el7531 Intersil Corporation, el7531 Datasheet - Page 7

• Manufacturer Part Number: el7531
• Description: Monolithic 1a Step-down Regulator With Low Quiescent Current
• Manufacturer: Intersil Corporation

Performance Curves and Waveforms
All waveforms are taken at V
noted.
FIGURE 19. LOAD TRANSIENT RESPONSE (22mA to 1A)
FIGURE 21. PWM LOAD TRANSIENT RESPONSE
I
O
=50mA
FIGURE 23. PFM-PWM TRANSITION TIME
(0.25A TO 0.75A)
50µs/DIV
100µs/DIV
2µs/DIV
IN
= 3.3V, V
7
O
= 1.8V, I
O
= 1A with component values shown on page 1 at room ambient temperature, unless otherwise
SYNC
(2V/DIV)
LX
(2V/DIV)
I
(0.5A/DIV)
I
(0.5A/DIV)
O
O
∆V
(100mV/DIV)
∆V
(100mV/DIV)
O
O
(Continued)
EL7531
FIGURE 20. PWM LOAD TRANSIENT RESPONSE (0A TO 1A)
I
O
FIGURE 24. PFM-PWM LOAD REGULATION
FIGURE 22. PFM-PWM TRANSITION TIME
-1
-2
-3
=150mA
3
2
1
0
0
PFM
200
50µs/DIV
2µs/DIV
400
I
OUT
PWM
600
(mA)
800
1000
SYNC
(2V/DIV)
LX
(2V/DIV)
I
(0.5A/DIV)
O
∆V
(100mV/DIV)
1200
July 13, 2006
O
FN7428.9