BD3506F_08 Datasheet, PDF (1/17 Pages) Rohm – Ultra Low Dropout Linear Regulators for PC Chipsets

TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout
Linear Regulators for PC Chipsets
BD3506F, BD3506EFV
Description
The BD3506F/EFV is an ultra-low dropout linear regulator for chipset that can achieve ultra-low voltage input to ultra-low
voltage output. By using N-MOS FET for built-in power transistor, the regulator can be used at ultra-low I/O voltage
difference up to voltage difference generated by ON resistor (Ron = 120 mΩ/100 mΩ). Because by reducing the I/O
voltage difference, large current (Iomax = 2.5A) output is achieved and conversion loss can be reduced, switching power
supply can be replaced. BD3506F/EFV does not need any choke coil, diode for rectification and power transistor which
are required for switching power supply, total cost of the set can be reduced and compact size can be achieved for the set.
Using external resistors, optional output from 0.65V to 2.5V can be set. In addition, since voltage output start-up time can
be adjusted by using the NRCS terminal, it is possible to meet the power supply sequence of the set.
Features
1) Built-in high-accuracy reference voltage circuit (0.65V±1%)
2) Built-in VCC low input maloperation prevention circuit (Vcc = 4.15V)
3) Reduced rush current by NRCS
4) Built-in ultra-low on-resistor (120/100 mΩ typ) Nch Power MOSFET (BD3506F/BD3506EFV)
5) Built-in current limiting circuit (2.5A min)
6) Built-in thermal shutdown circuit
7) Output variable type (0.65-2.5V)
8) Adoption of SOP8 package (BD3506F): 5.0 x 6.2 x 1.5 (mm)
9) Adoption of high power HTSSOP-B20 package (BD3506EFV): 5.0 x 6.4 x 1.0 (mm)
Applications
Mobile PC, desktop PC, LCD-TV, DVD, digital home appliances
●Line up
Parameter
Ron
Output Current
Package
BD3506F
120mΩ
2.5A
SOP8
BD3506EFV
100mΩ
2.5A
HTSSOP-B20
Oct. 2008