el7530 Intersil Corporation, el7530 Datasheet - Page 3

• Manufacturer Part Number: el7530
• Description: Monolithic 600ma Step-down Regulator With Low Quiescent Current
• Manufacturer: Intersil Corporation

Pin Descriptions
Block Diagram
SYNC
PIN NUMBER
EN
5V
+
–
10
1
2
3
4
5
6
7
8
9
10µF
470pF
C
4
0.1µF
100Ω
124K
100K
V
V
FB
SYNC
EN
SGND
PIN NAME
DD
O
SGND
PGND
SYNC
VDD
VIN
PG
VO
EN
LX
FB
5M
REFERENCE
BANDGAP
CLOCK
START
SOFT-
3
+
10pF
-
Negative supply for the controller stage
Negative supply for the power stage
Inductor drive pin; high current digital output with average voltage equal to the regulator output voltage
Positive supply for the power stage
Power supply for the controller stage
SYNC input pin; when connected to HI, regulator runs at forced PWM mode; when connected to Low, auto
PFM/PWM mode; when connected to external sync signal, at external PWM frequency up to 12MHz
Enable
Power-Good open drain output
Output voltage sense
output
Voltage feedback input; connected to an external resistor divider between V
LOCKOUT
COMPEN-
VOLTAGE
GENERA-
SATION
UNDER-
POWER
RAMP
GOOD
PWM
TOR
EL7530
COMPARATOR
COMPARATOR
CONTROL
TEMPERA-
ON-TIME
SENSE
TURE
+
PFM
+
-
PWM
-
PWM
PIN FUNCTION
CONTROL
LOGIC
INDUCTOR SHORT
SYNCHRONOUS
P-DRIVER
CURRENT
N-DRIVER
RECTIFIER
SENSE
+
+
-
-
O
PGND
and SGND for variable
V
PG
LX
IN
1.8µH
10µF
July 12, 2006
FN7434.6
100K
1.8V
0 TO 600mA
PG