1.5A, 280kHz, Boost Regulator
APPLICATION CIRCUIT
R2
3.72k
1
2
LM5171
V
C
FB
Test
SS
V
SW
PGND
AGND
V
CC
8
7
6
5
L1
D1
MBRS120T3
VOUT
5V
C1
0.01uF
3
4
SS
3.3V
R1
5k
+
22uH
C3
22uF
R3
1.28k
+
C2
22uF
ELECTRICAL CHARACTERISTICS
2.7V < Vcc < 30 V, 0°C < T
J
< 125°C, unless otherwise stated.
Characteristics
Error Amplifier
FB Reference Voltage
FB Input Current
FB Reference Voltage Line Regulation
Error Amp Transconductance
Error Amp Gain
Vc Source Current
Vc Sink Current
Vc High Clamp Voltage
Vc Low Clamp Voltage
Vc Threshold
Test Condition
Min
TYP
Max
Unit
Vc tied to FB : Measure at FB
FB = V
REF
Vc = FB
Ivc = ± 25 uA
(Note 2)
1.246
-1.0
-
300
200
25
200
1.5
0.25
200
1.276
0.1
0.01
550
500
50
625
1.7
0.50
625
1.300
1.0
0.03
800
-
90
1500
1.9
0.65
1500
V
uA
%/V
uMho
V/ V
uA
uA
V
V
uA
FB = 1.0V, Vc = 1.25V
FB = 1.5V, Vc = 1.25V
FB = 1.0V, Vc sources 25uA
FB = 1.5V, Vc sinks 25uA
Reduce Vc from 1.5V until
switching stops
Oscillator
Base Operating Frequency
Reduced Operating Frequency
Maximum Duty Cycle
FB Frequency Shift Threshold
Frequency drops to reduced
operating frequency
-
4
FB = 1V
FB = 0V
230
30
90
0.36
280
52
94
0.40
310
120
-
0.44
kHz
kHz
%
V
Dec. 2010 - Rev. 1.2.1
-
HTC
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
