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MAX16904SATB33/V+T-MAX16904SATB51/V+T-MAX16904SATB60/V+T
2.1MHz, High-Voltage, 600mA Mini-Buck Converter
General DescriptionThe MAX16904 is a small, synchronous buck converter
with integrated high-side and low-side switches. The
device is designed to deliver 600mA 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 MAX16904 can
operate in dropout by running at 97% duty cycle, making
it ideal for automotive and industrial applications.
The MAX16904 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 operation, SKIP mode (ultra-low quiescent current of 25μA), and
synchronization to an external clock. The MAX16904 can be ordered with spread-spectrum frequency modulation,
designed to minimize EMI-radiated emissions due to the modulation frequency.
The MAX16904 is available in a thermally enhanced,
3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP
package. The MAX16904 operates over the -40°C to
+125°C automotive temperature range.
Applications●Automotive●Industrial●Military●High-Voltage Input-Power DC-DC Applications
Features●Wide +3.5V to +28V Input Voltage Range●Tolerates Input Voltage Transients to +42V●600mA Minimum Output Current with Overcurrent
Protection●Fixed Output Voltages (See the Selector Guide and
Contact Factory for All Available Trimmed Output Voltage Options)●2.1MHz Switching Frequency with Three Modes
of Operation • 25μA Ultra-Low Quiescent Current SKIP Mode • Forced Fixed-Frequency Operation • External Frequency Synchronization●Optional Spread-Spectrum Frequency Modulation●Power-Good Output●Enable-Pin Compatible from +3.3V Logic Level
to +42V●Thermal Shutdown Protection●-40°C to +125°C Automotive Temperature Range●10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages●AEC-Q100 Qualified
Selector Guide appears at end of data sheet.
Note: Insert the desired suffix letters (from Selector Guide) into the blanks to indicate the output voltage.
Alternative output voltages available upon request.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Ordering Information
PARTSPREAD
SPECTRUM
TEMP
RANGE
PIN-
PACKAGEMAX16904RATB__/V+Disabled-40°C to
+125°C10 TDFN-EP*
MAX16904RAUE__/V+Disabled-40°C to
+125°C16 TSSOP-EP*
MAX16904SATB__/V+Enabled-40°C to
+125°C10 TDFN-EP*
MAX16904SAUE__/V+Enabled-40°C to
+125°C16 TSSOP-EP*
EVALUATION KIT AVAILABLE
MAX16904_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 600mA
OUTS
MAX16904_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 600mA
OUTS
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Typical Operating Circuits
(Voltages referenced to GND.)SUP, EN..................................................................-0.3V to +42VBST to LX (Note 1)....................................................-0.3V to +6VLX (Note 1)................................................-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 +0.3VLX Continuous RMS Current.................................................1.0AOUTS 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 2)(VSUP = +14V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVSUP(Note 3)3.528t < 1s42
Supply CurrentISUP
EN = low48µA
EN = high, no load, 3V < VOUT < 5.5V2535
EN = high, continuous, no switching1mA
UV Lockout
VUVLOBias rising2.833.2VUVLO,HYSHysteresis0.4
Bias VoltageVBIAS+5.5V ≤ VSUP ≤ +42V5V
Bias Current LimitIBIAS10mA
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Note 1: Self protected against transient voltages exceeding these limits for ≤ 50ns under normal operation and loads up to the maxi-
mum rated output current.
Note 2: 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 RatingsStresses 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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
BUCK CONVERTERVoltage Accuracy
VOUTVOUT = 5V, ixed frequency
6V ≤ VSUP ≤ 18V,
ILOAD = 0 to
600mA, TA =
-40°C to +125°C
-2.0%+2.5%
VOUT = 5V, SKIP mode (Note 4)-2.0%+4.0%
VOUT,3.3VVOUT = 3.3V, ixed frequency-2.0%3.3+2.5%
VOUT = 3.3V, SKIP mode (Note 4)-2.0%3.3+4.0%
VOUT,5V
VOUT = 5V, ixed frequency-2.0%5+2.5%
VOUT = 5V, SKIP mode (Note 4)-2.0%5+4.0%
VOUT,5.1VVOUT = 5.1V, ixed frequency-2.0%5.1+2.5%
VOUT = 5.1V, SKIP mode (Note 4)-2.0%5.1+4.0%
VOUT,5.5VVOUT = 5.5V, ixed frequency-2.0%5.5+2.5%
VOUT = 5.5V, SKIP mode (Note 4)-2.0%5.5+4.0%
VOUT,6.0VVOUT = 6.0V, ixed frequency-2.0%6.0+2.5%
VOUT = 6.0V, SKIP mode (Note 4)-2.0%6.0+4.0%
VOUT,8.0VVOUT = 8.0V, ixed frequency-2.0%8.0+2.5%
VOUT = 8.0V, SKIP mode (Note 4)-2.0%8.0+4.0%
SKIP-Mode Peak CurrentISKIP350mA
High-Side DMOS RDSONRON,HSVBIAS = 5V400800mΩ
Low-Side DMOS RDSONRON,LS250450mΩ
DMOS Peak Current-Limit
ThresholdIMAX0.851.051.22A
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%
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Electrical Characteristics (continued)
Note 3: When the typical minimum on-time of 80ns is violated, the device skips pulses.
