NCP1546
ELECTRICAL CHARACTERISTICS (continued)
(0°C < T
J
< 70°C, 4.5 V< V
IN
< 40 V; unless otherwise specified.)
Characteristic
General
Quiescent Current
Shutdown Quiescent Current
Boost Operating Current
Minimum Boost Voltage
Startup Voltage
Minimum Output Current
4. Guaranteed by design, not 100% tested in production.
I
SW
= 0 A
V
SHDNB
= 0 V
V
BOOST
− V
SW
= 2.5 V
Note 4
−
−
−
−
6.0
−
2.2
−
4.0
1.0
15
−
3.3
7.0
7.5
5.0
40
2.5
4.4
12
mA
mA
mA/A
V
V
mA
Test Conditions
Min
Typ
Max
Unit
SHDNB
SYNC
V
IN
5.0
mA
2.9 V LDO
Voltage
Regulator
Shutdown
Comparator
+
−
+
1.3 V −
S
R
Q
Artificial
Ramp
Oscillator
Thermal
Shutdown
BOOST
Output
Driver
V
SW
∑
+
−
SHDNB
1.46 V
PWM
Comparator
Current
Limit
Comparator
I
REF
+
−
V
FB
−
+
1.27 V
+
−
Error
Amplifier
+
0.32 V −
+
Frequency
and Current
Limit Foldback
I
FOLDBACK
GND
5
−
V
C
Figure 2. Block Diagram
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