Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- OPERATING RANGE
- ELECTRICAL CHARACTERISTICS
- TYPICAL PERFORMANCE CHARACTERISTICS
- BLOCK DIAGRAM
- APPLICATION INFORMATION
- CONSTANT ON-TIME CONTROL OVERVIEW
- INTERNAL OPERATION UNDER-VOLTAGE COMPARATOR
- ON-TIME GENERATOR SHUTDOWN
- CURRENT LIMIT
- N-CHANNEL HIGH SIDE SWITCH AND DRIVER
- THERMAL SHUTDOWN
- COMPONENT SELECTION
- FREQUENCY SELECTION
- INDUCTOR SELECTION
- OUTPUT CAPACITOR
- RIPPLE FEED FORWARD
- FEEDBACK RESISTORS
- INPUT CAPACITOR
- AVIN CAPACITOR
- SOFT-START CAPACITOR
- EXTVCC CAPACITOR
- SHUTDOWN
- CBOOT CAPACITOR
- PGOOD RESISTOR
- CATCH DIODE
- BYPASS CAPACITOR
- EXTERNAL OPERATION STARTUP
- UNDER- & OVER-VOLTAGE CONDITIONS
- CURRENT LIMIT
- MODES OF OPERATION
- LINE REGULATION
- TRANSIENT RESPONSE
- EFFICIENCY
- PRE-BIAS LOAD STARTUP
- THERMAL CONSIDERATIONS
- LAYOUT CONSIDERATIONS
- Revision History

LM2696
www.ti.com
SNVS375B –OCTOBER 2005–REVISED APRIL 2013
ABSOLUTE MAXIMUM RATINGS
(1)(2)(3)
Voltages from the indicated pins to GND
AVIN −0.3V to +26V
PVIN −0.3V to (AV
IN
+0.3V)
CBOOT −0.3V to +33V
CBOOT to SW −0.3V to +7V
FB, SD, SS, PGOOD −0.3V to +7V
Storage Temperature Range −65°C to +150°C
Junction Temperature +150°C
Lead Temperature (Soldering, 10 sec.) 260°C
Minimum ESD Rating 1.5 kV
(1) Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications, see Electrical
Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) Without PCB copper enhancements. The maximum power dissipation must be derated at elevated temperatures and is limited by T
JMAX
(maximum junction temperature), θ
J-A
(junction to ambient thermal resistance) and T
A
(ambient temperature). The maximum power
dissipation at any temperature is: P
DissMAX
= (T
JMAX
- T
A
) /θ
J-A
up to the value listed in the Absolute Maximum Ratings. θ
J-A
for HTSSOP-
16 package is 38.1°C/W, T
JMAX
= 125°C.
OPERATING RANGE
Junction Temperature −40°C to +125°C
AVIN to GND 4.5V to 24V
PVIN 4.5V to 24V
ELECTRICAL CHARACTERISTICS
Specifications with standard typeface are for T
J
= 25°C, and those in boldface type apply over the full Operating
Temperature Range (T
J
= −40°C to +125°C). Minimum and Maximum limits are specified through test, design or statistical
correlation. Typical values represent the most likely parametric norm at T
J
= 25°C and are provided for reference purposes
only. Unless otherwise specified V
IN
= 12V.
Symbol Parameter Condition Min Typ Max Units
V
FB
Feedback Pin Voltage V
IN
= 4.5V to 24V
1.225 1.254 1.282 V
I
SW
= 0A to 3A
I
CL
Switch Current Limit V
CBOOT
= V
SW
+ 5V 3.6 4.9 6.4 A
R
DS_ON
Switch On Resistance I
SW
= 3A 0.13 0.22 Ω
I
Q
Operating Quiescent Current V
FB
= 1.5V 1.3 2 mA
V
UVLO
AVIN Under Voltage Lockout Rising V
IN
3.9 4.125 4.3 V
V
UVLO HYS
AVIN Under Voltage Lockout Hysteresis 60 120 mV
I
SD
Shutdown Quiescent Current V
SD
= 0V 12 25 µA
k
ON
Switch On-Time Constant I
ON
= 50 µA to 100 µA 50 66 82 µA µs
V
D ON
R
ON
Voltage 0.35 0.65 0.95 V
T
OFF_MIN
Minimum Off Time FB = 1.24V 165 250 ns
FB = 0V 12 30 µs
T
ON MIN
Minimum On-time 400 ns
V
EXTV
EXTV
CC
Voltage 3.30 3.65 4.00 V
ΔV
EXTV
EXTV
CC
Load Regulation I
EXTV
= 0 µA to 50 µA 0.03 0.5 %
V
PWRGD
PGOOD Threshold (PGOOD Transition With respect to V
FB
91.5 93.5 95.5 %
from Low to High)
V
PG_HYS
PGOOD Hysteresis 1 2.1 %
I
OL
PGOOD Low Sink Current V
PGOOD
= 0.4V 0.5 2 mA
I
OH
PGOOD High Leakage Current 50 nA
I
FB
Feedback Pin Bias Current V
FB
= 1.2V 0 nA
I
SS_SOURCE
Soft-Start Pin Source Current V
SS
= 0V 0.7 1 1.4 µA
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