MAX15021 Datasheet, PDF (2/24 Pages) Maxim Integrated Products – Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability

MAX15021
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
ABSOLUTE MAXIMUM RATINGS
AVIN, PVIN_, DVDD_, EN_, FB_, RT,
SEL to SGND .........................................................-0.3V to +6V
COMP_ to SGND .....................................-0.3V to (V_AVIN + 0.3V)
PGND_ to SGND ...................................................-0.3V to +0.3V
LX_ Current (Note 1)
Regulator 1...............................................................................6A
Regulator 2...............................................................................3A
Current into Any Pin other than PVIN_,
LX_, and PGND_ ..............................................................50mA
Continuous Power Dissipation (T_A = +70°C)
28-Pin TQFN (derate 34.5mW/°C above +70°C) .....2758.6mW
Junction-to-Case Thermal Resistance (θ_JC)(Note 2) .........2°C/W
Junction-to-Ambient Thermal Resistance (θ_JA)(Note 2) ..29°C/W
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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
Input-Voltage Range
Undervoltage Lockout Threshold
V_AVIN = V_PVIN1 = V_PVIN2 = V_DVDD1 =
2.5
V_DVDD2
5.5
V
AVIN rising
2.1
2.2
2.3
V
Undervoltage Lockout Hysteresis
0.12
V
Operating Supply Current
Shutdown Supply Current
PWM DIGITAL SOFT-START/SOFT-STOP
V_{EN_}= 1.3V, V_{FB_} = 0.8V
V_{EN_} = 0V
3.5
6
mA
20
65
µA
Soft-Start/Soft-Stop Duration
4096
Clock
Cycles
Reference Voltage Steps
64
Steps
PWM ERROR AMPLIFIERS
FB1, FB2 Input Bias Current
-1
+1
µA
FB1, FB2 Voltage Set-Point
0.593 0.599 0.605
V
COMP1, COMP2 Voltage Range
Error-Amplifier Open-Loop Gain
I_COMP_ = -250µA to +250µA
0.3
V_AVIN - 0.5
V
80
dB
Error-Amplifier Unity-Gain Bandwidth
12
MHz
POWER MOSFETs
Regulator 1 p-Channel MOSFET R_DSON
Regulator 1 n-Channel MOSFET R_DSON
Regulator 1 Gate Charge
Maximum LX1 RMS Current
V_DVDD1 = 5V
V_DVDD1 = 5V
V_DVDD1 = 5V
50
90
mΩ
30
50
mΩ
8
nC
4
A
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
100 180
mΩ
60
100
mΩ
4
nC
2
A
2
Maxim Integrated