DATASHEET
HIP6004
Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor
The HIP6004 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
topology. The HIP6004 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 HIP6004 includes a 5-input
digital-to-analog converter (DAC) that adjusts the output
voltage from 2.1V
DC
to 3.5V
DC
in 0.1V increments and from
1.3V
DC
to 2.1V
DC
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 HIP6004 provides simple, single feedback loop,
voltage-mode 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 HIP6004 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 HIP6004
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6004
monitors the current by using the r
DS(ON)
of the upper
MOSFET which eliminates the need for a current sensing
resistor.
FN4275
Rev.2.00
March 2000
Features
• Drives Two N-Channel MOSFETs
• 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
• 5-Bit Digital-to-Analog Output Voltage Selection
- Wide Range . . . . . . . . . . . . . . . . . . . 1.3V
DC
to 3.5V
DC
- 0.1V Binary Steps . . . . . . . . . . . . . . . 2.1V
DC
to 3.5V
DC
- 0.05V Binary Step. . . . . . . . . . . . . . . 1.3V
DC
to 2.1V
DC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element,
Uses MOSFETs r
DS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to over 1MHz
Applications
• Power Supply for Pentium®, Pentium Pro, PowerPC™
and Alpha™ Microprocessors
• High-Power 5V to 3.xV DC-DC Regulators
• Low-Voltage Distributed Power Supplies
Ordering Information
PART NUMBER
HIP6004CB
TEMP.
RANGE (
o
C)
0 to 70
PACKAGE
20 Ld SOIC
PKG.
NO.
M20.3
Pinout
HIP6004
(SOIC)
TOP VIEW
VSEN
OCSET
SS
VID0
VID1
VID2
VID3
VID4
COMP
1
2
3
4
5
6
7
8
9
20 RT
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
This data sheet describes a pre-released product
.
FB 10
FN4275 Rev.2.00
March 2000
Page 1 of 12
HIP6004
Typical Application
+12V
PGOOD
SS
OVP
RT
VID0
VID1
VID2
VID3
VID4
FB
OSC
MONITOR AND
PROTECTION
VCC
OCSET
EN
BOOT
V
IN
= +5V or +12V
UGATE
PHASE
+V
OUT
HIP6004
D/A
+
+
-
LGATE
PGND
VSEN
GND
-
COMP
Block Diagram
VCC
VSEN
110%
+
POWER-ON
RESET (POR)
-
-
-
-
PGOOD
90%
+
115%
+
+
OVER-
CURRENT
4V
PWM
COMPARATOR
+
OVER-
VOLTAGE
10A
OVP
SOFT-
START
SS
BOOT
UGATE
PHASE
VID0
VID1
VID2
VID3
VID4
FB
COMP
RT
OSCILLATOR
D/A
CONVERTER
(DAC)
DACOUT
GATE
INHIBIT CONTROL
LOGIC
PWM
LGATE
PGND
GND
OCSET
REFERENCE
200A
-
+
-
ERROR
AMP
FN4275 Rev.2.00
March 2000
Page 2 of 12
HIP6004
Absolute Maximum Ratings
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+15V
Boot Voltage, V
BOOT
- V
PHASE
. . . . . . . . . . . . . . . . . . . . . . . .+15V
Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance (Typical, Note 1)
JA
(
o
C/W)
Operating Conditions
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . +12V
10%
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . 0
o
C to 70
o
C
Junction Temperature Range. . . . . . . . . . . . . . . . . . . . 0
o
C to 125
o
C
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
118
Maximum Junction Temperature (Plastic Package) . . . . . . . .150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300
o
C
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief 379 for details.
