Datasheet

LM3477
www.ti.com SNVS141K –OCTOBER 2000–REVISED MARCH 2013
Absolute Maximum Ratings
(1)(2)
Input Voltage 36V
Peak Driver Output Current (<10µs) 1.0A
CB Pin Voltage
(3)
43V
I
SEN
Pin Voltage 500mV
Power Dissipation Internally Limited
Storage Temperature Range −65°C to +150°C
Junction Temperature +150°C
ESD Susceptibilty
(4)
Human Body Model 2kV
Machine Model 200V
Lead Temperature for VSSOP Package
Vapor Phase (60 sec.) 215°C
Infared (15 sec.) 220°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.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
(3) The CB pin must not be higher than 8V above the V
SW
.
(4) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is 200 pF capacitor
discharged directly into each pin.
Operating Ratings
(1)
Supply Voltage 2.97V ≤ V
IN
≤ 35V
Junction Temperature Range −40°C ≤ T
J
≤ +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.
Electrical Characteristics
(1)
Specifications in Standard type face are for T
J
= 25°C, and in bold type face apply over the full Operating Temperature
Range. Unless otherwise specified, V
IN
= 12V.
Symbol Parameter Conditions Typical Limit Units
V
FB
Feedback Voltage V
COMP
= 1.4V, 1.270 V
2.97V ≤ V
IN
≤ 36V 1.260/1.252 V(min)
1.288/1.290 V(max)
ΔV
LINE
Feedback Voltage Line Regulation 2.97V ≤ V
IN
≤ 36V 0.001 %/V
ΔV
LOAD
Output Voltage Load Regulation ±0.5 %/V (max)
V
UVLO
Input Undervoltage Lock-out 2.87 V
2.97 V(max)
V
UV(HYS)
Input Undervoltage Lock-out Hysteresis 180 mV
130 mV (min)
225 mV (max)
F
SW
Switching Frequency 500 kHz
435 kHz(min)
575 kHz(max)
R
DS1 (ON)
Driver Switch On Resistance (top) I
DR
= 0.2A, V
IN
= 5V 7 Ω
R
DS2 (ON)
Driver Switch On Resistance (bottom) I
DR
= 0.2A 4 Ω
(V
CB
−V
SW
)
max
Maximum Boot Voltage V
IN
< 7.2V V
IN
V
V
IN
≥ 7.2V 7.2
D
max
Maximum Duty Cycle 93 %
88 %(min)
T
min
(on) Minimum On Time 330 nsec
230 nsec(min)
495 nsec(max)
(1) All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature
limits are 100% tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
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