Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - linear/switching voltage regulator Automotive TQFN 32 (7x7)

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Automotive Power-Management IC with

Three Step-Down Converters and Linear Regulator

MAX16920

19-5718; Rev 1; 8/11

General Description

The MAX16920 power-management IC integrates

three high-voltage step-down DC-DC converters, one

high-voltage linear regulator, and an overvoltage

protection block. The three step-down converters deliver

up to 150mA, 600mA, and 1.5A, while the linear regulator

is capable of up to 150mA. The MAX16920 is designed

to operate with input voltages between 5.5V to 28V and

survive voltage transients to 45V, making it ideal for

automotive applications.

The MAX16920 is optimized for high efficiency and

low standby current. The MAX16920A features 400kHz

switching frequency, while the MAX16920B features

2MHz switching frequency. The MAX16920 can be

ordered with spread-spectrum frequency modulation.

The DC-DC converters can also be synchronized to

an external frequency reference using the SYNC input

minimize EMI.

The MAX16920 includes power-good outputs (PG_) for

DC-DC2, DC-DC3, LDOA, and a power-on reset (POR)

for DC-DC1. All regulators other than DC-DC1 have

an enable input (EN_). DC-DC1 always operates when

power is applied to the MAX16920.

The MAX16920 operates over the -40°C to +125°C

temperature range, and is available in a compact,

thermally enhanced 32-pin TQFN package (7mm x 7mm).

Applications

Automotive Radios

Automotive Navigation Systems

Features

S 5.5V to 28V Wide Operating Voltage Range

S Tolerates Input Voltage Transients Up to 45V

S Three High-Voltage Buck Converters with High

Efficiency

DC-DC1: 150mA (max), Always-On, Ultra-Low

Quiescent Current (25µA)

3.3V Fixed or Adjustable from 1.22V to 5V

S DC-DC2: 600mA (max), 5.0V Fixed or Adjustable

Output Voltage from 1.22V to 5V

S DC-DC3: 1.5A (max), 3.3V Fixed or Adjustable

from 1.22V to 8.0V

S One High-Voltage 5V Linear Regulator (150mA)

S pMOS Driver Output with Fixed Overvoltage

Shutdown

400kHz (MAX16920A) or 2MHz (MAX16920B)

Switching Frequency

S Frequency Synchronization Input

S Open-Drain Power-Good Outputs for DC-DC2,

DC-DC3, LDOA, and Power-On Reset for DC-DC1

S Enable Inputs for DC-DC2, DC-DC3, and LDO

S Internal Soft-Start

S ±2% Undervoltage Comparator

S Overtemperature Shutdown

S -40°C to +125°C Operating Temperature Range

S Compact 32-Pin TQFN Package (7mm x 7mm)

Ordering Information

/V denotes an automotive qualified part.

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

*Future product—contact factory for availability.

**EP = Exposed pad.

†Contact the factory for other POR options.

EVALUATION

KIT

AVAILABLE

PART TEMP RANGE

SWITCHING

FREQUENCY

POR

DELAY

†

(ms)

PIN-PACKAGE

MAX16920AATJ/V+*

-40NC to +125NC

400kHz 5.1 32 TQFN-EP**

MAX16920AATJS/V+*

-40NC to +125NC

400kHz 5.1 32 TQFN-EP**

MAX16920BATJ/V+

-40NC to +125NC

2.2MHz 7.5 32 TQFN-EP**

MAX16920BATJS/V+*

-40NC to +125NC

2MHz 8 32 TQFN-EP**

Summary of content (20 pages)

