Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
LX_ has internal diodes to PGND_ and PVIN_. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation.
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 see
www.maximintegrated.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(V
AVIN
= V
PVIN_
= V
DVDD_
= 3.3V, V
PGND_
= V
SGND_
= 0V, R
T
= 25kΩ, and T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
SYSTEM SPECIFICATIONS
Input-Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Operating Supply Current
Shutdown Supply Current
PWM DIGITAL SOFT-START/SOFT-STOP
Soft-Start/Soft-Stop Duration
Reference Voltage Steps
PWM ERROR AMPLIFIERS
FB1, FB2 Input Bias Current
FB1, FB2 Voltage Set-Point
COMP1, COMP2 Voltage Range
Error-Amplifier Open-Loop Gain
Error-Amplifier Unity-Gain Bandwidth
POWER MOSFETs
Regulator 1 p-Channel MOSFET R
DSON
Regulator 1 n-Channel MOSFET R
DSON
Regulator 1 Gate Charge
Maximum LX1 RMS Current
Regulator 2 p-Channel MOSFET R
DSON
Regulator 2 n-Channel MOSFET R
DSON
Regulator 2 Gate Charge
Maximum LX2 RMS Current
V
DVDD2
= 5V
V
DVDD2
= 5V
V
DVDD2
= 5V
V
DVDD1
= 5V
V
DVDD1
= 5V
V
DVDD1
= 5V
50
30
8
4
100
60
4
2
180
100
90
50
mΩ
mΩ
nC
A
mΩ
mΩ
nC
A
I
COMP
_ = -250µA to +250µA
-1
0.593
0.3
80
12
0.599
+1
0.605
V
AVIN
- 0.5
µA
V
V
dB
MHz
4096
64
Clock
Cycles
Steps
V
EN_
= 1.3V, V
FB_
= 0.8V
V
EN_
= 0V
V
AVIN
= V
PVIN1
= V
PVIN2
= V
DVDD1
=
V
DVDD2
AVIN rising
2.5
2.1
2.2
0.12
3.5
20
6
65
5.5
2.3
V
V
V
mA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
Maxim Integrated
MAX15021
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
ELECTRICAL CHARACTERISTICS (continued)
(V
AVIN
= V
PVIN_
= V
DVDD_
= 3.3V, V
PGND_
= V
SGND_
= 0V, R
T
= 25kΩ, and T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
V
AVIN
= 3.3V
V
AVIN
= 2.5V
V
AVIN
= 3.3V
V
AVIN
= 2.5V
V
AVIN
= 3.3V
V
AVIN
= 2.5V
V
AVIN
= 3.3V
V
AVIN
= 2.5V
N
CL
N
CLR
N
HT
MIN
4.5
3.4
4.0
3.0
2.25
1.70
2.0
1.5
TYP
4.9
3.65
4.9
3.7
2.45
1.85
2.5
1.85
4
3
8192
MAX
5.3
3.95
5.65
4.25
2.65
1.98
2.83
2.13
UNITS
PWM CURRENT LIMIT AND HICCUP MODE
Regulator 1 Peak Current Limit
Regulator 1 Valley Current Limit
Regulator 2 Peak Current Limit
Regulator 2 Valley Current Limit
Number of Cumulative Current-Limit
Events to Hiccup
Number of Consecutive Noncurrent
Limit Cycles to Clear N
CL
Hiccup Timeout
ENABLE/SEL
EN_ Threshold
EN_ Hysteresis
EN_ Input Current
SEL High Threshold
SEL Low Threshold
SEL Input Bias Current
OSCILLATOR
Switching Frequency Range
Oscillator Accuracy
Phase Shift Between Regulators
RT Current
RT Voltage Range
Minimum Controllable On-Time
Minimum Controllable Off-Time
PWM Ramp Amplitude
PWM Ramp Valley
THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Temperature rising
+160
15
°C
°C
V
RT
0 < V
RT
< 1.067V
31.30
0.13
60
60
V
AVIN
/4
0.3
f
SW
f
SW
= 3MHz x [V
RT
(V)/1.067(V)]
(Note 4)
f
SW
≤
1500kHz
f
SW
> 1500kHz
500
-6
-10
180
32
32.58
1.067
4000
+6
+10
kHz
%
Degrees
µA
V
ns
ns
V
V
Present only during startup
-100
-2.5
0.85 x V
AVIN
0.2 x V
AVIN
+100
V
EN_
rising
1.207
1.225
0.12
+2.5
1.243
V
V
µA
V
V
µA
A
A
A
A
Clock
Cycles
Clock
Cycles
Clock
Cycles
Note 3:
Specifications are 100% production tested at T
A
= +25°C and T
A
= +125°C. Maximum and minimum specifications over
temperature are guaranteed by design.
Note 4:
When operating with V
AVIN
= 2.5V, the maximum switching frequency should be derated to 3MHz.
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