Operating Temperature Range. ....................... -40NC to +125NC
Junction Temperature Range..........................................+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 2)
TQFN
Junction-to-Ambient Thermal Resistance (q
JA
) ..........27°C/W
Junction-to-Case Thermal Resistance (q
JC
) .................1°C/W
QFND
Junction-to-Ambient Thermal Resistance (q
JA
) ..........34°C/W
Junction-to-Case Thermal Resistance (q
JC
) ..............3.9°C/W
Note 1:
Self-protected against transient voltages exceeding these limits for
≤
50ns under normal operation and loads up to the
maximum rated output current.
Note 2:
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
PARAMETER
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted.) (Note 3)
SYMBOL
CONDITIONS
Normal operation
Supply Voltage Range
V
IN
t < 1s
With preboost after initial startup condition
is satisfied
V
EN1
= V
EN2
= V
EN3
= 0V
V
EN1
= 5V, V
OUT1
= 5V, V
EN2
= V
EN3
=
0V, V
EXTVCC
= 5V, no switching
Supply Current
I
IN
V
EN2
= 5V, V
OUT2
= 3.3V, V
EN1
= V
EN3
=
0V, V
EXTVCC
= 3.3V, no switching
V
EN1
= V
EN2
= 5V, V
OUT1
= 5V, V
OUT2
=
3.3V, V
EN3
= 0V, V
EXTVCC
= 3.3V,
no switching
Buck 1 Fixed Output Voltage
Buck 2 Fixed Output Voltage
Output Voltage Adjustable
Range
V
OUT1
V
OUT2
V
FB1
= V
BIAS
, PWM mode
V
FB1
= V
BIAS
, skip mode
V
FB2
= V
BIAS
, PWM mode
V
FB2
= V
BIAS
, skip mode
Buck 1, buck 2
4.95
4.95
3.234
3.234
1
2.0
8
30
20
MIN
3.5
TYP
MAX
36
42
36
20
40
30
FA
V
UNIT
SYNCHRONOUS STEP-DOWN DC-DC CONVERTERS
25
5
5
3.3
3.3
40
5.05
5.075
3.366
3.4
10
V
V
V
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Maxim Integrated
│
2
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
Electrical Characteristics (continued)
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted.) (Note 3)
PARAMETER
Regulated Feedback Voltage
Output Overvoltage Threshold
Feedback Leakage Current
Feedback Line Regulation Error
Transconductance
(from FB_ to COMP_)
g
m
I
FB1,2
SYMBOL
V
FB1,2
FB rising
FB falling (Note 4)
T
A
= +25NC
V
IN
= 3.5V to 36V, V
FB
= 1V
V
FB
= 1V, V
BIAS
= 5V (Note 5)
MAX16930, DL_ low to DH_ high
Dead Time
MAX16930, DH_ low to DL_ high
MAX16931, DL_ low to DH_ high
MAX16931, DH_ low to DL_ high
Maximum Duty-Cycle
Minimum On-Time
PWM Switching Frequency
Range
Buck 2 Switching Frequency
t
ON(MIN)
Buck 1, buck 2
Buck 1, buck 2
Programmable, high frequency,
MAX16930
Programmable, low frequency,
MAX16931
MAX16930ATLT/V+,
MAX16930BATLU/V+ only
f
SW
MAX16930, R
FOSC
= 13.7kI,
V
BIAS
= 5V
MAX16931, R
FOSC
= 80.6kI,
V
BIAS
= 5V
Spread spectrum enabled
Minimum sync pulse of 100ns, MAX16930
Minimum sync pulse of 100ns, MAX16931
High threshold
Low threshold
V
LIMIT1,2
V
CS
- V
OUT,
V
BIAS
= 5V, V
OUT
R
2.5V
Current sense = 80mV
Buck 1 and buck 2, fixed soft-start time
regardless of frequency
2
64
80
15
6
180
V
IN
= 6V, V
LX_
= V
IN
, T
A
= +25NC
V
BIAS
= 5V, I
DH_
= -100mA
V
BIAS
= 5V, I
DH_
= +100mA
0.01
10
2
1
20
4
10
1.2
240
1.5
0.6
96
1.98
360
1
0.2
1/2f
SW
2.2
400
±6
2.4
1200
2.42
440
50
2.2
MHz
1
MHz
MHz
kHz
%
MHz
kHz
V
mV
mV
ms
°
FA
I
I
CONDITIONS
MIN
0.99
+10
+5
TYP
1.0
+15
+10
0.01
0.00
1200
35
60
60
100
95
%
ns
ns
2400
MAX
1.01
+20
+15
1
UNIT
V
%
FA
%/V
FS
Switching Frequency Accuracy
Spread-Spectrum Range
FSYNC INPUT
FSYNC Frequency Range
FSYNC Switching Thresholds
CS Current-Limit Voltage
Threshold
Skip Mode Threshold
Soft-Start Ramp Time
Phase Shift Between Buck1 and
Buck 2
LX1, LX2 Leakage Current
DH1, DH2 Pullup Resistance
DH1, DH2 Pulldown Resistance
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Maxim Integrated
│
3
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
Electrical Characteristics (continued)
PARAMETER
