Datasheet

Exposed Pad
Connect to GND
5
FB
6
VOUT
3
SS
1
VIN
2
EN
4
GND
7
VOUT
LMZ10503
www.ti.com SNVS641I –JANUARY 2010–REVISED OCTOBER 2013
Connection Diagram
Figure 5. Top View
7-Lead PFM
Package Number NDW0007A
PIN DESCRIPTIONS
Pin Number Name Description
1 VIN Power supply input. A low ESR input capacitance should be located as close as possible to the VIN pin and
exposed pad (EP).
2 EN Active high enable input for the device.
3 SS Soft-start control pin. An internal 2 µA current source charges an external capacitor connected between SS
and GND pins to set the output voltage ramp rate during startup. The SS pin can also be used to configure
the tracking feature.
4 GND Power ground and signal ground. Provide a direct connection to the EP. Place the bottom feedback resistor
as close as possible to GND and FB pin.
5 FB Feedback pin. This is the inverting input of the error amplifier used for sensing the output voltage. Keep the
copper area of this node small.
6, 7 VOUT The output terminal of the internal inductor. Connect the output filter capacitor between VOUT pin and EP.
EP Exposed Exposed pad is used as a thermal connection to remove heat from the device. Connect this pad to the PC
Pad board ground plane in order to reduce thermal resistance value. EP must also provide a direct electrical
connection to the input and output capacitors ground terminals. Connect EP to pin 4.
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)(2)
VIN, VOUT, EN, FB, SS to GND -0.3V to 6.0V
ESD Susceptibility
(3)
±2 kV
Power Dissipation Internally Limited
Junction Temperature 150°C
Storage Temperature Range -65°C to 150°C
Peak Reflow Case Temperature 245°C
(30 sec)
For soldering specifications, refer to the following document: www.ti.com/lit/snoa549c
(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 ensured specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. Test method is per JESD22-AI14S.
Operating Ratings
(1)
VIN to GND 2.95V to 5.5V
Junction Temperature (T
J
) -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 ensured specifications and test conditions, see the Electrical Characteristics.
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