EL7531
Absolute Maximum Ratings (T = 25°C)
A
V
, V , PG to SGND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2A
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
IN DD
LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V + +0.3V)
IN
SYNC, EN, V , FB to SGND. . . . . . . . . . . . . -0.3V to (V + +0.3V)
IN
O
PGND to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
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 = T = T
A
J
C
Electrical Specifications
V
= V = V
IN
= 3.3V, C1 = C2 = 10µF, L = 1.8µH, V = 1.8V (as shown in Typical Application Diagram),
EN O
DD
unless otherwise specified.
DESCRIPTION
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
DC CHARACTERISTICS
V
Feedback Input Voltage
vs Temperature
PWM mode
790
800
0.3
810
mV
%
FB
/V
∆V
V
Junction temperature = -40°C to +85°C
(see Figure 7)
OUT OUT
FB
∆V
∆V
/V
OUT OUT
Line Regulation
V
= 3.3V to 5V, I = 1A (see Figure 7)
0.1
0.4
%
%
nA
V
IN
I = 0A to 1A, V = 3.3V (see Figure 7)
O
O
/V
OUT OUT
Load Regulation
IN
I
Feedback Input Current
Input Voltage
100
5.5
2.2
2.4
FB
, V
V
2.5
2
IN DD
V
Minimum Voltage for Shutdown
Maximum Voltage for Startup
Input Supply Quiescent Current
Active - PFM Mode
V
V
falling
rising
V
IN,OFF
IN
IN
V
2.2
V
IN,ON
I
S
V
V
= 0V
120
6.5
400
0.1
70
145
7.5
500
1
µA
mA
µA
µA
mΩ
mΩ
A
SYNC
SYNC
Active - PWM Mode
Supply Current
= 3.3V
I
PWM, V = V
IN DD
= 5V
= 5V
DD
EN = 0, V = V
IN
DD
R
PMOS FET Resistance
NMOS FET Resistance
Current Limit
V
= 5V, wafer test only
= 5V, wafer test only
100
75
DS(ON)-PMOS
DD
DD
R
V
45
DS(ON)-NMOS
I
1.5
145
130
LMAX
T
Over-temperature Threshold
Over-temperature Hysteresis
EN, SYNC Current
T rising
T falling
°C
°C
µA
V
OT,OFF
T
OT,ON
, I
I
V
V
V
V
V
, V
EN RSI
= 0V and 3.3V
-1
2.4
9
1
EN SYNC
, V
V
V
EN, SYNC Rising Threshold
EN, SYNC Falling Threshold
= 3.3V
= 3.3V
rising
1.8
1.4
EN1 SYNC1
, V
DD
DD
0.8
95
V
EN2 SYNC2
V
Minimum V for PG, WRT Targeted
FB
%
PG
FB
V
Value
FB
falling
86
%
FB
V
PG Voltage Drop
I
= 3.3mA
35
1.4
650
70
mV
OLPG
SINK
AC CHARACTERISTICS
F
PWM Switching Frequency
Minimum SYNC Pulse Width
Soft-start Time
1.25
25
1.6
MHz
ns
PWM
t
Guaranteed by design
SYNC
t
µs
SS
FN7428.6
2
August 5, 2005
INTERSIL [ Intersil ]
