19-1499; Rev 0; 7/99
60mA, SOT23 Inverting Charge Pump
with Shutdown
General Description
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.
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.
For applications with lower current requirements, the
MAX1719/MAX1720/MAX1721 are pin-compatible
SOT23 charge pumps that supply up to 25mA.
♦
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
Features
MAX1697
Ordering Information
PART
MAX1697_EUT-T
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
GaAsFET Bias Supplies
Handy-Terminals, PDAs
Battery-Operated Equipment
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.
PART NO.
SUFFIX
R
S
T
U
FREQUENCY
(kHz)
12
35
125
250
TOP
MARK
AABV
AABW
AABX
AABY
Typical Operating Circuit
1µF
Pin Configuration
TOP VIEW
INPUT
1.5V to 5.5V
C1+
IN
C1-
OUT
NEGATIVE
OUTPUT
-1
·
V
IN
60mA
1µF
C1-
GND
3
4
GND
OUT
1
6
C1+
MAX1697U
ON
OFF
SHDN
IN
2
MAX1697
5
SHDN
SOT23-6
________________________________________________________________
Maxim Integrated Products
1
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For small orders, phone 1-800-835-8769.
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