MAX866 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters

19-0374; Rev 1; 5/96
EVAALVUAAILTAIOBNLEKIT
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
_______________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 VOUT 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
__________Typical Operating Circuit
____________________________Features
o 0.8V to 6.0V Input Supply Voltage
o 0.9V Guaranteed Start-Up Supply Voltage
o >80% Efficiency Over Wide Load Range
o 100µA No-Load Battery Current (VOUT = 3.3V)
o 1µA Shutdown Mode
o Up to 250kHz Switching Frequency
o ±1.5% Reference Tolerance
o Low-Battery Detector (LBI/LBO)
o Available in Ultra-Small 8-Pin µMAX Package
(1.11mm high)
o Circuit Fits in 0.2in²
______________Ordering Information
PART
MAX866C/D
TEMP. RANGE
0°C to +70°C
MAX866ESA
-40°C to +85°C
MAX866EUA
MAX867C/D
MAX867ESA
MAX867EUA
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
* Dice are tested at TA = +25°C only.
PIN-PACKAGE
Dice*
8 SO
8 µMAX
Dice*
8 SO
8 µMAX
_________________Pin Configurations
INPUT
0.8V TO V_OUT
ON/OFF
3V/5V SELECT
LOW-BATTERY
DETECTOR
INPUT
0.22µF
330µH
SHDN
MAX866
3/5
LX
MBRS0520LTI
OR 1N5817
OUT
OUTPUT
5V OR 3.3V
47µF
LBI
REF _GND
LBO
LOW-BATTERY
DETECTOR OUTPUT
TOP VIEW
SHDN 1
3/5 2
REF 3
LBO ⁴
MAX866
8 _LX
7 GND
6 OUT
5 LBI
SO/µMAX
SHDN 1
FB 2
REF 3
LBO ⁴
MAX867
8 _LX
7 GND
6 OUT
5 LBI
SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
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