19-5039; Rev 1; 5/10
KIT
ATION
EVALU
BLE
AVAILA
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and
RESET
General Description
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
MAX16922
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.
Ordering Information
PART
MAX16922ATP_ /V+*
MAX16922AUP_ /V+*
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
20 TQFN-EP**
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
PV1
EN
PWM
PV3
PV2
BST
0.1µF
4.7µH
LX1
OUTS1
V
OUT1
10µF
V
OUT1
1µF
EP
RESET
20kΩ
4.7µF
OUTS2
LX2
PGND2
2.2µH
V
OUT2
10µF
MAX16922
V
OUT3
4.7µF
V
OUT2
4.7µF
V
OUT4
4.7µF
OUT4
GND
GND2
OUT3
GND1
GND3
PV4
LSUP
________________________________________________________________
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.
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and
RESET
MAX16922
ABSOLUTE MAXIMUM RATINGS
PV1, EN to GND .....................................................-0.3V to +45V
LX1 to GND.................................................-0.5V to (PV1 + 0.3V)
LX2 to GND.................................................-0.5V to (PV2 + 0.3V)
BST to LX1.............................................................-0.3V to +6.0V
PV2, PV3, PV4, OUTS1, PWM,
RESET
to GND_....-0.3V to +6.0V
OUTS2 .......................................................-0.3V to (PV2 + 0.3V)
OUT3 .........................................................-0.3V to (PV3 + 0.3V)
OUT4 .........................................................-0.3V to (PV4 + 0.3V)
LX1 RMS Current .................................................................2.0A
LX2 RMS Current .................................................................1.2A
PGND2 to GND_....................................................-0.3V to +0.3V
LSUP to GND............................................................-0.3V to +6V
OUTS_, OUT_ Output Short-Circuit Duration .............Continuous
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN-EP (derate 31.3 mW/°C above +70°C)....... 2500mW
20-Pin TSSOP-EP (derate 26.5 mW/°C above +70°C)..... 2122mW
Junction-to-Case Thermal Resistance (
θ
JC
) (Note 1)
20-Pin TQFN-EP .......................................................... 2.7°C/W
20-Pin TSSOP-EP ........................................................... 2°C/W
Junction-to-Ambient Thermal Resistance (
θ
JA
) (Note 1)
20-Pin TQFN-EP ........................................................... 32°C/W
20-Pin TSSOP-EP ..................................................... 37.7°C/W
ESD
HB
(all pins) ...................................................................±2kV
ESD
MM
(all pins) ................................................................±200V
ESD
CDM
(corner pins) .......................................................±750V
ESD
CDM
(other pins)..........................................................±500V
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
TSSOP...........................................................................+240°C
TQFN.............................................................................+260°C
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
PV1
= 13.5V, V
PV2
= V
PV3
= V
OUT1
, V
PV4
= V
OUT2
; T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
(Note 3)
Operation < 500ms
PV1 rising
PV1 falling
PV1 falling (option enabled)
6V
≤
V
PV1
≤
28V
EN = low
Internally generated
Duty cycle = 20% to 90%;
I
LOAD
= 300mA to 1.2A
SKIP mode (Note 4)
DMOS On-Resistance
Current-Limit Threshold
Soft-Start Ramp Time
Maximum Output Current
LX1 Leakage Current
Maximum Duty Cycle
Minimum Duty Cycle
DC
MAX
DC
MIN
f
SW
= 2.2MHz
I
OUT1
(V
OUT1
+ 1.0V)
≤
V
PV1
≤
28V
V
PV1
= 12V, LX1 = GND or V
PV1
;
T
A
= -40°C to +85°C
1.2
±1
94
20
V
PV1
= 4V, V
BST
= 9V, I
LX1
= 0.2A
1.4
2.0
-3
-2
300
1.75
2.2
4.75
2.85
3.7
3.3
6.45
0.65
V
LSUP
I
PV1
f
SW
V
OUT1
5.0
14
2.2
2.4
+3
+4
700
2.1
mΩ
A
ms
A
µA
%
%
5.45
CONDITIONS
MIN
3.7
TYP
MAX
28
45
4.0
UNITS
OUT1—SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Supply-Voltage Range
PV1 Undervoltage Lockout
BST Refresh Load Enable
BST Refresh Load Hysteresis
LSUP Regulator Voltage
Supply Current
PWM Switching Frequency
Voltage Accuracy
V
PV1
V
UVLO,R
V
UVLO,F
V
BRLE
V
V
V
V
V
µA
MHz
%
2
_______________________________________________________________________________________
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and
RESET
ELECTRICAL CHARACTERISTICS (continued)
(V
PV1
= 13.5V, V
PV2
= V
PV3
= V
OUT1
, V
PV4
= V
OUT2
; T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
OUTS1 Discharge Resistance
SYMBOL
CONDITIONS
EN = low (or optionally EN = high and
V
PV1
< 5.7V)
V