DL1, DL2 Pullup Resistance
DL1, DL2 Pulldown Resistance
PGOOD1, PGOOD2 Threshold
PGOOD1, PGOOD2 Leakage
Current
PGOOD1, PGOOD2 Startup
Delay Time
PGOOD1, PGOOD2 Debounce
Time
INTERNAL LDO: BIAS
Internal BIAS Voltage
BIAS UVLO Threshold
Hysteresis
External V
CC
Threshold
THERMAL OVERLOAD
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
EN LOGIC INPUT
High Threshold
Low Threshold
Input Current
PREBOOST
Minimum On Time
Minimum Off Time
Switching Frequency
Current Limit
TON
BST
TOFF
BST
f
BOOST
I
LIMBST
V
INS,UV
V
TH,EXTVCC
P
GOOD_H
P
GOOD_F
SYMBOL
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted.) (Note 3)
CONDITIONS
V
BIAS
= 5V, I
DL_
= -100mA
V
BIAS
= 5V, I
DL_
= +100mA
% of V
OUT_
, rising
% of V
OUT_
, falling
V
PGOOD1,2
= 5V, T
A
= +25NC
Buck 1 and buck 2 after soft-start
is complete
Fault detection
8
85
80
MIN
TYP
4
1.5
90
85
0.01
64
20
40
MAX
8
3
95
90
1
UNIT
I
I
%
FA
Cycles
Fs
V
IN
> 6V
V
BIAS
rising
V
BIAS
falling
EXTVCC rising, HYST = 110mV
4.75
2.7
5
3.1
2.9
0.2
3
5.25
3.4
V
V
V
3.2
V
(Note 5)
(Note 5)
1.8
170
20
NC
NC
V
0.8
V
FA
ns
ns
2.42
0.48
132
MHz
mV
EN1, EN2 logic inputs only, T
A
= +25NC
0.01
60
60
1
V
FSELBST
= 0V, R
FOSC
= 13.7kI
V
FSELBST
= V
BIAS
, R
FOSC
= 13.7kI
CS3P - CS3N
One-time latch during startup; preboost
is disabled until the V
INS
rises above
this threshold (MAX16930ATLV/V+,
MAX16930BATLW/V+ (Note 6))
1.98
0.4
108
2.2
0.44
120
INS Unlock Threshold
1
1.05
1.1
V
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Maxim Integrated
│
4
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
Electrical Characteristics (continued)
PARAMETER
SYMBOL
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8µF, T
A
= T
J
= -40NC to +125NC, unless otherwise noted.) (Note 3)
CONDITIONS
Battery rising and EN3 high, preboost
turns off if V
INS
is above this threshold
(MAX16930ATLV/V+, MAX16930BATLW/
V+ (Note 6))
Battery falling and EN3 high, preboost
turns back on when V
INS
falls below
this threshold (MAX16930ATLV/V+,
MAX16930BATLW/V+ (Note 6))
Battery rising and EN3 high
(MAX16930ATLV/V+, MAX16930BATLW/
V+ (Note 6))
V
INS,UV
Battery falling and EN3 high, preboost
turns off when V
INS
falls below this
threshold (MAX16930ATLV/V+,
MAX16930BATLW/V+ (Note 6))
V
BSTON
= 5V, T
A
= +25NC
Fault detection
V
BIAS
= 5V, I
DL3
= -100mA
V
BIAS
= 5V, I
DL3
= +100mA
V
FB3
No load on boost output
0mV < V
CS3P
- V
CS3N
< 120mV,
error proportional to input current
High threshold
Low threshold
V
EN3
= 5.5V
I
TERM
= 10mA
V
TERM
= 14V, V
EN3
= 0V, T
A
= +25NC
T
A
= +25NC
7
70
0.01
0.01
3.5
2
14
150
1
1
1.1875
MIN
TYP
MAX
UNIT
INS Off Threshold
V
INS,OFF
1.2
1.25
1.3
V
INS On Threshold
V
INS,ON,SW
1.1
1.15
1.2
0.325
0.35
0.375
V
INS Threshold
Undervoltage Lockout
0.275
0.3
0.325
BSTON Leakage Current
BSTON Debounce Time
DL3 Pullup Resistance
DL3 Pulldown resistance
Feedback Voltage
Boost Load Regulation Error
EN3 Threshold
EN3 Input Current
TERM Resistance
TERM Leakage Current
INS and FB3 Leakage Current
0.01
10
4
1
1.25
0.7
1
8
2
1.3125
FA
Fs
I
I
V
%/A
V
FA
I
FA
FA
Note 3:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range and relevant supply volt-
age are guaranteed by design and characterization. Typical values are at T
A
= +25°C.
Note 4:
Overvoltage protection is detected at the FB1/FB2 pins. If the feedback voltage reaches overvoltage threshold of FB1/FB2
+ 15% (typ), the corresponding controllers stop switching. The controllers resume switching once the output drops below
FB1/FB2 + 10% (typ).
Note 5:
Guaranteed by design; not production tested.
Note 6:
INS pin functionality is disabled for the MAX16930ATLV/V+, MAX16930BATLW/V+. EN3 directly controls the turn-on and
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