19-1499; Rev 0; 7/99
60mA, SOT23 Inverting Charge Pump
with Shutdown
MAX1697
General Description
Features
The MAX1697 ultra-small, monolithic, CMOS charge-
pump voltage inverter accepts an input voltage ranging
from +1.25V to +5.5V. This device features an ultra-low
12Ω output resistance, permitting loads of up to 60mA
with maximum efficiency. The MAX1697 is available
with operating frequencies of 12kHz, 35kHz, 125kHz, or
250kHz, allowing optimization of supply current or
external component size. Its small external components
and micropower shutdown mode make this device
ideal for both battery-powered and board-level voltage
conversion applications.
♦ 60mA Output Current
♦ Low 12Ω Output Resistance
♦ 150µA Supply Current (MAX1697R)
♦ Requires Only Two 1µF Capacitors (MAX1697U)
♦ Start-Up Current Limited
♦ +1.25V to +5.5V Input Voltage Range
♦ 0.1µA Logic-Controlled Shutdown
♦ Slew-Rate Limited to Reduce EMI
♦ 6-Pin SOT23 Package
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. All versions come in a
6-pin SOT23 package and deliver 60mA.
Ordering Information
For applications with lower current requirements, the
MAX1719/MAX1720/MAX1721 are pin-compatible
SOT23 charge pumps that supply up to 25mA.
PART
TEMP. RANGE
PIN-PACKAGE
MAX1697_EUT-T
-40°C to +85°C
6 SOT23-6
Note: The MAX1697 is available with four different operating
frequencies. Choose the desired frequency from the table
below and insert the suffix in the blank above to complete the
part number.
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
PART NO.
SUFFIX
FREQUENCY
(kHz)
TOP
MARK
GaAsFET Bias Supplies
R
S
T
12
35
AABV
AABW
AABX
AABY
Handy-Terminals, PDAs
Battery-Operated Equipment
125
250
U
Pin Configuration
Typical Operating Circuit
1µF
TOP VIEW
C1+
C1-
OUT
NEGATIVE
OUTPUT
INPUT
OUT
IN
1
2
3
C1+
6
5
4
1.5V to 5.5V
IN
-1 · V
IN
60mA
MAX1697
SHDN
GND
MAX1697U
GND
1µF
SHDN
ON
C1-
OFF
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
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