MAX1852 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – SC70 Inverting Charge Pumps with Shutdown

19-1792; Rev 0; 9/00
SC70 Inverting Charge Pumps
with Shutdown
General Description
The MAX1852/MAX1853 monolithic, CMOS charge-
pump voltage inverters in the ultra-small SC70 package
feature a low 15Ω output resistance, permitting loads
up to 30mA with maximum efficiency. The MAX1852/
MAX1853 are available with operating frequencies of
50kHz and 200kHz, respectively, allowing optimization
of supply current or external component size. Small
external components and micropower shutdown mode
make these devices ideal for both battery-powered and
board-level voltage conversion applications.
Oscillator control circuitry and four power-MOSFET
switches are included on-chip. Applications include
generating a negative supply from a +5V or +3.3V logic
supply to power analog circuitry. Both versions come in
a 6-pin SC70 package that is 40% smaller than a
SOT23.
Features
o 30mA Output Current
o Low 15Ω Output Resistance
o 68µA Supply Current (MAX1852)
o Requires Only Two 0.68µF Capacitors (MAX1853)
o +2.5V to +5.5V Input Voltage Range
o 0.1µA Logic-Controlled Shutdown
o Two Switching Frequencies
50kHz (MAX1852)
200kHz (MAX1853)
o Slew-Rate Limited to Reduce EMI
o Ultra-Small 6-Pin SC70 Package
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
GaAsFET Bias Supplies
Handy-Terminals, PDAs
Battery-Operated Equipment
PART
MAX1852EXT
MAX1853EXT
Ordering Information
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PIN -
PA C K A G E
6 SC70
6 SC70
TOP
MARK
AAL
AAM
Typical Operating Circuit
0.68µF
INPUT
2.5V TO 5.5V
C1+
IN
C1-
OUT
MAX1853
ON
SHDN
OFF
GND
NEGATIVE
OUTPUT
-1 ✕ V_IN
30mA
0.68µF
Pin Configuration
TOP VIEW
OUT 1
6 C1+
MAX1852
GND 2 _MAX1853 5 C1-
SHDN 3
4 IN
SC70-6
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