MAX16903 Datasheet, PDF (7/13 Pages) Maxim Integrated Products – 2.1MHz, High-Voltage, 1A Mini-Buck Converter Thermal Shutdown Protection

2.1MHz, High-Voltage, 1A Mini-Buck Converter
PIN
TDFN TSSOP
5
8
6
11
7
12
8
13
9
14
10
15

9, 10, 16




NAME
OUTS
PGOOD
SYNC
BIAS
GND
EN
N.C.
EP
Pin Description (continued)
FUNCTION
Buck Regulator Voltage-Sense Input. Bypass OUTS to PGND with a 10μF or larger X7R
ceramic capacitor.
Open-Drain Power-Good Output. External pullup resistor required for automatic SKIP mode
operation.
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.
+5V Internal Logic Supply. Connect a 2.2μF ceramic capacitor from BIAS to GND.
Analog Ground
Enable Input. EN is high-voltage compatible. Drive EN HIGH for normal operation.
No Connection. Not internally connected.
Exposed Pad. Connect EP to PGND. Do not use EP as the only ground connection.
Functional Diagram
SYNC
EN
BIAS
OUTS
HVLDO
BANDGAP
REF
OSC
SOFT-START
CURRENT-SENSE
AND
SLOPE COMPENSATION
PWM
EAMP
CLK
HSD
LOGIC
CONTROL
BIAS
LSD
V_GOOD
COMP
MAX16903
BST
SUP
LX
PGND
PGOOD
GND
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.
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