isl88550a Intersil Corporation, isl88550a Datasheet - Page 10

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

Typical Operating Characteristics
FIGURE 15. VDDQ START-UP AND SHUTDOWN INTO LIGHT
FIGURE 17. OVERVOLTAGE AND TURN-OFF OF BUCK
FIGURE 19. SHORT CIRCUIT AND RECOVERY OF VDDQ
UVP ENABLE
R
VDDQ
= 10Ω, R
LOAD, DISCHARGE ENABLED
OUTPUT
VTT
= 20Ω
2ms/DIV
50µs/DIV
50µs/DIV
10
unless otherwise noted. (Continued)
V
IN
UGATE
2V/DIV
VDDQ
500mV/DIV
LGATE
2V/DIV
VTT
500mV/DIV
VDDQ
1V/DIV
I
10A/DIV
V
10V/DIV
I
5A/DIV
VDDQ
1V/DIV
VTT
500mV/DIV
POK1
5V/DIV
SHDNA#
5V/DIV
VDDQ
IN
IN
= 12V, V
ISL88550A
DDQ
= 1.8V, t
I
VTT
UVP DISABLE, FOLDBACK CURRENT LIMIT
ON
FIGURE 18. SHORT CIRCUIT AND RECOVERY OF VDDQ
FIGURE 20. SHORT CIRCUIT AND RECOVERY OF VTT
FIGURE 16. VTT, VTTR START-UP AND SHUTDOWN
= 1.5A, I
= GND, SKIP# = AV
VTTR
= 15mA
200µs/DIV
100µs/DIV
100µs/DIV
DD
, circuit of Figure 29, T
A
= +25°C,
October 1, 2007
POK2
1V/DIV
VTT
500mV/DIV
2A/DIV
VTT
500mV/DIV
VTTR
500mV/DIV
STBY#
5V/DIV
VDDQ
1V/DIV
I
10A/DIV
V
10V/DIV
I
5A/DIV
I
VDDQ
IN
VTT
IN
FN6168.2