MAX16922_10 Datasheet, PDF (9/17 Pages) Maxim Integrated Products – 2.2MHz, Dual, Step-Down DC-DC Converters, Dual LDOs, and RESET

2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and RESET
Pin Configurations
TOP VIEW
PV4 ¹⁶
LSUP ¹⁷
RESET ¹⁸
GND1 ¹⁹
EN ²⁰ +
MAX16922
EP
10 LX2
9 PGND2
8 OUTS2
7 GND
6 PWM
THIN QFN
TOP VIEW
GND1 1 ⁺
EN 2
BST 3
PV1 4
LX1 5
GND3 6
OUTS1 7
PWM 8
GND 9
OUTS2 10
MAX16922
EP
20 RESET
19 LSUP
18 PV4
17 OUT4
16 GND2
15 OUT3
14 PV3
13 PV2
12 LX2
11 PGND2
TSSOP
PIN
TQFN
TSSOP
1
3
2
4
3
5
4
6
5
7
6
8
7
9
Pin Description
NAME
FUNCTION
BST
PV1
LX1
GND3
OUTS1
PWM
GND
Bootstrap Capacitor Input. Connect a 0.1µF ceramic capacitor from BST to LX1.
OUT1 Supply Input. Connect a 4.7µF or larger ceramic capacitor from PV1 to PGND.
Inductor Connection for OUT1. Connect a 4.7µH inductor between LX1 and OUTS1, and a
Schottky diode between LX1 (cathode) and the power-ground plane (anode) as shown in the
Functional Diagram.
Ground. Connect GND, GND1, GND2, and GND3 together.
OUT1 Voltage-Sensing Input. Connect OUTS1 directly to the OUT1 output voltage and
bypass to power-ground plane with a minimum total capacitance of 15µF. The total
capacitance can include input bypass capacitors cascaded from OUT1, discharged by a
70Ω resistance between OUTS1 and GND3 when disabled.
PWM Control Input. Connect PWM to OUTS1 to force LX2 to switch every cycle. Connect
PWM to high for forced-PWM operation on OUT2. Connect low for auto-PWM operation to
improve efficiency at light loads.
Ground. Connect GND, GND1, GND2, and GND3 together.
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