Datasheet

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General Description

The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-

quiescent-current, low-dropout (LDO) regulators contain

simple boost preregulators operating at a high fre-

quency. The devices seamlessly provide a preset 3.3V

(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)

LDO output voltage from a cold-crank through load-dump

(3.5V to 80V) input voltage conditions. The MAX5092_/

MAX5093_ deliver up to 250mA with excellent load and

line regulation. During normal operation, when the battery

is healthy, the boost preregulator is completely turned off,

reducing quiescent current to 65μA (typ). This makes the

devices suitable for always-on power supplies.

The buck-boost operation achieved by this combination of

LDO and boost preregulator offers the advantage of using

a single off-the-shelf inductor in place of the multiple-

winding custom magnetics needed in typical single-ended

primary inductor converter (SEPIC) and transformer-

based flyback topologies. The high operating frequency

of the boost regulator significantly reduces component

size. The MAX5092_ integrates a blocking diode to fur-

ther reduce the external component count. The boost

preregulator output voltage is preset to 7V. Both LDO and

boost output voltages are programmable using external

resistors. The boost preregulator output voltage is adjust-

able up to 11V(MAX5092_), or up to 12V (MAX5093_).

The LDO output voltage is adjustable from 1.5V to 9V

(MAX5092_) or from 1.5V to 10V (MAX5093_).

The devices feature a shutdown mode with 5μA (typ) shut-

down current, a HOLD input to implement a self-holding cir-

cuit, and a power-on-reset output (RESET) with an externally

programmable timeout period. Additional features include

output overload, short-circuit, and thermal protection.

The MAX5092_/MAX5093_ are available in a thermally

enhanced, 16-pin 5mm x 5mm thin QFN package and

can dissipate up to 2.7W at +70°C on a multilayer PC

board (PCB).

Applications

● Industrial

Features

● Wide Operating Input Voltage Range: 3.5V to 72V

with a 4V Startup Voltage

● LDO Output Regulates to 5V Seamlessly from an

Input Voltage of 3.5V to 72V

● Up to 250mA Output Current

● Preset 3.3V, 5V, or Externally Programmable LDO

Output Voltage from 1.5V to 9V (MAX5092_) or from

1.5V to 10V (MAX5093_)

● Preset 7V or Externally Programmable Boost

Output Voltage Up to 11V (MAX5092_) or Up to 12V

(MAX5093_)

● 65μA Quiescent Current in LDO Mode (V

≥ 8V)

5μA Shutdown Current

● Power-On Reset (RESET) with Programmable

Timeout Period

● Output Short-Circuit and Thermal Protection

● TQFN Package Capable of Dissipating Up to 2.7W at

+70°C

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

19-0659; Rev 2; 10/14

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

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX5092AATE+ -40°C to +125°C 16 TQFN-EP*

MAX5092BATE+ -40°C to +125°C 16 TQFN-EP*

MAX5093AATE+ -40°C to +125°C 16 TQFN-EP*

MAX5093BATE+ -40°C to +125°C 16 TQFN-EP*

HOLD

BSOUT

PGND_BST

12 11 9

RESET

OUT

OUT_SENSE

SET

PGND_LDO

MAX5092_/

MAX5093_

SGND LX

BSFB

THIN QFN

(5mm x 5mm)

TOP VIEW

MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator

Pin Conguration

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (23 pages)

