EL7564 查看數據表（PDF） - Intersil
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EL7564 Datasheet PDF : 17 Pages
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EL7564
Pin Descriptions
20-PIN SO
(0.300”)
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
PIN FUNCTION
VREF Bandgap reference bypass capacitor; typically 0.1µF to SGND
SGND Control circuit negative supply or signal ground
COSC Oscillator timing capacitor (see performance curves)
VDD
Control circuit positive supply; normally connected to VIN through an RC filter
VTJ
Junction temperature monitor; connected with 2.2nF to 3.3nF to SGND
PGND
Ground return of the regulator; connected to the source of the low-side synchronous NMOS
power FET
VIN
Power supply input of the regulator; connected to the drain of the high-side NMOS power FET
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
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
PGND
Ground return of the regulator; connected to the source of the low-side synchronous NMOS
power FET
LX
Inductor drive pin; high current output whose average voltage equals the regulator output
voltage
VHI
Positive supply of high-side driver; boot strapped from VDRV to LX with an external 0.22µF
capacitor
VDRV Positive supply of low-side driver and input voltage for high side boot strap
PG
Power good window comparator output; logic 1 when regulator output is within ±10% of target
output voltage
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
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
VIN=5V
100
95
VO=3.3V
90
85
VO=2.8V
80
VO=1.8V
75
70
65
60
0 0.5 1 1.5 2 2.5 3 3.5 4
LOAD CURRENT IO (A)
FIGURE 1. EL7564CM EFFICIENCY
VIN=5V
100
95
VO=3.3V
90
85
VO=2.5V
80
VO=1.8V
75
70
65
60
0.1 0.6 1.1 1.6 2.1 2.6 3.1 3.6 4.1
IO (A)
FIGURE 2. EL7564CRE EFFICIENCY
5
FN7297.3
May 9, 2005
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