Datasheet

MAX16993 Step-Down Controller with
Dual 2.1MHz Step-Down DC-DC Converters
www.maximintegrated.com
Maxim Integrated │ 9
Pin Description
Pin Conguration
PIN NAME FUNCTION
1 PV1
Supply Input for Buck 1 Low-Side Gate Drive. Connect a ceramic bypass capacitor of at least 0.1µF from PV1
to GND.
2 DL1 Low-Side Gate-Drive Output for Buck 1. DL1 output voltage swings from V
GND
to V
PV1
.
3 GND Power Ground for Buck 1
4 LX1
Inductor Connection for Buck 1. Connect LX1 to the switched side of the inductor. LX1 serves as the lower
supply rail for the DH1 high-side gate drive.
5 DH1 High-Side Gate-Drive Output for Buck 1. DH1 output voltage swings from V
LX1
to V
BST1
.
6 BST1
Bootstrap Capacitor Connection for High-Side Gate Drive of Buck 1. Connect a high-voltage diode between
BIAS and BST1. Connect a ceramic capacitor between BST1 and LX1. See the High-Side Gate-Drive Supply
(BST1) section.
7 V
SUP
Supply Input. Bypass V
SUP
with a minimum 0.1µF capacitor as close as possible to the device.
8 EN1 High-Voltage Tolerant, Active-High Digital Enable Input for Buck 1. Driving EN1 high enables Buck 1.
9 BIAS
5V Internal Linear Regulator Output. Bypass BIAS to GND with a low-ESR ceramic capacitor of
2.2µF minimum value. BIAS provides the power to the internal circuitry. See the Linear Regulator (BIAS)
section.
10 PV
AnalogSupply.ConnectPVtoBIASthrougha10Ωresistorandconnecta1µFceramiccapacitorfromPVto
ground.
11 FB1
FeedbackInputforBuck1.Forthexedoutput-voltageoption,connectFB1toBIASforthefactory-trimmed
(3.0Vto3.75Vor4.6Vto5.35V)xedoutput.ConnectFB1toGNDforthe3.3Vxedoutput.Fortheresistor-
divider adjustable output-voltage option, connect FB1 to a resistive divider between OUT1 and GND to adjust
the output voltage between 3.0V and 5.5V. In adjustable mode, FB1 regulates to 1.0V (typ). See the OUT1
Adjustable Output-Voltage Option section.
MAX16993
TQFN/SIDE-WETTABLE QFND
TOP VIEW
29
30
28
27
12
11
13
DL1
LX1
DH1
BST1
V
SUP
14
PV1
PV2 PGND2 PGND3 RESET2 LX3 PV3
12
RESET1
4567
2324 22 20 19 18
GND
COMP1
EP = GND
EN2
OUT1
CS1
FB1
GND
LX2
3
21
31
10
ERR
PV
32
9
SYNC
BIAS
+
SSEN
26
15
EN3
CSEL1
25
16
OUT3
EN1
RESET3
8
17
OUT2