MAX1759 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Buck/Boost Regulating Charge Pump in uMAX

19-1600; Rev 0; 1/00
Buck/Boost Regulating
Charge Pump in µMAX
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
o Regulated Output Voltage (Fixed 3.3V or
Adjustable 2.5V to 5.5V)
o 100mA Guaranteed Output Current
o +1.6V to +5.5V Input Voltage Range
o Low 50µA Quiescent Supply Current
o 1µA Shutdown Mode
o Load Disconnected from Input in Shutdown
o High 1.5MHz Operating Frequency
o Uses Small Ceramic Capacitors
o Short-Circuit Protection and Thermal Shutdown
o Small 10-Pin µMAX Package
PART
MAX1759EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit
C_X
IN
+1.6V TO +5.5V
CXN
IN
CXP
OUT
C_IN
MAX1759
ON
OFF
SHDN
POK
FB GND PGND
OUT
3.3V AT 100mA
C_OUT
POWER OK
TOP VIEW
Pin Configuration
POK 1
SHDN 2
IN 3
IN 4
GND 5
MAX1759
µMAX
10 FB
9 OUT
8 CXP
7 CXN
6 PGND
Dual Mode is a trademark of Maxim Integrated Products.
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