MAX5074
Power IC with Integrated MOSFETs for Isolated IEEE
802.3af PD and Telecom Power-Supply Applications
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
HVIN
= 12V, C
INBIAS
= 1µF, C
REGOUT
= 2.2µF, R
RTCT
= 25kΩ, 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
Propagation Delay to XFRMRL t
dILIM
From CS rising (10mV overdrive) to
XFRMRL rising
160 ns
BOOST VOLTAGE CIRCUIT (See Figure 1, QB)
Driver Output Delay t
PPWMD
200 ns
One-Shot Pulse Width t
PWQB
300 ns
QB R
DS(ON)
Sinking 20mA 30 60 Ω
THERMAL SHUTDOWN
Shutdown Temperature T
SH
Temperature rising +160 °C
Thermal Hysteresis T
HYST
15 °C
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO Threshold V
UVLO
V
UVLO
rising 1.14 1.38 V
UVLO Hysteresis V
HYST
140 mV
UVLO Input Bias Current I
BUVLO
V
UVLO
= 3V -100 +100 nA
SUPPLY CURRENT
From V
HVIN
= 11V to 76V, V
CSS
= 0V,
V
INBIAS
= 11V
0.7 2
From V
INBIAS
= 11V to 76V, V
CSS
= 0V,
V
HVIN
= 76V
4.4 6.0
Supply Current
From V
HVIN
= 76V 7
mA
Standby Supply Current V
UVLO
= 0V 1 mA
Note 1: All limits at -40°C are guaranteed by design and not production tested.
Note 2: Output switching frequency is half of oscillator frequency.
UNDERVOLTAGE LOCKOUT THRESHOLD
vs. TEMPERATURE
MAX5074 toc01
TEMPERATURE (°C)
V
UVLO
(V)
11095-25 -10 5 35 50 6520 80
1.2425
1.2450
1.2475
1.2500
1.2525
1.2550
1.2575
1.2600
1.2400
-40 125
UVLO RISING
STANDBY CURRENT vs. TEMPERATURE
MAX5074 toc02
TEMPERATURE (°C)
STANDBY CURRENT (µA)
1109565 80-10 5 20 35 50-25
35
70
105
140
175
210
245
280
315
350
0
-40 125
I
HVIN
V
UVLO
=
0V
HVIN INPUT CURRENT
vs. TEMPERATURE
MAX5074 toc03
TEMPERATURE (°C)
I
HVIN
(mA)
11095-25 -10 5 35 50 6520 80
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.0
-40 125
V
HVIN
= 76V
INBIAS FLOATING
REGOUT = DRVIN
Typical Operating Characteristics
(V
HVIN
= 48V, V
INBIAS
= 15V, C
INBIAS
= 1µF, C
REGOUT
= 2.2µF, R
RTCT
= 25kΩ, 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.)
