Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
*As
per JEDEC 51 standard (multilayer board).
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (q
JA
) .......38.3°C/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
= V
SUPSW
= 14V, L1 = 4.7FH, V
EN
= 14V, C
IN
= 10FF, C
OUT
= 22FF, C
BIAS
= 1FF, C
BST
= 0.1FF, C
CRES
= 1nF, R
FOSC
=
12.1kI, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER
Supply Voltage
Supply Current
Shutdown Supply Current
BIAS Regulator Voltage
BIAS Undervoltage Lockout
BIAS Undervoltage Lockout
Hysteresis
Thermal-Shutdown Threshold
OUTPUT VOLTAGE (OUT)
Normal operation, V
FB
= V
BIAS
, I
LOAD
= 2A,
T
A
= +25°C
Normal operation, V
FB
= V
BIAS
, I
LOAD
= 2A,
-40°C < T
A
<+125°C
V
OUT
= 5V, V
FB
= V
BIAS
; 400mA < I
LOAD
< 2A
6V < V
SUP
< 28V
I
BST
I
LX
I
SKIP_TH
100% duty cycle, V
BST
- V
LX
= 5V
2.5
4.95
4.9
4.95
5
5
5.05
1
0.02
1.5
3
240
3
3.5
5.05
V
5.1
5.2
V
%
%/V
mA
A
mA
V
BIAS
V
UVBIAS
V
UVBIAS_
HYS
SYMBOL
V
SUP
I
SUP
CONDITIONS
Normal operation
Normal operation, I
LOAD
= 1.5A
Skip mode, no load, V
OUT
= 5V
V
EN
= 0V
V
SUP
= V
SUPSW
= 6V to 42V, V
OUT
> 6V
V
BIAS
rising
MIN
3.5
TYP
2
35
5
MAX
28
3
50
10
5.5
3.25
UNITS
V
mA
FA
FA
V
V
mV
NC
4.9
2.85
5.1
3.05
350
175
Output Voltage
V
OUT
Skip-Mode Output Voltage
Load Regulation
Line Regulation
BST Input Current
LX Current Limit
Skip-Mode Current Threshold
V
OUT_SKIP
No load, V
FB
= V
BIAS
(Note 2)
2
Maxim Integrated
MAX16974
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
ELECTRICAL CHARACTERISTICS (continued)
(V
SUP
= V
SUPSW
= 14V, L1 = 4.7FH, V
EN
= 14V, C
IN
= 10FF, C
OUT
= 22FF, C
BIAS
= 1FF, C
BST
= 0.1FF, C
CRES
= 1nF, R
FOSC
=
12.1kI, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
A
= +25NC.)
PARAMETER
Power-Switch On-Resistance
LX Leakage Current
SYMBOL
R
ON
I
LX,LEAK
CONDITIONS
R
ON
measured between SUPSW and LX,
I
LX
= 500mA
V
SUP
= 28V, V
LX
= 0V, T
A
= +25°C
V
SUP
= 28V, V
LX
= 0V, T
A
= +125°C
0.04
20
FB connected to an external resistive divider,
T
A
= +25°C
FB connected to an external resistive divider,
-40°C < T
A
< +125°C
6V < V
SUP
< 28V
V
FB
= 1V, V
BIAS
= 5V
0.99
0.985
1.0
1.0
0.02
1000
120
92
R
FOSC
= 120kI
R
FOSC
= 12.1kI
190
2.00
260
2.20
310
2.48
1.01
V
1.015
%/V
FS
ns
%
kHz
MHz
MIN
TYP
185
MAX
400
1
UNITS
mI
FA
TRANSCONDUCTANCE AMPLIFIER (COMP)
FB Input Current
I
FB
nA
FB Regulation Voltage
V
FB
FB Line Regulation
Transconductance (from FB to
COMP)
Minimum On-Time
Cold-Crank Event Duty Cycle
OSCILLATOR FREQUENCY
Oscillator Frequency
DV
LINE
g
m,EA
t
MIN,ON
DC
CC
EXTERNAL CLOCK INPUT (FSYNC)
External Input Clock Acquisition
Time
External Input Clock High
Threshold
FSYNC Pulldown Resistance
Soft-Start Time
ENABLE INPUT (EN)
Enable-On Threshold Voltage Low
Enable-On Threshold Voltage High
Enable Threshold Voltage
Hysteresis
Enable Input Current
RESET
Reset Internal Switching Level
RESETI Threshold Voltage
CRES Threshold Voltage
CRES Threshold Hysteresis
RESETI Input Current
V
TH_RISING
V
FB
rising, V
RESETI
= 0V
V
TH_FALLING
V
FB
falling, V
RESETI
= 0V
V
RESETI_LO
V
RESETI
falling
V
CRES_HI
V
CRES_HYS
I
RESET
V
RESETI
= 0V
V
CRES
rising
0.88
0.83
1.13
1.1
0.90
0.85
1.2
1.25
0.04
0.02
0.92
0.87
1.27
1.45
V
V
V
V
FA
V
EN_LO
V
EN_HI
V
EN,HYS
I
EN
2.2
0.35
0.5
0.7
V
V
V
FA
t
FSYNC
V
FSYNC_HI
V
FSYNC
rising
1.5
0.5
510
f
SW
= 220kHz
f
SW
= 2.2MHz
9.3
0.93
4
Cycles
V
V
kI
ms
External Input Clock Low Threshold V
FSYNC_LO
V
FSYNC
falling
I
FSYNC
t
SS
Maxim Integrated
3
MAX16974
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
ELECTRICAL CHARACTERISTICS (continued)
(V
SUP
= V
SUPSW
= 14V, L1 = 4.7FH, V
EN
= 14V, C
IN
= 10FF, C
OUT
= 22FF, C
BIAS
= 1FF, C
BST
= 0.1FF, C
CRES
= 1nF, R
FOSC
=
12.1kI, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical values are at T
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