PV2
f
SW
V
OUT2
Fully operational
Internally generated
Duty cycle = 20% to 90%;
I
LOAD
= 1mA to 600mA, PWM = high
SKIP mode (Note 4)
pMOS On-Resistance
nMOS On-Resistance
pMOS Current-Limit Threshold
nMOS Zero-Crossing Threshold
Soft-Start Ramp Time
Maximum Output Current
LX2 Leakage Current
Duty-Cycle Range
OUTS2 Discharge Resistance
OUT3—LDO REGULATOR
Input Voltage
Voltage Accuracy
Load Regulation
Dropout Voltage
Current Limit
Power-Supply Rejection Ratio
Shutdown Output Resistance
OUT4—LDO REGULATOR
Input Voltage
Voltage Accuracy
Load Regulation
Dropout Voltage
Current Limit
Power-Supply Rejection Ratio
Shutdown Output Resistance
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
(Note 4)
150
175
15
°C
°C
I
OUT4
= 30mA, f = 1kHz
EN = low
V
PV4
V
OUT4
(V
OUT4
+ 0.4V)
≤
V
PV4
≤
5.5V, I
LOAD
= 1mA
I
LOAD
= 0 to 300mA
V
PV4
= 1.8V, I
LOAD
= 250mA (Note 4)
1.7
-2
-0.2
130
450
57
1
320
5.5
+2
V
%
%
mV
mA
dB
kΩ
I
OUT3
= 30mA, f = 1kHz
EN = low
V
PV3
V
OUT3
V
OUT3
+ 0.4V
≤
V
PV3
≤
5.5V, I
LOAD
= 1mA
I
LOAD
= 0 to 300mA
V
PV3
= 1.8V, I
LOAD
= 250mA (Note 4)
1.7
-2
-0.2
130
450
57
1
320
5.5
+2
V
%
%
mV
mA
dB
kΩ
I
OUT2
V
OUT2
+ 0.5V
≤
V
PV2
≤
5.5V
V
PV2
= 6V, LX2 = PGND2 or V
PV2
;
T
A
= -40°C to +85°C
Forced-PWM mode only, minimum duty
cycle in skip mode is 0% (Note 4)
EN = 0V
15
70
600
±1
100
V
PV2
= 5.0V, I
LX2
= 0.2A
V
PV2
= 5.0V, I
LX2
= 0.2A
0.75
2.7
2.0
-3
-2
150
200
0.9
50
1.5
2.2
MIN
TYP
70
MAX
UNITS
Ω
MAX16922
OUT2—SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Supply-Voltage Range
PWM Switching Frequency
Voltage Accuracy
5.5
2.4
+3
+4
250
350
1.05
V
MHz
%
%
mΩ
mΩ
A
mA
ms
mA
µA
%
Ω
_______________________________________________________________________________________
3
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and
RESET
MAX16922
ELECTRICAL CHARACTERISTICS (continued)
(V
PV1
= 13.5V, V
PV2
= V
PV3
= V
OUT1
, V
PV4
= V
OUT2
; T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
RESET
OUT1 OV Threshold
OUT1 Reset Threshold
OUT2 Reset Threshold
Reset option 1 (see the
Selector Guide)
Reset option 2 (see the
Selector Guide)
Percentage of nominal output
Reset timeout option 1 (see the
Selector
Guide)
Reset timeout option 2 (see the
Selector
Guide)
Output-High Leakage Current
Output Low Level
UV Propagation Time
EN LOGIC INPUT
EN Threshold Voltage
EN Threshold Hysteresis
Input Current
PWM LOGIC INPUT
Input High Level
Input Low Level
Logic-Input Current
PWM rising
PWM falling
0
≤
V
PWM
≤
5.5V
1
1.8
0.4
V
V
µA
V
EN
= 5V
EN rising
1.4
1.8
0.4
0.5
2.2
V
V
µA
Sinking -3mA
28
85
75
85
110
90
80
90
14.9
ms
1.9
1
0.4
µA
V
µs
95
85
95
%
%
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Reset Timeout Period
Note 2:
All units are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 3:
Once PVI exceeds undervoltage-lockout rising threshold 4.0V and the device is in regulation.
Note 4:
Guaranteed by design. Not product tested.
4
_______________________________________________________________________________________
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and
RESET
Typical Operating Characteristics
(V
PV1
= 13.5V, V
PV2
= V
PV3
= V
OUT1
, V
PV4
= V
OUT2
; T
A
= +25°C, unless otherwise specified.)
MAX16922
OUT1 EFFICIENCY vs. LOAD CURRENT
MAX16922 toc01
OUT1 EFFICIENCY vs. LOAD CURRENT
MAX16922 toc02
OUT2 EFFICIENCY vs. LOAD CURRENT
MAX16922 toc03
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
PV1 = 18V
PV1 = 8V
PV1 = 13.5V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
PV1 = 13.5V
100
T
A
= -40°C
90
EFFICIENCY (%)
T
A
= +125°C
T
A
= +25°C
T
A
= +125°C
T
A
= +25°C
80
70
60
PV2 = 5V
OUT2 = 2.7V
50
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
LOAD CURRENT (A)
0.1
0.2
0.3
0.4
0.5
0.6
LOAD CURRENT (A)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
LOAD CURRENT (A)
SUPPLY CURRENT vs. TEMPERATURE
MAX16922 toc04
NORMALIZED OUT1 VOLTAGE
vs. LOAD CURRENT
MAX16922 toc05
OUT1 VOLTAGE vs. V
PV1
I
OUT1
= 1A
5.15
5.10
OUT1 VOLTAGE (V)
5.05
5.00
4.95
4.90
4.85
4.80
MAX16922 toc06
1.8
1.7
SUPPLY CURRENT (mA)
1.6
1.5
1.4
1.3
1.2
1.1
1.0
NO LOAD
PWM = GND
2.0
NORMALIZED OUT1 VOLTAGE (%)
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
5.20
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
I
PV1
(A)
6
9
12
V
PV1
(V)
15
18
POWER-UP ENABLE TURNING ON
MAX16922 toc07
POWER-UP/DOWN AT
THERMAL SHUTDOWN
EN
10V/div
OUT1
5V/div
OUT2
2V/div
OUT3
2V/div
OUT4
1V/div
MAX16922 toc08
RESET
5V/div
OUT1
5V/div
OUT2
2V/div
OUT3
2V/div
OUT4
1V/div
1ms/div
2ms/div
_______________________________________________________________________________________
5
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