BA9700AF [ROHM]
Switching regulator for DC / DC Converters; 开关稳压器的DC / DC转换器
| 型号： | BA9700AF |
| 厂家： | 
ROHM |
| 描述： | Switching regulator for DC / DC Converters |
| 文件： | 总7页 (文件大小：144K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
Switching regulator for DC / DC
Converters
BA9700A / BA9700AF / BA9700AFV
The BA9700A, BA9700AF and BA9700AFV are switching regulators that use a pulse width modulation (PWM) system.
They use a transistor switch to stabilize the output voltage.
By the use of the transistor, power loss is decreased, fluctuation efficiency is improved, and the circuit is made more
compact and single.
!Features
1) Output voltage can step up, step down, or invert at an
arbitrary level.
6) Dead time controller restricts operation when
overloaded.
2) Low current consumption. (typically 1.7mA)
3) Wide oscillation frequency range.
(typically 2.8k ~ 470kHz)
7) Power switch can isolate all circuits in the IC.
8) Best suited for battery operated equipment.
9) Compact 14-pin SSOP package (BA9700AFV).
4) Built-in reference voltage current. (typically 2.57V)
5) Operates at low voltage. (minimally 3.55V)
!Block diagram
NON
POWER
INVERT
INPUT
INVERT
INPUT
SW
1/2 Vref
13
V
ref
N. C.
9
V
CC
14
12
11
10
8
Voltage
Regulator
+
−
30k
30k
Error
Amp
V
ref
BA9700A
BA9700AF
PWM
Comparator
Triangle
Oscillator
1
2
3
4
5
6
N. C.
7
CT
FEED
BACK
OUT
GND
D - TIME
CONT
RT
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
24
Unit
Power supply voltage
V
CC
V
1
*
*
*
BA9700A
600
350
350
Power
dissipation
2
3
Pd
mW
BA9700AF
BA9700AFV
Operating temperature
Storage temperature
Topr
Tstg
-20~+80
°C
°C
-55~+150
1 BA9700A: Reduced by 4.8 mW for each increase in Ta of 1˚C over 25˚C.
2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C.
3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C.
2, 3 When mounted on a 5.0´5.0´1.6 mm glass epoxy board.
*
*
*
* *
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V, Rt = 10kΩ, and Ct = 330pF)
Parameter
〈Reference voltage section〉
Output voltage
Symbol
Min.
Typ.
Max.
Unit
Conditions
Vref
2.48
2.57
1.29
3.00
1.00
6.00
2.57
10.0
2.66
1.36
12.0
5.00
10.0
2.66
30.0
V
Iref = 0.1mA
1/2 Vref output voltage
1/2 Vref
Line
1.22
V
Line regulation
-
mV
mV
mV
V
VCC = 3.55V~24V
Load regulation 1
Load1
Load2
-
I
I
I
ref = 0.1mA~1.0mA
Load regulation 2
-
2.48
-
ref = 0.1mA~8.0mA
Output voltage when power decreases
Output current when short-circuited
〈Triangular wave oscillation section〉
Oscillation frequency
Vref
ref = 0.1mA, VCC = 3.55V
Iosc
mA
Vref = 0V
fosc
fosc
fdv
-
-
-
230
10
1
-
-
-
kHz
%
RT
= 10kΩ, C
T
= 330pF
and C are constant
CC = 3.55~24V
Standard deviation of
oscillation frequency
R
T
T
%
V
CC
Frequency variation (V
〈Error amplifier section〉
Input offset voltage
Input offset current
Maximum input voltage
Open loop gain
)
V
IO
IO
ICR
-6.0
-100
1.60
70.0
70.0
-
-
6.0
mV
nA
V
Null Method
Null Method
Null Method
Null Method
Null Method
Null Method
I
-
100
V
1.90
80.0
80.0
180
-
A
V
-
-
dB
dB
nA
CMRR
Common-mode rejection ratio
Input bias current
I
IB
500
〈PWM comparator section〉
Threshold voltage 1
Threshold voltage 2
〈Output section〉
V
t0
-
2.04
1.43
2.24
-
V
V
DUTY 0%
V
t100
1.25
DUTY 100%
Leak
Vsat
-
-
-
10.0
2.10
µA
V
O
= 24V
Output transistor leakage current
Output saturation voltage
〈Total device〉
1.70
V
IO = 50mA
I
CC
CCS
CC
-
-
1.70
2.40
7.00
24.0
mA
µA
V
R
T
= OPEN POWER SW = 2.5V
Quiescent current
I
0
-
POWER SW = 0V
Standby current
V
3.55
Operating voltage
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Timing chart
ERR. AMP
OUTPUT
DEAD - TIME
H
L
PWM. COMP
OUTPUT
H
L
OUTPUT TR.
