Datasheet

V
OUT
(50 mV/Div)
I
OUT
(5A/Div)
V
OUT
(200 mV/Div)
V
SYNC
(2V/Div)
V
SWITCH
(2V/Div)
V
SWITCH
(2V/Div)
V
SYNC
(2V/Div)
V
OUT
(200 mV/Div)
-40 -20 0 20 40 60 80 100 120
18.7
18.8
18.9
19.0
19.1
19.2
19.3
19.4
19.5
19.6
CURRENT LIMIT I
CLR
(A)
AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100 120
2
3
4
5
6
7
8
9
10
R
DSON
(m)
JUNCTION TEMPERATURE (°C)
LOW SIDE
HIGH SIDE
-40 -20 0 20 40 60 80 100 120
120
124
128
132
136
140
144
148
152
156
160
MINIMUM ON-TIME (nS)
JUNCTION TEMPERATURE (°C)
LM21215A
SNOSB87B –MARCH 2011–REVISED MARCH 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified: V
VIN
= 5V, V
OUT
= 1.2V, L= 0.56µH (1.8mΩ R
DCR
), C
SS
= 33nF, f
SW
= 500 kHz, T
A
= 25°C for
efficiency curves, loop gain plots and waveforms, and T
J
= 25°C for all others.
Minimum On-Time vs. Temperature FET Resistance vs. Temperature
Figure 14. Figure 15.
Peak Current Limit vs. Temperature SYNC Signal Lost
Figure 16. Figure 17. 4 µs/DIV
SYNC Signal Acquired Load Transient Response
Figure 18. 10 µs/DIV Figure 19. 100 µs/DIV
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