down current for wide input voltage range boost/SEPIC
converters. The 4.5V to 36V input operating volt-
age range makes these devices ideal in automotive
applications such as for front-end “preboost” or “SEPIC”
power supplies and for the first boost stage in high-
power LED lighting applications. An internal low-dropout
regulator (PVL regulator) with a 5V output voltage
enables the MAX16990/MAX16992 to operate directly
from an automotive battery input. The input operating
range can be extended to as low as 2.5V when the
converter output is applied to the SUP input.
There are multiple versions of the devices offering one
or more of the following functions: a synchronization
output (SYNCO) for two-phase operation, an overvoltage
protection function using a separate input pin (OVP), and
a reference input pin (REFIN) to allow on-the-fly output
voltage adjustment.
The MAX16990 and MAX16992 operate in different
frequency ranges. All versions can be synchronized to
an external master clock using the FSET/SYNC input.
In addition, the MAX16990/MAX16992 have a factory-
programmable spread-spectrum option. Both devices
are available in compact 12-pin TQFN and 10-pin
µMAX
®
packages.
Benefits and Features
●
Minimized Radio Interference with 2.5MHz Switching
Frequency Above the AM Radio Band
●
Space-Efficient Solution Design with Minimized
External Components
• 100kHz to 1MHz (MAX16990) and 1MHz to
2.5MHz (MAX16992) Switching-Frequency Ranges
• 12-Pin TQFN (3mm x 3mm) and 10-Pin
μMAX
Packages
●
Spread Spectrum Simplifies EMI Management Design
●
Flexibility with Available Configurations for Boost,
SEPIC, and Multiphase Applications
• Adjustable Slope Compensation
• Current-Mode Control
• Internal Soft-Start (9ms)
●
Protection Features Support Robust Automotive
Applications
• Operating Voltage Range Down to 4.5V (2.5V or
Lower in Bootstrapped Mode), Immune to
Load-Dump Transient Voltages Up to 42V
• PGOOD Output and Hiccup Mode for Enhanced
System Protection
• Overtemperature Shutdown
• -40°C to +125°C Operation
Typical Application Circuit
22µF
BOOTSTRAPPED 2.2MHz APPLICATION WITH LOW OPERATING VOLTAGE
Applications
●
Automotive LED Lighting
●
Automotive Audio/Navigation Systems
●
Dashboards
BATTERY INPUT
2.5V to 40V
1µF
PVL
SUP
0.47µH
47µF
CERAMIC
P
17kΩ
SW_OUT
8V/2A
Ordering Information
appears at end of data sheet.
10kΩ
PGOOD
PVL
2.2µF
DRV
1kΩ
ISNS
N
91kΩ
PGOOD
22mΩ
10kΩ
N
MAX16992AUBA /B
FB
FSET/SYNC
COMP
13kΩ
µMAX is a registered trademark of Maxim Integrated Products, Inc.
12kΩ
GND
EN
ENABLE
N
19-6632; Rev 7; 2/17
MAX16990/MAX16992
36V, 2.5MHz Automotive Boost/
SEPIC Controllers
Absolute Maximum Ratings
EN, SUP, OVP, FB to GND ....................................-0.3V to +42V
DRV, SYNCO, FSET/SYNC, COMP,
PGOOD, ISNS, REFIN to GND ............ -0.3V to (V
PVL
+ 0.3V)
PVL to GND ............................................................... -0.3V to 6V
Continuous Power Dissipation (T
A
= +70NC)
FMAX
on SLB (derate 10.3mW/NC above +70NC).......825mW
FMAX
on MLB (derate 12.9mW/NC above +70NC) ....1031mW
TQFN on SLB (derate 13.2mW/NC above +70NC) .....1053mW
TQFN on MLB (derate 14.7mW/NC above +70NC) ....1176mW
Operating Temperature Range ........................ -40NC to +125NC
Maximum Junction Temperature.....................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
Package Thermal Characteristics
(Note 1)
FMAX
(Single-Layer Board)
Junction-to-Ambient Thermal Resistance (B
JA
) ..........97NC/W
Junction-to-Case Thermal Resistance (B
JC
) .................5NC/W
FMAX
(Four-Layer Board)
Junction-to-Ambient Thermal Resistance (B
JA
) ..........78NC/W
Junction-to-Case Thermal Resistance (B
JC
) .....................5NC/W
