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MAX16903RA33/V+TCE |MAX16903RA33V+TCEMAXIMN/a99avai2.1MHz, High-Voltage, 1A Mini-Buck Converter
MAX16903SATB50/V+T |MAX16903SATB50V+TMAXIMN/a47avai2.1MHz, High-Voltage, 1A Mini-Buck Converter
MAX16903SAUE50/V+T |MAX16903SAUE50V+TMAXIMN/a2420avai2.1MHz, High-Voltage, 1A Mini-Buck Converter


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MAX16903RA33/V+TCE-MAX16903SATB50/V+T-MAX16903SAUE50/V+T
2.1MHz, High-Voltage, 1A Mini-Buck Converter
General Description
The MAX16903 is a small, synchronous buck converter
with integrated high-side and low-side switches. The
device is designed to deliver 1A with input voltages from +3.5V to +28V while using only 25μA quiescent current at no load. Voltage quality can be monitored by
observing the PGOOD signal. The MAX16903 can
operate in dropout by running at 97% duty cycle, making
it ideal for automotive and industrial applications.
The MAX16903 operates at a 2.1MHz frequency, allow-
ing for small external components and reduced output
ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency opera-tion, skip mode (ultra-low quiescent current of 25μA), and
synchronization to an external clock. The MAX16903 can be ordered with spread-spectrum frequency modulation,
designed to minimize EMI-radiated emissions due to the modulation frequency.
The MAX16903 is available in a thermally enhanced,
3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP
package. The MAX16903 operates over the -40°C to
+125°C automotive temperature range.
Applications
●Automotive●Industrial●Military●High-Voltage Input-Power DC-DC Applications
Beneits and Features
●Meets Stringent Automotive Quality and Reliability Requirements +3.5V to +28V Input Voltage Range Allows Operation in “Cold Crank” Conditions Tolerates Input-Voltage Transients to +42V Enable-Pin Compatible from +3.3V Logic Level to
+42V 1A Minimum Output Current with Overcurrent
Protection -40°C to +125°C Automotive Temperature Range AEC-Q100 Qualified●Increased Efficiency and Reduced BOM Cost and
Board Space Integrated High- and Low-Side FETs Fixed Output Voltages (see the Selector Guide and Contact the Factory for All Available Trimmed Output-Voltage Options) 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages●Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements • 25μA Quiescent Current During Skip Mode
Operation●High Switching Frequency Allows Use of Small,
Low-Cost External Components • 2.1MHz Switching Frequency with Three Modes of
Operation Skip Mode for Efficient, Low-Power Operation • Forced Fixed-Frequency Operation • External Frequency Synchronization●Reduced EMI Emissions at the Switching Frequency • Optional Spread-Spectrum Frequency Modulation
Note: Insert the desired suffix letters (from Selector Guide) into

the blanks to indicate the output voltage. Alternative output volt-
ages available upon request.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
PARTSPREAD
SPECTRUM
TEMP
RANGE
PIN-
PACKAGE

MAX16903RAUE__/V+Disabled-40°C to
+125°C16 TSSOP-EP*
MAX16903RATB__/V+Disabled-40°C to
+125°C10 TDFN-EP*
MAX16903SAUE__/V+Enabled-40°C to
+125°C16 TSSOP-EP*
MAX16903SATB__/V+Enabled-40°C to
+125°C10 TDFN-EP*
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Ordering Information
EVALUATION KIT AVAILABLE
MAX16903_50/V+
20kΩ
2.2µF
33kΩ
SYNC
GND
VBAT LEVEL
SIGNAL
PGOOD
BIAS
SUP
*PLACE INPUT SUPPLY CAPACITORS AS CLOSE AS POSSIBLE TO THE SUP PIN. SEE THE APPLICATIONS INFORMATION SECTION FOR MORE DETAILS.
4.7µF
BST
0.1µF
4.7µH
10µF
PGND
5V AT 1A
OUTS
MAX16903_33/V+

20kΩ
2.2µF
33kΩ
SYNC
GND
VBAT LEVEL
SIGNAL
PGOOD
BIAS
SUP
4.7µF
BST
0.1µF
3.3µH
10µF
PGND
3.3V AT 1A
OUTS
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Typical Operating Circuits
(Voltages referenced to GND.)SUP, EN.................................................................-0.3V to +42V
BST to LX..................................................................-0.3V to +6V
LX.............................................................-0.3V to (VSUP + 0.3V)
BST.........................................................................-0.3V to +47VOUTS......................................................................-0.3V to +12V
SYNC, PGOOD, BIAS............................................-0.3V to +6.0V
PGND to GND .......................................................-0.3V to +0.3V
LX Continuous RMS Current.................................................1.5AOUTS Short-Circuit Duration......................................Continuous
ESD Protection
Human Body Model .........................................................±2kV
Machine Model ..............................................................±200V
Continuous Power Dissipation (TA = +70°C) TDFN (derate 24.4 mW/°C above +70°C)..................1951mW TSSOP (derate 26.1 mW/°C above +70°C) ..............2089mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°CSoldering Temperature (reflow) .......................................+260°C
TDFN Junction-to-Ambient Thermal Resistance (θJA)...........41°C/W Junction-to-Case Thermal Resistance (θJC)..................9°C/W
TSSOP Junction-to-Ambient Thermal Resistance (θJA)........38.3°C/W Junction-to-Case Thermal Resistance (θJC)..................3°C/W
(Note 1)