PAGE 1
EVALUATION KIT AVAILABLE 4V to 72V Input LDOs with Boost Preregulator Applications ●● Industrial ●● Up to 250mA Output Current ●● Preset 3.3V, 5V, or Externally Programmable LDO Output Voltage from 1.5V to 9V (MAX5092_) or from 1.
PAGE 2
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Absolute Maximum Ratings IN, EN, LX, BSOUT to SGND..................................-0.3V to +80V PGND_BST, PGND_LDO to SGND.......................-0.3V to +0.3V RESET, OUT, OUT_SENSE to SGND....................-0.3V to +12V BSOUT to LX (MAX5092_)......................................-0.3V to +12V VL, SET, BSFB, SGND..............................................-0.3V to +6V HOLD to SGND.....................................-0.3V to (VOUT + 0.
PAGE 3
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Electrical Characteristics (continued) (VIN = VEN = 14V, IOUT = 1mA, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = TJ = -40°C to +125°C, unless otherwise noted. See Figures 4–7 as applicable. Typical specifications are at TA = +25°C.) (Note 2) PARAMETER Boost Internal Switch Maximum On-Time Internal Switch Current Limit SYMBOL tON-max ILIM Measured in steady-state condition MIN TYP MAX UNITS 1.80 2.25 2.70 µs 3.
PAGE 4
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Electrical Characteristics (continued) (VIN = VEN = 14V, IOUT = 1mA, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = TJ = -40°C to +125°C, unless otherwise noted. See Figures 4–7 as applicable. Typical specifications are at TA = +25°C.
PAGE 5
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Typical Operating Characteristics (VIN = VEN = 14V, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = +25°C, unless otherwise noted.) (See Figures 4–7 as applicable.) 70 65 IOUT = 10mA 60 24 32 40 48 56 64 5.0 5.5 6.0 6.5 60 -15 -40 10 35 60 85 110 QUIESCENT SUPPLY CURRENT vs. TEMPERATURE (MAX5093B) SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE (MAX5092B) SHUTDOWN SUPPLY CURRENT vs.
PAGE 6
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = +25°C, unless otherwise noted.) (See Figures 4–7 as applicable.) LINE-TRANSIENT RESPONSE (VIN STEP FROM 3.5V TO 72V) LINE-TRANSIENT RESPONSE (VIN STEP FROM 4V TO 7V) MAX5092/93 toc10 MAX5092/93 toc09 IOUT = 250mA VOUT 50mV/div IOUT = 5mA VIN 50V/div 5V (AC-COUPLED) 72V 3.
PAGE 7
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = +25°C, unless otherwise noted.) (See Figures 4–7 as applicable.) POWER-SUPPLY REJECTION RATIO vs.
PAGE 8
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47μF, CBSOUT = 22μF, COUT = 10μF, CVL = 1μF, TA = +25°C, unless otherwise noted.) (See Figures 4–7 as applicable.) VOUT vs. TEMPERATURE (MAX5092B) VOUT vs. TEMPERATURE MAX5092/93 toc23 3.34 MAX5092/93 toc24 5.10 MAX5092/93 toc22 3.36 LDO LOAD-TRANSIENT RESPONSE (MAX5092B) 5.05 VOUT 50mV/div VOUT (V) VOUT (V) 3.32 3.30 (AC-COUPLED) 5.00 3.28 IOUT 100mA/div 4.
PAGE 9
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Pin Description PIN NAME FUNCTION 1 IN Input Supply Voltage. Bypass IN to the power ground plane with a 47µF (low-ESR) aluminum electrolytic capacitor in parallel with a 1µF ceramic capacitor placed as close to the IC as possible. 2 EN Enable Input. Drive EN high to turn on the IC. Drive EN low to disable the IC. Connect EN directly to IN for always-on operation. 3 SGND Signal Ground.
PAGE 10
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Functional Diagrams IN 1µs ONE-SHOT MAX5092_ OUT VL VL INTERNAL LDO LX IN LX BSOUT S Q R Q DRIVER BSOUT CURRENT-LIMITING COMPARATOR R1 RS OUT MUX IN R2 BSOUT VDIS_TH VREF LDO BST_DIS OUT HOLD EN BSFB VPK 2.25µs ONE-SHOT VREF OUT OUT ERROR AMPLIFIER OUT_SENSE CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION R3 R4 VL CT COMPARATOR MUX 2µA SET CT DELAY COMPARATOR RESET 0.
PAGE 11
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Functional Diagrams (continued) IN 1µs ONE-SHOT MAX5093_ OUT VL VL INTERNAL LDO LX IN LX BSOUT S Q R Q DRIVER BSOUT CURRENT-LIMITING COMPARATOR R1 RS OUT MUX IN R2 BSOUT VDIS_TH VREF LDO BST_DIS OUT HOLD EN BSFB VPK 2.25µs ONE-SHOT VREF OUT OUT ERROR AMPLIFIER OUT_SENSE CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION R3 R4 VL CT COMPARATOR MUX 2µA SET CT DELAY COMPARATOR RESET 0.
PAGE 12
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Detailed Description The MAX5092A/MAX5092B/MAX5093A/MAX5093B include a step-up, switch-mode DC-DC converter and a linear regulator to provide step-up/-down voltage conversion over a wide range of input voltages. This combination of an LDO and a boost converter offers the advantage of using a single off-the-shelf inductor in place of the multiple-winding custom magnetics needed in typical SEPIC or transformer-based flyback topologies.
