LM2597HVM-12/NOPB National Semiconductor, LM2597HVM-12/NOPB Datasheet - Page 31

• Manufacturer Part Number: LM2597HVM-12/NOPB
• Description: IC REG SIMPLE SWITCHER 8-SOIC
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM2597HVM-12/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 12V
• Current - Output: 500mA
• Frequency - Switching: 150kHz
• Voltage - Input: 4.5 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Package: 8SOIC N
• Minimum Input Voltage: 4.5 V
• Maximum Input Voltage: 60 V
• Switching Frequency: 150(Typ) KHz
• Operating Supply Voltage: 4.5 to 60 V
• Maximum Output Current: 0.5 A
• Output Type: Fixed
• Output Voltage: 12 V
• Efficiency: 88(Typ) %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2597HVM-12; *LM2597HVM-12/NOPB; LM2597HVM-12

Application Information
(Continued)
eral hundred mA on the regulated positive output for the
charge pump to work correctly. Also, resistor R1 is required
to limit the charging current of C1 to some value less than
the LM2597 current limit (typically 800 mA).
This method of generating a negative output voltage without
an additional inductor can be used with other members of
the Simple Switcher Family, using either the buck or boost
topology.
DS012440-51
FIGURE 34. Charge Pump for Generating a
Low Current, Negative Output Voltage
31
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