BD9740KN-E2 Rohm Semiconductor, BD9740KN-E2 Datasheet - Page 13

• Manufacturer Part Number: BD9740KN-E2
• Description: IC SWITCH REG W/FET 48UQFN
• Manufacturer: Rohm Semiconductor
• Series: -r
• Type: Step-Down (Buck), Step-Up (Boost), Inverting, PWMr

Specifications of BD9740KN-E2

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 7
• Voltage - Output: -
• Current - Output: 30mA
• Frequency - Switching: 100kHz ~ 1.2MHz
• Voltage - Input: 1.5 V ~ 10 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

BD9739KN,BD9740KN
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
13) Ground wiring patterns
14) STB pin voltage
15) Common supply voltage
16) Setting the MAX DUTY
(Pin A)
The power supply and ground lines must be as short and thick as possible to reduce line impedance. Fluctuating voltage
on the power ground line may damage the device.
Set the STB pin voltage to 0.3 V or lower when setting channels to a standby state, or to 2.0 V or higher when setting
channels to an operational state. Do not lengthen transition times or fix the STB pin voltage to values higher than 0.3 V or
lower than 2.0 V. Doing so may cause the IC to malfunction.
Use a common supply voltage for both the driver block and the main block. The IC is not compatible with applications
requiring the driver block to be used while applying user-selected voltages.
MAX DUTY limitations may not operate when using the IC at high frequencies. When using the IC in such applications,
allow for sufficient margins when setting external components.
N
P
＋
PCB
Resistor
N
P
Parasitic elements
P
＋
Fig. 11 Example of Simple Bipolar IC Architecture
N
Parasitic elements
(Pin B)
N
P
Transistor (NPN)
＋
C
13/14
PCB
B
N
N
P
GND
E
P
＋
N
GND
Other Adjacent
Elements
(Pin B)
(Pin A)
GND
B
Technical Note
2010.09 - Rev.A
Parasitic elements
C
E
GND
Parasitic
elements