Datasheet

MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V (for MAX17500, bring V
IN
up to 23.6V for startup), 10nF bypass capacitors at IN and V
CC
, R12 = 15kΩ (MAX17499A/
MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the
Typical Application Circuit ), NDRV = open,
V
UVLO/EN
= +1.4V, V
FB
= +1.0V, COMP = open, V
CS
= 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND ...............................................................-0.3V to +30V
IN Clamp (internal shunt) Current .........................................5mA
V
CC
to GND............................................................-0.3V to +13V
FB, COMP, UVLO/EN, RT, CS to GND .....................-0.3V to +6V
UFLG to GND .........................................................-0.3V to +30V
NDRV to GND.............................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
10-Pin μMAX (derate 5.6mW/°C above +70°C) ........444.4mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UVLO/STARTUP
Bootstrap UVLO Wake-Up Level V
SUVR
V
IN
rising (MAX17500 only) 19.68 21.6 23.60 V
Bootstrap UVLO Shutdown Level V
SUVF
V
IN
falling (MAX17500 only) 9.05 9.74 10.43 V
UVLO/EN Wake-Up Threshold V
ULR2
UVLO/EN rising 1.215 1.23 1.245 V
UVLO/EN Shutdown Threshold V
ULF2
UVLO/EN falling 1.14 1.17 1.20 V
UVLO/EN Input Current I
UVLO
V
UVLO/EN
≤ 2V -50 +50 nA
UVLO/EN Hysteresis 60 mV
IN Supply Current In UVLO I
START
V
IN
= 19V, MAX17500 only when in
bootstrap UVLO
50 90 μA
IN Input Voltage Range V
IN
MAX17499 only 9.5 24.0 V
UVLO/EN steps up from 1V to 1.4V 3
UVLO/EN to UFLG Propagation
Delay (Figure 3)
UVLO/EN steps down from 1.4V to 1V 0.6
μs
t
EXTR
UVLO/EN steps up from 1V to 1.4V 3 10 ms
UVLO/EN to NDRV Propagation
Delay (Figure 3)
t
EXTF
UVLO/EN steps down from 1.4V to 1V 150 210 300 μs
t
BUVR
V
IN
steps up from 9V to 24V (MAX17500
only)
5
Bootstrap UVLO Propagation
Delay
t
BUVF
V
IN
steps down from 24V to 9V
(MAX17500 only)
1
μs
UFLG Low Output Voltage V
UFLG
I
UFLG
= 5mA sinking 1.5 V
UFLG High Output Leakage
Current
V
UFLG
= 25V 0.1 1 μA
INTERNAL SUPPLY
V
CC
Regulator Set Point V
CCSP
V
IN
= 10.8V to 24V, sinking 1μA to 20mA
from V
CC
7.0 10.5 V
IN Supply Current After Startup I
IN
V
IN
= 24V 2 4 mA
Shutdown Supply Current UVLO/EN = low 50 90 μA