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EL7563CM Datasheet

  • EL7563CM

  • Monolithic 4 Amp DC/DC Step-Down Regulator

  • 644.44KB

  • 16页

  • INTERSIL

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

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