el7531 Intersil Corporation, el7531 Datasheet - Page 2

• Manufacturer Part Number: el7531
• Description: Monolithic 1a Step-down Regulator With Low Quiescent Current
• Manufacturer: Intersil Corporation

Absolute Maximum Ratings
V
LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V
SYNC, EN, V
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
Electrical Specifications
DC CHARACTERISTICS
AC CHARACTERISTICS
R
R
IN
V
V
PARAMETER
∆V
∆V
∆V
DS(ON)-PMOS
DS(ON)-NMOS
EN1
EN2
I
, V
EN
V
T
V
OUT
OUT
OUT
T
V
V
IN
I
F
t
OT,OFF
DD
IN,OFF
LMAX
OT,ON
SYNC
IN,ON
V
OLPG
V
, I
, V
, V
I
PWM
I
t
, V
DD
FB
I
SS
PG
FB
S
SYNC
, PG to SGND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
/V
/V
/V
SYNC1
SYNC2
DD
OUT
OUT
OUT
O
, FB to SGND . . . . . . . . . . . . . -0.3V to (V
Feedback Input Voltage
V
Line Regulation
Load Regulation
Feedback Input Current
Input Voltage
Minimum Voltage for Shutdown
Maximum Voltage for Startup
Input Supply Quiescent Current
Active - PFM Mode
Active - PWM Mode
Supply Current
PMOS FET Resistance
NMOS FET Resistance
Current Limit
Over-temperature Threshold
Over-temperature Hysteresis
EN, SYNC Current
EN, SYNC Rising Threshold
EN, SYNC Falling Threshold
Minimum V
V
PG Voltage Drop
PWM Switching Frequency
Minimum SYNC Pulse Width
Soft-start Time
FB
FB
vs Temperature
Value
FB
DESCRIPTION
for PG, WRT Targeted
2
V
unless otherwise specified.
DD
(T
A
= V
= 25°C)
IN
= V
EN
= 3.3V, C1 = C2 = 10µF, L = 1.8µH, V
J
= T
IN
IN
C
+ +0.3V)
+ +0.3V)
= T
PWM mode
Junction temperature = -40°C to +85°C
(see Figure 7)
V
I
V
V
V
V
PWM, V
EN = 0, V
V
V
T rising
T falling
V
V
V
V
V
I
Guaranteed by design
O
SINK
IN
IN
IN
SYNC
SYNC
DD
DD
EN
DD
DD
FB
FB
A
= 0A to 1A, V
= 3.3V to 5V, I
falling
rising
, V
rising
falling
= 5V, wafer test only
= 5V, wafer test only
= 3.3V
= 3.3V
EL7531
= 3.3mA
RSI
= 0V
= 3.3V
IN
IN
= V
= 0V and 3.3V
= V
DD
CONDITIONS
DD
IN
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2A
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
= 5V
O
= 3.3V (see Figure 7)
= 5V
= 1A (see Figure 7)
O
= 1.8V (as shown in Typical Application Diagram),
1.25
MIN
790
2.5
2.2
2.4
25
86
-1
2
9
TYP
800
120
400
145
130
650
0.3
0.1
0.4
6.5
0.1
1.5
1.8
1.4
1.4
70
45
35
MAX
810
100
145
500
100
5.5
2.2
2.4
7.5
0.8
1.6
75
95
70
1
1
July 13, 2006
FN7428.9
UNIT
MHz
mΩ
mΩ
mV
mA
mV
nA
µA
µA
µA
°C
°C
µA
ns
µs
%
%
%
%
%
V
V
V
A
V
V