LM2670S-ADJ/NOPB National Semiconductor, LM2670S-ADJ/NOPB Datasheet - Page 5

• Manufacturer Part Number: LM2670S-ADJ/NOPB
• Description: IC REG SIMPLE SWITCHER TO-263-7
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM2670S-ADJ/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.2 ~ 37 V
• Current - Output: 3A
• Frequency - Switching: 260kHz
• Voltage - Input: 8 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: D²Pak, TO-263 (7 leads + tab)
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Voltage: 37V
• Output Current: 3A
• No. Of Pins: 7
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 3 - 168 Hours
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2670S-ADJ; *LM2670S-ADJ/NOPB; LM2670S-ADJ

Connection Diagrams
6-Lead Small Outline Package (M6)
Ordering Information
Note 11: The first letter "S" identifies the part as a switched capacitor converter. The next two numbers are the device number. The fourth letter "A" indicates the
grade. Only one grade is available. Larger quantity reels are available upon request.
Pin Descriptions
Circuit Description
The LM2664 contains four large CMOS switches which are
switched in a sequence to invert the input supply voltage.
Energy transfer and storage are provided by external capaci-
tors. Figure 2 illustrates the voltage conversion scheme.
When S
voltage V+. During this time interval, switches S
open. In the second time interval, S
same time, S
number of cycles, the voltage across C
V+. Since the anode of C
at the cathode of C
current. The output voltage drop when a load is added is
determined by the parasitic resistance (R
FET switches and the ESR of the capacitors) and the charge
transfer loss between capacitors. Details will be discussed in
the following application information section.
Pin
1
2
3
4
5
6
Order Number
LM2664M6X
LM2664M6
1
and S
2
Top View With Package Marking
Name
CAP−
CAP+
GND
OUT
and S
SD
V+
3
are closed, C
2
4
equals −(V+) when there is no load
are closed, C
2
Package Number
Power supply ground input.
Negative voltage output.
Connect this pin to the negative terminal of the charge-pump capacitor.
Shutdown control pin, tie this pin to V+ in normal operation, and to GND for shutdown.
Power supply positive voltage input.
Connect this pin to the positive terminal of the charge-pump capacitor.
is connected to ground, the output
MA06A
MA06A
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1
1
1
charges to the supply
and S
is charging C
2
ds(on)
will be pumped to
3
are open; at the
Package Marking
SO3A (Note 11)
SO3A (Note 11)
2
of the MOS-
and S
2
. After a
4
are
5
Tape and Reel (1000 units/rail)
Tape and Reel (3000 units/rail)
Function
FIGURE 2. Voltage Inverting Principle
Supplied as
Actual Size
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www.national.com
10003105