Datasheet

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General Description

The MAX17019 is a high-input-voltage quad-output con-

troller (up to 38V). The MAX17019 provides a compact,

low-cost controller capable of providing four independent

regulators—a main stage, a 3A

P-P

internal stepdown, a

P-P

internal step-down, and a 2A source/sink linear

regulator. The input voltage is up to 38V.

The internal switching regulators include 5V synchronous

MOSFETs that can be powered directly from a single Li+

cell or from the main 3.3V/5V power stages. Finally, the

linear regulator is capable of sourcing and sinking 2A to

support DDR termination requirements or to generate a

fixed output voltage.

The step-down converters use a peak current-mode,

fixed-frequency control scheme—an easy to imple-

ment architecture that does not sacrifice fast-transient

response. This architecture also supports peak current-

limit protection and pulse-skipping operation to maintain

high efficiency under light-load conditions.

Separate enable inputs and independent open-drain

power-good outputs allow flexible power sequencing. A

soft-start function gradually ramps up the output voltage to

reduce the inrush current. Disabled regulators enter high-

impedance states to avoid negative output voltage created

by rapidly discharging the output through the low-side

MOSFET. The MAX17019 also includes output undervolt-

age, output overvoltage, and thermal-fault protection.

The MAX17019 is available in a 48-pin, 6mm x 6mm thin

QFN package.

Applications

● Embedded Control Systems

● Set-Top Boxes

Features

● Fixed-Frequency, Current-Mode Controllers

● 5.5V to 38V Input Range (Step-Down)

● 1x Step-Down Controller

● 1x Internal 5A

P-P

Step-Down Regulator

● 1x Internal 3A

P-P

Step-Down Regulator

● 1x 2A Source/Sink Linear Regulator with Dynamic

REFIN

● Internal BST Diodes

● Internal 5V 50mA Linear Regulator

● Fault Protection—Undervoltage, Overvoltage,

Thermal, Peak Current Limit

● Independent Enable Inputs and Power-Good Outputs

● Voltage-Controlled Soft-Start

● High-Impedance Shutdown

● 10μA (typ) Shutdown Current

19-4225; Rev 1; 10/14

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX17019ATM+ -40°C to +125°C 48 TQFN-EP*

MAX17019

36 35 34 33 32 31 30 29 28 27 26 25

CSPA

CSNA

AGND

REF

FREQ

UP/DN

INA

BYP

LDO5

INLDO

SHDN

ONB

SYNC

ONA

INBC

POKD

OND

ONC

FBC

POKC

BSTC

LXC

OUTD

IND

FBD

VTTR

REFIND

FBB

POKB

BSTB

LXB

DLA

BSTA

LXA

DHA

POKA

FBA

2 3 4 5 6 7 8 9 10 11 12

EXPOSED PAD = PGND

THIN QFN

TOP VIEW

MAX17019 High-Input-Voltage Quad-Output Controller

Pin Conguration

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (26 pages)