Electrical Specifications
PARAMETER
VCC SUPPLY CURRENT
Nominal Supply
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
Rising V
OCSET
Threshold
OSCILLATOR
Free Running Frequency
Total Variation
Ramp Amplitude
REFERENCE AND DAC
DACOUT Voltage Accuracy
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
Slew Rate
GATE DRIVERS
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PROTECTION
Recommended Operating Conditions, Unless Otherwise Noted
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
I
CC
UGATE and LGATE Open
-
5
-
mA
V
OCSET
= 4.5V
V
OCSET
= 4.5V
-
8.2
-
-
-
1.26
10.4
-
-
V
V
V
RT = OPEN
6k < RT to GND < 200k
V
OSC
RT = Open
185
-15
-
200
-
1.9
215
+15
-
kHz
%
V
P-P
%
-1.0
-
+1.0
-
GBW
SR
COMP = 10pF
-
-
88
15
6
-
-
-
dB
MHz
V/s
I
UGATE
R
UGATE
I
LGATE
R
LGATE
V
BOOT
- V
PHASE
= 12V, V
UGATE
= 6V
I
LGATE
= 0.3A
VCC = 12V, V
LGATE
= 6V
I
LGATE
= 0.3A
350
-
300
-
500
5.5
450
3.5
-
10
-
6.5
mA
mA
Over-Voltage Trip (V
SEN
/DACOUT)
OCSET Current Source
OVP Sourcing Current
Soft Start Current
POWER GOOD
Upper Threshold (V
SEN
/ DACOUT)
Lower Threshold (V
SEN
/ DACOUT)
Hysteresis (VSEN / DACOUT)
PGOOD Voltage Low
V
PGOOD
VSEN Rising
VSEN Falling
Upper and Lower Threshold
I
PGOOD
= -5mA
I
OCSET
I
OVP
I
SS
V
OCSET
= 4.5V
DC
V
SEN
= 5.5V, V
OVP
= 0V
-
170
60
-
115
200
-
10
120
230
-
-
%
A
mA
A
106
89
-
-
-
-
2
0.5
111
94
-
-
%
%
%
V
FN4275 Rev.2.00
March 2000
Page 3 of 12
HIP6004
Typical Performance Curves
80
70
1000
RESISTANCE (k)
R
T
PULLUP
TO +12V
I
CC
(mA)
60
50
40
C
GATE
= 1000pF
30
10
R
T
PULLDOWN TO V
SS
20
10
10
100
SWITCHING FREQUENCY (kHz)
1000
0
100
200
C
GATE
= 10pF
C
UPPER
= C
LOWER
= C
GATE
C
GATE
= 3300pF
100
300
400
500
600
700
800
SWITCHING FREQUENCY (kHz)
900
1000
FIGURE 1. R
T
RESISTANCE vs FREQUENCY
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
Functional Pin Description
VSEN
OCSET
SS
VID0
VID1
VID2
VID3
VID4
COMP
1
2
3
4
5
6
7
8
9
20 RT
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
VID0-4 (Pins 4-8)
VID0-4 are the input pins to the 5-bit DAC. The states of these
five pins program the internal voltage reference (DACOUT).
The level of DACOUT sets the converter output voltage. It also
sets the PGOOD and OVP thresholds. Table 1 specifies
DACOUT for the 32 combinations of DAC inputs.
COMP (Pin 9) and FB (Pin 10)
COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the error amplifier
and the COMP pin is the error amplifier output. These pins are
used to compensate the voltage-control feedback loop of the
converter.
FB 10
GND (Pin 11)
VSEN (Pin 1)
This pin is connected to the converters output voltage. The
PGOOD and OVP comparator circuits use this signal to report
output voltage status and for overvoltage protection.
Signal ground for the IC. All voltage levels are measured with
respect to this pin.
PGOOD (Pin 12)
PGOOD is an open collector output used to indicate the status
of the converter output voltage. This pin is pulled low when the
converter output is not within
10%of
the DACOUT reference
voltage.
OCSET (Pin 2)
Connect a resistor (R
OCSET
) from this pin to the drain of the
upper MOSFET. R
OCSET
, an internal 200A current source
(I
OCS
), and the upper MOSFET on-resistance (r
DS(ON)
) set
the converter over-current (OC) trip point according to the
following equation:
I
OCS
R
OCSET
I
PEAK
= -------------------------------------------
-
r
DS
ON
PHASE (Pin 13)
Connect the PHASE pin to the upper MOSFET source. This
pin is used to monitor the voltage drop across the MOSFET for
over-current protection. This pin also provides the return path
for the upper gate drive.
UGATE (Pin 14)
Connect UGATE to the upper MOSFET gate. This pin provides
the gate drive for the upper MOSFET.
An over-current trip cycles the soft-start function.
