MAX16904RAUE33/V+ Maxim Integrated Products, MAX16904RAUE33/V+ Datasheet

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MAX16904RAUE33/V+

Manufacturer Part Number
MAX16904RAUE33/V+
Description
IC CONV MINI-BUCK 1A 16TSSOP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX16904RAUE33/V+

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
600mA
Frequency - Switching
2.1MHz
Voltage - Input
3.5 ~ 28 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP (0.173", 4.40mm Width) Exposed pad
Output Voltage
3.3 V
Input Voltage
3.5 V to 28 V
Switching Frequency
2.1 MHz
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
SMD/SMT
Duty Cycle (max)
97 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The 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 oper-
ate 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 fre-
quency 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.
19-5481; Rev 2; 3/11
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.
Automotive
Industrial
Military
High-Voltage Input-Power DC-DC Applications
________________________________________________________________ Maxim Integrated Products
General Description
Applications
600mA Mini-Buck Converter
♦ Wide +3.5V to +28V Input Voltage Range
♦ Tolerates Input Voltage Transients to +42V
♦ 600mA Minimum Output Current with Overcurrent
♦ Fixed Output Voltages (+3.3V and +5V)
♦ 2.1MHz Switching Frequency with Three Modes of
♦ Optional Spread-Spectrum Frequency Modulation
♦ Power-Good Output
♦ Enable-Pin Compatible from +3.3V Logic Level to
♦ Thermal Shutdown Protection
♦ -40°C to +125°C Automotive Temperature Range
♦ 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages
♦ AEC-Q100 Qualified
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.
Selector Guide appears at end of data sheet.
MAX16904RATB__/V+
MAX16904RAUE__/V+
MAX16904SATB__/V+
MAX16904SAUE__/V+
2.1MHz, High-Voltage,
Protection
Operation
+42V
25µA Ultra-Low Quiescent Current SKIP Mode
Forced Fixed-Frequency Operation
External Frequency Synchronization
PART
Ordering Information
SPECTRUM
SPREAD
Disabled
Disabled
Enabled
Enabled
-40°C to
-40°C to
-40°C to
-40°C to
RANGE
+125°C
+125°C
+125°C
+125°C
TEMP
Features
PIN-
PACKAGE
10 TDFN-EP*
16 TSSOP-EP*
10 TDFN-EP*
16 TSSOP-EP*
1

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MAX16904RAUE33/V+ Summary of contents

Page 1

... Automotive Industrial Military High-Voltage Input-Power DC-DC Applications ________________________________________________________________ Maxim Integrated Products 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. 2.1MHz, High-Voltage, 600mA Mini-Buck Converter ♦ Wide +3.5V to +28V Input Voltage Range ♦ ...

Page 2

High-Voltage, 600mA Mini-Buck Converter 5V AT 600mA 10μF 3.3V AT 600mA 10μF * PLACE INPUT SUPPLY CAPACITORS AS CLOSE AS POSSIBLE TO THE SUP PIN. SEE THE APPLICATIONS INFORMATION SECTION FOR MORE DETAILS. 2 _______________________________________________________________________________________ SUP * 4.7μF MAX16904_50/V+ ...

Page 3

ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) SUP, EN..................................................................-0.3V to +42V BST to LX..................................................................-0.3V to +6V LX..............................................................-0. BST .........................................................................-0.3V to +47V OUTS ......................................................................-0.3V to +12V SYNC, PGOOD, BIAS............................................-0.3V to +6.0V PGND to GND .......................................................-0.3V to +0.3V LX Continuous ...

Page 4

High-Voltage, 600mA Mini-Buck Converter ELECTRICAL CHARACTERISTICS (continued +14V -40°C to +125°C, unless otherwise noted. Typical values are at T SUP A J PARAMETER SYMBOL SKIP-Mode Peak Current High-Side DMOS RDS R ON Low-Side ...

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T = +25°C, unless otherwise noted.) SUP A EFFICIENCY vs. LOAD CURRENT 100 5V, SKIP MODE 3.3V, SKIP MODE 5V, FFF MODE 60 50 3.3V, FFF MODE 0.1 ...

Page 6

High-Voltage, 600mA Mini-Buck Converter (V = +14V +25°C, unless otherwise noted.) SUP A LOAD TRANSIENT RESPONSE (3.3V, FIXED MODE) 40μs/div LOAD TRANSIENT RESPONSE (5V, FIXED MODE) 40μs/div UNDERVOLTAGE PULSE (COLD CRANK) 10ms/div 6 _______________________________________________________________________________________ Typical Operating Characteristics ...

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TOP VIEW + BST 1 SUP 2 MAX16904 LX 3 PGND 4 OUTS 5 PIN NAME TDFN-EP TSSOP- BST SUP PGND 5 8 OUTS 6 11 PGOOD 7 ...

Page 8

High-Voltage, 600mA Mini-Buck Converter EN HVLDO BIAS SOFT-START OUTS COMP V GOOD 8 _______________________________________________________________________________________ SYNC REF BANDGAP OSC CURRENT-SENSE AND SLOPE COMPENSATION CONTROL PWM EAMP MAX16904 PGOOD Functional Diagram BST SUP CLK HSD LX LOGIC BIAS LSD PGND GND ...

Page 9

Detailed Description The MAX16904 is a small, current-mode buck converter that features synchronous rectification and requires no external compensation network. The device is designed for 600mA output current, and can stay in dropout by running at 97% duty cycle. It ...

Page 10

High-Voltage, 600mA Mini-Buck Converter If the input voltage is reduced and the device approaches dropout, it tries to turn on the high-side FET continuously. To maintain gate charge on the high- side FET, the BST capacitor must be periodically ...

Page 11

ESR of the input capacitor). The total voltage ripple is the sum of ΔV and ΔV . Assume the input-voltage Q ESR ripple from the ESR and the capacitor discharge is equal to 50% each. The following equations show the ...

Page 12

High-Voltage, 600mA Mini-Buck Converter 2) Solder the exposed pad to a large copper plane area under the device. To effectively use this copper area as heat exchanger between the PCB and ambi- ent, expose the copper area on the ...

Page 13

... OUTPUT VOLTAGE PART MAX16904RATB50/V+ MAX16904RAUE50/V+ MAX16904SATB50/V+ MAX16904SAUE50/V+ MAX16904RATB33/V+ MAX16904RAUE33/V+ MAX16904SATB33/V+ MAX16904SAUE33/V+ MAX16904RAUE18/V+ Note: All devices operate over the -40°C to +125°C automotive temperature range. + Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part Exposed pad. Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ 2.1MHz, High-Voltage, ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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