PAGE 1
EVALUATION KIT AVAILABLE High-Input-Voltage Quad-Output Controller ●● Embedded Control Systems ●● Set-Top Boxes ●● 1x Internal 3AP-P Step-Down Regulator ●● 1x 2A Source/Sink Linear Regulator with Dynamic REFIN ●● Internal BST Diodes ●● Internal 5V 50mA Linear Regulator ●● Fault Protection—Undervoltage, Overvoltage, Thermal, Peak Current Limit ●● Independent Enable Inputs and Power-Good Outputs ●● Voltage-Controlled Soft-Start ●● High-Impedance Shutdown ●● 10μA (typ) Shutdown Current Ordering Information
PAGE 2
MAX17019 High-Input-Voltage Quad-Output Controller Absolute Maximum Ratings INLDO, SHDN to GND............................................-0.3V to +43V LDO5, INA, VDD, VCC to GND.................................-0.3V to +6V DHA to LXA.............................................-0.3V to (VBSTA + 0.3V) ONA, ONB, ONC, OND to GND...............................-0.3V to +6V POKA, POKB, POKC, POKD to GND.........-0.3V to (VCC + 0.3V) REF, REFIND, FREQ, UP/DN, SYNC to GND.......................................
PAGE 3
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 4.75 5.0 5.
PAGE 4
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.5 1.6 V SHDN = 0~16V -2 +2 SHDN = 17V~38V -2 +150 0.5 1.
PAGE 7
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = -40°C to +125°C.
PAGE 8
MAX17019 High-Input-Voltage Quad-Output Controller Electrical Characteristics (continued) (Circuit of Figure 1, VINLDO = 12V, VINA = VINBC = VDD = VCC = VBYP = VCSPA = VCSNA = 5V, VIND = 1.8V, VSHDN = VONA = VONB = VONC = VOND = 5V, IREF = ILDO5 = IOUTD = no load, FREQ = GND, UP/DN = VCC, TA = -40°C to +125°C.
PAGE 9
MAX17019 High-Input-Voltage Quad-Output Controller Typical Operating Characteristics (TA = +25°C, Circuit of Figure 1, unless otherwise noted.) 85 VIN = 20V 75 VIN = 12V 70 65 60 4.95 95 4.90 4.85 VIN = 8V 50 0.001 0.01 0.1 1 4.75 10 0 VIN = 5V 70 65 0.01 LOAD CURRENT (A) 90 MAX17019 toc04 VIN = 5V VIN = 2.5V VIN = 3.3V 0.1 1 10 LOAD CURRENT (A) SMPS REGULATOR C EFFICIENCY vs. LOAD CURRENT VIN = 2.5V 85 80 EFFICIENCY (%) OUTPUT VOLTAGE (V) 75 50 0.001 0.5 1.0 1.5 2.0 2.
PAGE 10
MAX17019 High-Input-Voltage Quad-Output Controller Typical Operating Characteristics (continued) (TA = +25°C, Circuit of Figure 1, unless otherwise noted.) REG A STARTUP WAVEFORM (HEAVY LOAD) REG B STARTUP WAVEFORM (HEAVY LOAD) REG A SHUTDOWN WAVEFORM MAX17019 toc08 MAX17019 toc10 MAX17019 toc09 ONA ONA OUTA ONB OUTA POKA OUTB POKB POKA ILA ILA ILB LXA LXA LXB 400µs/div 400µs/div 400µs/div RLOAD = 1.6Ω ONA: 5V/div OUTA: 5V/div POKA: 5V/div ILA: 5A/div LXA: 10V/div RLOAD = 2.
PAGE 11
MAX17019 High-Input-Voltage Quad-Output Controller Typical Operating Characteristics (continued) (TA = +25°C, Circuit of Figure 1, unless otherwise noted.) REG A LOAD TRANSIENT (1A TO 3.2A) REG B LOAD TRANSIENT (0.4A TO 2A) MAX17019 toc14 OUTA LXA OUTC LXB LXC ILC ILB IOUTC IOUTB 20µs/div OUTA: 100mV/div LXA: 10V/div ILA: 2A/div IOUTA: 2A/div MAX17019 toc16 OUTB ILA IOUTA REG C LOAD TRANSIENT (0.8A TO 3A) MAX17019 toc15 20µs/div 20µs/div VINA = 12V, LOAD TRANSIENT IS FROM 1A TO 3.
PAGE 12
MAX17019 High-Input-Voltage Quad-Output Controller Pin Description PIN NAME 1 POKC Open-Drain Power-Good Output for the Internal 5A Step-Down Converter. POKC is low if FBC is more than 12% (typ) above or below the nominal 0.75V feedback regulation threshold. POKC is held low during startup and in shutdown. POKC becomes high impedance when FBC is in regulation. 2 BSTC Boost Flying Capacitor Connection for the Internal 5A Step-Down Converter.
PAGE 13
MAX17019 High-Input-Voltage Quad-Output Controller Pin Description (continued) PIN NAME FUNCTION 17 VCC 5V Analog Bias Supply. VCC powers all the analog control blocks (error amplifiers, current-sense amplifiers, fault comparators, etc.) and control logic. Connect VCC to the 5V system supply with a series 10Ω resistor, and bypass to analog ground using a 1µF or greater ceramic capacitor. 18 INA Input to the Circuit in Reg A in Boost Mode. Connect INA to LDO5 in step-down mode (UP/DN = VCC).
PAGE 14
MAX17019 High-Input-Voltage Quad-Output Controller Pin Description (continued) PIN NAME 36 FBB Feedback Input for the Internal 3A Step-Down Converter. FBB regulates to 0.75V. FUNCTION 37 ONB Switching Regulator B Enable Input. When ONB is pulled low, LXB is high impedance. When ONB is driven high, the controller enables the 3A internal switching regulator. 38 SYNC 39 ONA Switching Regulator A Enable Input. When ONA is pulled low, DLA and DHA are pulled low.
PAGE 15
MAX17019 High-Input-Voltage Quad-Output Controller C1 4.7µF, 6V 0603 INLDO SHDN LDO5 INA PWR VDD C2 R1 1.0µF, 6V 10Ω 0402 5%, 0402 BSTA UP/DN DHA VCC ONA ON OFF ONB ON OFF ONC ON OFF OND 5V SMPS OUTPUT C3 0.1µF, 6V 0402 NH1 NL1 DLA CSPA C8 0.1µF PWR CSNA FBA INBC BSTB POKA POKB POKC AGND C16 0.1µF, 6V 0402 C5 0.1µF, 6V 0402 LXB POKD L2 1µH, 7A, 14mΩ R5 14.0kΩ 1%, 0402 FREQ FBB SYNC AGND BSTC C6 0.1µF, 6V 0402 LXC REF C14 1000pF, 50V 0402 AGND R7 4.
PAGE 16
MAX17019 High-Input-Voltage Quad-Output Controller BYP UP/DN VCC LDO5 INLDO TSDN UP/DN = VCC [BUCK], LOW BUCK MODE TSDN MAX17019 VDD INA SHDN BYP_OK VCC_OK REF_OK ONLDO SW EN DRV FB VCC CSPA CSNA ONA BSTA LDO5 VCC BIAS EN VCCOK *ONA (SHDN) REG A ANALOG UVLO LXA VDD EN VCC REF DHA REF DLA VCC EN REFOK EN FBA SSDA+ SYNC OSC BSTB OND INBC IND VCC OUTD PGND FBD REG B ANALOG ONB INBC_OK REG D PWR LXB VDD EN FBB BSTC + REFIND CSB REG D ANALOG BYP VTTR VCC EN INBC
PAGE 17
MAX17019 High-Input-Voltage Quad-Output Controller SMPS Detailed Description LDO5 Bootstrap Switchover When the bypass input (BYP) exceeds the LDO5 bootstrap-switchover threshold for more than 500μs, an internal 1.5Ω (typ) p-channel MOSFET shorts BYP to LDO5, while simultaneously disabling the LDO5 linear regulator. This bootstraps the controller, allowing power for the internal circuitry and external LDO5 loading to be generated by the output of a 5V switching regulator.
PAGE 18
MAX17019 High-Input-Voltage Quad-Output Controller Table 1. FREQ Table REG A AND REG C REG B SWITCHING FREQUENCY SOFT-START TIME STARTUP BLANKING TIME SWITCHING FREQUENCY SOFT-START TIME STARTUP BLANKING TIME fSWA AND fSWC REG A: 1200/fSWA REG C: 900/fSWC 1500/fSWA fSWB 1800/fSWB 3000/fSWB LDO5 250kHz REG A: 4.8ms REG C: 3.6ms 6ms 500kHz 3.6ms 6ms REF 375kHz REG A: 3.2ms REG C: 2.4ms 4ms 750kHz 2.4ms 4ms GND 500kHz REG A: 2.4ms REG C: 1.8ms 3ms 1MHz 1.8ms 3ms SYNC 0.
PAGE 19
MAX17019 High-Input-Voltage Quad-Output Controller SMPS POR, UVLO, and Soft-Start soft-start sequence terminates, POK_ becomes high impedance as long as the output remains within ±8% (min) of the nominal regulation voltage set by FB_. POK_ goes low once its corresponding output drops 12% (typ) below its nominal regulation point, an output overvoltage fault occurs, or the output is shut down. For a logic-level POK_ output voltage, connect an external pullup resistor between POK_ and LDO5.
PAGE 20
MAX17019 High-Input-Voltage Quad-Output Controller VTT LDO Detailed Description • Input voltage range. The maximum value (VIN(MAX)) must accommodate the worst-case, high ACadapter voltage. The minimum value (VIN(MIN)) must account for the lowest battery voltage after drops due to connectors, fuses, and battery selector switches. If there is a choice at all, lower input voltages result in better efficiency. • Maximum load current. There are two values to consider.
PAGE 21
MAX17019 High-Input-Voltage Quad-Output Controller such as 1.0μH, 1.5μH, 2.2μH, 3.3μH, etc. Also look for nonstandard values, which can provide a better compromise in LIR across the input voltage range. If using a swinging inductor (where the no-load inductance decreases linearly with increasing current), evaluate the LIR with properly scaled inductance values.
PAGE 22
MAX17019 High-Input-Voltage Quad-Output Controller Internal SMPS Transient Response The load-transient response depends on the overall output impedance over frequency, and the overall amplitude and slew rate of the load step. In applications with large, fast load transients (load step > 80% of full load and slew rate > 10A/μs), the output capacitor’s high-frequency response—ESL and ESR—needs to be considered.
PAGE 23
MAX17019 High-Input-Voltage Quad-Output Controller is reasonably priced. Ensure that the MAX17019 DLA gate driver can supply sufficient current to support the gate charge and the current injected into the parasitic drain-to-gate capacitor caused by the high-side MOSFET turning on; otherwise, cross-conduction problems might occur. Switching losses are not an issue for the low-side MOSFET since it is a zero-voltage switched device when used in the step-down topology.
PAGE 24
MAX17019 High-Input-Voltage Quad-Output Controller VTT LDO Output Capacitor Selection (COUTD) VTT LDO Power Dissipation A minimum value of 20μF or greater ceramic is needed to stabilize the VTT output (OUTD). This value of capacitance limits the switching regulator’s unity-gain bandwidth frequency to approximately 1.2MHz (typ) to allow adequate phase margin for stability.
PAGE 25
MAX17019 High-Input-Voltage Quad-Output Controller Maximum Input Voltage The MAX17019 controller includes a minimum on-time specification, which determines the maximum input operating voltage that maintains the selected switching frequency (see the Electrical Characteristics table). Operation above this maximum input voltage results in pulse skipping to avoid overcharging the output.
PAGE 26
MAX17019 High-Input-Voltage Quad-Output Controller Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 0 8/08 Initial release — 1 10/14 Removed automotive references from the General Description and Applications 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.