Datasheet

LM5002
SNVS496D –JANUARY 2007–REVISED MARCH 2013 www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature (T
J
) range of -40°C
to +125°C. Minimum and Maximum limits are ensured 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. V
VIN
= 10V, R
RT
= 48.7kΩ unless
otherwise stated
(1)
.
Symbol Parameter Conditions Min Typ Max Units
OSCILLATOR
F
SW1
Frequency1 R
RT
= 48.7 kΩ 225 260 295 KHz
F
SW2
Frequency2 R
RT
= 15.8 kΩ 660 780 900 KHz
V
RT-SYNC
SYNC Threshold 2.2 2.6 3.2 V
SYNC Pulse Width Minimum V
RT
> V
RT-SYNC
+ 0.5V 15 ns
PWM COMPARATOR
Maximum Duty Cycle 80 85 90 %
Min On-time V
COMP
> V
COMP-OS
25 ns
Min On-time V
COMP
< V
COMP-OS
0 ns
V
COMP-OS
COMP to PWM Comparator Offset 0.9 1.30 1.55 V
ERROR AMPLIFIER
V
FB-REF
Internal reference
Feedback Reference Voltage 1.241 1.260 1.279 V
V
FB
= V
COMP
FB Bias Current 10 nA
DC Gain 72 dB
COMP Sink Current V
COMP
= 250mV 2.5 mA
COMP Short Circuit Current V
FB
= 0, V
COMP
= 0 0.9 1.2 1.5 mA
COMP Open Circuit Voltage V
FB
= 0 4.8 5.5 6.2 V
COMP to SW Delay 42 ns
Unity Gain Bandwidth 3 MHz
THERMAL SHUTDOWN
T
SD
Thermal Shutdown Threshold 165 °C
Thermal Shutdown Hysteresis 20 °C
THERMAL RESISTANCE
θ
JC
Junction to Case, SOIC-8 32 °C/W
θ
JA
Junction to Ambient, SOIC-8 140 °C/W
θ
JC
Junction to Case, WSON-8 4.5 °C/W
θ
JA
Junction to Ambient, WSON-8 40 °C/W
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