Document
DATASHEET
HIP6005B
Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor
FN4568 Rev 2.00 February 1999
The HIP6005B provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive an N-Channel MOSFET in a standard buck topology. The HIP6005B integrates all of the control, output adjustment, monitoring and protection functions into a single package.
The output voltage of the converter is easily adjusted and precisely regulated. The HIP6005B includes a fully TTL-compatible 5-input digital-to-analog converter (DAC) that adjusts the output voltage from 1.3VDC to 2.05VDC in 0.05V increments and from 2.1VDC to 3.5VDC in 0.1V steps. The precision reference and voltage-mode regulator hold the selected output voltage to within 1% over temperature and line voltage variations.
The HIP6005B provides simple, single feedback loop, voltagemode control with fast transient response. It includes a 200kHz 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/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 100%.
The HIP6005B 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 HIP6005B protects against over-current and over-voltage conditions by inhibiting PWM operation. Additional built-in over-voltage protection triggers an external SCR to crowbar the input supply. The HIP6005B monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
Ordering Information
TEMP. PART NUMBER RANGE (oC)
PACKAGE
PKG. NO.
HIP6005BCB
0 to 70 20 Ld SOIC
M20.3
HIP6005BCV
0 to 70 20 Ld TSSOP
M20.173
NOTE: When ordering, use the entire part number. Add the suffix T to obtain the TSSOP variant in tape and reel, e.g., HIP6005BCV-T.
Features
• Drives N-Channel MOSFET
• Operates from +5V or +12V Input
• Simple Single-Loop Control Design - Voltage-Mode PWM Control
• Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation - 1% Over Line Voltage and Temperature
• TTL-Compatible 5-Bit Digital-to-Analog Output Voltage Selection - Wide Range . . . . . . . . . . . . . . . . . . . 1.3VDC to 3.5VDC - 0.1V Binary Steps . . . . . . . . . . . . . . 2.1VDC to 3.5VDC - 0.05V Binary Steps . . . . . . . . . . . . 1.3VDC to 2.05VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors - Does Not Require Extra Current Sensing Element, Uses MOSFET’s rDS(ON)
• Small Converter Size - Constant Frequency Operation - 200kHz Free-Running Oscillator Programmable from 50kHz to over 1MHz
Applications
• Power Supply for Pentium®, Pentium Pro, Pentium II, PowerPC™, K6™, 6X86™ and Alpha™ Microprocessors
• High-Power 5V to 3.xV DC-DC Regulators • Low-Voltage Distributed Power Supplies
Pinout
HIP6005B (SOIC, TSSOP)
TOP VIEW
VSEN 1 OCSET 2
SS 3 VID0 4 VID1 5 VID2 6 VID3 7 VID4 8 COMP 9
FB 10
20 RT 19 OVP 18 VCC 17 NC 16 NC 15 BOOT 14 UGATE 13 PHASE 12 PGOOD 11 GND
6X86™ is a trademark of Cyrix Corporation. Alpha Micro™ is a trademark of Digital Computer Equipment Corporation
K6™ is a trademark of Advanced Micro Devices. Pentium® is a registered trademark of Intel Corporation.
PowerPC™ is a registered trademark of IBM.
FN4568 Rev 2.00 February 1999
Page 1 of 11
HIP6005B
Typical Application
+12V
VCC
PGOOD
SS OVP
RT
VID0 VID1 VID2 VID3 VID4
FB
MONITOR AND PROTECTION
OSC
D/A HIP6005B
+- +-
COMP
VSEN
OCSET BOOT UGATE PHASE
GND
VIN = +5V OR +12V +VOUT
Block Diagram
VSEN
OCSET
VID0 VID1 VID2 VID3 VID4
FB COMP
RT
REFERENCE
D/A CONVERTER
(DAC)
VCC
110% 90% 115%
200A
+
-
+
-
OVERVOLTAGE +
-
+
- OVER-
CURRENT
4V
POWER-ON RESET (POR)
SOFTSTART
10A
DACOUT
+-
ERROR AMP
PWM COMPARATOR
+-
INHIBIT PWM
GATE CONTROL
LOGIC
OSCILLATOR
PGOOD
OVP SS BOOT UGATE PHASE
GND
FN4568 Rev 2.00 February 1999
Page 2 of 11
HIP6005B
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+15V Boot Voltage, VBOOT - VPHASE . . . . . . . . . . . . . . . . . . . . . . . .+15V Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to VCC +0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Operating Conditions
Supply Voltage, VCC . Ambient Temperature
...... Range.
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+12V 10% 0oC to 70oC
Thermal Information
Thermal Resistance (Typical, Note 1)
JA (oC/W)
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SOIC Package (with 3in2 of Copper) . . . . . . . . . ..