NCP1855
www.onsemi.com
8
Table 4. ELECTRICAL CHARACTERISTICS
Min & Max Limits apply for T
A
between −40°C to +85°C and T
J
up to +125°C for V
IN
between 3.9 V to 7 V (Unless otherwise noted).
Typical values are referenced to T
A
= + 25°C and V
IN
= 5 V (Unless otherwise noted).
Symbol UnitMaxTypMinConditionsParameter
BOOST CONVERTER AND OTG MODE
V
IBSTL
Boost minimum input
operating range
Boost start−up 3.1 3.2 3.3 V
Boost running 2.9 3 3.1 V
V
IBSTH
Boost maximum input
operating range
4.4 4.5 4.6 V
V
OBST
Boost Output Voltage DC value measured on CAP pin, no load 5.00 5.1 5.15 V
V
OBSTAC
Boost Output Voltage accuracy Measured on CAP pin Including line and load
regulation
−3 3 %
I
BSTMX
Output current capability
Configured Mode 1000 mA
Un−configured Mode 150 mA
F
SWBST
Switching Frequency 1.35 1.5 1.65 MHz
I
BPKM
Maximum peak inductor current 2.5 A
V
OBSTOL1
Boost overload
Voltage on CAP pin, falling 4.5 4.6 4.65
V
V
OBSTOL2
Un−configured Mode, falling, Voltage on IN pin 4.3 4.4 4.5
T
OBSTOL
Boost start−up time From OTG enable to VIN > V
OBSTOL
32 ms
I
BSTPRE
Boost Pre−charge current
Un−configured Mode, Measured on IN pin
RLOAD = 29 W, CLOAD = 10 mF
350 mA
Configured Mode, Measured on IN pin
RLOAD = 5.1 W, CLOAD = 10 mF
1.1 A
T
BSTPRE
Boost Rise time Configured Mode
Measured on
VIN, VIN rising
(see Figure 3)
RLOAD = ∞,
CLOAD = 1 mF
0.3 4 ms
RLOAD = 5.1 W,
CLOAD = 10 mF
V
OBSTOV
Overvoltage protection
V
IN
rising 5.55 5.65 5.75 V
Hysteresis 25 75 125 mV
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
Figure 3. Boost Test Schematic
90%
10%
CLOADRLOAD
VIN
V
IN
T
BSTPRE
