TNY284-290
BYPASS/
MULTI-FUNCTION
(BP/M)
DRAIN
(D)
REGULATOR
5.85 V
LINE UNDER-VOLTAGE
115 μA
25 μA
FAULT
PRESENT
BYPASS PIN
UNDER-VOLTAGE
+
-
AUTO-
RESTART
COUNTER
BYPASS
CAPACITOR
SELECT AND
CURRENT
LIMIT STATE
MACHINE
5.85 V
4.9 V
VILIMIT
LINE
RESET
COMPENSATION
6.4 V
CURRENT LIMIT
COMPARATOR
-
ENABLE
1.0 V + VT
1.0 V
+
JITTER
CLOCK
THERMAL
SHUTDOWN
DC
MAX
OSCILLATOR
S
R
Q
Q
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
LEADING
EDGE
OVP
BLANKING
LATCH
SOURCE
(S)
PI-6639-113011
Figure 3. Functional Block Diagram.
Pin Functional Description
D Package (SO-8C)
DRAIN (D) Pin:
EN/UV 1
BP/M 2
8 S
This pin is the power MOSFET drain connection. It provides
internal operating current for both start-up and steady-state
operation.
7 S
6 S
5 S
P Package (DIP-8C)
BYPASS/MULTI-FUNCTION (BP/M) Pin:
D 4
This pin has multiple functions:
•ꢀ It is the connection point for an external bypass capacitor for
the internally generated ꢀ.8ꢀ V supply.
EN/UV 1
BP/M 2
8 S
7 S
Exposed Pad (On Bottom)
Internally Connected to
SOURCE Pin
•ꢀ It is a mode selector for the current limit value, depending on
the value of the capacitance added. Use of a 0.1 μF capaci-
tor results in the standard current limit value. Use of a 1 μF
capacitor results in the current limit being reduced to that of
the next smaller device size. Use of a 10 μF capacitor results
in the current limit being increased to that of the next larger
device size for TNY28ꢀ-290.
•ꢀ It provides a shutdown function. When the current into the
bypass pin exceeds ISD, the device latches off until the BP/M
voltage drops below 4.9 V, during a power-down or, when the
UV function is employed with external resistors connected to
the BP/UV pin, by taking the UV/EN pin current below IUV
minus the reset hysteresis (Typ. 18.7ꢀ μA). This can be used
6 S
5 S
K Package
(eSOP-12B)
D 4
EN/UV 1
12 S
11 S
10 S
9 S
BP/M 2
N/C 3
N/C 4
8 S
D 6
7 S
PI-6577-053112
Figure 4. Pin Configuration.
2
Rev. A 09/12
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