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PDF LM2633 Data sheet ( Hoja de datos )
| Número de pieza | LM2633 | |
| Descripción | Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2633 (archivo pdf) en la parte inferior de esta página. Total 40 Páginas | ||
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August 2001
LM2633
Advanced Two-Phase Synchronous Triple Regulator
Controller for Notebook CPUs
General Description
The LM2633 is a feature-rich IC that combines three regu-
lator controllers - two current mode synchronous buck regu-
lator controllers and a linear regulator controller.
The two switching regulator controllers operate 180˚ out of
phase. This feature reduces the input ripple RMS current,
resulting in a smaller input filter.
The first switching controller (Channel 1) features an Intel
mobile CPU compatible precision 5-bit digital-to-analog con-
verter which programs the output voltage from 0.925V to
2.00V. It is also compatible with the dynamic VID require-
ments. The second switching controller (Channel 2) is ad-
justable between 1.25V to 6.0V.
Use of synchronous rectification and pulse-skip operation at
light load achieves high efficiency over a wide load range.
Fixed-frequency operation can be obtained by disabling the
pulse-skip mode.
Current-mode feedback control assures excellent line and
load regulation and a wide loop bandwidth for good re-
sponse to fast load transient events. Current mode control is
achieved through sensing the Vds of the top FET and thus
an external sense resistor is not necessary.
A power good signal is available to indicate the general
health of the output voltages.
A unique feature is the analog soft-start for the switching
controllers is independent of the slew rate of the input volt-
age. This will make the soft start behavior more predictable
and controllable. An internal 5V rail is available externally for
boot-strap circuitry (only) when no 5V is available from other
sources.
Current limit for either of the two switching channels is
achieved through sensing the top FET VDS and the value is
adjustable. The two switching controllers have under-voltage
and over-voltage latch protections, and the linear regulator
has under-voltage latch protection. Under-voltage latch can
be disabled or delayed by a programmable amount of time.
The input voltage for the switching channels ranges from 5V
to 30V, which makes possible the choice of different battery
chemistries and options.
Features
GENERAL
n Three regulated output voltages
n 4.5V to 30V input range
n Power good function
n Input under-voltage lockout
n Thermal shutdown
n Tiny TSSOP package
SWITCHING SECTION
n Two channels operating 180˚ out of phase
n Separate on/off control for each channel
n Current mode control without sense resistor
n Skip-mode operation available
n Adjustable cycle-by-cycle current limit
n Negative current limit
n Analog soft start independent of input voltage slew rate
n Power ground pins separate
n Output UVP and OVP
n Programmable output UVP delay
n 250kHz switching frequency (for Vin < 17V)
n Channel 1 output from 0.925V to 2.00V
n ±1.5% DAC accuracy from 0˚C to 125˚C
n ±1.7% initial tolerance for Channel 2
n Dynamic VID change ready
n Power good flags VID changes
n Channel 2 output from 1.3V to 6.0V
LINEAR SECTION
n Output voltage adjustable
n 50mA maximum driving current
n Output UVP
n ±2% initial tolerance
Applications
n Power supply for CPUs of notebook PCs that require
the SpeedStep™ technique
n Power supply for information appliances
n General low voltage DC/DC buck regulators
SpeedStep™ is a trademark of Intel Corporation.
© 2001 National Semiconductor Corporation DS200008
www.national.com
1 page  
5 www.national.com
5 Page 
Electrical Characteristics (Continued)
VCC = +15V unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply for TA
= TJ = +25˚C. Limits appearing in boldface type apply over 0˚C to +125˚C.
Symbol
Parameter
Conditions
Min Typ Max Units
Logic Inputs and Outputs
Vih Minimum High Level
Input Voltage (FPWM,
2.0 V
VID0-VID4)
Vil Maximum Low Level
Input Voltage (FPWM,
ON/SS1, ON/SS2,
0.8 V
VID0-VID4)
Ioh_pg
PGOOD Output High
Current
PGOOD = 5.7V (Note 23)
5 µA
Vol_pg
PGOOD Output Low
Voltage
PGOOD Sinking 20 µA
0.3 V
11 www.national.com
11 Page | ||
| Páginas | Total 40 Páginas | |
| PDF Descargar | [ Datasheet LM2633.PDF ] | |
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