Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positive, fixed or adjustable SOIC 8 N

_______________General Description

The MAX667 low-dropout, positive, linear voltage regu-

lator supplies up to 250mA of output current. With no

load, it has a typical quiescent current of 20µA. At

200mA of output current, the input/output voltage differ-

ential is typically 150mV. Other features include a low-

voltage detector to indicate power failure, as well as

early-warning and low-dropout detectors to indicate an

imminent loss of output voltage regulation. A shutdown

control disables the output and puts the circuit into a

low quiescent-current mode.

The MAX667 employs Dual Mode™ operation. One

mode uses internally trimmed feedback resistors to pro-

duce +5V. In the other mode, the output may be varied

from +1.3V to +16V by connecting two external resistors.

The MAX667 is a pin-compatible upgrade to the

MAX666 in most applications where the input voltages

are above +3.5V. Choose the MAX667 when high out-

put currents and/or low dropout voltages are desired,

as well as for improved performance at higher

temperatures.

________________________Applications

Battery-Powered Devices

Pagers and Radio Control Receivers

Portable Instruments

Solar-Powered Instruments

____________________________Features

♦ 350mV Max Dropout at 200mA

♦ 250mA Output Current

♦ Normal Mode: 20µA Typ Quiescent Current

Shutdown Mode: 0.2µA Typ Quiescent Current

♦ Low-Battery Detector

♦ Fixed +5V (Min Component Count) or

Adjustable Output

♦ +3.5V to +16.5V Input

♦ Dropout Detector Output

♦ 10µF Output Capacitor

MAX667

+5V/Programmable Low-Dropout

Voltage Regulator

________________________________________________________________ Maxim Integrated Products 1

__________________Pin Configuration

__________Typical Operating Circuit

19-3894; Rev 4; 9/08

LBO

SET

SHDN

GND

LBI

OUT

MAX667

DIP/SO

TOP VIEW

MAX667

GND SHDNSET

OUT

+5V OUT

10μF

+6.3V

BATTERY

PART TEMP RANGE PIN-PACKAGE

MAX667CPA 0°C to +70°C 8 Plastic DIP

MAX667CSA 0°C to +70°C 8 SO

MAX667C/D 0°C to +70°C

Dice*

MAX667EPA -40°C to +85°C 8 Plastic DIP

MAX667ESA -40°C to +85°C 8 SO

MAX667MJA -55°C to +125°C 8 CERDIP**

*Contact factory for dice specifications.

**Contact factory for availability and processing to MIL-STD-883.

†Contact factory for availability.

Dual Mode is a trademark of Maxim Integrated Products.

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.

MAX667MSA/PR -55°C to +125°C 8 SO†

MAX667MSA/PR-T -55°C to +125°C 8 SO†

Ordering Information

Summary of content (9 pages)

PAGE 1
9-3894; Rev 4; 9/08 +5V/Programmable Low-Dropout Voltage Regulator The MAX667 low-dropout, positive, linear voltage regulator supplies up to 250mA of output current. With no load, it has a typical quiescent current of 20µA. At 200mA of output current, the input/output voltage differential is typically 150mV. Other features include a lowvoltage detector to indicate power failure, as well as early-warning and low-dropout detectors to indicate an imminent loss of output voltage regulation.
PAGE 2
MAX667 +5V/Programmable Low-Dropout Voltage Regulator ABSOLUTE MAXIMUM RATINGS Input Supply Voltage ...........................................................+18V Output Short Circuited to Ground.........................................1sec LBO Output Sink Current ....................................................50mA LBO Output Voltage ...............................................GND to VOUT SHDN Input Voltage ....................................-0.3V to (VIN + 0.3V) Input Voltages LBI, SET..........
PAGE 3
+5V/Programmable Low-Dropout Voltage Regulator QUIESCENT CURRENT vs. LOAD CURRENT 10 10,000 1000 100 1000 MAX667-Fg TOC 3 VIN = +6V 5 10 DD OUTPUT CURRENT (μA) 100 100,000 QUIESCENT CURRENT (μA) MAX667-Fg TOC 1 DROPOUT VOLTAGE (mV) 1000 DD OUTPUT CURRENT vs. INPUT-OUTPUT DIFFERENCE MAX667-Fg TOC 2 DROPOUT VOLTAGE vs. LOAD CURRENT 20 50 100mA LOAD 100 10 1 1 1 10 100 1000 10 0.
PAGE 4
MAX667 +5V/Programmable Low-Dropout Voltage Regulator IN OUT DD SHDN A1 SET LBO C2 C1 1.255V REF LBI +50mV GND MAX667 Figure 1. MAX667 Block Diagram 8 IN OUT 2 C1 10μF 8 +5V OUT 250mA MAX667 IN OUT C1 10μF 7 LBO VREF N MAX667 R3 R2 3 LBI SET GND SHDN 6 4 5 Figure 2. Fixed +5V Regulator 4 VOUT 2 R4 SET SHDN GND 5 4 6 R1 Figure 3.
PAGE 5
+5V/Programmable Low-Dropout Voltage Regulator Dropout Detector The minimum input-output differential, or dropout voltage, determines the regulator’s lowest usable input voltage. In battery-operated systems, this determines the useful end-of-life battery voltage. The MAX667 features very low dropout voltage (see Electrical Characteristics). In addition, the MAX667 has a dropout detector output, DD, that changes as the dropout voltage approaches its limit. DD is an open collector of a PNP transistor.
PAGE 6
MAX667 +5V/Programmable Low-Dropout Voltage Regulator 8 IN OUT 8 2 +5V OUT OUT IN +5V OUT MAX667 R MAX667 C1 10μF 2 R2 1M 10μF 5 SET GND 6 4 SET SHDN SHDN GND DD 4 1 6 R1 332k 5 R3 1M Figure 5. Alternative Stability Scheme Using Resistor R Figure 7. Connection for Minimum Quiescent Current Near Dropout IN OUT 2 VSHDN = 0V +5V OUT QUIESCENT CURRENT (mA) C1 10μF MAX667 DD SET GND SHDN 6 4 5 1 R1 47k MAX667-Fg 8 10 8 C2 0.
PAGE 7
+5V/Programmable Low-Dropout Voltage Regulator TA = +50˚C LOAD CURRENT (mA) 400 CIRCUIT OF FIGURE 6 200 300 GUARANTEED 250mA 200 DIP PACKAGE DISSIPATION LIMIT 100 0 SO PACKAGE DISSIPATION LIMIT 0 1 2 3 4 5 MAX667-Fg 10 MAX667-Fg 9 CIRCUIT OF FIGURE 7 600 IGND (μA) 400 MAX667 800 6 0 VIN (V) 5 10 15 VIN-VOUT (V) Figure 9. Quiescent Current Below Dropout with Connections of Figures 6 and 7 PNP transistor is turned on fully as regulation is lost.
PAGE 8
+5V/Programmable Low-Dropout Voltage Regulator MAX667 ___________________Chip Topography DD +5V OUTPUT 0.1V/div IN OUT 100mA OUTPUT CURRENT 10mA 0.107" (2.71mm) 200μs/div LBI LBO Figure 12. Output Response to 10mA/100mA Load Step with 10μF Output Capacitor (1.5Ω ESR) SET (PSRR) is therefore not specified. Since the output must be connected to a 10µF or larger filter capacitor, the capacitor characteristics dominate the PSRR. Large values of input and output capacitors reduce the ripple.
PAGE 9
+5V/Programmable Low-Dropout Voltage Regulator REVISION NUMBER REVISION DATE 4 9/08 DESCRIPTION Added information for rugged plastic product PAGES CHANGED 1, 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.