Rainbow Electronics MAX5099 User Manual
General Description
The MAX5099 offers a dual-output, high-switching-frequency DC-DC buck converter with an integrated highside 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 integrates 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 loaddump 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 protection and short-circuit (hiccup current limit) and thermal 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 0.9V
IN
♦ 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-I
Q
(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
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
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.
Pin Configuration appears at end of data sheet.
EVALUATION KIT
AVAILABLE
+
Denotes a lead-free package.
*
EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX5099ATJ+
-40°C to +125°C
32 TQFN-EP*
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDRV = VL, V+ = VL= IN_HIGH = 5.2V or V+ = IN_HIGH = 5.2V to 19V, EN_ = VL, SYNC = GND, IVL= 0mA, PGND = SGND,
C
BYPASS
= 0.22μF (low ESR), CVL= 4.7μF (ceramic), CV+= 1μF (low ESR), C
IN_HIGH
= 1μF (ceramic), R
IN_HIGH
= 3.9kΩ, R
OSC
= 10kΩ,
T
J
= -40°C to +125°C, unless otherwise noted.) (Note 2)
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.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information
on package thermal considerations refer to www.maxim-ic.com/thermal-tutorial
.
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 to V+.............................................................-0.3V to +12V
GATE to SGND .......................................................-0.3V to +36V
SGND to PGND .....................................................-0.3V to +0.3V
V
L
to SGND..................-0.3V to the Lower of +6V or (V+ + 0.3V)
VDRV to SGND .........................................................-0.3V to +6V
BST1/VDD1, BST2/VDD2, DRAIN_,
PGOOD_ to SGND ..............................................-0.3V to +30V
ON/OFF to SGND ...............................-0.3V to (IN_HIGH + 0.3V)
BST1/VDD1 to SOURCE1,
BST2/VDD2 to SOURCE2......................................-0.3V to +6V
SOURCE_ to SGND................................................-0.6V to +25V
EN_ to SGND............................................................-0.3V to +6V
OSC, FSEL_1, COMP_, SYNC,
FB_ to SGND..............................................-0.3V to (V
L
+ 0.3V)
DL_ to PGND ...........................................-0.3V to (VDRV + 0.3V)
SOURCE1, DRAIN1 Peak Current ..............................5A for 1ms
SOURCE2, DRAIN2 Peak Current ..............................3A for 1ms
V
L
, BYPASS to
SGND Short Circuit ................... Continuous, Internally Limited
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFN-EP (derate 34.5mW/°C above +70°C)..2759mW
Package Junction-to-Ambient
Thermal Resistance (θ
JA
) (Note 1).............................29.0°C/W
Package Junction-to-Case
Thermal Resistance (θ
JC
) (Note 1) ..............................1.7°C/W
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
Input Voltage Range V+
