ISPPAC-POWR1208-01TN44I LATTICE SEMICONDUCTOR, ISPPAC-POWR1208-01TN44I Datasheet - Page 21

• Manufacturer Part Number: ISPPAC-POWR1208-01TN44I
• Description: ISP CONTROLLER, 1208, TQFP44, 5V
• Manufacturer: LATTICE SEMICONDUCTOR

Specifications of ISPPAC-POWR1208-01TN44I

• Input Voltage: 2.7V To 5.5V
• Digital Ic Case Style: TQFP
• No. Of Pins: 44
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Operating Temperature Max: 85°C
• Operating Temperature: RoHS Compliant

Lattice Semiconductor
Figure 10. Gate and Source Voltage Responses for a 3.3V Supply
MOSFET gate capacitance ranges from hundreds to thousands of picoFarads. Refer to the MOSFET manufac-
turer’s data sheet for values of Cgs (Capacitance gate-to-source). If slower ramps are required, an additional exter-
nal low leakage capacitor (e.g. a polycarbonate or other poly type capacitor) can be added from the gate to ground.
As a good design practice, it is recommended that a series resistor of 10-100Ω be placed in the gate drive signal
near the FET gate pin to reduce the possibility that the FET may self-oscillate.
Charge Pump
Four internal charge pumps are provided to fully support external N-channel FET devices. No external components
are required for the charge pumps. The output voltage is programmable from 8 to 12V in 0.5V steps. The user must
select a high voltage limit no greater than 7.5V above V
trolled with an on-chip feedback loop, and is independent of the actual supply voltage.
Programmable Output Voltage Levels for HVOUT1- HVOUT4
There are eight selectable steps for the output voltage of the FET drivers when in FET driver mode. The output pins
HVOUT1-4 are current source outputs, each with a programmable current. The current is programmable in 32 dif-
ferent steps ranging from 0.5µA to 50µA. The voltage that the pin is capable of driving to is listed in Table 6. For
each supply range, the charge-pump range will be set by the software.
Table 6. HVOUT Gate Driver Voltage Range
V
DD
8.5
9.5
10
= 3.3V
8
9
21
DD
(the software assists this process). This voltage is con-
V
DD
10.5
8.5
9.5
10
11
12
8
9
= 5V
ispPAC-POWR1208P1 Data Sheet