Electrical characteristics (continued) – Rainbow Electronics MAX5074 User Manual
Page 3
MAX5074
Power IC with Integrated MOSFETs for Isolated IEEE
802.3af PD and Telecom Power-Supply Applications
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
HVIN
= 12V, C
INBIAS
= 1µF, C
REGOUT
= 2.2µF, R
RTCT
= 25k
Ω, C
RTCT
= 100pF, C
BST
= 0.22µF, V
CSS
= V
CS
= 0V, V
RAMP
= V
UVLO
= 3V,
T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REGOUT LDO (REGOUT)
INBIAS floating, V
HVIN
= 11V to 76V
8.3
9.2
REGOUT Voltage Set Point
V
REGOUT
V
INBIAS
= V
HVIN
= 11V to 76V
9.5
11.0
V
INBIAS floating, V
HVIN
= 15V, I
REGOUT
= 0
to 30mA
0.25
REGOUT Load Regulation
V
INBIAS
= V
HVIN
= 15V, I
REGOUT
= 0 to
30mA
0.25
V
INBIAS floating, I
REGOUT
= 30mA
1.25
REGOUT Dropout Voltage
V
INBIAS
= V
HVIN
, I
REGOUT
= 30mA
1.25
V
REGOUT Undervoltage Lockout
Threshold
REGOUT rising
6.6
7.4
V
REGOUT Undervoltage Lockout
Threshold Hysteresis
REGOUT falling
0.7
V
SOFT-START (CSS)
Soft-Start Current
I
CSS
33
µA
INTEGRATING FAULT PROTECTION (FLTINT)
FLTINT Source Current
I
FLTINT
80
µA
FLTINT Trip Point
FLTINT rising
2.7
V
FLTINT Hysteresis
0.8
V
INTERNAL POWER MOSFETs (See Figure 1, QH and QL)
On-Resistance
R
DS(ON)
V
DRVIN
= V
BST
= 9V,
V
XFRMRH
= V
SRC
= 0V, I
DS
= 50mA
0.4
0.8
Ω
Off-State Leakage Current
-5
+5
µA
Total Gate Charge Per FET
15
nC
HIGH-SIDE DRIVER
Low-to-High Delay
Driver delay until FET V
GS
reaches 0.9 x
(V
BST
- V
XFRMRH
) and is fully on
80
ns
High-to-Low Delay
Driver delay until FET V
GS
reaches 0.1 x
(V
BST
- V
XFRMRH
) and is fully off
40
ns
Driver Output Voltage
BST to XFRMRH with high side on
8
V
LOW-SIDE DRIVER
Low-to-High Delay
Driver delay until FET V
GS
reaches 0.9 x
V
DRVIN
and is fully on
80
ns
High-to-Low Delay
Driver delay until FET V
GS
reaches 0.1 x
V
DRVIN
and is fully off
40
ns
CURRENT-LIMIT COMPARATOR (CS)
Current-Limit Threshold Voltage
V
ILIM
140
156
172
mV
Current-Limit Input Bias Current
I
BILIM
0 < V
CS
< 0.3V
-2
+2
µA