EL7563 INTERSIL [Intersil Corporation], EL7563 Datasheet - Page 5

• Manufacturer Part Number: EL7563
• Description: Monolithic 4 Amp DC:DC Step-Down Regulator
• Manufacturer: INTERSIL [Intersil Corporation]

Pin Descriptions
Typical Performance Curves (20 Pin SO Package)
NOTE: The 28-Pin HTSSOP Package Offers Improved Performance
20-PIN SO
11, 12, 13
(0.300”)
14, 15
6, 7
10
16
17
18
19
20
1
2
3
4
5
8
9
100
95
90
85
80
75
70
FIGURE 1. EL7563CM EFFICIENCY vs I
0
V
IN
=3.3V
18, 19, 20, 21,
0.5
HTSSOP
6, 7, 8, 9
28-PIN
10, 11
15, 16
22, 23
13
14
24
25
26
27
28
1
1
2
3
4
5
LOAD CURRENT I
V
V
1.5
O
O
=1.2V
=2.5V
5
2
PIN NAME
SGND
COSC
PGND
PGND
VREF
VDRV
V
VDD
V
STP
STN
VTJ
VIN
VHI
PG
EN
O
LX
FB
2.5
O
=1.8V
=1V
O
(A)
3
Bandgap reference bypass capacitor; typically 0.1µF to SGND
Control circuit negative supply or signal ground
Oscillator timing capacitor (see performance curves)
Junction temperature monitor; connected with 2.2nF to 3.3nF to SGND
Ground return of the regulator; connected to the source of the low-side synchronous NMOS
Power supply input of the regulator; connected to the drain of the high-side NMOS power FET
Ground return of the regulator; connected to the source of the low-side synchronous NMOS
Positive supply of high-side driver; boot strapped from VDRV to LX with an external 0.22µF
Positive supply of low-side driver and input voltage for high side boot strap
Chip enable, active high; a 2µA internal pull up current enables the device if the pin is left open;
Control circuit positive supply; normally connected to VIN through an RC filter
power FET
Auxiliary supply tracking positive input; tied to regulator output to synchronize start up with a
second supply; leave open for stand alone operation; 2µA internal pull down current
Auxiliary supply tracking negative input; connect to output of a second supply to synchronize
start up; leave open for stand alone operation; 2µA internal pull up current
power FET
Inductor drive pin; high current output whose average voltage equals the regulator output
voltage
capacitor
Power good window comparator output; logic 1 when regulator output is within ±10% of target
output voltage
Voltage feedback input; connected to external resistor divider between VOUT and SGND; a
125nA pull-up current forces VOUT to SGND in the event that FB is floating
a capacitor can be added at this pin to delay the start of converter
3.5
O
4
EL7563
100
95
90
85
80
75
70
65
60
PIN FUNCTION
0.1
V
FIGURE 2. EL7563CRE EFFICIENCY
IN
=3.3V
0.6
1.1
1.6
V
O
I
O
=1.8V
2.1
(A)
2.6
3.1
V
V
O
O
=1.2V
=2.5V
3.6
May 13, 2005
4
FN7296.2