IRNBPS1 International Rectifier, IRNBPS1 Datasheet - Page 2

• Manufacturer Part Number: IRNBPS1
• Description: KIT DESIGN PENTIUM II IRF7805/7
• Manufacturer: International Rectifier

Specifications of IRNBPS1

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IRNBPS1

International
Specifications
Circuit Description
The IRNBPS1 evaluation board provides a
digitally adjustable output voltage between
1.25V and 2V from a 10V to 24 V input
supply. The output voltage is digitally
adjusted by the MAX5480, a multiplying
digital to analog converter (DAC). Refer to
Table 2 for the DAC codes.
The IRF7805 and IRF7807 HEXFET Power
MOSFETs, as well as the MAX1636 control
IC are rated for 30V; however, the design kit
is restricted to 24V operating range due to
the ratings of other components and minimum
duty-factor limitations.
MOSFETs were specifically designed for
optimal efficiency at Vin = 14V, Vout = 1.6V,
and Iout = 5.6A, with a 10V-24V input
voltage swing, and Ioutmax = 7A (typical 4
cell Lithium-Ion operating conditions). All
components were chosen for 300kHz
switching frequency.
The MAX1636 Control IC has an internal
linear regulator for supplying its own VCC
power from the input voltage of the supply.
If a 5 volt bus or supply is available, it is
recommended to use the “optional +5V”
input, instead of the internal linear regulator.
Absolute Maximum Ra tings
Efficiency, T yp ical
Electrical Input Specifications
Power O utput Specifications
Digital Input/O utput Specifications
Output F ault Pro tection
Param eter
Input Voltage
Digital I/O
Continuous Output Current
Param eter
PW M
Param eter
Input Voltage
Input Current
Param eter
Voltage Range
Output Current
Voltage Regulation
Signal
PGD, O N/OFF, DO -D3, SKIP, SYNC
Param eter
Ov er Voltage
Ov er Current
Under Voltage
peak, V
@ I
out
Rectifier
= 5.6A, Vout = 1.6V, Fixed
out
= 1.6V, Fixed PW M
The power
(all specified line and load conditio ns)
V
in
1.25
M in
M in
86.8
10
M in
-0.3
M in
0
= 10V
-
90
-
+4
60
8
-
-
Input/Output
This will decrease gate drive power losses
and increase efficiency. To use this option,
disconnect pin 13 from its pad or cut the
trace, connect jumper JU6, then connect the
+5V supply to either the connector pins A4,
A5, B4 or to the +5V test point.
Jumper Description
(Recommended)
T able 1
input
Location
Location
Pin 1, 2
Pin 3, 4
Location
Shunt
Shunt
Table 3: Jumper JU1 Functions
Table 4: Jumper JU2 Functions
Table 5: Jumper JU3 Functions
OFF
OFF
ON
Shunt
OFF
ON
V
1.60
0.20
Typ
Typ
.64
5.6
in
14
88.5
85.8
= 14V
Typ
+7
10
70
+6.0
M ax
30.0
8.5
MAX1636
MAX1636
SKIP Pin
Gain Pin
VCC
GND
Conditions/Description
VCC
GND
REF
MAX1636
SYNC Pin
GND
VCC
M ax
M ax
2.0
2.0
7.0
24
V
1
in
M ax
83.5
+10
Low-noise mode,
fixed frequency PWM
operation.
Idle mode, pulse
skipping operation, for
highest light-load
efficiency
= 24V
12
80
82
Logic
0.5% AC Regulation
1% AC Regulation
2% AC Regulation
Operating
Units
Operating
Units
Mode
V
V
A
Units
Mode
Frequency
%
V
A
Units
V
A
Units
(kHz)
%
%
A
300
200
%
%
The MAX1636 contains a latched fault-
protection circuit that disables the IC when
the output is over-voltage or under-voltage
(or when thermal shutdown is triggered).
Once disabled, the supply won’t attempt to
restart until input power is cycled or until
SHDN(JU5) is cycled. A fault condition
can be triggered by overloading the output,
over-voltaging the output (which can
happen when changing the DAC code
settings), or by touching sensitive
compensation or feedback nodes.
1 0
1 2
1 3
1 4
1 5
1 1
Location
#
0
1
2
3
4
5
6
7
8
9
Location
Shunt
Shunt
Table 6: Jumper JU4 Functions
OFF
OFF
Table 7: Jumper JU5 Functions
ON
ON
D 3
Latched Fault Protection
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table 2. VID Codes
D 2
MAX1636
0
0
0
0
1
1
1
1
0
0
MAX1636
SHDN Pin
0
0
1
1
1
1
OVP Pin
GND
VIN
VCC
GND
D 1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
IRNBPS1
Shutdown mode,
V
Over-Voltage
D 0
out
Disabled
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Protection
Enabled
=0V
MAX1636
Enabled
Output
V o u t
1 . 9 5
1 . 8 5
1 . 7 5
1 . 6 5
1 . 5 5
1 . 4 5
1 . 3 5
1 . 2 5
2 . 0
1 . 9
1 . 8
1 . 7
1 . 6
1 . 5
1 . 4
1 . 3
2