MAX5099ATJ+ Maxim Integrated Products, MAX5099ATJ+ Datasheet

IC CONV BUCK SYNC DL 32TQFN-EP

MAX5099ATJ+

Manufacturer Part Number
MAX5099ATJ+
Description
IC CONV BUCK SYNC DL 32TQFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX5099ATJ.pdf (27 pages)

Specifications of MAX5099ATJ+

Internal Switch(s)
Both
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.8 ~ 17.1 V
Current - Output
1A, 2A
Frequency - Switching
200kHz ~ 2.2MHz
Voltage - Input
4.5 ~ 19 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Power - Output
2.76W
Output Voltage
5.2 V
Output Current
2 A
Input Voltage
5.2 V to 19 V
Supply Current
4.2 mA
Switching Frequency
1.9 MHz
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX5099 offers a dual-output, high-switching-fre-
quency DC-DC buck converter with an integrated high-
side switch. The MAX5099 integrates two low-side
MOSFET drivers to allow each converter to drive an
external synchronous-rectifier MOSFET. Converter 1
delivers up to 2A output current, and converter 2 can
deliver up to 1A of output current. The MAX5099 inte-
grates load-dump protection circuitry that is capable of
handling load-dump transients up to 80V for automotive
applications. The load-dump protection circuit utilizes
an internal charge pump to drive the gate of an external
n-channel MOSFET. When an overvoltage or load-
dump condition occurs, the series protection MOSFET
absorbs the high voltage transient to prevent damage
to lower voltage components.
The DC-DC converter operates over a wide 4.5V to 19V
operating voltage range. The MAX5099 operates 180°
out-of-phase with an adjustable switching frequency to
minimize external components while allowing the ability
to make trade-offs between the size, efficiency, and
cost. The high switching frequency also allows these
devices to operate outside the AM band for automotive
applications. These regulators can be protected
against high voltage transients such as a load-dump
condition by using the integrated overvoltage controller.
This device utilizes voltage-mode control for stable
operation and external compensation, so that the loop
gain is tailored to optimize component selection and
transient response. The MAX5099 has a maximum duty
cycle of 92.5% and is synchronized to an external clock
fed at the SYNC input.
Additional features include internal digital soft-start,
individual enable for each DC-DC regulator (EN1 and
EN2), open-drain power-good outputs (PGOOD1 and
PGOOD2), and shutdown input (ON/OFF).
Other features of the MAX5099 include overvoltage pro-
tection and short-circuit (hiccup current limit) and ther-
mal protection. The MAX5099 is available in a thermally
enhanced, exposed pad 5mm x 5mm, 32-pin TQFN
package and operates over the automotive -40°C to
+125°C temperature range.
19-4112; Rev 0; 5/08
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 AM/FM Radio Power Supply
Automotive Instrument Cluster Display
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage
♦ Dual-Output DC-DC Converter with Integrated
♦ Adjustable Outputs from 0.8V to 0.9V
♦ Output Current Capability Up to 2A and 1A
♦ Switching Frequency Programmable from 200kHz
♦ Synchronization Input (SYNC)
♦ Individual Converter Enable Input and Power-
♦ Low-I
♦ Internal Digital Soft-Start and Soft-Stop
♦ Short-Circuit Protection on Outputs and
♦ Overvoltage Protection on Outputs with Auto
♦ Thermal Shutdown
♦ Thermally Enhanced 32-Pin TQFN Package
Pin Configuration appears at end of data sheet.
+ Denotes a lead-free package.
* EP = Exposed pad.
Range with 80V Load-Dump Protection
Power MOSFETs
to 2.2MHz
Good Output
Maximum Duty-Cycle Limit
Restart
Dissipates Up to 2.7W at +70°C
MAX5099ATJ+
PART
Q
(7µA) Standby Current (ON/OFF)
-40°C to +125°C
Ordering Information
TEMP RANGE
PIN-PACKAGE
32 TQFN-EP*
Features
IN
1

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MAX5099ATJ+ Summary of contents

Page 1

... Maximum Duty-Cycle Limit ♦ Overvoltage Protection on Outputs with Auto Restart ♦ Thermal Shutdown ♦ Thermally Enhanced 32-Pin TQFN Package Dissipates Up to 2.7W at +70°C PART MAX5099ATJ+ + Denotes a lead-free package Exposed pad. Applications Pin Configuration appears at end of data sheet. Features IN (7µA) Standby Current (ON/OFF) ...

Page 2

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ABSOLUTE MAXIMUM RATINGS V+ to SGND............................................................-0.3V to +25V V+ to IN_HIGH...........................................................-19V to +6V IN_HIGH to SGND ..................................................-0.3V to +19V IN_HIGH Maximum Input Current .......................................60mA BYPASS to SGND..................................................-0.3V to +2.5V GATE ...

