TPS794XX_16 Datasheet, PDF (4/23 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA LOW-DROPOUT LINEAR REGULATORS

TPS794xx
SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005
FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION
IN
UVLO
GND
EN
Thermal
Shutdown
Bandgap
V_IN
Reference
1.225 V
Current
Sense
ILIM
_
SHUTDOWN
+
UVLO
Quickstart
250 kΩ
V_ref
OUT
R₁
FB
R₂
External to
the Device
NR⁽¹⁾
(1) Not Available on DCQ (SOT223) options.
FUNCTIONAL BLOCK DIAGRAM—FIXED VERSION
IN
GND
EN
UVLO
Current
Sense
ILIM
SHUTDOWN
_+
R₁
UVLO
OUT
Thermal
Shutdown
Quickstart
Bandgap
V_IN
Reference
1.225 V
250 kΩ
V_ref
R₂
R₂ = 40k
NR
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NAME
NR
EN
FB
GND
IN
NC
OUT
Terminal Functions
TERMINAL
DGN
DCQ
(MSOP) (SOT223)
DESCRIPTION
4
5
Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap, which
improves power-supply rejection and reduces output noise.
6
1
The EN terminal is an input that enables or shuts down the device. When EN is a logic high, the device
is enabled. When the device is a logic low, the device is in shutdown mode.
3
5
Feedback input voltage for the adjustable device.
5, PAD
3, 6 Regulator ground
8
2
Unregulated input to the device.
2, 7
No internal connection.
1
4
Regulator output
4
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