Datasheet

Exposed Pad
Connect to GND
RT/SYNC
3
FB
4
BOOT
1
SS
2
8
SW
7
VIN
6
GND
5
EN
LM22680
SNVS595K –SEPTEMBER 2008–REVISED APRIL 2013 www.ti.com
Connection Diagram
Figure 1. Connection Diagram
Package Number MRA08B
PIN DESCRIPTIONS
Pin Name Description Application Information
1 BOOT Bootstrap input Provides the gate voltage for the high side NFET.
2 SS Soft-start pin Used to increase soft-start time. See Soft-Start section of data sheet.
3 RT/SYNC Oscillator mode control pin Used to control oscillator mode of regulator. See Switching Frequency
Adjustment and Synchronization section of data sheet.
4 FB Feedback pin Feedback input to regulator.
5 EN Enable pin Used to control regulator start-up and shut-down. See Precision Enable and
UVLO section of data sheet.
6 GND System ground System ground pin.
7 VIN Input voltage pin Supply input to the regulator.
8 SW Switch pin Switching output of regulator.
EP EP Exposed pad Connect to ground. Provides thermal connection to PCB. See applications
information.
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 to GND 43V
EN Pin Voltage -0.5V to 6V
SS, RT/SYNC Pin Voltage -0.5V to 7V
SW to GND
(3)
-5V to V
IN
BOOT Pin Voltage V
SW
+ 7V
FB Pin Voltage -0.5V to 7V
Power Dissipation Internally Limited
Junction Temperature 150°C
For soldering specifications, refer to the following document: www.ti.com/lit/snoa549
ESD Rating
(4)
Human Body Model ±2 kV
Storage Temperature Range -65°C to +150°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the recommended Operating Ratings is not implied. The recommended Operating Ratings
indicate conditions at which the device is functional and should not be operated beyond such conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications
(3) The absolute maximum specification of the ‘SW to GND’ applies to DC voltage. An extended negative voltage limit of -10V applies to a
pulse of up to 50 ns.
(4) ESD was applied using the human body model, a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
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