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.
NOTE:
1.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
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
Electrical Specifications
PARAMETER
DC CHARACTERISTICS
V
FB
I
FB
V
IN
, V
DD
V
IN,OFF
V
IN,ON
I
DD
V
DD
= V
IN
= V
EN
= 3.3V, C1 = C2 = 10µF, L = 1.8µH, V
O
= 1.8V, 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
Supply Current
V
IN
falling
V
IN
rising
PWM, V
IN
= V
DD
= 5V
EN = 0, V
IN
= V
DD
= 5V
790
800
810
250
mV
nA
V
V
V
µA
µA
mΩ
mΩ
A
°C
°C
2.5
2
2.2
400
0.1
52
35
3
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
= 5mA
V
IN
= 2.5V to 6V, I
OUT
= 2A, V
OUT
= 1.8V
V
IN
= 3.3V, V
OUT
= 1.8V, I
OUT
= 0 to 2A
86
35
0.1
0.5
0.8
-1
145
130
5.5
2.2
2.4
500
1
80
65
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
RSI
V
EN1
, V
RSI1
V
EN2
, V
RSI2
V
POR
Current Limit (GBD)
Over-temperature Threshold (GBD)
Over-temperature Hysteresis (GBD)
EN, RSI Current
EN, RSI Rising Threshold
EN, RSI Falling Threshold
Minimum V
FB
for POR, WRT Targeted
V
FB
Value
POR Voltage Drop
Line Regulation (GBD)
Load Regulation (GBD)
1
2.4
V
V
V
95
%
%
V
OLPOR
V
LINEREG
V
LOADREG
70
mV
%/V
%
AC CHARACTERISTICS
F
PWM
t
RSI
t
SS
t
POR
PWM Switching Frequency
Minimum RSI Pulse Width (GBD)
Soft-start Time (GBD)
Power On Reset Delay Time (GBD)
80
Guaranteed by design
1.35
1.5
25
650
100
120
1.65
50
MHz
ns
µs
ms
GBD = Guaranteed By Design
2
FN7435.7
December 8, 2006
EL7532
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
SGND
PGND
LX
VIN
VDD
RSI
EN
POR
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
Resets POR timer; Connect to ground if not used
Enable; Can be connected directly to the VIN for enable
Power on reset open drain output; Leave open if not used
Output voltage sense pin
Voltage feedback input; connected to an external resistor divider between V
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