Rainbow Electronics MAX17083 - Manual (Page 7)

MAX17083
Low-Voltage, Internal Switch,
Step-Down Regulator
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Pin Description
PIN NAME FUNCTION
1, 2, 17, 18 LX
Inductor Connection for the Internal 5A Step-Down Converter. Connect LX to the switched side of
the inductor.
3, 4 IN
Power Input Connection to the Drain of the Internal HS MOSFET. Bypass to PGND with a 10μF or
greater ceramic capacitor close to the IC to minimize parasitic inductance.
5 FREQ
Four-Level Switching Frequency (f
SW
) Selection Pin
FREQUENCY PIN SWITCHING FREQUENCY (MHz)
V CC 1.5
OPEN 1.0
REF 0.75
GND 0.5
6 POK
Open-Drain Power-Good Output. POK is pulled low if FB is more than 12% (typ) above or below the
nominal regulation threshold. POK is held low during soft-start and in shutdown. POK becomes
high impedance when FB is in regulation.
7 REF
1.25V Reference Voltage Output. Bypass REF to analog ground with a 0.1μF ceramic capacitor.
The reference sources up to 50μA for external loads. Loading REF degrades output voltage
accuracy according to the REF load regulation error.
8, 9, 10 GND Analog Ground
11, 19, 24 N.C. No Connection
12 FB
Feedback Input for the Internal 5A Step-Down Converter. FB regulation level can be preset by the
SET pin.
13 SET
Four-Level FB Threshold Selection Pin
FB THRESHOLD SELECTION PIN FB REGULATION VOLTAGE (V)
V CC 1.8
OPEN 1.5
REF 1.1
GND 0.75
14 V CC
5V Bias Supply Input for the Internal Switching Regulator Drivers. Bypass with a 1μF or greater
ceramic capacitor. Provides power for the BST driver supplies.
15 EN
Switching Regulator Enable Input. When EN is pulled low, LX is high impedance. When EN is
driven high, the controller enables the 5A internal switching regulator.
16 BST
Boost Flying Capacitor Connection for the Internal 5A Step-Down Converter. The MAX17083
includes an internal boost switch/diode connected between V
CC and BST. Connect to an external
0.1μF ceramic capacitor as shown in Figure 1.
20–23 PGND Power Ground
EP GND Ground. Connect the exposed backside pad to analog ground.