ht82p604b Holtek Semiconductor Inc., ht82p604b Datasheet

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ht82p604b

Manufacturer Part Number
ht82p604b
Description
Dc-dc Converter
Manufacturer
Holtek Semiconductor Inc.
Datasheet
Preliminary
Features
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Applications
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General Description
The HT82P604B provides complete control and
protection for a DC-DC converter optimized for
high performance microprocessor applications.
It is designed to drive two N-Channel
MOSFETs in a synchronous-rectified buck to-
pology. The HT82P604B integrates all of the
control, output adjustment, monitoring and
protection functions into a single package.
The output voltage of the converter is easily ad-
justed and precisely regulated. The HT82P604B
includes a 5-input digital-to-analog converter
(DAC) that adjusts the output voltage from 2.1V
to 3.5V in 0.1V increments and from 1.3V to
2.05V in 0.05V steps. The precision reference
and voltage-mode regulator hold the selected
output voltage to within ±1% over temperature
and line voltage variations.
The HT82P604B provides simple, single feed-
back loop, voltage-mode control with fast tran-
Pentium is a trademark of Intel Corporation
Operating voltage: 5V~12V
Drives two N-Channel MOSFETs
Simple single-loop control design
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Fast transient response
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Excellent output voltage regulation
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Power supply for Pentium
Pro, PowerPC
sors
Voltage-mode PWM control
High-bandwidth error amplifier
Full 0% to 100% duty ratio
±1% over line voltage and temperature
TM
and Alpha
TM
TM
, Pentium
Microproces-
TM
1
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s i e n t r e s p o n s e . I t i n c l u d e s a 2 0 0 k H z
free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz.
The error amplifier features a 15MHz
gain-bandwidth product and 6V/ms slew rate
which enables high converter bandwidth for
fast transient performance. The resulting
PWM duty ratio ranges from 0% to 100%.
The HT82P604B monitors the output voltage
with a window comparator that tracks the DAC
output and issues a Power Good signal when
the output is within ±10%. The HT82P604B
protects against over-current conditions by in-
hibiting PWM operation. Built-in over-voltage
protection triggers an external SCR to crowbar
the input supply. The HT82P604B monitors the
current by using the r
MOSFET which eliminates the need for a cur-
rent sensing resistor.
5 bit digital-to-analog output voltage selection
Power-good output voltage monitor
Over-voltage and over-current sensing ele-
ment, uses MOSFET¢s r
Small converter size
High-power5Vto3.xVDC-DCregulators
Low-voltage distributed power supplies
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Wide range -1.3V to 3.5V
0.1V binary steps from 2.1V to 3.5V
0.05V binary steps from 1.3V to 2.05V
Constant frequency operation
200kHz free-running oscillator program-
mable from 50kHz to over 1MHz
DC-DC Converter
HT82P604B
DS (ON)
DS (ON)
March 23, 2000
of the upper

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ht82p604b Summary of contents

Page 1

... The HT82P604B monitors the output voltage with a window comparator that tracks the DAC output and issues a Power Good signal when the output is within ±10%. The HT82P604B protects against over-current conditions by in- hibiting PWM operation. Built-in over-voltage protection triggers an external SCR to crowbar the input supply ...

Page 2

... Signal ground for the IC. All voltage levels are measured with 11 GND P respect to this pin. Preliminary Description ) from this pin to the drain of the up- OCSET , an internal 200mA current source OCSET ), and the upper MOSFET on-resistance ( ´ OCS OCSET = r DS(ON) 2 HT82P604B ) set the DS (ON) March 23, 2000 ...

Page 3

... GND, the nominal ´ » 200kHz + (R to GND ´ » 200kHz + (R to 12V Storage Temperature ............... -50°C to 125°C +0.3V Operating Temperature ............ -20°C to 75° HT82P604B ) from this pin to T March 23, 2000 ...

Page 4

... LGATE 12V V =12V, V =6V 300 CC LGATE 12V I =0.3V ¾ LGATE 12V ¾ 12V V =4.5V 170 OCSET DC 12V V =5.5, V =0V 60 SEN OVP 12V ¾ 12V V Rising 106 SEN 4 HT82P604B 5 mA ¾ 10.4 V ¾ V ¾ ¾ 1.26 V ¾ 200 215 kHz +15 % ¾ 1.9 V ¾ P-P +1.0 % ¾ ¾ 15 MHz ¾ ...

Page 5

... V PGOOD Voltage Low PGOOD Functional Description Output voltage program The output voltage of a HT82P604B converter is programmed to discrete levels between 1.3V and 3.5V. The voltage identification (VID) pins program an internal voltage reference (DACOUT) with a 5-bit digital-to-analog con- verter (DAC). The level of DACOUT also sets the PGOOD and OVP thresholds ...

Page 6

... HT82P604B March 23, 2000 ...

Page 7

... Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. Preliminary 7 HT82P604B March 23, 2000 ...

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