Rainbow Electronics MAX5098A User Manual
General Description
The MAX5098A is a dual-output, high-switching-frequency DC-DC converter with integrated n-channel switches
that can be used either in high-side or low-side configuration. Each output can be configured either as a buck converter or a boost converter. In the buck configuration, this
device delivers up to 2A from converter 1 and 1A from
converter 2. The MAX5098A also integrates a 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 chargepump 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 converters operate over a wide operating
voltage range from 4.5V to 19V. The MAX5098A 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 (up to 2.2MHz)
also allows this device to operate outside the AM band
for automotive applications.
This device utilizes voltage-mode control for stable operation and external compensation, thus the loop gain is
tailored to optimize component selection and transient
response. This device can be synchronized to an external clock fed at the SYNC input. Also, a clock output
(CKO) allows a master-slave connection of two devices
with a four-phase synchronized switching sequence.
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 a shutdown input (ON/OFF).
Other features of the MAX5098A include overvoltage protection, short-circuit (hiccup current limit) and thermal
protection. The MAX5098A is available in a thermally
enhanced, exposed pad, 5mm x 5mm, 32-pin TQFN
package and is fully specified over the automotive
-40°C to +125°C temperature range.
Applications
Automotive AM/FM Radio Power Supply
Automotive Instrument Cluster Display
Features
o Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage
Range (with Up to 80V Load-Dump Protection)
o Dual-Output DC-DC Converter with Integrated
Power MOSFETs
o Each Output Configurable in Buck or Boost Mode
o Adjustable Outputs from 0.8V to 0.85V
IN
Buck
Configuration) and from VINto 28V (Boost
Configuration)
o I
OUT1
and I
OUT2
of 2A and 1A (Respectively) in
Buck Configuration
o Switching Frequency Programmable from 200kHz
to 2.2MHz
o Synchronization Input (SYNC)
o Clock Output (CKO) for Four-Phase Master-Slave
Operation
o Individual Converter Enable Input and Power-
Good Output
o Low-IQ(7µA) Standby Current (ON/OFF)
o Internal Digital Soft-Start and Soft-Stop
o Short-Circuit Protection on Outputs and
Maximum Duty-Cycle Limit
o Overvoltage Protection on Outputs with Auto
Restart
o Thermal Shutdown
o Thermally Enhanced 32-Pin TQFN Package
Dissipates up to 2.7W at +70°C
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4111; 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
MAX5098AATJ+
-40°C to +125°C 32 TQFN-EP*
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
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
SOURCE_ to PGND_.................................................-1V for 50ns
EN_ to SGND............................................................-0.3V to +6V
OSC, FSEL_1, COMP_, SYNC,
FB_ to SGND..............................................-0.3V to (V
L
+ 0.3V)
CKO to SGND..........................................-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
SYSTEM SPECIFICATIONS
Input Voltage Range V+
V+ Operating Supply Current I
V+ Standby Supply Current I