V+ Operating Supply Current I
V+ Standby Supply Current I
V+STBY
Efficiency η
Q
V+ = IN_HIGH 5.2 19
V
= V+ = IN_HIGH, Figure 6 (Note 3) 4.5 5.5
L
VL unloaded, no switching, V
V
= 0V, PGOOD_ unconnected,
EN_
V+ = V
V
OUT1
V
OUT2
= 300kHz
f
SW
OVERVOLTAGE PROTECTOR
IN_HIGH Clamp Voltage IN_HIGH I
IN_HIGH Clamp Load
Regulation
IN_HIGH Supply Current I
IN_HIGH Standby Supply
Current
V+ to IN_HIGH Overvoltage
Clamp
IN_HIGH
I
IN_HIGHSTBY
V
OV
= 10mA 19 20 21 V
SINK
1mA < I
V
= V
EN_
V
IN_HIGH
V
ON/OFF
unconnected, V
VOV = V+ - V
= 14V
IN_HIGH
= 5V at 1.5A,
= 3.3V at 0.75A,
= 1V 4.2 6.0 mA
FB_
V+ = VL = 5.2V 86
V+ = 12V 85
0.75 1.1 mA
V+ = 16V 85
< 50mA 160 mV
SINK
PGOOD_
= V
ON/OFF
= 0V , V
IN_HIGH
= V
PGOOD_
IN_HIGH
= 0V,
GATE
= 14V
= V + =
= 14V
, I
= -1mA 1.20 1.85 2.50 V
GATE
270 600 μA
79μA
V
%
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________ 3
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,
C
BYPASS
= 0.22μF (low ESR), CVL= 4.7μF (ceramic), CV+= 1μF (low ESR), C
IN_HIGH
= 1μF (ceramic), R
IN_HIGH
= 3.9kΩ, R
OSC
= 10kΩ,
T
J
= -40°C to +125°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN_HIGH Startup Voltage
GATE Charge Current I
GATE Output Voltage
GATE Turn-Off Pulldown
Current
IN_HIGH
UVLO
GATE_CH
V
GATE
V
IN_HIGH
I
GATE_PD
Rising, ON/OFF = IN_HIGH, GATE rising 3.6 4.1
Falling, ON/OFF = IN_HIGH, GATE falling 3.45
V
V
V+ = V
I
GATE
-
V+ = V
I
GATE
V
V
IN_HIGH
= V+ = 0V
GATE
IN_HIGH
= 1μA
IN_HIGH
= 1μA
IN_HIGH
= 5V
GATE
= V
ON/OFF
= V
= V
= 14V, V
= 14V,
ON/OFF
ON/OFF
ON/OFF
= 4.5V,
= 14V,
= 0V, V+ = 0V,
20 45 80 μA
4.0 5.3 7.5
V
V
9
3.6 mA
STARTUP/VL REGULATOR
VL Undervoltage-Lockout Trip
Level
VL Undervoltage-Lockout
Hysteresis
VL Output Voltage V
VL LDO Short-Circuit Current I
VL LDO Dropout Voltage V
UVLO V
L
VL_SHORT
LDO
falling 3.9 4.1 4.3 V
L
180 mV
I
SOURCE_
V+ = V
I
SOURCE_
= 0 to 40mA, 5.5V ≤ V+ ≤ 19V 5.0 5.2 5.5 V
= 5.2V 130 mA
IN_HIGH
= 40mA, V+ = V
= 4.5V 300 550 mV
IN_HIGH
BYPASS OUTPUT
BYPASS Voltage V
BYPASS Load Regulation ΔV
BYPASS
BYPASS
I
= 0μA 1.98 2.00 2.02 V
BYPASS
0 < I
< 100μA (sourcing) 2 5 mV
BYPASS
SOFT-START/SOFT-STOP
f
Digital Ramp Period SoftStart/Soft-Stop
Internal 6-bit DAC 2048
SW
Clock
Cycles
Soft-Start/Soft-Stop Steps 64 Steps
VOLTAGE-ERROR AMPLIFIER
FB_ Input Bias Current I
FB_ Input-Voltage Set Point V
FB_ to COMP_
Transconductance
FB_
FB_
g
-40°C ≤ TA ≤ +85°C 0.783 0.8 0.809
-40°C ≤ TA ≤ +125°C 0.785 0.814
M
1.4 2.4 3.4 mS
250 nA
V
INTERNAL MOSFETS
I
= 100mA, BST1/VDD1 to
On-Resistance High-Side
MOSFET Converter 1
R
ON1
SWITCH
V
SOURCE1
I
SWITCH
V
SOURCE1
= 5.2V
= 100mA, BST1/VDD1 to
= 4.5V
195
mΩ
208 355
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
4 _______________________________________________________________________________________
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,
C
BYPASS
= 0.22μF (low ESR), CVL= 4.7μF (ceramic), CV+= 1μF (low ESR), C
IN_HIGH
= 1μF (ceramic), R
IN_HIGH
= 3.9kΩ, R
OSC
= 10kΩ,
T
J
= -40°C to +125°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
SWITCH
V
On-Resistance High-Side
MOSFET Converter 2
Minimum Converter 1 Output
Current
Minimum Converter 2 Output
