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PDF MAX5099 Data sheet ( Hoja de datos )
| Número de pieza | MAX5099 | |
| Descripción | Automotive Synchronous Buck Converter | |
| Fabricantes | Maxim Integrated | |
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19-4112; Rev 0; 5/08
EVAALVUAAILTAIOBNLEKIT
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
General Description
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.
Applications
Automotive AM/FM Radio Power Supply
Automotive Instrument Cluster Display
Features
♦ Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage
Range with 80V Load-Dump Protection
♦ Dual-Output DC-DC Converter with Integrated
Power MOSFETs
♦ Adjustable Outputs from 0.8V to 0.9VIN
♦ Output Current Capability Up to 2A and 1A
♦ Switching Frequency Programmable from 200kHz
to 2.2MHz
♦ Synchronization Input (SYNC)
♦ Individual Converter Enable Input and Power-
Good Output
♦ Low-IQ (7µA) Standby Current (ON/OFF)
♦ Internal Digital Soft-Start and Soft-Stop
♦ Short-Circuit Protection on Outputs and
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
Ordering Information
PART
TEMP RANGE
MAX5099ATJ+
-40°C to +125°C
+Denotes a lead-free package.
*EP = Exposed pad.
PIN-PACKAGE
32 TQFN-EP*
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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.
1 page  
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
ELECTRICAL CHARACTERISTICS (continued)
(VDRV = VL, V+ = VL = IN_HIGH = 5.2V or V+ = IN_HIGH = 5.2V to 19V, EN_ = VL, SYNC = GND, IVL = 0mA, PGND = SGND,
CBYPASS = 0.22μF (low ESR), CVL = 4.7μF (ceramic), CV+ = 1μF (low ESR), CIN_HIGH = 1μF (ceramic), RIN_HIGH = 3.9kΩ, ROSC = 10kΩ,
TJ = -40°C to +125°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
INTERNAL DL_ DRIVERS
RDS(ON) DL_ Sink
RDS(ON) DL_ Source
Break-Before-Make Time
RONDLN
RONDLP
ISINK = 200mA
ISOURCE = 200mA
1Ω
1.8 Ω
50 ns
FSEL_1
FSEL_1 Input High Threshold
FSEL_1 Input Low Threshold
FSEL_1 Input Leakage
ON/OFF
VIH
VIL
IFSEL_1_LEAK
2V
0.8 V
2 μA
ON/OFF Input High Threshold
ON/OFF Input Low Threshold
ON/OFF Input Leakage Current
EN_ INPUTS
VIH
VIL
ION/OFF_LEAK
VON/OFF = 5V
2V
0.8 V
0.35 2
μA
EN_ Input High Threshold
VIH EN_ rising
EN_ Input Hysteresis
VEN_HYS
EN_ Input Leakage Current
IEN_LEAK
POWER-GOOD OUTPUT (PGOOD1, PGOOD2)
1.9 2.0 2.1
0.5
-1 +1
V
V
μA
PGOOD_ Threshold
VTPGOOD_ Falling
90 92.5 95 % VFB_
PGOOD_ Output Voltage
VPGOOD_
PGOOD_ Output Leakage
Current
ILKPGOOD_
OUTPUT OVERVOLTAGE PROTECTION
FB_ OVP Threshold Rising
FB_ OVP Threshold Falling
THERMAL PROTECTION
VOVP_R
VOVP_F
Thermal Shutdown
Thermal Hysteresis
TSHDN
THYST
ISINK = 3mA
V+ = VL = VIN_HIGH = VEN_ = 5.2V,
VPGOOD_ = 23V, VFB_ = 1V
Rising
0.4 V
2 μA
107 114 121 % VFB
112.5
% VFB
+165
20
°C
°C
Note 2: 100% tested at TA = +25°C and TA = +125°C. Specifications at TA = -40°C are guaranteed by design and not production
tested.
Note 3: Operating supply range (V+) is guaranteed by VL line regulation test. Connect V+ to IN_HIGH and VL for 5V operation.
