EL7563 データシートの表示（PDF） - Renesas Electronics
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EL7563 Datasheet PDF : 16 Pages
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EL7563
Pin Descriptions
20-PIN SO
(0.300”)
28-PIN
HTSSOP
PIN NAME
PIN FUNCTION
1
1
VREF Bandgap reference bypass capacitor; typically 0.1µF to SGND
2
2
SGND Control circuit negative supply or signal ground
3
3
COSC Oscillator timing capacitor (see performance curves)
4
4
VDD
Control circuit positive supply; normally connected to VIN through an RC filter
5
5
VTJ
Junction temperature monitor; connected with 2.2nF to 3.3nF to SGND
6, 7
6, 7, 8, 9
PGND Ground return of the regulator; connected to the source of the low-side synchronous NMOS
power FET
8
10, 11
VIN
Power supply input of the regulator; connected to the drain of the high-side NMOS power FET
9
13
STP
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
10
14
STN
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
11, 12, 13
15, 16
PGND
Ground return of the regulator; connected to the source of the low-side synchronous NMOS
power FET
14, 15
18, 19, 20, 21,
22, 23
LX
Inductor drive pin; high current output whose average voltage equals the regulator output
voltage
16
24
VHI
Positive supply of high-side driver; boot strapped from VDRV to LX with an external 0.22µF
capacitor
17
25
VDRV Positive supply of low-side driver and input voltage for high side boot strap
18
26
PG
Power good window comparator output; logic 1 when regulator output is within ±10% of target
output voltage
19
27
FB
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
20
28
EN
Chip enable, active high; a 2µA 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
VIN=3.3V
100
95
90
VO=2.5V
VO=1.8V
85
80
VO=1.2V
75
VO=1V
70
0 0.5 1 1.5 2 2.5 3 3.5 4
LOAD CURRENT IO (A)
FIGURE 1. EL7563CM EFFICIENCY vs IO
VIN=3.3V
100
95
VO=2.5V
90
85
80
VO=1.8V
75
VO=1.2V
70
65
60
0.1 0.6 1.1 1.6 2.1 2.6 3.1 3.6 4
IO (A)
FIGURE 2. EL7563CRE EFFICIENCY
FN7296 Rev 2.00
May 13, 2005
Page 5 of 16
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