(VSUP = +14V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage RangeVSUP(Note 2)3.528Vt < 1s42
Supply CurrentISUP
EN = low48EN = high, no load3.3V and 5V output2535
1.8V output406590
EN = high, continuous, no switching1mA
UV LockoutVUVLOBias rising2.833.2VVUVLO,HYSHysteresis0.4
Bias VoltageVBIAS+5.5V ≤ VSUP ≤ +42V5V
Bias Current LimitIBIAS10mA
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
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.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings

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.
Package Thermal Characteristics
Electrical Characteristics
(VSUP = +14V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)
BUCK CONVERTER

Voltage Accuracy
VOUT,5VVOUT = 5V, ixed frequency
6V ≤ VSUP ≤ 18V,
ILOAD = 0 to 1A,
TA = 0°C to
+125°C
-2.0%5+2.5%
VOUT = 5V, SKIP mode (Note 3)-2.0%5+4%
VOUT,3.3VVOUT = 3.3V, ixed frequency-2.0%3.3+2.5%
VOUT = 3.3V, SKIP mode (Note 3)-2.0%3.3+4%
VOUT,1.8V
VOUT = 1.8V, ixed frequency-2.0%1.8+2.5%
VOUT = 1.8V, SKIP mode (Note 3)-2.0%1.8+4.0%
VOUT,5VVOUT = 5V, ixed frequency
6V ≤ VSUP ≤ 18V,
ILOAD = 0 to 1A,
TA = -40°C to
+125°C
-3.0%5+2.5%
VOUT = 5V, SKIP mode (Note 3)-3.0%5+4%
VOUT,3.3VVOUT = 3.3V, ixed frequency-3.0%3.3+2.5%
VOUT = 3.3V, SKIP mode (Note 3)-3.0%3.3+4%
VOUT,1.8VVOUT = 1.8V, ixed frequency-3.0%1.8+2.5%
VOUT = 1.8V, SKIP mode (Note 3)-3.0%1.8+4%
Skip-Mode Peak CurrentISKIP350mA
High-Side DMOS RDSONRON,HSVBIAS = 5V400800mΩ
Low-Side DMOS RDSONRON,LS250450mΩ
DMOS Peak Current-Limit
ThresholdIMAX1.2751.51.75A
Soft-Start Ramp TimetSS789ms
LX Rise TimetRISE,LX5ns
Minimum On-TimetON80ns
PWM Switching FrequencyfSWInternally generated1.9252.12.275MHz
SYNC Input Frequency
RangefSYNC1.82.6MHz
Spread-Spectrum RangeSSSpread-spectrum option only+6%
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Electrical Characteristics (continued)
Note 2: When the typical minimum on-time of 80ns is violated, the device skips pulses.
Note 3:
Guaranteed by design; not production tested.
(VSUP = +14V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)Electrical Characteristics (continued)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PGOOD

PGOOD ThresholdVTHR,PGDVOUT rising889398%VTHF,PGDVOUT falling889194
PGOOD DebouncetDEB10µs
PGOOD HIGH Leakage
CurrentILEAK,PGDTA = +25°C, VPGD ≤ VOUT1µA
PGOOD Output Low LevelVOUT,PGDSinking 1mA0.4V
LOGIC LEVELS

EN LevelVIH,EN2.4 V
VIL,EN0.6
EN Input CurrentIIN,ENVEN = VSUP = +42V, TA = +25°C1µA
SYNC Switching Threshold
VIH,SYNC1.4VIL,SYNC0.4
SYNC Internal PulldownRPD,SYNC200kΩ
THERMAL PROTECTION

Thermal ShutdownTSHDN175°C
Thermal Shutdown
HysteresisTSHDN,HYS15°C
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
(VSUP = +14V, TA = +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (SKIP MODE)

MAX16903 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)2422201816141210828
5V PART
3.3V PART
LINE REGULATION
(ILOAD = 1A)