Note 4: Guaranteed by design; not production tested.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PGOODPGOOD 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 LEVELSEN 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 PROTECTIONThermal ShutdownTSHDN175°C
Thermal Shutdown
HysteresisTSHDN,HYS15°C
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Electrical Characteristics (continued)(VSUP = +14V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)
(VSUP = +14V, TA = +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (SKIP MODE)MAX16904 toc02
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)2422201816141210828
5V PART
3.3V PART
LINE REGULATION
(ILOAD = 600mA)MAX16904 toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (%)2481012161820142228
LOAD REGULATIONMAX16904 toc04
LOAD CURRENT (A)
OUTPUT-VOLTAGE CHANGE (%)
SKIP MODE
FFF MODE
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGEMAX16904 toc05
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)2422201816141210828
STARTUP RESPONSE
(ILOAD = 600mA)MAX16904 toc06
VEN
5V/div
1A/div
VOUT
5V/div
VPGOOD
5V/div
SHUTDOWN WAVEFORM (ILOAD = 600mA)MAX16904 toc07
IINDUCTOR
0.5A/div
PGOOD
5V/div
VOUT
5V/div
5V/div
EFFICIENCY vs. LOAD CURRENTMAX16904 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
5V, SKIP MODE
5V, FFF MODE
3.3V, FFF MODE
3.3V, SKIP MODE
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Typical Operating Characteristics
(VSUP = +14V, TA = +25°C, unless otherwise noted.)
LOAD TRANSIENT RESPONSE
(3.3V, FIXED MODE)MAX16904 toc08
40µs/div
600mA
500mA/div
100mA
VOUT
50mV/div
AC-COUPLED
VBIAS
5V/div
VPGOOD
5V/div
LOAD TRANSIENT RESPONSE
(3.3V, SKIP MODE)MAX16904 toc09
40µs/div
600mA
500mA/div
100mA
VOUT
50mV/div
AC-COUPLED
VBIAS
5V/div
VPGOOD
5V/div
LOAD TRANSIENT RESPONSE
(5V, FIXED MODE)MAX16904 toc10
40µs/div
600mA
500mA/div
100mA
VOUT
50mV/div
AC-COUPLED
VBIAS
5V/div
VPGOOD
5V/div
LOAD TRANSIENT RESPONSE
(5V, SKIP MODE)MAX16904 toc11
40µs/div
600mA
500mA/div
100mA
VOUT
50mV/div
AC-COUPLED
VBIAS
5V/div
VPGOOD
5V/div
UNDERVOLTAGE PULSE
(COLD CRANK)MAX16904 toc12
10ms/div
VSUP
10V/div
VOUT
5V/div
ILOAD
500mA/div
VPGOOD
5V/div
STANDBY CURRENT
vs. LOAD CURRENTMAX16904 toc13
IIN
(µA)
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Typical Operating Characteristics (continued)
PIN
NAMEFUNCTIONTDFN-EPTSSOP-EP1BSTBootstrap 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.6, 7PGNDPower Ground. For the TSSOP-EP package, connect both PGND pins together for proper
operation.8OUTSBuck Regulator Voltage-Sense Input. Bypass OUTS to PGND with a 10µF or larger X7R
ceramic capacitor.11PGOODOpen-Drain Power-Good Output. 12SYNC
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.
MAX169046OUTSPGOOD
TOP VIEWPGNDSYNC8LXBIAS9SUPGND
TDFNBSTEN
MAX169049OUTSN.C.10PGNDN.C.11PGNDPGOOD14SUPGND15SUPEN16BSTN.C.12LXSYNC
TSSOPLXBIAS
MAX169042.1MHz, High-Voltage,
600mA Mini-Buck Converter
Pin Description
Pin Conigurations
