Datasheet

UVLO
V
IN
SW Pin
Inductor
Current
SS Pin
V
OUT
2.5V
7.0V
V
CC
t1
t2
LM5010
www.ti.com SNVS307F –SEPTEMBER 2004–REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Figure 8. Startup Sequence
FUNCTIONAL DESCRIPTION
The LM5010 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient
buck bias power converter capable of supplying in excess of 1A to the load. This high voltage regulator contains
an N-Channel buck switch, is easy to implement, and is available in the thermally enhanced WSON-10 and
HTSSOP-14 packages. The regulator’s operation is based on a hysteretic control scheme, and uses an on-time
which varies inversely with V
IN
. This feature results in the operating frequency remaining relatively constant with
load and input voltage variations. The switching frequency can range from 100 kHz to > 1.0 MHz. The hysteretic
control requires no loop compensation resulting in very fast load transient response. The valley current limit
detection circuit, internally set at 1.25A, holds the buck switch off until the high current level subsides. Typical
Application Circuit and Block Diagram shows the functional block diagram. The LM5010 can be applied in
numerous applications to efficiently regulate down higher voltages. This regulator is well suited for 48V telecom
applications, as well as the new 42V automotive power bus. Implemented as a Point-of-Load regulator following
a highly efficient intermediate bus converter can result in high overall system efficiency. Features include:
Thermal shutdown, V
CC
under-voltage lockout, gate drive under-voltage lockout, and maximum duty cycle limit.
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