PAGE 1
9-5718; Rev 1; 8/11 TION KIT EVALUA BLE AVAILA Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator Features The MAX16920 power-management IC integrates three high-voltage step-down DC-DC converters, one high-voltage linear regulator, and an overvoltage protection block. The three step-down converters deliver up to 150mA, 600mA, and 1.5A, while the linear regulator is capable of up to 150mA. The MAX16920 is designed to operate with input voltages between 5.
PAGE 2
MAX16920 Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator ABSOLUTE MAXIMUM RATINGS OUT1, OUT2, FB1, FB2, FB3, POR, PG2, PG3, PGA, OT to GND..........................................-0.3V to +6V UVO, EN2, EN3, ENA, OUTA, SYNC, VL to GND....-0.3V to +6V UVI, UVS to GND...................................................-0.3V to +20V UVI, UVS Input Current.................................................... ±10mA OUT3 to GND....................................................
PAGE 3
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 ELECTRICAL CHARACTERISTICS (continued) (VINA = VINB = 14V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX16920 Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator ELECTRICAL CHARACTERISTICS (continued) (VINA = VINB = 14V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER DC-DC Load Regulation DC-DC Line Regulation SYMBOL LoREG LiREG CONDITIONS Duty-Cycle Range (Note 3) tSS DCR Input Voltage to Maintain Constant Switching with VOUT_ = 1.
PAGE 5
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 ELECTRICAL CHARACTERISTICS (continued) (VINA = VINB = 14V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL EN2, EN3, ENA, SYNC Input Low Voltage VIL EN2, EN3, ENA, SYNC Input High Voltage VIH EN2, EN3, ENA, SYNC Input Hysteresis VH SYNC Input Pulldown Resistor CONDITIONS MIN TYP MAX UNITS 0.4 V 1.
PAGE 6
Typical Operating Characteristics (continued) (VINA = VINB = 14V, TA = +25°C, unless otherwise noted. Data measured on MAX16920B, see Figure 5 for application circuit.) DC-DC3 OUTPUT VOLTAGE vs. TEMPERATURE IOUT3 = 1A 3.45 IOUT2 VOUT3 (V) 0A 3.40 100mV/div VOUT2 (AC-COUPLED) 3.40 3.35 3.30 3.35 3.30 3.25 3.25 3.20 3.20 3.15 3.15 3.10 200ms/div IOUT3 = 1A 3.45 VOUT3 (V) 500mA/div DC-DC3 LINE REGULATION 3.50 3.
PAGE 7
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator 100 VIN_ VIN = 8V 90 10V/div 0V VSB_OUT (100kI LOAD AT SB_OUT) 70 60 50 40 80 40 20 10 EN2 = EN3 = ENA = GND 1 EN3 = ENA = GND 0 10 100 60 120 180 240 300 360 420 480 540 600 1000 IOUT2 (mA) IOUT1 (mA) DC-DC1 STARTUP INTO FULL LOAD DC-DC3 EFFICIENCY vs. LOAD CURRENT MAX16920 toc18 90 EFFICIENCY (%) 80 60 DC-DC2 STARTUP INTO FULL LOAD MAX16920 toc19 100 70 VIN = 18V 50 30 0.
PAGE 8
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 Pin Configuration EN3 UVI UVS OUT3 FB3 PGNDA LX3 BST3 TOP VIEW 24 23 22 21 20 19 18 17 EN2 25 16 BST2 0T 26 15 VINB UVO 27 14 LX2 13 PGNDB 12 LX1 11 VINA 10 BST1 9 ODRV SYNC 28 MAX16920 PG3 29 PG2 30 PGA 31 EP* + 5 6 7 8 FB2 OUTA VL GND 4 FB1 3 OUT2 2 OUT1 1 ENA POR 32 TQFN *CONNECT TO GND.
PAGE 9
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator PIN NAME 13 PGNDB 14 LX2 FUNCTION Power Ground for DC-DC1 and DC-DC2 DC-DC2 Converter Switching Node. Connect an LC filter to LX2. Use a capacitor with a maximum ESR of 0.3I. 15 VINB Battery Supply-Voltage Input. VINB supplies power to DC-DC2 and DC-DC3. 16 BST2 Bootstrap Capacitor Connection for DC-DC2. Connect a 0.1FF capacitor from BST2 to LX2. 17 BST3 Bootstrap Capacitor Connection for DC-DC3. Connect a 0.
PAGE 10
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 Functional Diagram VINB VINA VL ODRV INTERNAL REGULATOR FET DRIVE BST1 VINA VOLTAGE SENSE UVI DC-DC1 30V PGNDB LX1 OUT1 FB1 POR BST2 UVS VINB CONTROL LX2 DC-DC2 FB2 OUT2 EN2 DIVIDE BY 2* OVERTEMPERATURE SENSOR LX3 VINB DC-DC3 OUT3 VINA LDO *DIVIDE BY 2 IS ONLY FOR MAX16920A.
PAGE 11