MAX16903 toc03
INPUT VOLTAGE (V)
OUTPUT-VOLTAGE CHANGE (%)2481012161820142228
LOAD REGULATION

MAX16903 toc04
LOAD CURRENT (A)
OUTPUT-VOLTAGE CHANGE (%)
SKIP MODE
FFF MODE
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE

MAX16903 toc05
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)2422201816141210828
STARTUP WAVEFORM (ILOAD = 1A)

MAX16903 toc06
IINDUCTOR
1A/div
PGOOD
5V/div
VOUT
5V/div
5V/div
1ms/div
SHUTDOWN WAVEFORM (ILOAD = 1A)

MAX16903 toc07
IINDUCTOR
1A/div
PGOOD
5V/div
VOUT
5V/div
5V/div
EFFICIENCY vs. LOAD CURRENT
(5V VERSION)

MAX16903 toc01
ILOAD (A)
EFFICIENCY (%)
SKIP MODE
FFF MODE
LOAD-TRANSIENT RESPONSE
(FIXED MODE)

MAX16903 toc08
ILOAD
1A/div
PGOOD
5V/div
VOUT
200mV/div5V
COUPLED
ILOAD = 100mA TO 1A TO 100mA
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Typical Operating Characteristics
(VSUP = +14V, TA = +25°C, unless otherwise noted.)
PINNAMEFUNCTIONTDFNTSSOP
1BSTBootstrap Capacitor for High-Side Driver (0.1µF)2, 3SUPVoltage Supply Input. Connect a 4.7µF ceramic capacitor from SUP to PGND. Place the capacitor very close to the SUP pin. For the TSSOP-EP package, connect both SUP pins
together for proper operation.4, 5LXBuck Switching Node. LX is high impedance when the device is off. For the TSSOP package,
connect both LX pins together for proper operation.Power Ground. For the TSSOP-EP package, connect both PGND pins together for proper
LOAD-TRANSIENT RESPONSE
(SKIP MODE)

MAX16903 toc09
ILOAD
1A/div
PGOOD
5V/div
VOUT
200mV/div5V
AC-
COUPLED
200µs/div
ILOAD = 100mA TO 1A TO 100mA
UNDERVOLTAGE PULSE (COLD CRANK)

MAX16903 toc10
VSUP
10V/div
VOUT
5V/div
ILOAD
1A/div
PGOOD
5V/div
14V
3.5V
10ms/div
ILOAD = 500mA
STANDBY CURRENT
vs. LOAD CURRENT

MAX16903 toc11
ILOAD (mA)
SUP
(µA)
MAX169036OUTSPGOOD
TOP VIEWPGNDSYNC8LXBIAS9SUPGND
TDFN
BSTEN
MAX16903
9OUTSN.C.10PGNDN.C.11PGNDPGOOD14SUPGND15SUPEN16BSTN.C.12LXSYNC
TSSOP
LXBIAS
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Typical Operating Characteristics (continued)
Pin Description
Pin Conigurations
Detailed Description
The MAX16903 is a small, current-mode buck convert-er that features synchronous rectification and requires
no external compensation network. The MAX16903 is
designed for 1A output current. The MAX16903 can stay
accurate output voltage within the input range of +6.5V to +18V. Voltage quality can be monitored by observing the PGOOD signal. The MAX16903 operates at 2.1MHz (typ) frequency, which allows for small external components,
reduced output ripple, and guarantees no AM band inter-
PINNAMEFUNCTIONTDFNTSSOP
8OUTSBuck Regulator Voltage-Sense Input. Bypass OUTS to PGND with a 10µF or larger X7R
ceramic capacitor.11PGOODOpen-Drain Power-Good Output12SYNC
Sync Input. SYNC allows the device to synchronize to other supplies. When connected to GND
or unconnected, skip mode is enabled under light loads. When connected to a clock source or
BIAS, forced PWM mode is enabled.13BIAS+5V Internal Logic Supply. Connect a 2.2µF ceramic capacitor from BIAS to GND.14GNDAnalog Ground15ENEnable Input. EN is high-voltage compatible. Drive EN HIGH for normal operation.9, 10, 16N.C.No Connection. Not internally connected.—EPExposed Pad. Connect EP to PGND. Do not use EP as the only ground connection.
MAX16903

LSDPWM
EAMP
COMP
HSD
BIAS
PGND
BST
SUP
LOGIC
CONTROL
CURRENT-SENSE
AND
SLOPE COMPENSATION
SOFT-START
OSCBANDGAP
GND
VGOOD
PGOOD
OUTS
BIAS
HVLDO
SYNC
REF
CLK
MAX169032.1MHz, High-Voltage,
1A Mini-Buck Converter
Pin Description (continued)
Functional Diagram
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