ISL8010_06 Datasheet, PDF (3/11 Pages) Intersil Corporation – Monolithic 600mA Step-Down Regulator with Low Quiescent Current

ISL8010
Pin Descriptions
PIN NUMBER
1
2
3
4
PIN NAME
SGND
PGND
LX
VIN
5
VDD
6
SYNC
7
EN
8
PG
9
VO
10
FB
Block Diagram
PIN FUNCTION
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
Voltage feedback input; connected to an external resistor divider between V_O and SGND for variable
output
100Ω
V_DD
0.1µF
V_O
C4 124K
470pF
FB 5M
10pF
-
+
100K
SYNC
EN
10µF
SYNC
EN
CLOCK
SOFT-
START
5V
+
–
BANDGAP
REFERENCE
SGND
PWM
COMPEN-
SATION
RAMP
GENERA-
TOR
UNDER-
VOLTAGE
LOCKOUT
POWER
GOOD
INDUCTOR SHORT
+
-
CURRENT
SENSE
+
-
PWM
COMPARATOR
PFM
ON-TIME
CONTROL
CONTROL
LOGIC
P-DRIVER
V_IN
LX ^1.8µH
+
-
PWM
COMPARATOR
TEMPERATURE
SENSE
N-DRIVER
10µF
+
-
SYNCHRONOUS
RECTIFIER
PGND
PG
1.8V
0 TO 600mA
100K
PG
3
FN6191.4
July 12, 2006