Efficiency η
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V+ = IN_HIGH 5.2 19
V
= V+ = IN_HIGH (Note 3) 4.5 5.5
L
Q
V+STBY
IN_HIGH
I
IN_HIGHSTBY
V
OV
VL unloaded, no switching 4.2 mA
V
= 0V, PGOOD_ unconnected, V+ =
EN_
V
IN_HIGH
(V
OUT1
V
OUT2
= 1.85MHz
f
SW
= 10mA 19 20 21 V
SINK
1mA < I
V
= V
EN_
V
IN_HIGH
V
ON/OFF
unconnected, V
to +85°C
VOV = V+ - V
(sinking)
= 14V
= 5V at 1.5A,
= 3.3V at 0.75A,
< 50mA 160 mV
SINK
= V
PGOOD_
= V
= 0V , P GOOD _ = V + =
ON/OFF
IN_HIGH
IN_HIGH
GATE
= 14V
= 14V , TA = -40°C
, I
GATE
V+ = VL = 5.2V 78
V+ = 12V 76
V+ = 16V 70
= 0V,
= 0mA
1.2 1.85 2.5 V
0.75 1.1 mA
270 600 µA
79µA
V
%
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
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
IN_HIGH
UVLO
GATE_CH
Rising, ON/OFF = IN_HIGH, GATE rising 3.6 4.1
Falling, ON/OFF = IN_HIGH, GATE falling 3.45
V
IN_HIGH
V
GATE
V+ = V
I
GATE Output Voltage
GATE Turn-Off Pulldown
Current
V
GATE
V
IN_HIGH
I
GATE_PD
GATE
-
V+ = V
I
GATE
V
IN_HIGH
V
GATE
STARTUP/VL REGULATOR
VL Undervoltage Lockout Trip
Level
UVLO V
falling 3.9 4.1 4.3 V
L
VL Undervoltage Lockout
Hysteresis
VL Output Voltage V
VL LDO Short-Circuit Current I
VL_SHORT
VL LDO Dropout Voltage V
L
LDO
I
SOURCE_
V+ = V
I
SOURCE_
BYPASS OUTPUT
BYPASS Voltage V
BYPASS Load Regulation ΔV
BYPASS
BYPASS
I
BYPASS
0 < I
BYPASS
SOFT-START/SOFT-STOP
Digital Ramp Period SoftStart/Soft-Stop
Internal 6-bit DAC 2048
Soft-Start/Soft-Stop
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
INTERNAL MOSFETS
I
SWITCH
V
On-Resistance High-Side
MOSFET Converter 1
R
ON1
SOURCE1
I
SWITCH
V
SOURCE1
= V
ON/OFF
= 14V,
= V+ = 0V
= V
IN_HIGH
ON/OFF
= 1µA, sourcing
= V
IN_HIGH
ON/OFF
= 1µA, sourcing
= 14V, V
ON/OFF
= 5V, sinking
= 4.5V,
= 14V,
= 0V, V+ = 0V,
20 45 80 µA
4.0 5.3 7.5
9
3.6 mA
180 mV
= 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
= 0µA 1.98 2.00 2.02 V
< 100µA (sourcing) 2 5 mV
64 Steps
250 nA
1.4 2.4 3.4 mS
= 100mA, BST1/VDD1 to
= 5.2V
= 100mA, BST1/VDD1 to
= 4.5V
195
208 355
V
V
f
SW
Clock
Cycles
V
mΩ
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
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)
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
SWITCH
V
R
ON2
I
OUT1
I
OUT2
I
LK12
SOURCE2
I
SWITCH
V
SOURCE2
V
OUT1
V
OUT2
V
= V
EN1
V
SOURCE_
= 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
EN2
= 0V
= 0V, V
DRAIN_
= 19V,
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
SYNC
SYNCH
SYNCL
SYNC_LEAK
t
SYNCIN
Clock Output Phase Delay CKO
SYNC to Source 1 Phase Delay SYNC
Clock Output High Level V
Clock Output Low Level V
I
CL1
I
CL2
MAX
SW
SW
PHASE
PHASEROSC
CKOH
CKOL
= 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 2.1 2.6 A
SYNC = SGND, fSW = 1.25MHz 82 90 95 %
200 2200 kHz
R
= 6.81kΩ, each converter
OSC
(FSEL_1 = V
5.6kΩ < R
10kΩ < R
OSC
OSC
)
L
< 10kΩ, 1% 5
< 62.5kΩ, 1% 7
1.7 1.9 2.1 MHz
SYNC input frequency is twice the
individual converter frequency,
FSEL_1 = V
(see the Setting the
L
400 4400 kHz
Switching Frequency section)
2V
0.8 V
2µA
100 ns
R
= 62.5kΩ, with respect to converter
OSC
2/SOURCE2 waveform
40 D eg r ees
= 62.5kΩ 90 D eg r ees
VL = 5.2V, sourcing 5mA 3.6 V
VL = 5.2V, sinking 5mA 0.6 V
%
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
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.
