MAX16909 Datasheet, PDF (3/18 Pages) Maxim Integrated Products – 36V, 220kHz to 1MHz Step-Down Converter with Low Operating Current

MAX16909
36V, 220kHz to 1MHz Step-Down Converter
with Low Operating Current
ELECTRICAL CHARACTERISTICS* (continued)
(V_SUP = V_SUPSW = 14V, V_EN = 14V, R_FOSC = 120kI, T_A = T_J = -40NC to +125NC, unless otherwise noted. Typical values are at
T_A = +25NC.)
PARAMETER
Skip-Mode Output Voltage
Adjustable Output Voltage
Range
Load Regulation
Line Regulation
BST Input Current
LX Current Limit
Skip-Mode Threshold
SYMBOL
V_{OUT_SKIP}
V_{OUT_ADJ}
I_{BST_ON}
I_LX
I_{SKIP_TH}
Power-Switch On-Resistance
R_ON
High-Side Switch Leakage
Current
TRANSCONDUCTANCE AMPLIFIER (COMP)
FB Input Current
I_FB
FB Regulation Voltage
V_FB
FB Line Regulation
Transconductance (from FB to
COMP)
Minimum On-Time
DV_LINE
g_m
t_{ON_MIN}
Maximum Duty Cycle
DC_MAX
OSCILLATOR FREQUENCY
Oscillator Frequency
EXTERNAL CLOCK INPUT (FSYNC)
CONDITIONS
No load, V_FB = V_BIAS
MIN
4.925
FB connected to external resistive divider 1
V_FB = V_BIAS, 30mA < I_LOAD < 3A
V_FB = V_BIAS, 6V < V_SUPSW < 36V
High-side on, V_BST - V_LX = 5V
(Note 2)
3.4
R_ON measured between SUPSW and LX,
I_LX = 1A, V_BIAS = 5V
V_SUP = 36V, V_LX = 0V, T_A = +25°C
FB connected to an external resistive
divider; 0°C < T_A < +125°C
-40°C < T_A < +125°C
6V < V_SUP < 36V
V_FB = 1V, V_BIAS = 5V (Note 2)
f_SW = 1MHz
f_SW = 220kHz
R_FOSC = 120kI
0.99
0.985
190
TYP MAX
5
5.15
10
0.5
0.02
1.5
2.5
4.1
6
300
70
150
1
10
1.0 1.01
1.0 1.015
0.02
900
80
98
99
220 250
UNITS
V
V
%
%/V
mA
A
mA
mI
FA
nA
V
%/V
FS
ns
%
kHz
FSYNC Input Current
External Input Clock Acquisition
Time
t_FSYNC
T_A = +25°C
External Input Clock Frequency
(Note 2)
External Input Clock
High Threshold
External Input Clock
Low Threshold
Soft-Start Time
V_{FSYNC_HI} V_FSYNC rising
V_{FSYNC_LO} V_FSYNC falling
t_SS
1
f_OSC +
10%
1.4
8.5
1
FA
Cycles
Hz
V
0.4
V
ms
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*The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.