Operating Temperature Range. ......................... -40NC to +85NC
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 +85NC, 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
25
5
5
3.3
3.3
MIN
3.5
TYP
MAX
36
42
36
20
40
30
40
5.05
5.075
3.366
3.4
10
V
V
V
µA
V
UNIT
SYNCHRONOUS STEP-DOWN DC-DC CONVERTERS
www.maximintegrated.com
Maxim Integrated
│
3
MAX17230/MAX17231
2V–36V, Synchronous Dual Buck Controller with
Integrated Boost and 20µA Quiescent Current
Electrical Characteristics (continued)
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
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8μF, T
A
= T
J
= -40NC to +85NC, unless otherwise noted.) (Note 3)
CONDITIONS
FB rising
FB falling (Note 4)
T
A
= +25°C
V
IN
= 3.5V to 36V, V
FB
= 1V
V
FB
= 1V, V
BIAS
= 5V (Note 5)
MAX17231, DL_ low to DH_ high
Dead Time
MAX17231, DH_ low to DL_ high
MAX17230, DL_ low to DH_ high
MAX17230, DH_ low to DL_ high
Maximum Duty-Cycle
Minimum On-Time
PWM Switching Frequency
Range
t
ON(MIN)
Buck 1, buck 2
Buck 1, buck 2
Programmable, high frequency, MAX17231
Programmable, low frequency,
MAX17230
f
SW
MAX17231, R
FOSC
= 13.7kΩ,
V
BIAS
= 5V
MAX17230, R
FOSC
= 80.6kΩ,
V
BIAS
= 5V
Spread spectrum enabled
Minimum sync pulse of 100ns, MAX17231
Minimum sync pulse of 100ns, MAX17230
High threshold
Low threshold
V
LIMIT1,2
V
CS
- V
OUT,
V
BIAS
= 5V, V
OUT
≥ 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
= +25°C
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
0.2
1.98
360
2.2
400
±6
2.4
1200
50
2.2
MHz
1
2.42
440
MHz
kHz
%
MHz
kHz
V
mV
mV
ms
°
µA
Ω
Ω
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
%
µA
%/V
µS
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
www.maximintegrated.com
Maxim Integrated
│
4
MAX17230/MAX17231
2V–36V, Synchronous Dual Buck Controller with
Integrated Boost 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
P
GOOD_H
P
GOOD_F
SYMBOL
(V
IN
= 14V, V
BIAS
= 5V, C
BIAS
= 6.8μF, T
A
= T
J
= -40NC to +85NC, unless otherwise noted.) (Note 3)
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