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator The MAX16920 power-management IC integrates three high-voltage step-down DC-DC converters, one highvoltage linear regulator, and an overvoltage protection block. The three step-down converters deliver up to 150mA, 600mA, and 1.5A, while the linear regulator is capable of up to 150mA. The MAX16920 is designed to operate with input voltages between 5.
PAGE 12
MAX16920 Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator voltage following the normal soft-start sequence. If the MAX16920 die reaches the thermal limit of +170˚C (typ) (temperature rising) OUT2 is immediately shut off. 0.1µF BATTERY INPUT 10µH P 10µF VINA VINB ODRV MAX16920 Figure 1. Holding Up OUT1 During Input Undervoltage Events an adjustable output between 1.22V to 5.5V. DC-DC2 operates in PWM mode only. DC-DC2 is activated by driving EN2 high.
PAGE 13
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator Power-Good Output (PG3) DC-DC3 provides an open-drain power-good output (PG3). PG3 is an active-high output that pulls high when the output voltage (OUT3) is above 91.5% of its nominal value. In standby mode, PG3 is high impedance. Linear Regulator (OUTA) The MAX16920 features a fixed 5V output linear regulator (OUTA). OUTA provides up to 150mA load current. Connect an external capacitor of at least 4.7µF from OUTA to GND.
PAGE 14
MAX16920 Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator Undervoltage Output (UVO) The MAX16920 features an active-low undervoltage output (UVO) to monitor the input voltage. UVO is pulled low when the voltage at UVI falls below 1.205V. To monitor battery voltage, connect a resistive divider between the battery, UVI, and UVS. An undervoltage condition asserts the UVO flag only and does not effect the regulator outputs. capacitor.
PAGE 15
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator V D = OUT VIN where IOUT is the output current, D is the duty cycle, and fSW is the switching frequency. Use additional input capacitance at lower input voltages to avoid possible undershoot below the UVLO threshold during transient loading. Output Capacitor Selection The allowable output voltage ripple and the maximum deviation of the output voltage during step load currents determine the output capacitance and its ESR.
PAGE 16
MAX16920 Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator DC-DC3 OUTPUT 7.4V R1 = 100kI RTOP R2 = 50kI RBOT OUT1/OUT3 Ri1 = 212kI FBi VFB_ = 1.21V Ri2 = 121kI FB1/FB3 USE INTERNAL ~750mV Figure 3. Typical Application Circuit for Setting OUT1 or OUT3 Above 3.
PAGE 17
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator 6) Place the VINA, VINB, and VL bypass capacitors as close as possible to the device. If using multiple bypass capacitors, place the lowest value capacitor closest to the pin. The ground connection of the VL bypass capacitor should be connected directly to the GND pin with a wide trace. 7) Keep any feedback traces as short and small as possible to prevent noise pickup.
PAGE 18
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 Typical Operating Circuits 10µH P BATTERY INPUT SB_OUT 10µF R1 100kI UVI VINA VINB ODRV BST1 0.47µF R2 19.1kI 3.3V/150mA OUT1 UVS 47µF 0.1µF SYNC MAX16920A VL 4.7µF FB1 BST2 0.1µF 22µH EN2 LX2 EN3 5V/600mA OUT2 ENA 47µF FB2 BST3 UVO 0.1µF 10µH OT OUT1 47µH LX1 LX3 POR 3.3V/1.5A OUT3 PG2 150µF FB3 PG3 PGA GND PGNDA PGNDB Figure 4.
PAGE 19
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator BATTERY INPUT 10µH P SB_OUT 10µF R1 100kI UVI VINA VINB ODRV BST1 0.47µF R2 19.1kI 3.3V/150mA OUT1 UVS 10µF 0.1µF SYNC MAX16920B VL 4.7µF FB1 BST2 0.1µF 4.7µH EN2 LX2 EN3 5V/600mA OUT2 ENA 22µF FB2 BST3 UVO 0.1µF 2.2µH OT OUT1 8.2µH LX1 LX3 POR 3.3V/1.5A OUT3 PG2 100µF FB3 PG3 PGA GND PGNDA PGNDB 5V/150mA OUTA 4.7µF Figure 5.
PAGE 20
Automotive Power-Management IC with Three Step-Down Converters and Linear Regulator MAX16920 Revision History REVISION NUMBER REVISION_ DATE 0 12/10 Initial release 8/11 Added the spread-spectrum option; updated the Electrical Characteristics table and added Note 4; included output voltage setting application instructions; added the Spread-Spectrum Option section; added new Figure 3 (typical application circuit for setting OUT1 or OUT3 above 3.