Rainbow Electronics MAX1853 - Manual

General Description
The MAX1852/MAX1853 monolithic, CMOS charge-
pump voltage inverters in the ultra-small SC70 package
feature a low 15
Ω 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.
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
GaAsFET Bias Supplies
Handy-Terminals, PDAs
Battery-Operated Equipment
Features
♦ 30mA Output Current
♦ Low 15Ω Output Resistance
♦ 68µA Supply Current (MAX1852)
♦ Requires Only Two 0.68µF Capacitors (MAX1853)
♦ +2.5V to +5.5V Input Voltage Range
♦ 0.1µA Logic-Controlled Shutdown
♦ Two Switching Frequencies
50kHz (MAX1852)
200kHz (MAX1853)
♦ Slew-Rate Limited to Reduce EMI
♦ Ultra-Small 6-Pin SC70 Package
MAX1852/MAX1853
SC70 Inverting Charge Pumps
with Shutdown
________________________________________________________________ Maxim Integrated Products 1
5
TOP VIEW
GND C1-
IN
C1+ OUT
SC70-6
1 6
MAX1852
MAX1853
2
3 4 SHDN
Pin Configuration
C1+ C1-
IN
SHDN
OUT
GND
ON
0.68 µF
0.68 µF
OFF
INPUT
2.5V TO 5.5V
NEGATIVE
OUTPUT
-1
✕ V IN
30mA
MAX1853
Typical Operating Circuit
19-1792; Rev 0; 9/00
Ordering Information
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
PART
TEMP.
RANGE
PIN -
PA C K A G E TOP
MARK
MAX1852EXT - 40 °C to + 85°C 6 SC70 AAL
MAX1853EXT - 40 °C to + 85°C 6 SC70 AAM