FSEL_1
FSEL_1 Input High Threshold V
FSEL_1 Input Low Threshold V
FSEL_1 Input Leakage I
ON/OFF
ON/OFF Input High Threshold V
ON/OFF Input Low Threshold V
ON/OFF Input Leakage Current I
EN_ INPUTS
EN_ Input High Threshold V
EN_ Input Hysteresis V
EN_ Input Leakage Current I
POWER-GOOD OUTPUT (PGOOD1, PGOOD2)
PGOOD_ Threshold V
PGOOD_ Output Voltage V
PGOOD_ Output Leakage
Current
OUTPUT OVERVOLTAGE PROTECTION
FB_ OVP Threshold Rising V
FB_ OVP Threshold Falling V
THERMAL PROTECTION
Thermal Shutdown T
Thermal Hysteresis T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IH
IL
FSEL_1_LEAK
IH
IL
ON/OFF_LEAKVON/OFF
IH
EN_HYS
EN_LEAK
TPGOOD_
PGOOD_ISINK
I
LKPGOOD_
OVP_R
OVP_F
SHDN
HYST
EN_ rising 1.9 2.0 2.1 V
Falling 90 92.5 95 % V
= 3mA 0.4 V
V+ = VL = V
V
PGOOD_
Rising +165 °C
= 5V 0.26 2.00 µA
= V
IN_HIGH
= 23V, V
FB_
= 1V
= 5.2V,
EN_
2V
2V
-1 +1 µA
107 114 121 % V
0.5 V
12.5 V
20 °C
0.8 V
2µA
0.8 V
2µA
FB_
FB_
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
6 _______________________________________________________________________________________
Typical Operating Characteristics
(See the
Typical Application Circuit
, unless otherwise noted. V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means
that N1 is shorted externally.)
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5098A toc01
LOAD (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
MAX5098A toc02
LOAD (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
= 1.85MHz
OUTPUT1 EFFICIENCY
vs. LOAD CURRENT
MAX5098A toc03
LOAD (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
MAX5098A toc04
LOAD (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
MAX5098A toc05
LOAD (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
MAX5098A toc06
LOAD (A)
OUTPUT2 VOLTAGE (V)
0.90.80.70.60.50.40.3
3.22
3.24
3.26
3.28
3.30
3.20
0.2 1.0
VIN = 5.5V
VIN = 16V
VIN = 14V
V
OUT
= 3.3V
f
SW
= 1.85MHz
VL OUTPUT VOLTAGE
vs. CONVERTER SWITCHING FREQUENCY
MAX5098A toc07
CONVERTER SWITCHING FREQUENCY (kHz)
V
L
OUTPUT VOLTAGE (V)
17001200700
4.2
4.4
4.6
4.8
5.0
5.2
5.4
4.0
200 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
MAX5098A 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
MAX5098A 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
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(See the
Typical Application Circuit
, unless otherwise noted. V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means
that N1 is shorted externally.)
LINE-TRANSIENT RESPONSE
(BUCK CONVERTER)
1ms/div
CONVERTER 2
LOAD-TRANSIENT RESPONSE
MAX5098A toc10
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
MAX5098A toc12
V
= 3.3V
OUT2
AC-COUPLED
200mV/div
I
OUT2
500mA/div
0A
CONVERTER 1
LOAD-TRANSIENT RESPONSE
100μs/div
SOFT-START/SOFT-STOP FROM EN1
MAX5098A toc11
MAX5098A 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
100μs/div
1ms/div
OUT-OF-PHASE OPERATION
SOFT-START FROM ON/OFF
0V
0V
0V
0V
2ms/div
MAX5098A toc14
ON/OFF
5V/div
= EN1 = EN2
V
L
5V/div
GATE
10V/div
V+
10V/div
= 5V/2A
V
OUT1
5V/div
(FSEL_1 = V
200ns/div
)
L
MAX5098A toc15
CKO
5V/div
0V
SOURCE1
10V/div
0V
SOURCE2
10V/div
0V
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(See the
Typical Application Circuit
, unless otherwise noted. V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means
that N1 is shorted externally.)
