HIP6004ECBZ datasheet(10/13 Pages) INTERSIL

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within their maximum junction temperature at high ambient

temperature by calculating the temperature rise according to

package thermal-resistance specifications. A separate heatsink

may be necessary depending upon MOSFET power, package

type, ambient temperature and air flow.

Standard-gate MOSFETs are normally recommended for

use with the HIP6004E. However, logic-level gate MOSFETs

can be used under special circumstances. The input voltage,

upper gate drive level, and the MOSFET’s absolute gate-to-

source voltage rating determine whether logic-level

MOSFETs are appropriate.

Figure 9 shows the upper gate drive (BOOT pin) supplied by a

bootstrap circuit from VCC. The boot capacitor, CBOOT

develops a floating supply voltage referenced to the PHASE

pin. This supply is refreshed each cycle to a voltage of VCC

less the boot diode drop (VD) when the lower MOSFET, Q2

turns on. Logic-level MOSFETs can only be used if the

MOSFET’s absolute gate-to-source voltage rating exceeds

the maximum voltage applied to VCC.

Figure 10 shows the upper gate drive supplied by a direct

connection to VCC. This option should only be used in

converter systems where the main input voltage is +5VDC or

less. The peak upper gate-to-source voltage is approximately

VCC less the input supply. For +5V main power and +12VDC

for the bias, the gate-to-source voltage of Q1 is 7V. A logic-

level MOSFET is a good choice for Q1 and a logic-level

MOSFET can be used for Q2 if its absolute gate-to-source

voltage rating exceeds the maximum voltage applied to VCC.

PUPPER = Io

2 x r

DS(ON) x D +

Io x VIN x tSW x FS

PLOWER = Io

2 x r

DS(ON) x (1 - D)

Where: D is the duty cycle = VOUT / VIN,

tSW is the switch ON time, and

FS is the switching frequency.

+12V

PGND

HIP6004E

GND

LGATE

UGATE

PHASE

BOOT

VCC

+5V OR +12V

NOTE:

VG-S ≈ VCC

CBOOT

DBOOT

FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION

VG-S ≈ VCC -VD

+ VD -

+12V

PGND

HIP6004E

GND

LGATE

UGATE

PHASE

BOOT

+5V OR LESS

NOTE:

VG-S ≈ VCC

FIGURE 10. UPPER GATE DRIVE - DIRECT VCC DRIVE OPTION

VG-S ≈ VCC -5V

HIP6004E

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