Page 3

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = 0.22μF ...

Page 4

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = 0.22μF ...

Page 5

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ELECTRICAL CHARACTERISTICS (continued) (VDRV = IN_HIGH = 5. IN_HIGH = 5.2V to 19V, EN_ = 0.22μF ...

Page 6

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ( 14V, unless otherwise noted IN_HIGH OUTPUT1 EFFICIENCY vs. LOAD CURRENT 100 16V 14V IN ...

Page 7

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ( 14V, unless otherwise noted IN_HIGH LINE-TRANSIENT RESPONSE (BUCK CONVERTER) MAX5099 toc10 0V 1ms/div CONVERTER 2 LOAD-TRANSIENT RESPONSE MAX5099 toc12 100μs/div SOFT-START FROM ON/OFF ...

Page 8

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ( 14V, unless otherwise noted IN_HIGH OUT-OF-PHASE OPERATION (FSEL_1 = SGND 200ns/div EXTERNAL SYNCHRONIZATION (FSEL_1 = SGND ) 200ns/div FB_ ...

Page 9

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ( 14V, unless otherwise noted IN_HIGH BYPASS VOLTAGE vs. BYPASS CURRENT 2.000 T = +85° +125°C A 1.998 1.996 T = ...

Page 10

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection ( 14V, unless otherwise noted IN_HIGH IN_HIGH CLAMP VOLTAGE vs. CLAMP CURRENT 20 +125° +85° ...

Page 11

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection PIN NAME Converter 2 Internal MOSFET Source Connection. For buck converter operation, connect SOURCE2 to the 1, 32 SOURCE2 switched side of the inductor. For boost operation, connect SOURCE2 to ...

Page 12

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection PIN NAME Signal Ground. Connect SGND to exposed pad and to the board signal ground plane. Connect the board 15 SGND signal ground and power ground planes together at a ...

Page 13

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection V+ MAX5099 IN_HIGH ON/OFF CONVERTER 1 CLK1 OSCILLATOR FREQUENCY CONTROL BYPASS FREQUENCY FSEL_1 DIVIDER COMPARATOR EN1 DIGITAL SOFT-START SYNC MAIN OSCILLATOR OSC CLK2 EN2 ______________________________________________________________________________________ 1.8V CHARGE PUMP 20V SHUNT ...

Page 14

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Detailed Description The MAX5099 dual DC-DC converters use a pulse-width- modulation (PWM) voltage-mode control scheme. On each converter the device includes one integrated n- channel MOSFET switch and requires an ...

Page 15

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection The MAX5099 provide an input (ON/OFF) to turn on and off the external load-dump protection MOSFET. Drive ON/OFF high for normal operation. Drive ON/OFF low to turn off the external ...

Page 16

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection DRAIN2 DRAIN1 OUTPUT2 SOURCE2 SOURCE1 N DL2 MAX5099 FB2 V EN2 L PGOOD1 SEQUENCING—OUTPUT 2 DELAYED WITH RESPECT TO OUTPUT 1. Figure 1. Power-Supply Sequencing ...

Page 17

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Thermal-Overload Protection During continuous short circuit or overload at the output, the power dissipation in the IC can exceed its limit. The MAX5099 provides thermal shutdown protection with temperature hysteresis. ...

Page 18

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection V OUT_ SOURCE_ BYPASS R A FB_ MAX5099 MAX5099 R B SOURCE_ ≥ 0.8V V OUT_ Figure 2. Adjustable Output Voltage Three key inductor parameters must be specified for operation ...

Page 19

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection The allowable output ripple voltage and the maximum deviation of the output voltage during step load cur- rents determine the output capacitance and its ESR. The output ripple is comprised ...

Page 20

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection where ( ) V − Δ × where V is the voltage drop across the internal MOSFET DS switch. ΔI is the ...

Page 21

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Calculate the temperature rise of the die using the fol- lowing equation: x θ where θ is the junction-to-case thermal impedance of ...

Page 22

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Procedure 2 (See Figure 4) If the output capacitor used is a low-ESR ceramic type, the ESR frequency is usually far away from the targeted unity crossover frequency (f ). ...

Page 23

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Place a zero π × × π × × ...

Page 24

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection PCB Layout Guidelines Careful PCB layout is critical to achieve low switching losses and clean, stable operation. This is especially true for dual converters where one channel can affect the ...

Page 25

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection Figure 6. 4.5V to 5.5V Operation ______________________________________________________________________________________ 25 ...

Page 26

Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection 26 ______________________________________________________________________________________ Typical Application Circuit ...

Page 27

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 27 © 2008 Maxim Integrated Products ...

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