LM27222M National Semiconductor, LM27222M Datasheet - Page 8

• Manufacturer Part Number: LM27222M
• Description: MOSFET DRIVER/PWM CONTROL, 27222
• Manufacturer: National Semiconductor

Specifications of LM27222M

• Device Type: MOSFET
• Module Configuration: High Side / Low Side
• Peak Output Current: 4.5A
• Output Resistance: 10kohm
• Supply Voltage Range: 4V To 7V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating: RoHS Compliant

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Application Information
used, and secondly, high-side switch resistance becomes a
larger loss factor than the switching losses. Of course with a
lower input voltage, the input capacitor voltage rating can be
reduced and the inductor value can be reduced as well. For
a 4V to 6V application, the inductor can be reduced to 200nH
to 300nH. The switching frequency of the LM27212 is deter-
mined by the allowed ripple current in the inductor. This
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circuit is set for approximately 300kHz. At lower input volt-
ages, higher frequencies are possible without suffering sig-
nificant efficiency loss. Although the LM27222 can support
operating frequencies up to 2MHz in many applications, the
LM27212 should be limited to about 1MHz. The control
architecture of the LM27212 and the low propagation times
of the LM27222 potentially gives this solution the fastest
transient response in the industry.