A
B
A
2B
V(DS)
Detector
Enable
Constant
Power
Engine
_
+
50mVmax
Charge
Pump
22  A
m
GateControl
Amplifier
4V
Reference
14V
2mA
+

+

I(D)
Detector
_
+
9mS
Deglitch
Inrush
Complete
Power/Current
Amplifier
25  A
m
Fault
Logic
_
+
4V
and
1V
2.5  A
m
Timer
For AutoretryOptionwith
DutyCycleof0.75%
_
+
_
+
UVLO
Enable
POR
8.4Vand
8.3V
1.35Vand
1.25V
10
VCC
3
PROG
9
ENSE
1
EN
5
GND
4
6
PG
7
OUT
8
GATE
2
VREF
2.7Vand
1.25V
Enable
TPS2490
TPS2491
SLVS503D NOVEMBER 2003REVISED JULY 2012
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
PIN FUNCTIONS
PIN
I/O
DESCRIPTION
NAME
NO.
EN
1
I
Device enable
VREF
2
O
Reference voltage output, used to set power threshold on PROG pin
PROG
3
I
Power-limit setting input
TIMER
4
I/O
Fault timing capacitor
GND
5
Ground
PG
6
O
Power good reporting output, open-drain
OUT
7
I
Output voltage feedback
GATE
8
O
Gate output
SENSE
9
I
Current-limit sense input
VCC
10
I
Supply input
8
Copyright ?20032012, Texas Instruments Incorporated
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