lm2612abpx National Semiconductor Corporation, lm2612abpx Datasheet - Page 2

• Manufacturer Part Number: lm2612abpx
• Description: 400ma Sub-miniature, Programmable, Step-down Dc-dc Converter For Ultra Low-voltage Circuits
• Manufacturer: National Semiconductor Corporation

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Connection Diagrams
micro SMD package
Ordering Information
Pin Description
(*) note the pin numbering scheme for the MicroSMD package was revised in April, 2002 to comform to JEDEC standard. Only the pin numbers were revised. No
changes to the physical location of the inputs/outputs were made. For reference purpose, the obsolete numbering has FB as pin 1, VID1 as pin 2, VID0 as pin 3,
SYNC as pin 4, EN as pin 5, PGND as pin 6, SW as pin 7, PVIN as pin 8, VDD as pin 9 and SGND as pin 10.
Pin Number(*)
10-Pin micro SMD
LM2612ABP
LM2612BBP
LM2612ABPX
LM2612BBPX
Order Number
A1
B1
C1
D1
D2
D3
C3
B3
A3
A2
SYNC/MODE
Pin Name
10-bump Wafer Level Chip Scale
PGND
SGND
PVIN
TOP VIEW
VID1
VID0
VDD
SW
FB
EN
Package Type
(micro SMD)
Feedback Analog Input. Connect to the output at the output filter capacitor (Figure 1)
Output Voltage Control Inputs. Set the output voltage using these digital inputs (see Table
1). The output defaults to 1.5V if these pins are unconnected.
Synchronization Input. Use this digital input for frequency selection or modulation control.
Set: SYNC/MODE = high for low-noise 600kHz PWM mode SYNC/MODE = low for
low-current PFM mode SYNC/MODE = a 500kHz - 1MHz external clock for
synchronization to an external clock in PWM mode. See Synchronization and Operating
Modes in the Device Information section.
Enable Input. Set this CMOS Schmitt trigger digital input high to VDD for normal
operation. For shutdown, set low to SGND. Set EN low during power-up and other low
supply voltage conditions. (See Shutdown Mode in the Device Information section.)
Power Ground
Switching Node connection to the internal PFET switch and NFET synchronous rectifier.
Connect to an inductor with a saturation current rating that exceeds the 850mA max
Switch Peak Current Limit specification of the LM2612 (Figure 1)
Power Supply Input to the internal PFET switch. Connect to the input filter capacitor
(Figure 1).
Analog Supply Input. If board layout is not optimum, an optional 0.1µF ceramic capacitor
is suggested (Figure 1)
Analog and Control Ground
20007104
NSC Package
BPA10VWB
2
Drawing
Function
250 Units, Tape and Reel
250 Units, Tape and Reel
3000 Units, Tape and Reel
3000 Units, Tape and Reel
BOTTOM VIEW
Supplied As
20007105