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参数资料
| 型号： | BD9740KN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV SYNC 48UQFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出数： | 7 |
| 输入电压： | 1.5 V ~ 10 V |
| 频率 - 开关： | 100kHz ~ 1.2MHz |
| 电流 - 输出： | 30mA |
| 同步整流器： | 是 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 48-UQFN |
BD9739KN,BD9740KN
● BD9739KN Pin No.
Technical Note
Pin No.
61
29
54
14
59
8,9,57
42
30
51,52,53
58
Pin name
VBAT
VCC
PVCC
PVCCH
PVCCL
PGND23,PGND
GND
VREGA
OUT4,5,6
OUT7B
Pin No.
60
4,5,12,13
6,7,10,11
55
56
35
43
26,24,21,47,46,41,39
27,23,22,48,45,40
37,38
Pin name
OUT1B
DRAIN2,3H
DRAIN2,3L
OUT1M
OUT1S
VREF
DTC 5
FB 1 ～ 7
INV 1 ～ 6
INV7I,INV7V
Pin No.
44,36
28
25
34
33
32
1,64
15,16,17,18,19,20
50,2,62
31,49,3,63
Pin name
NON5,7
SS1
SS23
RT
CT
SCP
UDSEL1,5
STB 1,23,4,5,6,7
SWIN4,6,7
SWOUT 1,4,6,7
● BD9740KN Pin No.
Pin No.
4
21
46
10
42
6,7
31
22
40,41,45,47,48
Pin name
VBAT
VCC
PVCC
PVCCH
PGND
PGND4
GND
VREGA
OUT1,3,5,6,7
Pin No.
44
43
5
9
8
20
3,38,39
16,18,27,28,32,35,36
15,19,26,29,33,34
Pin name
MAIN2
SUB2
OUT1B
DRAIN4H
DRAIN4L
VREF
DTC 5 ～ 7
FB 1 ～ 7
INV 1 ～ 5,7
Pin No.
30,37
17
23
24
25
1
2
11,12,13,14
Pin name
NON6,NON7
SS1
RT
CT
SCP
UDSEL12
UDSEL3
STB1,234,56,7
● Block diagram explanation and setting peripheral IC components
1. Voltage reference (VREF)
VREF is the reference voltage source of 1.0V output voltage.
Connect a capacitor to prevent oscillation. Set the capacitance from 1.0 μ F to 10 μ F.
2. REGA
REGA and REGD are regulators with output voltages of 2.5 V. REGA is used as the power supply for the IC's internal
blocks.Connect a capacitor to prevent oscillation. Set the capacitance from 4.7 μ to 10 μ F.
3. UDSEL
To enable step-up mode, connect VCC to the UDSEL pin. To enable step-up mode connect 0V to the UDSEL pin.
When using the startup circuit, set the pin to step-up mode. Because the pin uses COMS inverter input, you must connect
the pin to either GND or VCC in order to prevent undefined input.
4. On/off logic
The voltage applied to the STB pins can be controlled whether each channel is on or off.
CH1, CH4, and CH5 can be controlled independently, while CH2 and CH3 can be controlled simultaneously.
Applying a voltage of over 2 V turns on the corresponding channel(s), while leaving the pin open or applying 0 V turns off
the corresponding channel(s).
Turning off all channels causes the IC to be in a standby state.
Each pin is connected to GND by a 400 k ? pull-down resistor.
5. Setting the short protection detection time
The detection time can be set when the capacitor is connected to the SCP pin.
When the detection time is reached, the latch circuit operates, turning off the output for all channels.
To reset the latch circuit, turn all STB pins off, and then back on again.
Detection time (sec) = CSCP ? VTSC / ISCP
(CSCP: capacitance; VTSC: SCP pin detection voltage, ISCP: SCP pin source current)
*Set the capacitor that is connected to the SCP pin from 0.001 μ F to 2.2 μ F.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
7/14
2010.09 - Rev.A
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