ISL9440A datasheet(3/14 Pages) INTERSIL

Part #	ISL9440A

Description	Triple PWM Step-Down Synchronous Buck Controller and One LDO

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Manufacturer	INTERSIL [Intersil Corporation]

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AN1454.0

September 25, 2009

Load Transient Circuit Set-up

1. Select a DPAK N channel MOSFET with VDSS

breakdown > 20V.

2. Install the load transient circuit as indicated on the

schematic. Refer to Figure 3 for details.

3. R12, R14, R16 are 10k

Ω resistors for discharging the

MOSFET gates.

4. R13, R15 and R17 are current sensing resistors to

monitor the load step. For accurate measurement, please

use 5% tolerance sensing resistor or better. To alleviate

thermal stress, use 0.1

Ω or smaller resistance. The

resistance of the sensing resistors sets the current scale

on the oscilloscope.

5. Apply pulse square waveform to the ISTEP_CLK1,

ISTEP_CLK2 and ISTEP_CLK3. The duty cycle of the

pulse waveform should be small (<5%) to limit thermal

stress on current sensing resistor and the MOSFETs (Q8,

Q9 and Q10

6. The amplitude of the clock sets the current step

amplitude. Adjust the clock amplitude and slew rate to set

the current step and slew rate.

7. Monitor overshoot and undershoot at corresponding

output.

FIGURE 2. PROPER PROBE SET-UP TO MEASURE OUTPUT

RIPPLE AND PHASE NODE RINGING.

OUTPUT CAP

OR MOSFET

OUTPUT CAP

OR MOSFET

OUTPUT CAP

OR MOSFET

FIGURE 3. LOAD TRANSIENT CIRCUIT FOR PWM1

J17

R15

OPT, 0.01

R14

OPT, 10k

J18

ISTEP1

Q10

OPT, SUD50N03-16P

Typical Evaluation Board Performance Curves

VIN = 9V, unless otherwise specified.

FIGURE 4. PWM1 EFFICIENCY vs LOAD (VO = 5.0V)

FIGURE 5. PWM2 EFFICIENCY vs LOAD (VO = 3.3V)

60

65

70

75

80

85

90

95

100

0

4

6

8

10

12

14

16

LOAD CURRENT (A)

VIN = 23VDC

2

VIN = 19VDC

VIN = 16VDC

60

65

70

75

80

85

90

95

100

0

8

10

12

14

16

LOAD CURRENT (A)

24

6

VIN = 16VDC

VIN = 19VDC

VIN = 23VDC

Application Note 1454

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