ISL9440C datasheet(5/11 Pages) INTERSIL

Part #	ISL9440C

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

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Manufacturer	INTERSIL [Intersil Corporation]

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

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5 / 11 page

5

AN1482.0

June 30, 2009

FIGURE 9. PWM2 OUTPUT RIPPLE UNDER MAX LOAD

(VIN = 12V, IO1 = IO2 = 6A, IO3 = 4A, FULL

BANDWIDTH)

FIGURE 10. PWM3 OUTPUT RIPPLE UNDER MAX LOAD

(VIN = 12V, IO1 = IO2 = 6A, IO3 = 4A, FULL

BANDWIDTH)

FIGURE 11. PWM1 LOAD TRANSIENT RESPONSE

(LOAD STEP FROM 1.5A TO 4.5A)

FIGURE 12. PWM2 LOAD TRANSIENT RESPONSE

(LOAD STEP FROM 1.5A TO 4.5A)

FIGURE 13. PWM3 LOAD TRANSIENT RESPONSE

(LOAD STEP FROM 1A TO 3A)

FIGURE 14. SOFT START WAVEFORMS

Typical Evaluation Board Performance Curves

VIN = 12V, Unless Otherwise Noted. (Continued)

VOUT2(AC), 50mV/DIV

500ns/DIV

VOUT3(AC), 50mV/DIV

500ns/DIV

VOUT1(AC), 50mV/DIV

ISTEP, 2A/DIV

50µs/DIV

VOUT2(AC, 100mV/DIV)

ISTEP, 2A/DIV

50µs/DIV

VOUT3(AC), 100mV/DIV

ISTEP, 1A/DIV

50µs/DIV

VOUT1, 1V/DIV

VOUT2, 2V/DIV

VOUT4, 2V/DIV

VOUT3, 2V/DIV

1ms/DIV

Application Note 1482

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