MAX16909 Datasheet, PDF (9/18 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
Pin Configurations
TOP VIEW
16 15 14 13 12 11 10 9
MAX16909
EP
+
12345678
TSSOP
TOP VIEW
12 11 10 9
EN 13
I.C. 14
FSYNC 15
MAX16909
FOSC 16
+
EP
1
2
3
4
TQFN
(5mm × 5mm)
8 SUP
7 BST
6 GND
5 BIAS
PIN
TSSOP TQFN
1
15
2
16
3
1
4
2
5
3
6
4
7
5
8
6
9
7
Pin Descriptions
NAME
FSYNC
FOSC
PGOOD
OUT
FB
COMP
BIAS
GND
BST
FUNCTION
Synchronization Input. The device synchronizes to an external signal applied to FSYNC.
The external clock frequency must be 10% greater than the internal clock frequency for
proper operation. Connect FSYNC to GND if the internal clock is used.
Resistor-Programmable Switching-Frequency Setting Control Input. Connect a resistor
from FOSC to GND to set the switching frequency.
Open-Drain, Active-Low Output. PGOOD asserts when V_OUT is below the 92.5% regula-
tion point. PGOOD deasserts when V_OUT is above the 95% regulation point.
Switch Regulator Output. OUT also provides power to the internal circuitry when the out-
put voltage of the converter is set between 3V and 5V during standby mode.
Feedback Input. Connect an external resistive divider from OUT to FB and GND to set
the output voltage. Connect to BIAS to set the output voltage to 5V.
Error-Amplifier Output. Connect an RC network from COMP to GND for stable operation.
See the Compensation Network section for more details.
Linear Regulator Output. BIAS powers up the internal circuitry. Bypass with a 1FF
capacitor to ground.
Ground
High-Side Driver Supply. Connect a 0.1FF capacitor between LX and BST for proper
operation.
����������������������������������������������������������������� Maxim Integrated Products   9