isl88550a Intersil Corporation, isl88550a Datasheet - Page 9

• Manufacturer Part Number: isl88550a
• Description: Synchronous Step Down Controller With Sourcing And Sinking Ldo Regulator
• Manufacturer: Intersil Corporation

Typical Operating Characteristics
V
I
DD
0.95
0.94
0.93
0.92
0.91
0.90
0.89
0.88
0.87
0.86
0.85
VDDQ
FIGURE 11. LOAD TRANSIENT (VTT -1.5A TO 1.5A)
= 5V, I
-0.04
FIGURE 9. VTTR REGULATION vs VTTR LOAD
= 12A, I
FIGURE 13. POWER-DOWN WAVEFORMS
VDDQ
-0.03
VTTR
= 12A, I
-0.02
= 15mA
VTT
20µs/DIV
100µs/DIV
-0.01
= 1.5A, I
LOAD (A)
9
0
VTTR
= 15mA
0.01
0.02
unless otherwise noted. (Continued)
V
IN
0.03
VTTR
100mV/DIV
2A/DIV
VDDQ
1V/DIV
VTT
1V/DIV
VTTR
1V/DIV
V
10V/DIV
VDDQ
100mV/DIV
VTT
100mV/DIV
I
VTT
IN
= 12V, V
0.04
ISL88550A
DDQ
= 1.8V, t
10A
0A
FIGURE 14. VDDQ START-UP AND SHUTDOWN INTO HEAVY
I
ON
VDDQ
V
I
VTT
DD
= GND, SKIP# = AV
= 5V, I
= 1.5A, I
= 12A, I
FIGURE 10. LOAD TRANSIENT (VDDQ)
FIGURE 12. POWER-UP WAVEFORMS
VDDQ
LOAD, DISCHARGE DISABLED
VTT
VTTR
= 12A, I
= 1.5A
= 15mA
100µs/DIV
1ms/DIV
20µs/DIV
VTT
DD
, circuit of Figure 29, T
= 1.5A, I
VTTR
= 15mA
A
= +25°C,
October 1, 2007
VTTR
100mV/DIV
VTTR
1V/DIV
10A/DIV
VDDQ
1V/DIV
VTT
1V/DIV
V
10V/DIV
VDDQ
100mV/DIV
VTT
100mV/DIV
I
VDDQ
1V/DIV
VTT
500mV/DIV
POK1
5V/DIV
SHDNA#
5V/DIV
VDDQ
IN
FN6168.2