Rainbow Electronics MAX867 - Manual

_______________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 2
______________Ordering Information
MAX866/MAX867
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI LBO
REF
3/5
SHDN
MAX866
SO/µMAX
TOP VIEW
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI LBO
REF
FB
SHDN
MAX867
SO/µMAX
_________________Pin Configurations
MAX866
SHDN
3/5
REF
LX
GND
OUT
INPUT
0.8V TO V OUT
MBRS0520LTI
OR 1N5817
OUTPUT
5V OR 3.3V
LBO
47 µ F
0.22 µ F
330 µ H
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
MAX866 C/D 0°C to +70°C Dice*
MAX866ESA -40°C to +85°C 8 SO
MAX867 C/D 0°C to +70°C Dice*
MAX867ESA -40°C to +85°C 8 SO
* Dice are tested at T A = +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