MAX16922_10 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 2.2MHz, Dual, Step-Down DC-DC Converters, Dual LDOs, and RESET

19-5039; Rev 1; 5/10
EVAALVUAAILTAIOBNLEKIT
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and RESET
General Description
The MAX16922 power-management integrated circuit
(PMIC) is designed for medium power-level automotive
applications and integrates multiple supplies in a small
footprint. The device includes one high-voltage step-
down converter (OUT1) and three low-voltage cascad-
ed DC-DC converters (OUT2, OUT3, OUT4). OUT1 and
OUT2 are step-down DC-DC converters, and OUT3/
OUT4 are linear regulators. The device also includes a
reset output (RESET) and a high-voltage-compatible
enable input (EN).
The 1.2A output high-efficiency, step-down DC-DC con-
verter (OUT1) operates from a voltage up to 28V contin-
uous and is protected from load-dump transients up to
45V. The 600mA output high-efficiency step-down DC-
DC converter (OUT2) runs from a voltage up to 5.5V.
The two 300mA LDO linear regulators offer low dropout
of only 130mV (typ). The power-good RESET output
provides voltage monitoring for OUT1 and OUT2.
OUT1 and OUT2 use fast 2.2MHz PWM switching and
small external components. The high-voltage converter
(OUT1) enters skip mode automatically under light
loads to prevent an overvoltage condition from occur-
ring at the output. The low-voltage synchronous DC-DC
converter (OUT2) can operate in forced-PWM mode to
prevent any AM band interference or high-efficiency
auto-PWM mode.
The MAX16922 includes overtemperature shutdown
and overcurrent limiting. All devices are designed to
operate from -40°C to +125°C ambient temperature.
Features
o 1.2A High-Efficiency 2.2MHz DC-DC Converter
3.7V to 28V Operating Supply Voltage
45V Load-Dump Protection
Output Voltage: 3.0V to 5.5V
o 600mA High-Efficiency 2.2MHz DC-DC Converter
2.7V to 5.5V Supply Voltage
Output Voltage: 1.0V to 3.9V
180° Out-of-Phase Operation
Forced-PWM and Auto-PWM Modes
o LDO Linear Regulators
OUT3: 1.0V to 4.15V at 300mA
OUT4: 1.0V to 4.15V at 300mA
Separate Inputs for Increased Efficiency
o Enable Input
o RESET Output Monitoring on OUT1 and OUT2
o Overtemperature and Short-Circuit Protection
o Available in
5mm x 5mm x 0.8mm, 20-Pin TQFN-EP
4.5mm x 6.5mm, 20-Pin TSSOP-EP
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX16922ATP_ /V+* -40°C to +125°C 20 TQFN-EP**
MAX16922AUP_ /V+* -40°C to +125°C 20 TSSOP-EP**
*Insert the desired suffix letters (from the Selector Guide) into
the blank “_” to complete the part number.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
**EP = Exposed pad.
Typical Operating Circuit
V_PV1
4.7µF
V_OUT1
4.7µF
V_OUT2
V_OUT3
4.7µF
4.7µF
V_OUT4
4.7µF
PV1
EN
PWM
PV3
OUT3
GND1
GND3
PV4
OUTS2
LX2
PGND2
PV2
MAX16922 ^BST
LX1
OUTS1
OUT4
GND
GND2
LSUP
EP
RESET
2.2µH
V_OUT2
10µF
4.7µF
0.1µF
4.7µH
V_OUT1
10µF
V_OUT1
1µF
20kΩ
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.