Datasheet

MAX16935
36V, 3.5A, 2.2MHz Step-Down Converter
with 28µA Quiescent Current
8Maxim Integrated
Pin Descriptions
Pin Configurations
PIN
NAME FUNCTION
TQFN TSSOP
16 1 SYNCOUT
Open-Drain Clock Output. SYNCOUT outputs 180N out-of-phase signal relative to the
internal oscillator. Connect to OUT with a resistor between 100I and 1kW for 2MHz
operation. For low frequency operation, use a resistor between 1kW and 10kW.
1 2 FSYNC
Synchronization Input. The device synchronizes to an external signal applied to
FSYNC. Connect FSYNC to AGND to enable skip mode operation. Connect to BIAS or
to an external clock to enable fixed-frequency forced PWM mode operation.
2 3 FOSC
Resistor-Programmable Switching Frequency Setting Control Input. Connect a resistor
from FOSC to AGND to set the switching frequency.
3 4 OUT
Switching Regulator Output. OUT also provides power to the internal circuitry when
the output voltage of the converter is set between 3V to 5V during standby mode.
4 5 FB
Feedback Input. Connect an external resistive divider from OUT to FB and AGND to
set the output voltage. Connect to BIAS to set the output voltage to 5V.
5 6 COMP
Error Amplifier Output. Connect an RC network from COMP to AGND for stable
operation. See the Compensation Network section for more information.
6 7 BIAS
Linear Regulator Output. BIAS powers up the internal circuitry. Bypass with a 1FF
capacitor to ground.
7 8 AGND Analog Ground
8 9 BST
High-Side Driver Supply. Connect a 0.1FF capacitor between LX and BST for
proper operation.
9 10 EN
SUP Voltage Compatible Enable Input. Drive EN low to disable the device. Drive EN
high to enable the device.
+
TSSOP
13
4
LX
OUT
14
3
LX
FOSC
15
2
PGND
FSYNC
16
1
TOP VIEW
PGOODSYNCOUT
10
7
EN
BIAS
11
6
SUP
COMP
9
8
BST
AGND
12
5
SUPSW
FB
EP
MAX16935
+
EP
15
16
14
13
6
5
7
FOSC
FB
8
FSYNC
SUPSW EN LX
12
PGND
4
12 11 9
SYNCOUT
BST
AGND
BIAS
COMP
OUT SUP
3
10
LX
TQFN
PGOOD
MAXX16935