OUT-OF-PHASE OPERATION
(FSEL_1 = SGND)
EXTERNAL SYNCHRONIZATION
(FSEL_1 = SGND )
200ns/div
MAX5098A toc16
MAX5098A toc18
CKO
5V/div
0V
SOURCE1
10V/div
0V
SOURCE2
10V/div
0V
SYNC
5V/div
0V
CKO
5V/div
0V
SOURCE1
10V/div
0V
SOURCE2
10V/div
0V
EXTERNAL SYNCHRONIZATION
(FSEL_1 = V
FOUR-PHASE OPERATION
(FSEL_1 = V
0V
0V
0V
0V
0V
200ns/div
)
L
MAX5098A toc17
)
L
MAX5098A toc19
SYNC
5V/div
0V
CKO
5V/div
0V
SOURCE1
10V/div
0V
SOURCE2
10V/div
0V
MASTER
CKO
5V/div
MASTER SOURCE1
20V/div
MASTER SOURCE2
20V/div
SLAVE SOURCE1
20V/div
SLAVE SOURCE2
20V/div
200ns/div
200ns/div
FB_ VOLTAGE
VL = V+ = V
vs. TEMPERATURE
= 5.5V
IN_HIGH
TEMPERATURE (°C)
10065-5 30
OVP BEHAVIOR
0V
EXTERNAL OVERVOLTAGE REMOVED
0V
0V
0V
0V
1ms/div
MAX5098A toc20
V+
10V/div
GATE
10V/div
V
OUT2
10V/div
V
OUT1
10V/div
PGOOD2
10V/div
0.825
0.820
0.815
0.810
0.805
0.800
FB_ VOLTAGE (V)
0.795
0.790
0.785
-40 135
MAX5098A toc21
MAX5098A
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(See the
Typical Application Circuit
, unless otherwise noted. V+ = V
IN_HIGH
= 14V, unless otherwise noted. V+ = V
IN_HIGH
means
that N1 is shorted externally.)
V+ SWITCHING SUPPLY CURRENT
vs. SWITCHING FREQUENCY
MAX5098A toc25
SWITCHING FREQUENCY (kHz)
V+ SWITCHING SUPPLY CURRENT (mA)
182014401060680
10
20
30
40
50
0
300 2200
TA = +25°C
TA = +135°C
TA = +125°C
TA = +85°C
TA = -40°C
V+ = IN_HIGH = ON/OFF
V+ STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX5098A toc26
TEMPERATURE (°C)
V+ STANDBY SUPPLY CURRENT (mA)
100500
1
2
3
4
0
-50 150
fSW = 1.85MHz
fSW = 300kHz
V+ = IN_HIGH = ON/OFF
EN1 = EN2 = SGND
IN_HIGH SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5098A toc27
TEMPERATURE (°C)
IN_HIGH SHUTDOWN CURRENT (μA)
100500
4
8
12
16
20
0
-50 150
IN_HIGH = 8V
IN_HIGH = 14V
IN_HIGH = 16V
ON/OFF = SGND
IN_HIGH STANDBY CURRENT
vs. TEMPERATURE
MAX5098A toc28
TEMPERATURE (°C)
IN_HIGH STANDBY CURRENT (μA)
100500
85
95
105
115
125
135
145
75
-50 150
IN_HIGH = 8V
IN_HIGH = 14V
IN_HIGH = 16V
ON/OFF = IN_HIGH
EN1 = EN2 = SGND
BYPASS VOLTAGE
vs. TEMPERATURE
2.010
VL = V+ = V
2.008
2.006
2.004
2.002
2.000
1.998
BYPASS VOLTAGE (V)
1.996
1.994
1.992
1.990
-40 135
= 5.5V
IN_HIGH
TEMPERATURE (°C)
BYPASS VOLTAGE
2.000
1.998
MAX5098A toc22
1.996
1.994
BYPASS VOLTAGE (V)
1.992
10065-5 30
1.990
vs. BYPASS CURRENT
TA = +85°C
TA = -40°C
0 100705010 30 90
BYPASS CURRENT (μA)
TA = +125°C
SOURCE1, SOURCE1 INDICATOR CURRENT,
SOURCE2, SOURCE2 INDICATOR CURRENT
TA = +135°C
TA = +25°C
806020 40
MAX5098A toc23
0V
0A
0V
0A
1μs/div
MAX5098A toc24
SOURCE1
20V/div
NO LOAD
I
500mA/div
NO LOAD
SOURCE2
20V/div
I
1A/div
SOURCE1
SOURCE2
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