Document
Hi-performance Regulator IC Series for PCs
Nch FET Ultra LDOs
for Desktop PCs Chipsets with Power Good
BD3540NUV, BD3541NUV
No.09030EBT04
●Description The BD3540NUV, BD3541NUV low-voltage output linear 1ch series chipset regulator IC operates from a very low input supply, and offers ideal performance in low input voltage to low output voltage applications. It incorporates a built-in N-MOSFET power transistor to minimize the input-to-output voltage differential to the ON resistance (RON=200mΩ~ 400mΩ) level. By lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=0.5A~1.0A) with reduced conversion loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, the BD3540NUV, BD3541NUV are designed to enable significant package profile downsizing and cost reduction. An external resistor allows the entire range of output voltage configurations between 0.65 and 2.7V, while the NRCS (soft start) function enables a controlled output voltage ramp-up, which can be programmed to whatever power supply sequence is required.
●Features 1) High-precision voltage regulator(0.65V±1%) 2) Built-in VCC undervoltage lockout circuit 3) NRCS (soft start) function reduces the magnitude of in-rush current 4) Internal Nch MOSFET driver offers low ON resistance 5) Built-in current limit circuit 6) Built-in thermal shutdown (TSD) circuit 7) Variable output 8) Small package VSON010V3030 : 3.0×3.0×1.0(mm) 9) Tracking function
●Applications Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
●Line-up
It is available to select power supply voltage and maximum output voltage.
Maximum Output Voltage
Package
Vcc=5V
0.5A 1.0A
VSON010V3030
BD3540NUV BD3541NUV
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1/16
2009.04 - Rev.B
BD3540NUV, BD3541NUV
Technical Note
●Absolute maximum ratings ◎BD3540NUV, BD3541NUV
Parameter
Input Voltage 1 Input Voltage 2 Enable Input Voltage PGOOD Input Voltage Power Dissipation 1 Power Dissipation 2 Power Dissipation 3 Operating Temperature Range Storage Temperature Range Junction Temperature
Symbol
VCC VIN Ven VPGOOD Pd1 Pd2 Pd3 Topr Tstg Tjmax
Limit
BD3540NUV
+6.0 *1 +6.0 *1
BD3541NUV
-0.3~+6.0 +6.0*1 0.70*2 1.27*2 3.03*2
-10~+100
-55~+150
+150
Unit
V V V V W W W ℃ ℃ ℃
*1 Should not exceed Pd. *2 Reduced by 5.6mW/℃ for each increase in Ta≧25℃ (when mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, 1-layer)
On less than 0.2% (percentage occupied by copper foil. *3 Reduced by 10.1mW/℃ for each increase in Ta≧25℃ (when mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, 1-layer)
On less than 7.0% (percentage occupied by copper foil. *4 Reduced by 24.2mW/℃ for each increase in Ta≧25℃ (when mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, 1-layer)
On less than 65.0% (percentage occupied by copper foil.
●Operating Voltage(Ta=25℃) ◎BD3540NUV, BD3541NUV Parameter
Input Voltage 1
Input Voltage 2
Symbol VCC.