PAGE 13
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Internal Regulator (VL) An internal regulator (VL) is used to supply all internal lowvoltage blocks. Bypass VL to SGND with a 1μF ceramic capacitor placed as close to the IC as possible. VVL regulates to 5.5V when VBSOUT is above 5.5V. VVL tracks the voltage at BSOUT when VBSOUT is below 5.5V.
PAGE 14
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Applications Information Diagrams L1 4.7µH 10 INPUT 4V TO 72V 1 C1* 47µF 11 LX LX VL IN C2* 1µF BSOUT R1 100kΩ 16 ON 2 OFF C6 1µF U1 MAX5092B VOUT RESET 3 PGND_BST RESET BSFB EN HOLD SGND OUT_SENSE OUT 15 CT C5 0.22µF *** 14 PGND_LDO SET 7V 9 12 C3* 1µF C4* 22µF 13 4 µP SIGNAL 7 OUTPUT 5V AT 250mA** 8 5 6 C7 10µF VOUT P P *THESE CAPACITORS MUST BE RATED AT THE HIGHEST VIN VOLTAGE.
PAGE 15
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Applications Information Diagrams (continued) L1 4.7µH 10 INPUT 4V TO 72V 1 C1* 47µF 11 LX LX VL IN C2* 1µF BSOUT R1 100kΩ 16 ON 2 OFF C6 1µF U1 MAX5093B VOUT RESET 14 3 PGND_BST RESET BSFB EN HOLD SGND OUT_SENSE OUT 15 CT C5 0.22µF *** PGND_LDO SET 7V 9 12 C3* 1µF C4* 22µF 13 4 µP SIGNAL 7 OUTPUT 5V AT 250mA** 8 5 6 C7 10µF VOUT P P *THESE CAPACITORS MUST BE RATED AT THE HIGHEST VIN VOLTAGE.
PAGE 16
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Applications Information Diagrams (continued) L1 4.7µH 10 INPUT 4V TO 72V 1 C1* 47µF LX VL IN C2* 1µF 16 RESET PGND_BST BSFB 2 OFF 3 EN HOLD SGND OUT_SENSE OUT 15 C5 0.22µF *** CT 5.5V C6 1µF BSOUT R3 100kΩ ON 14 U1 MAX5092A VOUT RESET 11 LX PGND_LDO SET OUTPUT 5.3V 9 12 C3* 1µF C4* 22µF R1 1.65MΩ 13 4 µP SIGNAL VOUT 7 OUTPUT 3.
PAGE 17
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Applications Information Diagrams (continued) L1 4.7µH 10 INPUT 4V TO 72V 1 C1* 47µF LX VL IN C2* 1µF C6 1µF BSOUT R3 100kΩ 16 RESET PGND_BST BSFB ON 2 OFF 3 EN HOLD SGND OUT_SENSE OUT 15 C5 0.22µF *** 14 U1 MAX5093A VOUT RESET 11 LX CT PGND_LDO SET OUTPUT 12V 9 12 C3* 1µF C4* 22µF R1 4.
PAGE 18
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Design Guidelines Input Capacitor (CIN) and Boost Capacitor (CBSOUT) Selection The input current waveform of the boost converter is continuous, and usually does not demand high capacitance at its input. However, the MAX5092_/MAX5093_ boost converter is designed to fully turn on as soon as the input drops below a certain voltage in order to ride out coldcrank droops. This operation demands low input source impedance for proper operation.
PAGE 19
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Setting the Boost Output Voltage (VBSOUT) Schottky Diode Selection (MAX5093_) The MAX5092_/MAX5093_ feature Dual Mode™ operation for the internal boost converter output voltage. These devices operate in a preset output-voltage mode or an adjustable output-voltage mode. In preset mode, internal trimmed feedback resistors set VBSOUT to a fixed 7V. Select the preset mode by directly connecting BSFB to SGND (Figures 4 and 5).
PAGE 20
MAX5092/MAX5093 1.5 PDISS includes the losses in the boost converter operation and the LDO itself. The boost converter loss PLOSS(BST), depends on VIN, VBSOUT, and IOUT. See the Boost Converter Power Loss graphs in the Typical Operating Characteristics to estimate the losses at a given VIN and VBSOUT at room temperature. At a higher ambient temperature of +105°C, PLOSS(BST) increases by up to 20% due to higher RDS-ON and switching losses of the internal boost converter MOSFET.
PAGE 21
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Typical Operating Circuit INPUT 4V TO 72V LX LX VL IN MAX5092B VOUT +7V OUTPUT BSOUT RESET OUTPUT ENABLE RESET PGND_BST BSFB EN HOLD SGND OUT_SENSE +5V OUTPUT OUT VOUT * CT PGND_LDO P P SET *SEE PCB LAYOUT GUIDELINES SECTION. www.maximintegrated.
PAGE 22
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Selector Guide PART PRESET LDO OUTPUT (V) ADJUSTABLE LDO OUTPUT PRESET BSOUT OUTPUT (V) ADJUSTABLE BSOUT OUTPUT BOOST DIODE MAX5092AATE+ 3.3 Yes 7 Yes Internal MAX5092BATE+ 5 Yes 7 Yes Internal MAX5093AATE+ 3.3 Yes 7 Yes External MAX5093BATE+ 5 Yes 7 Yes External Chip Information PROCESS: BiCMOS www.maximintegrated.
PAGE 23
MAX5092/MAX5093 4V to 72V Input LDOs with Boost Preregulator Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 10/06 Initial release 1 1/08 Updated Ordering Information and Electrical Characteristics table, added two Typical Operating Characteristics graphs, updated Functional Diagrams and Applications Information Diagrams, added boost converter details 1–12, 14–17, 19, 22, 23 2 10/14 Removed automotive references from the General Description, Applications, Detailed Description, a