Datasheet

LM25011, LM25011-Q1
www.ti.com SNVS617G –APRIL 2009–REVISED FEBRUARY 2013
PIN DESCRIPTIONS
Pin No. Name Description Application Information
1 VIN Input supply voltage Operating input range is 6V to 42V. Transient capability is 45V. A low ESR
capacitor must be placed as close as possible to the VIN and SGND pins.
2 RT On-time Control An external resistor from VIN to this pin sets the buck switch on-time, and the
switching frequency.
3 PGD Power Good Logic output indicates when the voltage at the FB pin has increased to above
95% of the internal reference voltage. Hysteresis is provided. An external
pull-up resistor to a voltage less than 7V is required.
4 SS Soft-Start An internal current source charges an external capacitor to provide the soft-
start function.
5 SGND Signal Ground Ground for all internal circuitry other than the current limit sense circuit.
6 FB Feedback Internally connected to the regulation comparator. The regulation level is
2.51V.
7 CSG Current Sense Ground Ground connection for the current limit sensing circuit. Connect to ground
and to the current sense resistor.
8 CS Current sense Connect to the current sense resistor and the anode of the free-wheeling
diode.
9 SW Switching Node Internally connected to the buck switch source. Connect to the external
inductor, cathode of the free-wheeling diode, and bootstrap capacitor.
10 BST Bootstrap capacitor connection of the Connect a 0.1 µF capacitor from SW to this pin. The capacitor is charged
buck switch gate driver. during the buck switch off-time via an internal diode.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
(1)
VIN to SGND (T
J
= 25°C) 45V
BST to SGND 52V
SW to SGND (Steady State) -1.5V to 45V
BST to SW -0.3V to 7V
CS to CSG -0.3V to 0.3V
CSG to SGND -0.3V to 0.3V
PGD to SGND -0.3V to 7V
SS to SGND -0.3V to 3V
RT to SGND -0.3V to 1V
FB to SGND -0.3V to 7V
ESD Rating, Human Body Model
(2)
2kV
Storage Temperature Range -65°C to +150°C
For soldering specs, see www.ti.com/packaging.
Junction Temperature 150°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
(2) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
OPERATING RATINGS
(1)
VIN Voltage 6.0V to 42V
Junction Temperature –40°C to +125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
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