ISL6402IV-T datasheet(10/19 Pages) INTERSIL

Part #	ISL6402IV-T

Description	300kHz Dual, 180 Degree Out-of-Phase, Step-Down PWM and Single Linear Controller

Download	19 Pages

Scroll/Zoom	100%

Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

Logo

10 / 19 page

10

FN9123.3

November 8, 2004

Pin Descriptions

BOOT2, BOOT1 - These pins power the upper MOSFET

drivers of each PWM converter. Connect this pin to the

junction of the bootstrap capacitor and the cathode of the

bootstrap diode. The anode of the bootstrap diode is

connected to the VCC_5V pin.

UGATE2, UGATE1 - These pins provide the gate drive for

the upper MOSFETs.

PHASE2, PHASE1 - These pins are connected to the junction

of the upper MOSFETs source, output filter inductor and lower

MOSFETs drain.

LGATE2, LGATE1 - These pins provide the gate drive for

the lower MOSFETs.

PGND - This pin provides the power ground connection for

the lower gate drivers for both PWM1 and PWM2. This pin

should be connected to the sources of the lower MOSFETs

and the (-) terminals of the external input capacitors.

FB3, FB2, FB1 - These pins are connected to the feedback

resistor divider and provide the voltage feedback signals for

the respective controller. They set the output voltage of the

converter. In addition, the PGOOD circuit uses these inputs

to monitor the output voltage status.

ISEN2, ISEN1 - These pins are used to monitor the voltage

drop across the lower MOSFET for current loop feedback

and overcurrent protection.

PGOOD - This is an open drain logic output used to indicate

the status of the output voltages. This pin is pulled low when

either of the two PWM outputs is not within 10% of the

respective nominal voltage, or if the linear controller output is

less than 75% of it’s nominal value.

SGND - (Pin 20 on the TSSOP; Pin 17 on the QFN)

This is the small-signal ground, common to all 3 controllers,

and must be routed separately from the high current ground

(PGND). All voltage levels are measured with respect to this

pin. Connect the additional SGND pins to this pin. If using a

5V supply, connect this pin to VCC_5V. A small ceramic

capacitor should be connected right next to this pin for noise

decoupling.

VIN - Use this pin to power the device with an external

supply voltage with a range of 5.6V to 24V. For 5V ±10%

operation, connect this pin to VCC_5V.

VCC_5V - This pin is the output of the internal 5V linear

regulator. This output supplies the bias for the IC, the low

side gate drivers, and the external boot circuitry for the high

side gate drivers. The IC may be powered directly from a

single 5V (±10%) supply at this pin. When used as a 5V

supply input, this pin must be externally connected to VIN.

The VCC_5V pin must be always decoupled to power

ground with a minimum of 4.7

µF ceramic capacitor, placed

very close to the pin.

SYNC - This pin may be used to synchronize two or more

ISL6402 controllers. This pin requires a 1K resistor to

ground if used; connect directly to VCC_5V if not used.

SS1, SS2 - These pins provide a soft-start function for their

respective PWM controllers. When the chip is enabled, the

regulated 5

µA pull-up current source charges the capacitor

connected from this pin to ground. The error amplifier

reference voltage ramps from 0 to 0.8V while the voltage on

the soft-start pin ramps from 0 to 0.8V.

SD1, SD2 - These pins provide an enable/disable function

for their respective PWM output. The output is enabled when

this pin is floating or pulled HIGH, and disabled when the pin

is pulled LOW.

GATE3 - This pin is the open drain output of the linear

regulator controller.

OCSET2, OCSET1 - A resistor from this pin to ground sets

the overcurrent threshold for the respective PWM.

Functional Description

General Description

The ISL6402 integrates control circuits for two synchronous

buck converters and one linear controller. The two

synchronous bucks operate out of phase to substantially

reduce the input ripple and thus reduce the input filter

requirements. The chip has four control lines (SS1, SD1,

SS2, and SD2), which provide independent control for each

of the synchronous buck outputs.

The buck PWM controllers employ a free-running frequency

of 300kHz. The current mode control scheme with an input

voltage feed-forward ramp input to the modulator provides

excellent rejection of input voltage variations and provides

simplified loop compensations.

The linear controller can drive either a PNP or PFET to

provide ultra low-dropout regulation with programmable

voltages.

Internal 5V Linear Regulator (Vcc_5V)

All ISL6402 functions are internally powered from an on-

chip, low dropout 5V regulator. The maximum regulator input

voltage is 24V. Bypass the regulator’s output (Vcc_5V) with

a 4.7µF capacitor to ground. The dropout voltage for this

LDO is typically 600mV, so when Vcc_5V is greater then

5.6V, Vcc_5V is typically 5V. The ISL6402 also employs an

undervoltage lockout circuit that disables both regulators

when Vcc_5V falls below 4.4V.

The internal LDO can source over 60mA to supply the IC,

power the low side gate drivers, charge the external boot

capacitor and supply small external loads. When driving

large FETs especially at 300kHz frequency, little or no

regulator current may be available for external loads.

ISL6402

Similar Part No. - ISL6402IV-T

Manufacturer	Part #	Datasheet	Description
Renesas Technology Corp	ISL6402IV-T	837Kb / 19P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller
Renesas Technology Corp	ISL6402IV-TK	837Kb / 19P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller

More results

Similar Description - ISL6402IV-T

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	ISL6443	397Kb / 18P	300kHz Dual, 180 Degree Out-of-Phase, Step-Down PWM and Single Linear Controller
	ISL6440	346Kb / 15P	300kHz Dual, 180 Degree Out-of-Phase, Step-Down PWM Controller
	ISL6443A	299Kb / 19P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller
	ISL6443	349Kb / 18P	300kHz Dual, 180째 Out-of-Phase, Step- Down PWM and Single Linear Controller
Renesas Technology Corp	ISL6443A	944Kb / 20P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller
	ISL6402	837Kb / 19P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller
	ISL6443	831Kb / 18P	300kHz Dual, 180째 Out-of-Phase, Step-Down PWM and Single Linear Controller
	ISL6402A	797Kb / 18P	1.4MHz Dual, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller Dec 1, 2004
Intersil Corporation	ISL6441	340Kb / 18P	1.4MHz Dual, 180 Out-of-Phase, Step-Down PWM and Single Linear Controller
Intersil Corporation	ISL6402A	390Kb / 18P	1.4MHz Dual, 180 Out-of-Phase, Step- Down PWM and Single Linear Controller

More results

ISL6402IV-T Datasheet(PDF) 10 Page - Intersil Corporation

ISL6402IV-T Datasheet(HTML) 10 Page - Intersil Corporation

Similar Part No. - ISL6402IV-T

Similar Description - ISL6402IV-T

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL