Rainbow Electronics MAX1759 - Manual

General Description
The MAX1759 is a buck/boost regulating charge pump
that generates a regulated output voltage from a single
lithium-ion (Li+) cell, or two or three NiMH or alkaline
cells for small hand-held portable equipment. The
MAX1759 operates over a wide +1.6V to +5.5V input
voltage range and generates a fixed 3.3V or adjustable
(2.5V to 5.5V) output (Dual Mode
™) . Maxim’s unique
charge-pump architecture allows the input voltage to be
higher or lower than the regulated output voltage.
Despite its high 1.5MHz operating frequency, the
MAX1759 maintains low 50µA quiescent supply current.
Designed to be an extremely compact buck/boost con-
verter, this device requires only three small ceramic
capacitors to build a complete DC-DC converter capa-
ble of generating a guaranteed 100mA (min) output
current from a +2.5V input. For added flexibility, the
MAX1759 also includes an open-drain power-OK
(POK) output that signals when the output voltage is in
regulation.
The MAX1759 is available in a space-saving 10-pin
µMAX package that is 1.09mm high and half the size of
an 8-pin SO.
Applications
Li+ Battery-Powered Applications
Miniature Equipment
Backup Battery Boost Converters
Translators
Features
♦ Regulated Output Voltage (Fixed 3.3V or
Adjustable 2.5V to 5.5V)
♦ 100mA Guaranteed Output Current
♦ +1.6V to +5.5V Input Voltage Range
♦ Low 50µA Quiescent Supply Current
♦ 1µA Shutdown Mode
♦ Load Disconnected from Input in Shutdown
♦ High 1.5MHz Operating Frequency
♦ Uses Small Ceramic Capacitors
♦ Short-Circuit Protection and Thermal Shutdown
♦ Small 10-Pin µMAX Package
MAX1759
Buck/Boost Regulating
Charge Pump in µMAX
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
FB
OUT
CXP
CXN IN
IN
SHDN
POK
MAX1759
µMAX
TOP VIEW
PGND GND
C X
IN
+1.6V TO +5.5V
OUT
3.3V AT 100mA
C IN
ON
OFF
C OUT
POWER OK
OUT
POK
IN
CXN CXP
PGND GND FB
SHDN
MAX1759
Typical Operating Circuit
19-1600; Rev 1; 6/00
PART
MAX1759EUB -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
Pin Configuration
Ordering Information
Dual Mode is a trademark of Maxim Integrated Products.
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.