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_______________General Description

The MAX866 and MAX867 are ultra-small, high-efficiency,

CMOS, step-up, DC-DC switching regulators for 1-cell

battery-powered systems. The MAX866 accepts a posi-

tive input voltage between 0.8V and V

OUT

and converts it

to a higher, pin-selectable output voltage of 3.3V or 5V.

The MAX867 adjustable version accepts 0.8V to 6.0V

input voltages and generates a higher adjustable output

voltage in the 2.7V to 6.0V range. Typical efficiencies are

greater than 80%. Typical no-load supply current is

100µA (1µA in shutdown).

The MAX866/MAX867 combine ultra-low quiescent sup-

ply current and high efficiency to give maximum battery

life. Its high switching frequency permits the use of

small, low-cost inductors and capacitors. Additionally,

internal peak-current limiting protects the IC.

________________________Applications

Pagers

Remote Controls

Detectors

1-Cell Battery-Operated Equipment

Backup Supplies

____________________________Features

♦ 0.8V to 6.0V Input Supply Voltage

♦ 0.9V Guaranteed Start-Up Supply Voltage

♦ >80% Efficiency Over Wide Load Range

♦ 100µA No-Load Battery Current (V

OUT

= 3.3V)

♦ 1µA Shutdown Mode

♦ Up to 250kHz Switching Frequency

♦ ±1.5% Reference Tolerance

♦ Low-Battery Detector (LBI/LBO)

♦ Available in Ultra-Small 8-Pin µMAX Package

(1.11mm high)

♦ Circuit Fits in 0.2in

______________Ordering Information

MAX866/MAX867

3.3V/5V or Adjustable-Output,

Single-Cell DC-DC Converters

________________________________________________________________

Maxim Integrated Products

GND

OUT

LBI

LBO

REF

3/5

SHDN

MAX866

SO/µMAX

TOP VIEW

GND

OUT

LBI

LBO

REF

SHDN

MAX867

SO/µMAX

_________________Pin Configurations

MAX866

SHDN

3/5

REF

GND

OUT

INPUT

0.8V TO V

OUT

MBRS0520LTI

OR 1N5817

OUTPUT

5V OR 3.3V

LBO

47µF

0.22µF

330µH

LOW-BATTERY

DETECTOR OUTPUT

ON/OFF

3V/5V SELECT

LBI

LOW-BATTERY

DETECTOR

INPUT

__________Typical Operating Circuit

19-0374; Rev 1; 5/96

PART TEMP. RANGE PIN-PACKAGE

MAX866C/D

0°C to +70°C Dice*

MAX866ESA -40°C to +85°C 8 SO

MAX867C/D

0°C to +70°C Dice*

MAX867ESA -40°C to +85°C 8 SO

* Dice are tested at T

= +25°C only.

EVALUATION KIT

AVAILABLE

MAX866EUA -40°C to +85°C 8 µMAX

MAX867EUA -40°C to +85°C 8 µMAX

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

Summary of content (12 pages)

