ht82p604b Holtek Semiconductor Inc., ht82p604b Datasheet - Page 3

• Manufacturer Part Number: ht82p604b
• Description: Dc-dc Converter
• Manufacturer: Holtek Semiconductor Inc.

Absolute Maximum Ratings
Supply Voltage ......................................... +15V
Input Voltage ............... GND-0.3 to V
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-
Pin No.
12
13
14
15
16
17
18
19
20
mum Ratings² may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo-
sure to extreme conditions may affect device reliability.
PGOOD
PHASE
UGATE
BOOT
PGND
LGATE
VCC
OVP
RT
Pin Name
I/O
O
O
O
O
O
P
P
I
I
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. Exception to this behavivor is the ¢11111¢ VID pin com-
bination which disables the converter; in this case, PGOOD as-
serts a high level.
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.
Connect UGATE to the upper MOSFET gate. This pin provides
the gate drive for the upper MOSFET.
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.
This is the power ground connection. Tie the lower MOSFET
source to this pin.
Connect LGATE to the lower MOSFET gate. This pin provides
the gate drive for the lower MOSFET.
Provide a 12V bias supply for the chip to this pin.
The OVP pin can be used to drive an external SCR in the event
of an overvoltage condition.
This pin provides oscillator switching frequency adjustment. By
placing a resistor (R
200kHz switching frequency is increased.
F
Conversely, connecting a pull-up resistor (R
VCC reduces the switching frequency.
F
S
S
» 200kHz +
» 200kHz +
CC
Preliminary
+0.3V
3
R (k )
R (k )
4 10
5 10
Storage Temperature ............... -50°C to 125°C
Operating Temperature ............ -20°C to 75°C
T
T
´
´
W
W
6
7
T
) from this pin to GND, the nominal
(R
(R
Description
T
T
to GND)
to 12V)
T
) from this pin to
HT82P604B
March 23, 2000