Electrical characteristics (continued) – Rainbow Electronics MAX5051 User Manual
Page 3
MAX5051
Parallelable, Clamped Two-Switch
Power-Supply Controller IC
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(AVIN = 12V, PVIN = 12V, V
UVLO
= V
STT
= 3V, V
CON
= 3V, R
RCOSC
= 24k
Ω, C
CSS
= 10nF, C
RCOSC
= 100pF, C
REG9
= 4.7µF,
C
REG5
= 4.7µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C. All driver, voltage-regulator, and refer-
ence outputs unconnected except for bypass capacitors.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SOFT-START/REFERENCE (CSS)
Reference Voltage
V
CSS
1.215
1.235
1.255
V
Soft-Start Pullup Current
I
CSS
70
µA
ERROR AMPLIFIER (CSS, FB, COMP)
FB Input Range
V
FB
Inferred from FB offset voltage test
0
3
V
FB Input Current
I
FB
V
FB
= V
REF
±250
nA
COMP Output Range
Inferred from FB offset voltage test
2.1
6.0
V
COMP Output Sink Current
V
FB
= 3V
20
mA
COMP Output Source Current
V
FB
= 0V
30
mA
Open-Loop Gain
G
A
2.1V < V
COMP
< 6V
80
dB
Unity-Gain Bandwidth
BW
C
COMP
= 50pF, I
COMP
=
±5mA
3
MHz
FB Offset Voltage
V
OS
V
FB
= 0 to 3V; V
COMP
= 2.1V to 6V;
I
COMP
= -5mA to +5mA
-3
+3
mV
COMP Output Slew Rate
SR
C
COMP
= 50pF
1
V/µs
PVIN UNDERVOLTAGE LOCKOUT (STT)
PVIN Undervoltage Lockout
V
PVIN
rising
22
23.5
25
V
STT Threshold
V
STT
V
STT
rising
1.18
1.24
1.30
V
STT Input Impedance
R
STT
100
k
Ω
INTEGRATING FAULT PROTECTION (FLTINT)
FLTINT Source Current
I
FLTINT
V
FLTINT
= 0V
90
µA
FLTINT Shutdown Threshold
V
FLTINTSD
V
FLTINT
= rising
2.9
V
FLTINT Restart Hysteresis
V
FLTINTHY
0.9
V
OSCILLATOR (RCOSC, SYNCIN, SYNCOUT)
PWM Period
t
S
R
RCOSC
= 24k
Ω, C
RCOSC
= 100pF
3.9
µs
Maximum PWM Duty Cycle
D
MAX
R
RCOSC
= 24k
Ω, C
RCOSC
= 100pF
48
%
Maximum RCOSC Frequency
f
RCOSCMAX
1
MHz
Maximum SYNCIN Frequency
f
SYNCIN
50% duty cycle
500
kHz
SYNCIN High-Level Voltage
VH
SYNCIN
Pulse rising
2.1
V
SYNCIN Low-Level Voltage
VL
SYNCIN
Pulse falling
0.8
V
SYNCIN Pulldown Resistor
100
k
Ω
SYNCIN Rising to SYNCOUT
Falling Delay
30
ns
SYNCIN Falling to SYNCOUT
Rising Delay
70
ns