Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positive, fixed or adjustable TQFN 16 (5x5)

General Description

The MAX5087 high-voltage linear regulator operates

from an input voltage of 6.5V to 45V and delivers up

to 400mA of output current. The device consumes only

70μA of quiescent current with no load and 11μA in

shutdown. The device includes a SET input, that when

connected to ground, selects a preset output voltage of

3.3V (MAX5087A) or 5.0V (MAX5087B). Alternatively, the

output voltage can be adjusted from 2.5V to 11V by simply

connecting SET to the regulator’s output through a resis-

tive divider network. The MAX5087 also provides an open-

drain, active-low microprocessor (μP) reset output that

asserts when the regulator output drops below the preset

output voltage threshold. An external capacitor programs

the reset timeout period. Other features include an enable

input, thermal shutdown, and short-circuit protection.

The MAX5087 operates over the automotive temperature

range of -40°C to +125°C and is available in a 16-pin

TQFN thermally enhanced package.

Applications

● Industrial

● Home Security/Safety

● Networking

Features

● Wide Operating Input Voltage Range (6.5V to 45V)

● Thermally Enhanced Package Dissipates

2.6W at T

= +70°C (16-Pin TQFN)

● Guaranteed 400mA Output Current

● 70μA Quiescent Supply Current

● Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output

Voltage

● Remote Load Sense Capability

● Enable Input

● Integrated μP Reset Circuit with Programmable

Timeout Period

● Thermal and Short-Circuit Protection

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

19-3964; Rev 6; 5/14

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

*EP = Exposed paddle.

+Denotes lead-free package.

PART PIN-PACKAGE

OUTPUT

VOLTAGE (V)

MAX5087AATE+ 16 TQFN-EP* 3.3

MAX5087BATE+ 16 TQFN-EP* 5.0

MAX5087BATE/V+ 16 TQFN-EP* 5.0

12 11 10 9

OUT

OUTSENSE

GND

TOP VIEW

N.C.

1 2 3 4

N.C.

MAX5087

N.C.

RESET

SET

TQFN

MAX5087 45V, 400mA, Low-Quiescent-Current

Linear Regulator with Adjustable Reset Delay

Ordering Information

Pin Conguration

EVALUATION KIT AVAILABLE

Summary of content (12 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay General Description The MAX5087 high-voltage linear regulator operates from an input voltage of 6.5V to 45V and delivers up to 400mA of output current. The device consumes only 70μA of quiescent current with no load and 11μA in shutdown. The device includes a SET input, that when connected to ground, selects a preset output voltage of 3.3V (MAX5087A) or 5.0V (MAX5087B).
PAGE 2
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Absolute Maximum Ratings IN to GND (do not exceed package power dissipation)..........................................................-0.3V to +50V IN to GND (T ≤ 300ms, IOUT ≤ 250mA)..................-0.3V to +42V EN to GND..............................................................-0.3V to +50V RESET, OUT, OUTSENSE to GND.........................-0.3V to +12V IN to OUT................................................
PAGE 3
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Electrical Characteristics (continued) (VIN = 14V, IOUT = 1mA, CIN = 47μF (low ESR), COUT = 15μF, VEN = 2.4V, 10kΩ from RESET to OUT, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 2) PARAMETER Enable Input Current SYMBOL IEN CONDITIONS MIN TYP VEN = 2.4V 0.35 VEN = 14V 3.4 MAX UNITS µA SET Reference Voltage VSET 1.200 1.235 1.
PAGE 4
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Typical Operating Characteristics (VIN = VEN = 14V, CIN = 47μF (low ESR), COUT = 15μF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specified.) 4.5 IGND (A) 3.0 2.5 2.0 1.5 1.0 IOUT = 0 0.5 15 20 25 30 35 40 45 -40 -25 -10 5 20 35 50 65 80 95 110 125 6 VIN = +6.5V 5 5.05 5.00 4.95 IOUT = 400mA 3 2 4.85 IOUT = 50mA IOUT = 5mA 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 VIN = +6.5V 5.
PAGE 5
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47μF (low ESR), COUT = 15μF, VOUT = 5V, SET = GND, TA = +25°C, unless otherwise specified.
PAGE 6
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Pin Description PIN NAME 1, 12–16 N.C. 2 EN Enable Input. Drive EN high to turn on the regulator. Force EN low to place the device in shutdown mode. 3, 4 IN Regulator Input. Supply voltage ranges from 6.5V to 45V. Bypass IN to GND with a low-ESR 47µF electrolytic capacitor. 5, 6 OUT 7 OUTSENSE 8 GND Ground 9 SET Feedback Regulation Set Point. Connect SET to GND for a fixed 3.3V output (MAX5087A) or 5.
PAGE 7
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay IN ERROR AMPLIFIER MAX5087 VREF 1.235V CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION OUTSENSE MUX EN OUT INTERNAL SUPPLY VOLTAGE SET 2µA CT DELAY COMPARATOR CT COMPARATOR RESET 0.92 x VREF GND Figure 1. Functional Diagram www.maximintegrated.
PAGE 8
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Detailed Description The MAX5087 high-voltage linear regulator includes an integrated μP reset circuit with an adjustable reset timeout period (see the Adjustable Reset Timeout Period (CT) section). The device guarantees a 400mA load current and is available with a preset output voltage of 3.3V (MAX5087A) or 5V (MAX5087B). Both devices can be configured to provide an adjustable output voltage from 2.5V to 11V.
PAGE 9
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Applications Information VOUT = 3.5 3.0 2.5 PD (W) The MAX5087 features a Dual ModeTM operation, in either a preset-voltage mode or an adjustable mode. In preset-voltage mode, internal feedback resistors set the MAX5087’s output voltage to +3.3V or +5V. Select presetvoltage mode by connecting SET to ground. In adjustable mode, select an output between +2.
PAGE 10
45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Calculate package dissipation at the given temperature as follows: ° (125°C − 70 = °C) 0.8345W And establish the maximum current: (1.191W) = 92.7mA (14V) − (5V) = I OUT(MAX) 0.40 TA = +70°C TA = +85°C TA = +125°C 0.35 0.30 0.25 0.20 0.15 0.10 Example 3: 0.05 TA = +50°C 0 VIN = +14V VOUT = +5V 0.45 IOUT(MAX) (A) = P 2.666W − 0.0333 0.
PAGE 11
MAX5087 Chip Information PROCESS: BiCMOS www.maximintegrated.com 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 12
MAX5087 45V, 400mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 2/06 Initial release 1 4/06 Updated Ordering Information and Electrical Characteristics tables. 2 7/06 Updated Electrical Characteristics table. 3 2/08 Corrected errors in data sheet, reduced operating range, and removed products from Ordering Information table.