Current
Converter 1/Converter 2
MOSFET DRAIN_ Leakage
Current
R
ON2
I
OUT1
I
OUT2
I
LK12
SOURCE2
I
SWITCH
V
SOURCE2
V
OUT1
V
OUT2
V
= V
EN1
19V, V
= 100mA, BST2/VDD2 to
= 5.2V
= 100mA, BST2/VDD2 to
= 4.5V
280
300 520
= 5V, V+ = 12V (Note 4) 2 A
= 3.3V, V+ = 12V (Note 4) 1 A
= 0V, VDS = 19V, V
EN2
SOURCE_
= 0V
DRAIN_
=
20 μA
mΩ
Internal Weak Low-Side Switch
On-Resistance
R
ONLSSW_ILSSW
INTERNAL SWITCH CURRENT LIMIT
Internal Switch Current-Limit
Converter 1
Internal Switch Current-Limit
Converter 2
SWITCHING FREQUENCY
PWM Maximum Duty Cycle D
Switching Frequency Range f
Switching Frequency f
Switching Frequency Accuracy
SYNC Frequency Range f
SYNC High Threshold V
SYNC Low Threshold V
SYNC Input Leakage I
SYNC Input Minimum Pulse
Width
SYNCH
SYNCL
SYNC_LEAK
t
SYNCIN
Sync to Source 1 Phase Delay SYNC
I
CL1
I
CL2
MAX
SW
SW
SYNC
PHASEROSC
= 30mA 22 Ω
V+ = V
V
BST_/VDD_
V+ = V
V
BST_/VDD_
= 5.2V, VL = VDRV =
IN_HIGH
= 5.2V
= 5.2V, VL = VDRV =
IN_HIGH
= 5.2V
2.8 3.45 4.3 A
1.75 2.10 2.60 A
SYNC = SGND, fSW = 1.25MHz 90 92 100 %
200 2200 kHz
R
= 6.81kΩ, each converter 1.7 1.9 2.1 MHz
OSC
5.6kΩ < R
10kΩ < R
< 10kΩ, 1% 5
OSC
< 62.5kΩ, 1% 7
OSC
Each converter switching frequency is half
of the SYNC input frequency,
FSEL_1 = V
(see the Setting the
L
400 4400 kHz
Switching Frequency section)
2V
0.8 V
2μA
100 ns
= 62.5kΩ 90 Degrees
%
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________ 5
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,
C
BYPASS
= 0.22μF (low ESR), CVL= 4.7μF (ceramic), CV+= 1μF (low ESR), C
IN_HIGH
= 1μF (ceramic), R
IN_HIGH
= 3.9kΩ, R
OSC
= 10kΩ,
T
J
= -40°C to +125°C, unless otherwise noted.) (Note 2)
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 V
L
line regulation test. Connect V+ to IN_HIGH and VLfor 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERNAL DL_ DRIVERS
R
R
DL_ Sink R
DS(ON)
DL_ Source R
DS(ON)
ONDLN
ONDLP
I
= 200mA
SINK
I
SOURCE
= 200mA
1.8
Break-Before-Make Time 50
FSEL_1
FSEL_1 Input High Threshold V
FSEL_1 Input Low Threshold V
FSEL_1 Input Leakage I
FSEL_1_LEAK
IH
IL
2V
ON/OFF
ON/OFF Input High Threshold V
ON/OFF Input Low Threshold V
ON/OFF Input Leakage Current I
ON/OFF_LEAKVON/OFF
IH
IL
= 5V 0.35 2 μA
2V
EN_ INPUTS
EN_ Input High Threshold V
EN_ Input Hysteresis V
EN_ Input Leakage Current I
EN_HYS
EN_LEAK
IH
EN_ rising 1.9 2.0 2.1 V
0.5 V
-1 +1 μA
POWER-GOOD OUTPUT (PGOOD1, PGOOD2)
1
Ω
Ω
ns
0.8 V
2μA
0.8 V
PGOOD_ Threshold V
PGOOD_ Output Voltage V
PGOOD_ Output Leakage
Current
TPGOOD_
PGOOD_ISINK
I
LKPGOOD_
Falling 90 92.5 95 % V
= 3mA 0.4 V
V+ = VL = V
V
PGOOD_
= 23V, V
IN_HIGH
= V
FB_
EN_
= 1V
= 5.2V,
2μA
OUTPUT OVERVOLTAGE PROTECTION
FB_ OVP Threshold Rising V
FB_ OVP Threshold Falling V
OVP_R
OVP_F
107 114 121 % V
112.5 % V
THERMAL PROTECTION
Thermal Shutdown T
Thermal Hysteresis T
SHDN
HYST
Rising +165 °C
20 °C
FB_
FB
FB
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
6 _______________________________________________________________________________________
Typical Operating Characteristics
(V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means that N1 is shorted externally.)