TQFN (Single-Layer Board)
Junction-to-Ambient Thermal Resistance (B
JA
) ..........76NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...................11NC/W
TQFN (Four-Layer Board)
Junction-to-Ambient Thermal Resistance (B
JA
) ..........68NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............11NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
SUP
= 14V, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
=+25NC.) (Note 2)
PARAMETER
POWER SUPPLY
SUP Operating Supply Range
SUP Supply Current in Operation
SUP Supply Current in Shutdown
OVP Threshold Voltage
OVP Threshold Voltage
Hysteresis
OVP Input Current
PVL REGULATOR
PVL Output Voltage
PVL Undervoltage Lockout
PVL Undervoltage-Lockout
Hysteresis
V
PVL
V
UV
V
UVH
SUP rising
4.7
3.8
5
4
0.4
5.3
4.3
V
V
V
V
SUP
I
CC
I
SHDN
V
OVP
V
OVPH
I
OVP
-1
V
FB
= 1.1V, no
switching
V
EN
= 0V
OVP rising
105
MAX16990
MAX16992
4.5
0.75
1.25
4
110
2.5
+1
36
1.3
2
7
115
V
mA
FA
% of
V
FB
% of
V
FB
FA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
2
MAX16990/MAX16992
36V, 2.5MHz Automotive Boost/
SEPIC Controllers
Electrical Characteristics (continued)
(V
SUP
= 14V, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
=+25NC.) (Note 2)
PARAMETER
OSCILLATOR
Switching Frequency
Spread-Spectrum Spreading
Factor
Switching Frequency Range
FSET/SYNC Frequency Range
FSET Regulation Voltage
Soft-Start Time
Hiccup Period
Maximum Duty Cycle
Minimum On-Time
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
GATE DRIVERS
DRV Pullup Resistance
DRV Pulldown Resistance
DRV Output Peak Current
REGULATION/CURRENT SENSE
V
REFIN
= V
PVL
FB Regulation Voltage
FB Input Current
ISNS Threshold
ISNS Leading-Edge Blanking
Time
Current-Sense Gain
Peak Slope Compensation
Current-Ramp Magnitude
PGOOD Threshold
V
PG
t
BLANK
A
VI
Added to ISNS input
Percentage of final
value
Rising
Falling
40
85
80
MAX16990
MAX16992
V
FB
I
FB
V
REFIN
= 2V
V
REFIN
= 0.5V
Across full line, load,
and temperature
range
0.99
1.98
0.495
-0.5
212
250
60
40
8
50
90
85
60
95
90
1
2
0.5
1.01
2.02
0.505
+0.5
288
FA
mV
ns
V/V
FA
%
V
R
DRVH
R
DRVL
I
DRV
I
DRV
= 100mA
I
DRV
= -100mA
Sourcing, C
DRV
= 10nF
Sinking, C
DRV
= 10nF
3
1.4
0.75
1
5.5
2.5
I
I
A
T
S
T
H
Temperature rising
165
10
NC
NC
f
SW
SS
f
SWR
f
SYNC
V
FSET
t
SS
t
HICCUP
DC
MAX
t
ON
MAX16990, R
FSET
= 69kI
MAX16992, R
FSET
= 12kI
93
85
50
80
110
R
FSET
= 69kI
R
FSET
= 12kI
B, D, and F versions
When set with
resistor on pin
Using external
SYNC signal
12kI < R
FSET
< 69kI
Internally set
MAX16990
MAX16992
MAX16990
MAX16992
100
1000
220
1000
0.9
6
9
55
12
360
2000
400
2200
Q6
1000
2500
1000
2500
440
2400
kHz
% of
f
SW
kHz
kHz
V
ms
ms
%
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
3
MAX16990/MAX16992
36V, 2.5MHz Automotive Boost/
SEPIC Controllers
Electrical Characteristics (continued)
(V
SUP
= 14V, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
=+25NC.) (Note 2)
PARAMETER
ERROR AMPLIFIER
REFIN Input Voltage Range
REFIN Threshold for 1V FB
Regulation
Error-Amplifier g
m
Error-Amplifier Output
Impedance
COMP Output Current
COMP Clamp Voltage
LOGIC-LEVEL INPUTS/OUTPUTS
PGOOD/SYNCO Output Leakage
Current
PGOOD/SYNCO Output Low
Level
EN High Input Threshold
EN Low Input Threshold
FSET/SYNC High Input Threshold
FSET/SYNC Low Input Threshold
EN and REFIN Input Current
-1
Note 2:
All devices 100% production tested at T
A
= +25NC. Limits over temperature are guaranteed by design.
1 Introduction
In the mid-1960s, American scientist Maas conducted extensive experimental research on the charging process of open-cell batteries and proposed an acceptable charging curve for ...[详细]
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