SW
CBOOT
FB
NC
NC
SS
Pin Assignment
16
15
14
13
12
ILIM
11
VIN
3
10
GND
4
9
VDD
(17)
7
8
LDRV
6
NC
HDRV
5
NC
SUBGND
(Top view)
Pin Function
Pin No.
Pin name
Description
1
COMP
Error amplifier output pin. Connect a phase compensation circuit between this pin and FB.
2
EN
ON/OFF pin.
3
SW
Pin to connect with switching node. The source of NchMOSFET connects to this pin.
4
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.
5
HDRV
An external the upper MOSFET gate drive pin.
NC
NC denotes no internal connection.
8
LDRV
An external the lower MOSFET gate drive pin.
Power supply pin for an external the lower MOS-FET gate drive.
6, 7,
14, 15
9
VDD
10
GND
Ground pin. Each reference voltage is based on the voltage of the ground pin.
11
VIN
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO
12
ILIM
Reference current pin for current detection. The sink current of about 20μA flows to this pin.
function, The IC starts and the soft start function operates.
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.
13
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.
16
FB
Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.708V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin
voltage becomes 0.5V or less after a soft start ends, the frequency fold back function operations, and the oscillating frequency
is falling with the FB voltage.
17
SUBGND
It is connected to SUB of the IC. Thus, use it with electric potential same as a GND pin.
No.A2134-4/6
LV5747QA
Block Diagram
VIN 11
REFERENCE
VOLTAGE
5V
REGULATOR
+
ILIM 12
S Q
R
OCP Comp
VIN
20μA
+
-
Current Amp
5μA
+
- SD
SD
4 CBOOT
5 HDRV
S Q
R
DMAX = 90%
1.1V
0.5V
1.1V
SS 13
0.7V
FB 16
COMP 1
UVLO
TSD
+
+
-
SAW WAVE
OSCILLATOR
fosc forced
1/8
Error
Amp
3 SW
+
CONTROL
Logic
5V
9 VDD
PWM Comp
8 LDRV
+
0.5V
10 GND
shut down(SD)
FFOLD
Amp
17 SUBGND
2
EN
Sample Application Circuit
VIN = 8 to 42V
C1
C7
R5
11
VIN
C6
12
ILIM
CBOOT 4
C2
Q1
HDRV 5
2 EN
ON/OFF
L
OUT
SW 3
Q2
13 SS
1 COMP
R1
C5
R4
C4
C9
FB 16
C10
D1
R2
C3
D2
LDRV 8
SUBGND GND
17
10
C11
VDD 9
R3
C8
GND
No.A2134-5/6
LV5747QA
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.
Regarding monolithic semiconductors, if you should intend to use this IC continuously under high temperature,
high current, high voltage, or drastic temperature change, even if it is used within the range of absolute
maximum ratings or operating conditions, there is a possibility of decrease reliability. Please contact us for a
confirmation.
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.
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
intellectual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of October, 2012. Specifications and information herein are subject
to change without notice.
PS No.A2134-6/6