Datasheet

MAX16932/MAX16933
2.2MHz, 36V, Dual Buck
with 20µA Quiescent Current
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC
under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Regulated Feedback Voltage V
FB1,2
0.99 1.0 1.01 V
Feedback Leakage Current I
FB1,2
T
A
= +25NC 0.01 1 FA
Feedback Line Regulation Error V
IN
= 3.5V to 36V, V
FB
= 1V 0.001 %/V
Transconductance
(from FB_ to COMP_)
g
m
V
FB
= 1V, V
BIAS
= 5V 1200 2400 FS
Dead Time
MAX16932: DL_ low to DH_ high 35
ns
MAX16932: DH_ low to DL_ high 60
MAX16933: DL_ low to DH_ high 60
MAX16933: DH_ low to DL_ high 100
Maximum Duty Cycle Buck 1, buck 2 95 98.5 %
Minimum On-Time t
ON(MIN)
Buck 1, buck 2 50 ns
PWM Switching Frequency f
SW
MAX16932 1 2.2
MHz
MAX16933 0.2 1
Buck 2 Switching Frequency
MAX16932ATIT/V+,
MAX16932ATIU/V+ only
1/2f
SW
MHz
Switching Frequency Accuracy
MAX16932: R
FOSC
= 13.7kI,
V
BIAS
= 5V
1.98 2.2 2.42 MHz
MAX16933: R
FOSC
= 80.6kI,
V
BIAS
= 5V
360 400 440 kHz
Spread-Spectrum Range Spread spectrum enabled ±6 %
FSYNC INPUT
FSYNC Frequency Range
MAX16932: Minimum sync pulse of 100ns 1.2 2.4 MHz
MAX16933: Minimum sync pulse of 400ns 240 1200 kHz
FSYNC Switching Thresholds
High threshold 1.5
V
Low threshold 0.6
CS Current-Limit Voltage
Threshold
V
LIMIT1,2
V
CS
– V
OUT
, V
BIAS
= 5V, V
OUT
R 2.5V 64 80 96 mV
Skip Mode Threshold 15 mV
Soft-Start Ramp Time
Buck 1 and buck 2, fixed soft-start time
regardless of frequency
2 6 10 ms
Phase Shift Between Buck1 and
Buck 2
180
°
LX1, LX2 Leakage Current V
IN
= 6V, V
LX_
= V
IN
, T
A
= +25NC 0.01 FA
DH1, DH2 Pullup Resistance V
BIAS
= 5V, I
DH_
= -100mA 10 20
I
DH1, DH2 Pulldown Resistance V
BIAS
= 5V, I
DH_
= +100mA 2 4
I
DL1, DL2 Pullup Resistance V
BIAS
= 5V, I
DL_
= -100mA 4 8
I
DL1, DL2 Pulldown Resistance V
BIAS
= 5V, I
DL_
= +100mA 1.5 3
I