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LM2635M Datasheet

  • LM2635M

  • 5-Bit Programmable Synchronous Buck Regulator Controller

  • 14頁(yè)

  • NSC

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LM2635 5-Bit Programmable Synchronous Buck Regulator Controller
May 2000
LM2635 5-Bit Programmable
Synchronous Buck Regulator Controller
General Description
The LM2635 is a high speed controller designed specifically
for use in synchronous DC/DC buck converters for the
Pentium
鈩?/div>
II or Deschutes microprocessor. A 5-bit DAC ac-
cepts the VID code directly from the CPU and adjusts the
output voltage from 1.8V to 3.5V. It provides the power good,
over-voltage protection, and output enable features as re-
quired by Intel VRM specifications. Current limiting is
achieved by monitoring the voltage drop across the r
DS_ON
of the high side MOSFET, which eliminates an expensive
current sense resistor.
The LM2635 employs a fixed-frequency voltage mode PWM
architecture. To provide a faster response to a large and fast
load transient, two ultra-fast comparators are built in to moni-
tor the output voltage and override the primary control loop
when necessary. The PWM frequency is adjustable from 50
kHz to 1 MHz through an external resistor. The wide range of
PWM frequency gives the power supply designer the flexibil-
ity to make trade-offs between load transient response per-
formance, MOSFET cost and the overall efficiency. The
adaptive non-overlapping MOSFET gate drivers help avoid
any potential shoot-through problem while maintaining high
efficiency. BiCMOS gate drivers with rail-to-rail swing ensure
that no spurious turn-on occur. When only 5V is available, a
bootstrap structure can be employed to accommodate an
NMOS high side switch. The precision reference trimmed to
2% over temperature is available externally for use by other
regulators. Dynamic positioning of load voltage, which helps
cut the number of output capacitors, can also be imple-
mented easily.
Features
n
n
n
n
n
n
n
n
n
n
n
1.8V to 3.5V 5-bit programmable output voltage
Synchronous rectification
Power Good flag and output enable
Over-voltage protection
Initial Output Accuracy: 2% over temperature
Current limit without external sense resistor
Adaptive non-overlapping MOSFET gate drives
Adjustable switching frequency: 50 kHz to 1 MHz
Dynamic output voltage positioning
1.256V reference voltage available externally
Plastic SO-20 package
Applications
n
Motherboard power supply/VRM for Cyrix Gxm, Cyrix
Gxi, Cyrix MII, Pentium II, Deschutes, Pentium Pro,
6x86 and K6 processors
n
5V to 1.8V鈥?.5V high current power supplies
Typical Application
DS100119-1
FIGURE 1. 5V to 1.8V鈥?.5V, 14A Power Supply
Pentium
鈩?/div>
is a trademark of Intel Corporation.
漏 2000 National Semiconductor Corporation
DS100119
www.national.com

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