CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
NOTE:
1.
θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
Electrical Specifications
PARAMETER
DC CHARACTERISTICS
V
FB
I
FB
V
IN
, V
DD
V
IN,OFF
V
IN,ON
I
S
V
DD
= V
IN
= V
EN
= 3.3V, C1 = C2 = 10µF, L = 1.8µH, V
O
= 1.8V (as shown in Typical Application Diagram),
unless otherwise specified.
CONDITIONS
MIN
TYP
MAX
UNIT
DESCRIPTION
Feedback Input Voltage
Feedback Input Current
Input Voltage
Minimum Voltage for Shutdown
Maximum Voltage for Startup
Input Supply Quiescent Current
Active - PFM Mode
Active - PWM Mode
PWM Mode
790
800
810
100
mV
nA
V
V
V
2.5
V
IN
falling
V
IN
rising
2
2.2
5.5
2.2
2.4
V
SYNC
= 0V
V
SYNC
= 3.3V
PWM, V
IN
= V
DD
= 5V
EN = 0, V
IN
= V
DD
= 5V
120
6.5
400
0.1
70
45
1.2
145
7.5
500
1
100
75
µA
mA
µA
µA
mΩ
mΩ
A
°C
°C
I
DD
Supply Current
R
DS(ON)-PMOS
PMOS FET Resistance
V
DD
= 5V, wafer test only
V
DD
= 5V, wafer test only
R
DS(ON)-NMOS
NMOS FET Resistance
I
LMAX
T
OT,OFF
T
OT,ON
I
EN
, I
SYNC
V
EN1
, V
SYNC1
V
EN2
, V
SYNC2
V
PG
Current Limit
Over-temperature Threshold
Over-temperature Hysteresis
EN, SYNC Current
EN, SYNC Rising Threshold
EN, SYNC Falling Threshold
Minimum V
FB
for PG, WRT Targeted
V
FB
Value
PG Voltage Drop
T rising
T falling
V
EN
, V
RSI
= 0V and 3.3V
V
DD
= 3.3V
V
DD
= 3.3V
V
FB
rising
V
FB
falling
I
SINK
= 3.3mA
86
0.8
-1
145
130
1
2.4
µA
V
V
95
%
%
V
OLPG
35
70
mV
AC CHARACTERISTICS
F
PWM
t
SYNC
t
SS
PWM Switching Frequency
Minimum SYNC Pulse Width
Soft-start Time
Guaranteed by design
1.25
25
650
1.4
1.6
MHz
ns
µs
2
FN7434.3
August 10, 2005
EL7530
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
SGND
PGND
LX
VIN
VDD
SYNC
EN
PG
VO
FB
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
PIN FUNCTION
Block Diagram
100Ω
0.1µF
V
DD
V
O
10pF
INDUCTOR SHORT
+
-
CURRENT
SENSE
PWM
COMPEN-
SATION
+
-
PWM
COMPARATOR
PFM
ON-TIME
CONTROL
CONTROL
LOGIC
C4 124K
470pF
V
IN
FB
5M
-
+
100K
SYNC
EN
10µF
SYNC
EN
SOFT-
START
CLOCK
RAMP
GENERA-
TOR
P-DRIVER
LX
1.8µH
1.8V
0 TO 600mA
+
-
PWM
COMPARATOR
UNDER-
VOLTAGE
LOCKOUT
TEMPERA-
TURE
SENSE
POWER
GOOD
N-DRIVER
10µF
5V
+
–
BANDGAP
REFERENCE
PGND
+
-
SYNCHRONOUS
RECTIFIER
100K
PG
PG
SGND
3
FN7434.3
August 10, 2005
EL7530
Performance Curves and Waveforms
All waveforms are taken at V
IN
=3.3V, V
O
=1.8V, I
O
=600mA with component values shown on page 1 at room ambient temperature, unless
otherwise noted.
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
50
45
40
1
10
I
O
(mA)
V
IN
=5V
100
600
V
O
=1.2V
V
O
=0.8V
V
O
=1.8V
V
O
=1.5V
V
O
=1.0V
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
1
10
I
O
(mA)
100
600
V
O
=3.3V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=1.0V
V
O
=0.8V
V
IN
=5V
V
O
=3.3V
V
O
=2.5V
FIGURE 1.
EFFICIENCY vs
I
O
(PFM/PWM MODE)
FIGURE 2. EFFICIENCY vs I
O
(PWM MODE)
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
50
45
40
1
100
V
O
=2.5V
V
O
=1.8V
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
V
IN
=3.3V
10
I
O
(mA)
100
600
0
1
10
I
O
(mA)
100
600
V
O
=0.8V
V
IN
=3.3V
V
O
=1.5V
V
O
=1.2V
V
O
=1.0V
V
O
=0.8V
V
O
=2.5V
V
O
=1.8V
V
O
=1.5V
V
O
=1.2V
V
O
=1.0V
FIGURE 3. EFFICIENCY vs I
O
(PFM/FWM MODE)
FIGURE 4. EFFICIENCY vs I
O
(PWM MODE)
1.44
1.42
1.4
V
IN
=5V I
O
=600mA
V
IN
=3.3V I
O
=600mA
V
IN
=5V I
O
=0A
V
O
CHANGES
0.1%
0.0%
-0.1%
-0.2%
-0.3%
-0.4%
-0.5%
V
IN
=5V
V
IN
=3.3V
F
S
(MHz)
V
IN
=3.3V I
O
=0A
1.38
1.36
1.34
1.32
-50
0
50
T
A
(°C)
100
150
0
0.2
0.4
I
O
(A)
0.6
0.8
1
FIGURE 5. F
S
vs JUNCTION TEMPERATURE (PWM MODE)
FIGURE 6. LOAD REGULATIONS (PWM MODE)
4
FN7434.3
August 10, 2005
EL7530
Performance Curves and Waveforms
(Continued)
All waveforms are taken at V
IN
=3.3V, V
O
=1.8V, I
O
=600mA with component values shown on page 1 at room ambient temperature, unless
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