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc01
LOAD CURRENT (A)
OUTPUT1 EFFICIENCY (%)
1.81.61.2 1.40.6 0.8 1.00.4
10
20
30
40
50
60
70
80
90
100
0
0.2 2.0
VIN = 8V
VIN = 14V
VIN = 16V
V
OUT
= 5V
f
SW
= 1.85MHz
OUTPUT2 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc02
LOAD CURRENT (A)
OUTPUT2 EFFICIENCY (%)
0.90.7 0.80.4 0.5 0.60.3
10
20
30
40
50
60
70
80
90
100
0
0.2 1.0
VIN = 4.5V
VIN = 5.5V
V
OUT
= 3.3V
f
SW
= 1.85MHz
VIN = 14V
VIN = 8V
VIN = 16V
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc03
LOAD CURRENT (A)
OUTPUT1 EFFICIENCY (%)
1.81.61.2 1.40.6 0.8 1.00.4
10
20
30
40
50
60
70
80
90
100
0
0.2 2.0
VIN = 8V
VIN = 14V VIN = 16V
V
OUT
= 5V
f
SW
= 300kHz
L1 = 18μH
OUTPUT2 EFFICIENCY
vs. LOAD CURRENT
MAX5099 toc04
LOAD CURRENT (A)
OUTPUT2 EFFICIENCY (%)
0.90.80.6 0.70.4 0.50.30.2 1.0
10
20
30
40
50
60
70
80
90
100
0
VIN = 16V
VIN = 8V
VIN = 14V
VIN = 5.5V
VIN = 4.5V
V
OUT
= 3.3V
f
SW
= 300kHz
L2 = 27μH
OUTPUT1 VOLTAGE
vs. LOAD CURRENT
MAX5099 toc05
LOAD CURRENT (A)
OUTPUT1 VOLTAGE (V)
1.81.61.41.21.00.80.60.4
4.92
4.94
4.96
4.98
5.00
4.90
0.2 2.0
VIN = 8V
VIN = 14V
VIN = 16V
V
OUT
= 5V
f
SW
= 1.85MHz
OUTPUT2 VOLTAGE
vs. LOAD CURRENT
MAX5099 toc06
LOAD CURRENT (A)
OUTPUT2 VOLTAGE (V)
0.90.80.70.60.50.40.3
3.25
3.24
3.26
3.27
3.28
3.29
3.30
3.23
0.2 1.0
VIN = 4.5V
VIN = 16V
VIN = 14V
VIN = 8V
VIN = 5.5V
V
OUT
= 3.3V
f
SW
= 1.85MHz
VL OUTPUT VOLTAGE
vs. CONVERTER SWITCHING FREQUENCY
MAX5099 toc07
CONVERTER SWITCHING FREQUENCY (kHz)
V
L
OUTPUT VOLTAGE (V)
1600 19001300700 1000
4.2
4.4
4.6
4.8
5.0
5.2
5.4
4.0
400 2200
VIN = 4.5V
VIN = 5.5V
VIN = 8V
VIN = 19V
VIN = 5V
BOTH CONVERTERS SWITCHING
FSEL_1 = V
L
EACH CONVERTER SWITCHING
FREQUENCY vs. R
OSC
MAX5099 toc08
R
OSC
(kΩ)
SWITCHING FREQUENCY (MHz)
604020
1
0
80
10
0.1
CONVERTER 1, CONVERTER 2
CONVERTER 1
FSEL_1 = VL,
FSEL_1 = GND,
EACH CONVERTER SWITCHING
FREQUENCY vs. TEMPERATURE
MAX5099 toc09
TEMPERATURE (°C)
SWITCHING FREQUENCY (MHz)
-5 30 65 100
1
10
0.1
-40 135
0.3MHz
0.6MHz
1.25MHz
1.85MHz
2.2MHz
FSEL_1 = V
L
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means that N1 is shorted externally.)
LINE-TRANSIENT RESPONSE
(BUCK CONVERTER)
CONVERTER 2
LOAD-TRANSIENT RESPONSE
0V
1ms/div
MAX5099 toc10
MAX5099 toc12
CONVERTER 1
LOAD-TRANSIENT RESPONSE
100μs/div
SOFT-START/SOFT-STOP FROM EN1
MAX5099 toc11
MAX5099 toc13
fSW = 1.85MHz
= 5.0V
V
OUT1
AC-COUPLED
200mV/div
I
OUT1
1A/div
0A
EN1
5V/div
0V
= 5V/2A
V
OUT1
5V/div
0V
P
GOOD1
5V/div
0V
V
IN
5V/div
0V
= 5.0V/1.5A
V
OUT1
AC-COUPLED
200mV/div
= 3.3V/0.75A
V
OUT2
AC-COUPLED
200mV/div
= 3.3V
V
OUT2
AC-COUPLED
200mV/div
I
OUT2
500mA/div
0A
100μs/div
1ms/div
OUT-OF-PHASE OPERATION
SOFT-START FROM ON/OFF
0V
0V
0V
0V
2ms/div
MAX5099 toc14
ON/OFF
5V/div
= EN1 = EN2
V
L
5V/div
GATE
10V/div
V+
10V/div
V
= 5V/2A
OUT1
5V/div
0V
0V
0V
0V
(FSEL_1 = V
200ns/div
)
L
MAX5099 toc15
SOURCE1
10V/div
SOURCE2
10V/div
DL1
10V/div
DL2
10V/div
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means that N1 is shorted externally.)