COLLECTOR
Fig.1
!Application examples
L1
5V
Q1 2SB1009
V
IN
V
OUT
120µH
C9 1000p
R815k
SW
1
R
9
C
8
C5
, C
6
470µ
GND
47k
470µF
RB100A
×2
R
7
8
10
3
2
560
D
1
Voltage
Regulator
Triangle
Oscillator
2.57V
30k
11
13
GND
V
ref
9
6
1.29V
N.C.
30k
R
43k
1
R
6
ERROR AMP
560
N.C.
14
12
+
C
1
−
680p
R
15k
2
5
PWM COMPARATOR
R3
7.5k
C2
4
0.047µ
7
1
C4 1µ
+
L1: RCH-875 121K (Sumida Electronics)
R4
15k
R5 20k
Fig.2 Step-down converter
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
RB100A
Q1 2SB1009
V
IN
V
OUT
D
1
C7 1000p
R810k
SW
1
R
9
330
C4, C5
470µ
×2
GND
R
7
47k
C
4706µ
L
1
220µH
8
10
3
2
Voltage
Regulator
Triangle
Oscillator
2.57V
30k
11
GND
V
ref
13
9
6
1.29V
330
R
6
30k
R
33k
1
ERROR AMP
14
12
+
−
C1
R
2
R
6.8k
3
5
PWM COMPARATOR
7.5k
680p
4
0.047µ
C2
7
1
C3 1µ
L1: RCH-875 220K (Sumida Electronics)
R4
22k
R5 39k
Fig.3 Inverting converter
L1
12V
RB100A
V
IN
V
OUT
D1
22µH
C8 1000p
R1010k
SW
1
R
11
C
7
GND
R
9
100µ
47k
470
C5, C6
470µ
×2
8
10
3
2
Q
1
2SB1009
68
Voltage
Regulator
Triangle
Oscillator
2.57V
30k
11
R
8
Q
2
Vref
2SD1380
13
9
1.29V
R
7
470
GND
30k
R1
39k
R
6
ERROR AMP
470
6
5
+
−
14
12
R2
4.7k
PWM COMPARATOR
R
3
C
1
7.5k
680p
C2
4
0.047µ
7
1
C4 1µ
L1: RCH-875 221K (Sumida Electronics)
R4
20k
R5 39k
Fig.4 Step-up converter
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Basic application board patterns and component arrangemrnts
C2
(
)
(
)
BA9700A
+
+
R
1
V
IN
C
5
V
OUT
+
+
L
Q
1
B
GND
SW
D
C
E
+
GND
C6
BA9700A - 1
Fig.5 Step-down converter
C7
R5
R8
C2
VOUT
C4
BA9700A
+
R
1
VIN
SW
R3
C5
L
+
GND
Q
B
1
GND
+
C
E
D1
BA9700A - 2
Fig.6 Inverting converter (BA9700A)
C2
R6
BA9700A
C6
R
2
1
+
V
IN
V
OUT
R
R8
Q
1
Q2
+
B
C
E
B
C
E
GND
GND
+
L
C5
Fig.7 Step-up converter (BA9700A)
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Electrical characteristic curves
1M
1M
100k
10k
1k
4.00
3.50
R
CT
CT
CT
= 220pF
T = 10k
100k
10k
1k
3.00
Ω
2.50
R
R = 20kΩ
T
T = 30k
= 2200pF
= 0.022µF
2.00
1.50
1.00
0.50
0.00
Ω
5
10
15
CC (V)
20
25
100p
1000p
0.01µ
0.1µ
1k
10k
100k
1M
V
CT (F)
RT (Ω)
Fig.10 Output voltage vs. operating
voltage for the reference
voltage section
Fig.9 Oscillation frequency
Fig.8 Oscillation frequency
characteristic vs. triangular
characteristic vs. triangular
wave oscillator resistance (2)
wave oscillator resistance (1)
80
60
40
20
300
200
100
0
-100
-200
0
-20
-40
0
100
1k
10k 100k
1M
10M
FREQUENCY (Hz)
Fig.11 Phase and gain vs. frequency
for the error amplifier
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!External dimensions (Units : mm)
BA9700A
BA9700AF
19.4±0.3
8.7±0.2
14
1
8
7
8
14
1
7.62
7
1.27
0.4±0.1
0.3Min.
0°∼15°
2.54
0.5±0.1
0.15
DIP14
SOP14
BA9700AFV
5.0±0.2
14
8
7
1
0.65
0.22±0.1
0.3Min.
0.1
SSOP - B14
相关型号：
BA9700AF-E2
Switching Regulator, Voltage-mode, 0.03A, 470kHz Switching Freq-Max, PDSO14, SOP-14
ROHM
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