Datasheet

Detailed Description
The MAX16903 is a small, current-mode buck converter
that features synchronous rectification and requires no
external compensation network. The MAX16903 is
designed for 1A output current. The MAX16903 can stay
in dropout by running at 97% duty cycle. It provides an
accurate output voltage within the input range of +6.5V
to +18V. Voltage quality can be monitored by observing
the PGOOD signal. The MAX16903 operates at 2.1MHz
(typ) frequency, which allows for small external compo-
nents, reduced output ripple, and guarantees no AM
band interference.
MAX16903
2.1MHz, High-Voltage, 1A Mini-Buck Converter
7
Maxim Integrated
Pin Description (continued)
PIN
TDFN TSSOP
NAME FUNCTION
5 8 OUTS
Buck Regulator Voltage-Sense Input. Bypass OUTS to PGND with a 10µF or larger X7R
ceramic capacitor.
6 11 PGOOD Open-Drain Power-Good Output
7 12 SYNC
Sync Input. SYNC allows the device to synchronize to other supplies. When connected to
GND or unconnected, skip mode is enabled under light loads. When connected to a clock
source or BIAS, forced PWM mode is enabled.
8 13 BIAS +5V Internal Logic Supply. Connect a 2.2µF ceramic capacitor from BIAS to GND.
9 14 GND Analog Ground
10 15 EN Enable Input. EN is high-voltage compatible. Drive EN HIGH for normal operation.
 9, 10, 16 N.C. No Connection. Not internally connected.
 EP Exposed Pad. Connect EP to PGND. Do not use EP as the only ground connection.
Functional Diagram
MAX16903
LSD
PWM
EAMP
COMP
HSD
BIAS
LX
PGND
BST
SUP
LOGIC
CONTROL
CURRENT-SENSE
AND
SLOPE COMPENSATION
SOFT-START
OSCBANDGAP
GND
V
GOOD
PGOOD
OUTS
BIAS
HVLDO
SYNC
REF
EN
CLK