Datasheet

Top View
14 Lead HTSSOP
SW
BST
V
CC
V
IN
NC
NC
NC
NC
RTN
FB
SS
11
10
9
5
4
3
2
1
6
7 8
12
13
14
R
ON
/SD
I
SEN
S
GND
SW
BST
RTN
V
CC
FB
SS
V
IN
Top View
10 Lead WSON
10
9
8
7
6
5
4
3
2
1
/SDR
ON
S
GND
I
SEN
LM5010
SNVS307F –SEPTEMBER 2004–REVISED FEBRUARY 2013 www.ti.com
Connection Diagram
Pin Functions
Table 1. Pin Description
PIN NUMBER NAME DESCRIPTION APPLICATION INFORMATION
WSON- HTSSOP-
10 14
1 2 SW Switching Node Internally connected to the buck switch source. Connect to the
inductor, free-wheeling diode, and bootstrap capacitor.
2 3 BST Boost pin for bootstrap Connect a 0.022 µF capacitor from SW to this pin. The capacitor
capacitor is charged from V
CC
via an internal diode during each off-time.
3 4 I
SEN
Current sense The re-circulating current flows through the internal sense
resistor, and out of this pin to the free-wheeling diode. Current
limit is nominally set at 1.25A.
4 5 S
GND
Sense Ground Re-circulating current flows into this pin to the current sense
resistor.
5 6 RTN Circuit Ground Ground for all internal circuitry other than the current limit
detection.
6 9 FB Feedback input from the Internally connected to the regulation and over-voltage
regulated output comparators. The regulation level is 2.5V.
7 10 SS Softstart An internal 11.5 µA current source charges an external capacitor
to 2.5V, providing the soft start function.
8 11 R
ON
/SD On-time control and shutdown An external resistor from V
IN
to this pin sets the buck switch on-
time. Grounding this pin shuts down the regulator.
9 12 V
CC
Output from the startup Nominally regulates at 7.0V. An external voltage (7.5V-14V) can
regulator be applied to this pin to reduce internal dissipation. An internal
diode connects V
CC
to V
IN
.
10 13 V
IN
Input supply voltage Nominal input range is 8.0V to 75V.
1, 7, 8, 14 NC No connection No internal connection.
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