FB_ VOLTAGE
vs. TEMPERATURE
MAX5099 toc20
TEMPERATURE (°C)
FB_ VOLTAGE (V)
10065-5 30
0.790
0.795
0.800
0.805
0.815
0.810
0.820
0.825
0.785
-40 135
VL = V+ = V
IN_HIGH
= 5.5V
BYPASS VOLTAGE
vs. TEMPERATURE
MAX5099 toc21
TEMPERATURE (°C)
BYPASS VOLTAGE (V)
10065-5 30
1.994
1.996
1.998
2.000
2.002
2.006
2.004
2.008
2.010
1.990
1.992
-40 135
VL = V+ = V
IN_HIGH
= 5.5V
EXTERNAL SYNCHRONIZATION
(FSEL_1 = SGND )
MAX5099 toc18
200ns/div
SOURCE2
10V/div
SOURCE1
10V/div
0V
SYNC
5V/div
0V
0V
OVP BEHAVIOR
MAX5099 toc19
1ms/div
PGOOD2
10V/div
VOUT1
10V/div
VOUT2
10V/div
GATE
10V/div
0V
0V
0V
V+
10V/div
0V
0V
EXTERNAL OVERVOLTAGE REMOVED
OUT-OF-PHASE OPERATION
(FSEL_1 = SGND)
MAX5099 toc16
200ns/div
SOURCE2
10V/div
DL1
10V/div
DL2
10V/div
SOURCE1
10V/div
0V
0V
0V
0V
EXTERNAL SYNCHRONIZATION
(FSEL_1 = V
L
)
MAX5099 toc17
200ns/div
SOURCE2
10V/div
SOURCE1
10V/div
0V
SYNC
5V/div
0V
0V
MAX5099
Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means that N1 is shorted externally.)
2.000
1.998
1.996
1.994
BYPASS VOLTAGE (V)
1.992
1.990
BYPASS VOLTAGE
vs. BYPASS CURRENT
TA = +85°C
TA = -40°C
0100705010 30 90
V+ SWITCHING SUPPLY CURRENT
vs. SWITCHING FREQUENCY
100
V+ = IN_HIGH = ON/OFF
80
60
40
TA = +125°C
TA = +25°C
BYPASS CURRENT (μA)
TA = +135°C
TA = +25°C
TA = +135°C
806020 40
MAX5099 toc22
MAX5099 toc24
SOURCE1, I
SOURCE1
200ns/div
V+ STANDBY SUPPLY CURRENT
vs. TEMPERATURE
4
V+ = IN_HIGH = ON/OFF
EN1 = EN2 = SGND
3
fSW = 1.85MHz
2
, DL1, I
IDL1
MAX5099 toc23
SOURCE1
10V/div
0V
DL1
10V/div
OV
I
SOURCE1
1A/div
0A
MAX5099 toc25
20
V+ SWITCHING SUPPLY CURRENT (mA)
0
300 2200
TA = -40°C
SWITCHING FREQUENCY (kHz)
IN_HIGH SHUTDOWN CURRENT
vs. TEMPERATURE
20
ON/OFF = SGND
16
IN_HIGH = 14V
12
IN_HIGH = 8V
8
4
IN_HIGH SHUTDOWN CURRENT (μA)
0
-50 150
TEMPERATURE (°C)
IN_HIGH = 16V
182014401060680
MAX5099 toc26
100500
1
V+ STANDBY SUPPLY CURRENT (mA)
0
-50 150
fSW = 300kHz
TEMPERATURE (°C)
IN_HIGH STANDBY CURRENT
vs. TEMPERATURE
ON/OFF = IN_HIGH
145
EN1 = EN2 = SGND
135
125
115
105
IN_HIGH = 8V
95
IN_HIGH STANDBY CURRENT (μA)
85
75
-50 150
IN_HIGH = 16V
IN_HIGH = 14V
TEMPERATURE (°C)
100500
100500
MAX5099 toc27
Loading...