MAX16955_12 Datasheet, PDF (3/26 Pages) Maxim Integrated Products – 36V, 1MHz Step-Down Controller with Low Operating Current

MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
ELECTRICAL CHARACTERISTICS (continued)
(V_SUP = V_EN = 14V, C_IN = 10µF, C_OUT = 94µF, C_BIAS = 2.2µF, C_BST = 0.1µF, R_FOSC = 76.8kΩ, T_A = T_J = -40°C to +125°C, unless
otherwise noted. Typical values are at T_A = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
FB Line Regulation
Transconductance (from FB to
COMP)
g_m,EA
V_EN = V_SUP, 6V < V_SUP < 36V (Note 4)
0.02
%/V
1200
µS
Error-Amplifier Output
Impedance
R_OUT,EA
30
M
Operating Frequency
Minimum On-Time
Maximum FSYNC Frequency
Minimum FSYNC Frequency
FSYNC Switching Threshold
High
f_SW
R_FOSC = 76.8k

R_FOSC = 30.1k

360
400
440
kHz
1000
t_ON(MIN)
80
ns
f_FSYNC(MAX)
1100
kHz
f_FSYNC(MIN)
f_FSYNC > 110% of internal frequency (20%
duty cycle), f_SW = 220kHz
242
kHz
V_FSYNC,HI
1.4
V
FSYNC Switching Threshold Low
FSYNC Internal Pulldown
Resistance
V_FSYNC,LO
0.4
V
1
M
CURRENT LIMIT
CS Input Current
Output Input Current
CS Current-Limit Voltage
Threshold
I_CS
I_OUT
V_LIMIT
V_CS = V_OUT = 0V or V_BIAS (Note 4)
During normal operation
V_FB = V_BIAS
V_CS - V_OUT, V_BIAS = 5V, V_OUT
2.5V
-1
+1
µA
22
µA
32
68
80
92
mV
FAULT DETECTION
Output Overvoltage Trip
Threshold
V_FB,OV V_OUT = V_FB, rising edge
108
113
118 %V_FB
Output Overvoltage Trip
Hysteresis
2.5
%
Output Overvoltage Fault
Propagation Delay
t_OVP
Rising edge
Falling edge
25
µs
25
Output Undervoltage Trip
Threshold
V_FB,UV
V_OUT = V_FB; with respect to slewed FB
threshold, falling edge
83
88
93 %V_FB
Output Undervoltage Trip
Hysteresis
2.5
%
Output Undervoltage
Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
V_PGOOD,L
I_PGOOD
T_SHDN
Falling edge
Rising edge (excluding startup)
I_SINK = 3mA
(Note 5)
(Note 5)
25
µs
25
0.4
V
1
µA
+175
°C
15
°C
Maxim Integrated
3