Datasheet

MAX16936
36V, 220kHz to 2.2MHz Step-Down Converter
with 28µA Quiescent Current
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
SUP
= V
SUPSW
= 14V, V
EN
= 14V, L1 = 2.2FH, C
IN
= 4.7FF, C
OUT
= 22FF, C
BIAS
= 1FF, C
BST
= 0.1FF, R
FOSC
= 12kI,
T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT VOLTAGE (OUT)
FPWM Mode Output Voltage
(Note 2)
V
OUT_5V
V
FB
= V
BIAS
, 6V < V
SUPSW
< 36V,
MAX16936____A/V+, fixed-frequency
mode
4.9 5 5.1
V
V
OUT_3.3V
V
FB
= V
BIAS
, 6V < V
SUPSW
< 36V,
MAX16936____B/V+, fixed-frequency
mode
3.234 3.3 3.366
Skip Mode Output Voltage
(Note 3)
V
OUT_5V
No load, V
FB
= V
BIAS
, MAX16936____A/
V+, skip mode
4.9 5 5.15
V
V
OUT_3.3V
V
FB
= V
BIAS
, 6V < V
SUPSW
< 36V,
MAX16936____B/V+, skip mode
3.234 3.3 3.34
Load Regulation V
FB
= V
BIAS
, 300mA < I
LOAD
< 2.5A 0.5 %
Line Regulation V
FB
= V
BIAS
, 6V < V
SUPSW
< 36V 0.02 %/V
BST Input Current
I
BST_ON
High-side MOSFET on, V
BST
- V
LX
= 5V 1 1.5 2 mA
I
BST_OFF
High-side MOSFET off, V
BST
- V
LX
= 5V,
T
A
= +25°C
5 FA
LX Current Limit I
LX
Peak inductor current 3 3.75 4.5 A
LX Rise Time R
FOSC
= 12kW 4 ns
Skip Mode Current Threshold I
SKIP_TH
T
A
= +25°C 150 300 400 mA
Spread Spectrum Spread spectrum enabled f
OSC
Q6%
High-Side Switch
On-Resistance
R
ON_H
I
LX
= 1A, V
BIAS
= 5V 100 220 mI
High-Side Switch Leakage
Current
High-side MOSFET off, V
SUP
= 36V,
V
LX
= 0V, T
A
= +25NC
1 3 FA
Low-Side Switch
On-Resistance
R
ON_L
I
LX
= 0.2A, V
BIAS
= 5V 1.5 3
I
Low-Side Switch
Leakage Current
V
LX
= 36V, T
A
= +25NC 1 FA
TRANSCONDUCTANCE AMPLIFIER (COMP)
FB Input Current I
FB
20 100 nA
FB Regulation Voltage V
FB
FB connected to an external resistor
divider, 6V < V
SUPSW
< 36V (Note 4)
0.99 1.0 1.015 V
FB Line Regulation DV
LINE
6V < V
SUPSW
< 36V 0.02 %/V
Transconductance
(from FB to COMP)
g
m
V
FB
= 1V, V
BIAS
= 5V 700 FS
Minimum On-Time t
ON_MIN
(Note 3) 80 ns
Maximum Duty Cycle DC
MAX
98 %