Dual, 4A/2A, 4MHz, Step-Down DC-DC

Regulator with Tracking/Sequencing Capability

MAX15021

2

Maxim Integrated

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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.

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-

AVIN, PVIN_, DVDD_, EN_, FB_, RT,

SEL to SGND .........................................................-0.3V to +6V

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

28-Pin TQFN (derate 34.5mW/°C above +70°C) .....2758.6mW

Junction-to-Case Thermal Resistance (

Junction-to-Ambient Thermal Resistance (

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SYSTEM SPECIFICATIONS

Input-Voltage Range

2.5

5.5

V

Undervoltage Lockout Threshold

AVIN rising

2.1

2.2

2.3

V

Undervoltage Lockout Hysteresis

0.12

V

Operating Supply Current

3.5

6

mA

Shutdown Supply Current

20

65

µA

PWM DIGITAL SOFT-START/SOFT-STOP

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

0.3

V

Error-Amplifier Open-Loop Gain

80

dB

Error-Amplifier Unity-Gain Bandwidth

12

MHz

POWER MOSFETs

50

90

m

Ω

30

50

m

Ω

Regulator 1 Gate Charge

8

nC

Maximum LX1 RMS Current

4A

100

180

m

Ω

60

100

m

Ω

Regulator 2 Gate Charge

4

nC

Maximum LX2 RMS Current

2A