Datasheet

MAX17598/MAX17599
Low I
Q
, Wide-Input Range, Active Clamp
Current-Mode PWM Controllers
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V (for MAX17598, bring V
IN
up to 21V for startup), V
CS
= V
DITHER
= V
FB
= V
OVI
= V
SGND
= V
PGND
= 0V, V
EN/UVLO
= +2V,
AUXDRV = NDRV = SS = COMP = SLOPE = unconnected, R
RT
= 25kI, R
DT
= 10kI, C
VIN
= 1FF, C
VDRV
= 1FF, T
A
= T
J
= -40NC to
+125NC, unless otherwise noted. Typical values are at T
A
= T
J
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERNAL LDO (V
DRV
)
V
DRV
Output Voltage Range V
VDRV
8V < V
IN
< 15V and 0mA < I
VDRV
<
50mA (MAX17598)
7.1 7.4 7.7
V
6V < V
IN
< 15V and 0mA < I
VDRV
<
50mA (MAX17599)
4.7 4.9 5.1
V
DRV
Current Limit I
VDRV-MAX
70 100 mA
V
DRV
Dropout V
VDRV-DO
V
IN
= 4.5V, I
VDRV
= 20mA (MAX17599) 4.2 V
OVERVOLTAGE PROTECTION (OVI)
OVI Overvoltage Threshold
V
OVIR
V
OVI
rising 1.16 1.21 1.26
V
V
OVIF
V
OVI
falling 1.1 1.15 1.2
OVI Masking Delay t
OVI-MD
2 Fs
OVI Input Leakage Current I
OVI
V
OVI
= 1V, T
A
= +25NC -100 +100 nA
OSCILLATOR (RT)
NDRV Switching Frequency
Range
f
SW
100 1000 kHz
NDRV Switching Frequency
Accuracy
-8 +8 %
Maximum Duty Cycle D
MAX
f
SW
= 400KHz, R
DT
= 10kI 71 72.5 74 %
SYNCHRONIZATION (DITHER/SYNC)
Synchronization Logic-High
Input
V
IH-SYNC
3 V
Synchronization Pulse Width 50 ns
Synchronization Frequency
Range
f
SYNC
1.1 x
f
SW
1.3 x
f
SW
DITHERING RAMP GENERATOR (DITHER/SYNC)
Charging Current 45 50 55 FA
Discharging Current 43 50 57 FA
Ramp-High Trip Point 2
V
Ramp-Low Trip Point 0.4