ENA1241 [SANYO]
Bi-CMOS LSI 2-channel Step-down Switching Regulator; BI - CMOS LSI双通道降压型开关稳压器
| 型号： | ENA1241 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Bi-CMOS LSI 2-channel Step-down Switching Regulator |
| 文件： | 总6页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA1241
Bi-CMOS LSI
2-channel Step-down Switching
Regulator
LV5744V
Overview
The LV5744V 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 (V -5V) for protecting the external P channel MOS gate.
CC
• 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
Output voltage
Symbol
max
Conditions
Ratings
Unit
V
V
35
33
CC
max
V
V
O
Allowable power dissipation
Operating temperature
Storage temperature
Allowable pin voltage
Pd max
Topr
Mounted on a specified board *
0.74
W
-40 to +85
-55 to +150
°C
°C
Tstg
1
CT, NON1, NON2,
7
V
INV1, INV2, FB1, FB2,
DT1, DT2, SCP, VREF
2
3
V
-5V
30
35
V
V
CC
GND, OUT1, OUT2,
V
CC
* : 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.
60408 MS 20080423-S00009 No.A1241-1/6
LV5744V
Allowable Operating Ratings at Ta = 25°C
Parameter
Supply voltage
Symbol
Conditions
Ratings
Unit
V
V
8 to 33
0 to 3.3
CC
Error amplifier input voltage
Timing capacitance
V
V
IN
C
50 to 5000
20k to 1M
pF
Hz
CT
Oscillation frequency
F
CT
Electrical Characteristics at Ta = 25°C, V
= 12V
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
Reference voltage block
Output voltage
Vref
Iref = 1mA
2.4948
2.520
2.5452
10
V
mV
mV
V
Input stability
V
V
= 8 to 33V
1
1
DLI
CC
Iref = 0 to 5mA
Load stability
V
10
DLO
V
-5V supply voltage
V
I
= -5mA
V
-5.5
CC
V
-5.0
V
-4.5
480
IN
N5
OUT
CC
CC
Triangular wave oscillator block
Oscillation frequency
Frequency fluctuation
Protection circuit block
Threshold voltage
F
C = 220pF
CT
320
1.5
400
1
kHz
%
OSC
F
V = 8 to 33V
CC
DV
V
1.7
50
1.9
100
100
2.6
V
mV
mV
µA
V
IT
Standby voltage
V
STB
Latch voltage
V
30
LT
Source current
I
1.6
1.4
2.1
1.5
SCP
Comparator threshold voltage
V
1.6
CT
Quiescent time adjustment circuit block
Input threshold voltage
(fosc = 20kHz)
Vt0
Duty cycle = 0%
0.45
0.95
0.5
1.0
0.1
0.55
1.05
1
V
V
Vt100
Duty cycle = 100%
DT1, DT2 = 0V
Input bias current
I
µA
BDT
Low voltage malfunction prevention circuit block
Threshold voltage
V
6.5
7
7.5
V
UT
Error amplifier
Input offset voltage
Input offset current
V
I
6
30
mV
nA
nA
dB
V
IO
IO
Input bias current
I
15
85
100
IB
Open gain
AV
Common mode input voltage range
Common mode rejection ratio
Maximum output voltage
Minimum output voltage
Output sink current
Output source current
PWM comparator
V
V
= 8 to 33V
0
3.3
0.4
OM
CC
CMRR
80
2.6
0.2
1
dB
V
V
OH
V
V
OL
I
FB = 1.25V
FB = 1.25V
mA
µA
OI
I
85
OO
Input threshold voltage
(fosc = 20kHz)
Vt0
Duty cycle = 0%
0.45
0.95
0.5
1.0
0.55
1.05
V
V
Vt100
Duty cycle = 100%
Output block
Output stage on resistance (upper)
Output stage on resistance (lower)
Overall device characteristics
Standby current
R
7
2
Ω
Ω
ONH
R
ONL
I
When output is off
10
mA
CCS
No.A1241-2/8
LV5744V
Package Dimensions
unit : mm (typ)
3178B
Pd max -- Ta
0.9
0.8
Specified board : 114.3×76.1×1.6mm3
glass epoxy
5.2
0.74
0.7
16
9
0.6
0.5
0.4
0.38
0.3
0.2
1
8
0.65
0.15
0.1
0
(0.33)
0.22
-40
-20
0
20
40
60
8085
100
Ambient temperature, Ta -- °C
SANYO : SSOP16(225mil)
Pin Assignment
CT
GND
NON1
INV1
FB1
1
2
3
4
5
6
7
8
16 VREF
15 SCP
14 NON2
13 INV2
12 FB2
11 DT2
10 OUT2
DT1
OUT1
V
-5V
9
V
CC
CC
Top view
No.A1241-3/8
LV5744V
Pin Function
Pin No.
Pin Name
Description
1
2
CT
GND
NON1
INV1
FB1
External timing capacitor connection pin
Ground
3
Error amplifier 1 input (+)
Error amplifier 1 input (-)
Error amplifier 1 output
Output 1 maximum duty setting
Output 1
4
5
6
DT1
7
OUT1
8
V
-5V
Power supply for output stage drive
Power supply
CC
V
9
CC
10
11
12
13
14
15
16
OUT2
DT2
Output 2
Output 2 maximum duty setting
Error amplifier 2 input (+)
Error amplifier 2 input (-)
Error amplifier 2 output
Timer latch setting
FB2
INV2
NON2
SCP
VREF
Reference voltage output
Block Diagram
V
CC
CT
Vref
Vref
REFERENCE
VOLTAGE
TRIANGLE
OSCILLATOR
-
NON1
INV1
FB1
+
-
+
OUT1
OUT2
Err
SCP Comp
+
+
PWM Comp1
Amp1
+
-
-
NON2
INV2
FB2
+
-
+
+
Err
Amp2
PWM Comp2
Vref
SCP
S
R
R
UVLO
TIMER
LATCH
REGULATOR
DT1 DT2
GND
V
CC
-5V
No.A1241-4/8
LV5744V
Timing Chart
V
CC
UVLO release voltage
VREG
NON
V
OUT
UVLO signal
ESD 1kΩ
NON
VREF
R1
R2
C1
* The voltage at the NON pin is {VREF/(R1+1k)} × 1k in UVLO mode.
No.A1241-5/8
LV5744V
Application Circuit Example
C21
F1
R22 R21
V
CC
R18
Q2
R22
L2
PGND
LV5744V
R17
Q1
L1
SGND
R19
C20
R20
Specifications of any and all SANYO Semiconductor 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
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and all semiconductor products fail with some probability. It is possible that these probabilistic failures
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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.
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product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO Semiconductor 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. SANYO Semiconductor believes information herein is accurate and
reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual
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This catalog provides information as of June, 2008. Specifications and information herein are subject
to change without notice.
PS No.A1241-6/6
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