PAGE 1
9-0374; Rev 1; 5/96 KIT ATION EVALU BLE A IL A V A 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters ____________________________Features ♦ 0.8V to 6.0V Input Supply Voltage ♦ 0.9V Guaranteed Start-Up Supply Voltage ♦ >80% Efficiency Over Wide Load Range ♦ 100µA No-Load Battery Current (VOUT = 3.3V) ♦ 1µA Shutdown Mode ♦ Up to 250kHz Switching Frequency ♦ ±1.5% Reference Tolerance ♦ Low-Battery Detector (LBI/LBO) ♦ Available in Ultra-Small 8-Pin µMAX Package (1.11mm high) ♦ Circuit Fits in 0.
PAGE 2
MAX866/MAX867 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) ...................................-0.3V, +7V Switch Voltage (LX to GND) .......................................-0.3V, +7V ———– SHDN , LBO to GND ....................................................-0.3V, +7V –– LBI, REF, 3/ 5, FB to GND ............................-0.3V, (VOUT + 0.3V) Reference Current (IREF) ..................................................2.
PAGE 3
.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters MAX866/MAX867 ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 2, VIN = 1.2V, ILOAD = 0mA, TA = +25°C, unless otherwise noted.
PAGE 4
____________________________Typical Operating Characteristics (continued) (Circuits of Figure 2, TA = +25°C, unless otherwise noted.) START-UP INPUT VOLTAGE vs. LOAD CURRENT (VOUT = 5V) 47µH 1.2 100µH 1.1 1.0 0.9 0.8 220µH 0.7 330µH 0.6 1.4 100µH 2.5 1.3 1.2 47µH 1.1 1.0 0.9 100µH 0.8 0.7 330µH 220µH 1mH 330µH 2.0 1.5 22µH 1.0 0.5 0.5 0.5 10 1 0 0.1 100 1 10 100 INPUT VOLTAGE (V) 330µH 1.5 47µH 1.0 22µH 0.5 MAX866/67-11 10 9 VREF LOAD REGULATION (mV) 100µH 2.
PAGE 5
3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters MAX866 LOAD-TRANSIENT RESPONSE (3.3V MODE) MAX866 LOAD-TRANSIENT RESPONSE (5V MODE) A A B B 1ms/div A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div (TEKTRONIX P6042 CURRENT PROBE) ILOAD = 5mA, COUT = 47µF, VIN = 1.25V 1ms/div A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div (TEKTRONIX P6042 CURRENT PROBE) ILOAD = 5mA, COUT = 47µF, VIN = 1.
PAGE 6
____________________________Typical Operating Characteristics (continued) (Circuits of Figure 2, TA = +25°C, unless otherwise noted.) 20 VIN = 0.9V 15 3.3V MODE 10 -60 -40 -20 0 20 40 60 TEMPERATURE (°C) 80 100 26 IOUT 24 MAX866/67-29 VOUT = 3.47V 28 REFERENCE VOLTAGE (V) 25 30 1.255 MAX866/67-28 VIN = 1.2V QUIESCENT SUPPLY CURRENT (µA) MAX866/67-27 30 REFERENCE VOLTAGE vs. TEMPERATURE QUIESCENT SUPPLY CURRENT vs. TEMPERATURE OUTPUT CURRENT CAPABILITY vs.
PAGE 7
3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters MAX866/MAX867 MINIMUM OFF-TIME ONE-SHOT VBATT TRIG Q ONE-SHOT SHDN LX VOUT F/F S N Q R 3/5* MAXIMUM ON-TIME ONE-SHOT GND Q TRIG ONE-SHOT CURRENT-LIMIT COMPARATOR OUT MAX866/MAX867 ** * FB** ** * ERROR COMPARATOR LBO REF N LBI COMPARATOR LBI REFERENCE *MAX866 ONLY **MAX867 ONLY Figure 1.
PAGE 8
MAX866/MAX867 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters Voltage Reference The precision voltage reference is suitable for driving external loads, such as an analog-to-digital converter. The voltage-reference output changes less than ±2% when sourcing up to 250µA and sinking up to 20µA. If the reference drives an external load, bypass it with 0.22µF to GND. If the reference is unloaded, bypass it with at least 0.1µF.
PAGE 9
3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters FOR VTH < 1.25V VIN OUT Q1 MMDFZP02E VOUT (3.3V/5V) 6 R9 1M R5 MAX866 MAX866 LBI R3 LBI VIN MAX866 5 LBO R10 1M R7 R6 Q2 2N3904 5 OUT 6 LBI R11 1M 4 5 R4 MAX866/MAX867 FOR VTH > 1.25V (1.25V) R8 1M ( ) VTH -1 VREF WHERE VTH = THE VIN TRIP THRESHOLD R3 = R4 ( LOAD ) VREF - VTH VOUT - VREF WHERE VTH = THE VIN TRIP THRESHOLD R5 = R6 Figure 3. Low-Battery Detector Circuits Figure 4.
PAGE 10
MAX866/MAX867 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters Table 1.
PAGE 11
3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters MAX866/MAX867 Table 2. Surface-Mount Inductor Information INDUCTANCE (mH) RESISTANCE (W) RATED CURRENT (A) HEIGHT (mm) Sumida CD73-331 330 1.5 0.28 3.5 Sumida CD104-331 330 1.1 0.42 4 Murata-Erie LQH4N331K04M00** 330 8.2 0.095 2.6 TDK NLC565050T-331K** 330 4.9 0.14 5 Coilcraft D01608-334 330 2.9 0.16 3.2 Coilcraft DT1608-334 330* 2.9 0.16 3.2 Coilcraft D03316-334 330 0.7 0.6 5.4 Coilcraft DT3316-334 330* 0.
PAGE 12
MAX866/MAX867 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters ________________________________________________________Package Information DIM C α A 0.101mm 0.004 in e B A1 E L A A1 B C D E e H L α INCHES MAX MIN 0.044 0.036 0.008 0.004 0.014 0.010 0.007 0.005 0.120 0.116 0.120 0.116 0.0256 0.198 0.188 0.026 0.016 6° 0° MILLIMETERS MIN MAX 0.91 1.11 0.10 0.20 0.25 0.36 0.13 0.18 2.95 3.05 2.95 3.05 0.65 4.78 5.03 0.41 0.