SS (Pin 3)
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 10A current source, sets the soft-start
interval of the converter.
BOOT (Pin 15)
This pin provides bias voltage to the upper MOSFET driver. A
bootstrap circuit may be used to create a BOOT voltage
suitable to drive a standard N-Channel MOSFET.
FN4275 Rev.2.00
March 2000
Page 4 of 12
HIP6004
PGND (Pin 16)
This is the power ground connection. Tie the lower MOSFET
source to this pin.
charge the output capacitor(s). This interval of increasing pulse
width continues to t
2
. With sufficient output voltage, the clamp on
the reference input controls the output voltage. This is the interval
between t
2
and t
3
in Figure 3. At t
3
the SS voltage exceeds the
DACOUT voltage and the output voltage is in regulation. This
method provides a rapid and controlled output voltage rise. The
PGOOD signal toggles ‘high’ when the output voltage (VSEN pin)
is within
5%
of DACOUT. The 2% hysteresis built into the power
good comparators prevents PGOOD oscillation due to nominal
output voltage ripple.
LGATE (Pin 17)
Connect LGATE to the lower MOSFET gate. This pin provides
the gate drive for the lower MOSFET.
VCC (Pin 18)
Provide a 12V bias supply for the chip to this pin.
OVP (Pin 19)
The OVP pin can be used to drive an external SCR in the
event of an overvoltage condition.
PGOOD
(2V/DIV.)
0V
RT (Pin 20)
This pin provides oscillator switching frequency adjustment. By
placing a resistor (R
T
) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
5
10
-
Fs
200kHz
+ --------------------
R
T
k
6
SOFT-START
(1V/DIV.)
OUTPUT
VOLTAGE
(1V/DIV.)
(R
T
to GND)
0V
0V
t
1
t
2
TIME (5ms/DIV.)
t
3
Conversely, connecting a pull-up resistor (R
T
) from this pin to
VCC reduces the switching frequency according to the
following equation:
4
10
Fs
200kHz
– --------------------
-
R
T
k
7
(R
T
to 12V)
FIGURE 3. SOFT START INTERVAL
Functional Description
Initialization
The HIP6004 automatically initializes upon receipt of power.
Special sequencing of the input supplies is not necessary. The
Power-On Reset (POR) function continually monitors the input
supply voltages. The POR monitors the bias voltage at the
VCC pin and the input voltage (V
IN
) on the OCSET pin. The
level on OCSET is equal to V
IN
less a fixed voltage drop (see
over-current protection). The POR function initiates soft start
operation after both input supply voltages exceed their POR
thresholds. For operation with a single +12V power source, V
IN
and V
CC
are equivalent and the +12V power source must
exceed the rising V
CC
threshold before POR initiates
operation.
Over-Current Protection
The over-current function protects the converter from a shorted
output by using the upper MOSFETs on-resistance, r
DS(ON)
to
monitor the current. This method enhances the converter’s
efficiency and reduces cost by eliminating a current sensing
resistor.
SOFT-START
OUTPUT INDUCTOR
4V
2V
0V
15A
10A
5A
0A
Soft Start
The POR function initiates the soft start sequence. An internal
10A current source charges an external capacitor (C
SS
) on the
SS pin to 4V. Soft start clamps the error amplifier output (COMP
pin) and reference input (+ terminal of error amp) to the SS pin
voltage. Figure 3 shows the soft start interval with C
SS
= 0.1F.
Initially the clamp on the error amplifier (COMP pin) controls the
converter’s output voltage. At t
1
in Figure 3, the SS voltage
reaches the valley of the oscillator’s triangle wave. The oscillator’s
triangular waveform is compared to the ramping error amplifier
voltage. This generates PHASE pulses of increasing width that
TIME (20ms/DIV.)
FIGURE 4. OVER-CURRENT OPERATION
The over-current function cycles the soft-start function in a hiccup
mode to provide fault protection. A resistor (R
OCSET
) programs
the over-current trip level. An internal 200A current sink develops
a voltage across R
OCSET
that is referenced to V
IN
. When the
voltage across the upper MOSFET (also referenced to V
IN
)
exceeds the voltage across R
OCSET
, the over-current function
FN4275 Rev.2.00
March 2000
Page 5 of 12
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
