EL7554
DC Electrical Specifications
V DD = V IN = 3.3V, T A = T J = +25°C, C OSC = 390pF, Unless Otherwise Specified
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
V EN_HI
V EN_LO
EN Input High Level
EN Input Low Level
2.6
1
V
V
I EN
Enable Pull-up Current
V EN = 0
-4
-2.5
μA
TM, S EL_HI
TM, S EL_LO
Input High Level
Input Low Level
2.6
1
V
V
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8, 9, 10, 11, 12, 13
14, 15
16, 17, 18
19, 20, 21
22
23
24
25
26
27
28
PIN NAME
COMP
VREF
FB
VO
VTJ
TM
SEL
LX
NC
PGND
VIN
VDD
PG
EN
STP
STN
COSC
SGND
4
PIN FUNCTION
Error amplifier output; place loop compensation components here
Bandgap reference bypass capacitor; typically 0.01μF to 0.047μF to SGND
Voltage feedback input; connected to external resistor divider between V OUT and SGND for adjustable
output; also used for speed-up capacitor connection
Output sense for fixed output; also used for speed-up capacitor connection
Junction temperature monitor output, connected to a 0.01μF - 0.047μF to SGND
Stress test enable; allows ±5% output movement; needs a pull-down resistor (1k - 100k); connect to
SGND if function is not used
Positive or negative voltage margining set pin; needs a pull-down resistor (1k - 100k); connect to SGND
if function is not used
Inductor drive pin; high current output whose average voltage equals the regulator output voltage
Not used
Ground return of the regulator; connected to the source of the low-side synchronous NMOS Power FET
Power supply input of the regulator; connected to the drain of the high-side PMOS Power FET
Control circuit positive supply; connected to V IN through an internal 20 Ω resistor
Power-good window comparator output; logic 1 when regulator output is within ±10% of target output
voltage
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 a converter
Auxilliary supply tracking positive input; tied to regulator output to synchronize start-up with a second
supply; leave open for standalone operation; 2μA internal pull-up current
Auxiliary supply tracking negative input; connect to output of a second supply to synchronize start-up;
leave open for standalone operation; 2μA internal pull-up current
Oscillator timing capacitor (see performance curves)
Control circuit negative supply or signal ground
FN7360.5
November 5, 2007
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