Note 4: Output current is limited by the power dissipation of the package; see the Power Dissipation section in the Applications
Information section.
_______________________________________________________________________________________ 5
5 Page 
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
Pin Description
PIN
1, 32
2, 3
4
5
6
7
8
9
10
11
12
13
14
NAME
FUNCTION
SOURCE2 Converter 2 Internal MOSFET Source Connection. For buck converter operation, connect SOURCE2 to the
switched side of the inductor. For boost operation, connect SOURCE2 to PGND (Figure 5).
DRAIN2
Converter 2 Internal MOSFET Drain Connection. For buck converter operation, use the MOSFET as a high-
side switch and connect DRAIN2 to the DC-DC converters supply input rail. For boost converter operation,
use the MOSFET as a low-side switch and connect DRAIN2 to the inductor and diode junction (Figure 5).
PGOOD2
EN2
FB2
COMP2
Converter Open-Drain Power-Good Output. PGOOD2 goes low when converter 2’s output falls below 92.5%
of its set regulation voltage. Use PGOOD2 and EN1 to sequence the converters.
Converter 2 Active-High Enable Input. Connect to VL for always-on operation.
Converter 2 Feedback Input. Connect FB2 to a resistive divider between converter 2’s output and SGND to
adjust the output voltage. To set the output voltage below 0.8V, connect FB2 to a resistive voltage-divider
from BYPASS to regulator 2’s output (Figure 2). See the Setting the Output Voltage section.
Converter 2 Internal Transconductance Amplifier Output. See the Compensation section.
OSC
Oscillator Frequency Set Input. Connect a resistor from OSC to SGND (ROSC) to set the switching frequency
(see the Setting the Switching Frequency section). Set ROSC for an oscillator frequency equal to the SYNC
input frequency when using external synchronization. ROSC is still required when an external clock is
connected to the SYNC input. See the Synchronization (SYNC) section.
SYNC
External Clock Synchronization Input. Connect SYNC to a 400kHz to 4400kHz clock to synchronize the
switching frequency with the system clock. Each converter frequency is 1/2 of the frequency applied to
SYNC (FSEL_1 = VL). For FSEL_1 = SGND, the switching frequency of converter 1 becomes 1/4 of the
SYNC frequency. Connect SYNC to SGND when not used.
GATE
ON/OFF
IN_HIGH
V+
VL
Gate Drive Output. Connect to the gate of the external n-channel load-dump protection MOSFET. GATE =
IN_HIGH + 9V (typ) with IN_HIGH = 12V. GATE pulls to IN_HIGH by an internal n-channel MOSFET when V+
raises 2V above IN_HIGH. Leave GATE unconnected if the load-dump protection is not used (MOSFET not
installed).
n-Channel Switch Enable Input. Drive ON/OFF high for normal operation. Drive ON/OFF low to turn off the
external n-channel load-dump protection MOSFET and reduce the supply current to 7μA (typ). When
ON/OFF is driven low, both DC-DC converters are disabled and the PGOOD_ outputs are driven low.
Connect to V+ if the external load-dump protection is not used (MOSFET not installed).
Startup Input. IN_HIGH is protected by internally clamping to 21V (max). Connect a resistor (4kΩ max) from
IN_HIGH to the drain of the protection switch. Bypass IN_HIGH with a 4.7μF electrolytic or 1μF minimum
ceramic capacitor. Connect to V+ if the external load-dump protection is not used (MOSFET not installed).
Input Supply Voltage. V+ can range from 5.2V to 19V. Connect V+, IN_HIGH, and VL together for 4.5V to
5.5V input operation. Bypass V+ to SGND with a 1μF minimum ceramic capacitor.
Internal Regulator Output. The VL regulator is used to supply the drive current at input VDRV. When driving
VDRV, use an RC lowpass filter to decouple switching noise from VDRV to the VL regulator (see the Typical
Application Circuit). Bypass VL to SGND with a 4.7μF minimum ceramic capacitor.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MAX5099.PDF ] | |
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