19-1499; Rev 3; 12/08
60mA, SOT23 Inverting Charge Pump
with Shutdown
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
♦ Slew-Rate Limited to Reduce EMI
Ordering Information
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.
PART
TEMP RANGE
PIN-PACKAGE
MAX1697_EUT-T
6 SOT23
-40°C to +85°C
Note 1: The MAX1697 requires special solder temperature pro-
file described in the Absolute Maximum Ratings section.
For applications with lower current requirements, the
MAX1719/MAX1720/MAX1721 are pin-compatible
SOT23 charge pumps that supply up to 25mA.
Note 2: 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
TOP MARK
+T
PART NO.
SUFFIX
FREQUENCY
(kHz)
-T
#T
R
S
T
12
35
AABV
AABW
AABX
AABY
AABV
ACBT
ACCK
ACCL
ACCM
Small LCD Panels
AABW
AABX
GaAsFET Bias Supplies
125
250
Handy-Terminals, PDAs
U
AABY
Battery-Operated Equipment
Note 3: MAX1697 is available in different package material.
Add the following suffix to the part number when ordering:
-T = Denotes a package containing lead(Pb).
+T = Denotes a lead(Pb)-free/RoHS-compliant package.
#T = Denotes an RoHS-compliant device that may include
lead(Pb) that is exempt under the RoHS requirements.
Pin Configuration
Typical Operating Circuit
TOP VIEW
+
1μF
OUT
1
2
3
C1+
6
5
4
C1+
C1-
OUT
NEGATIVE
OUTPUT
✕
INPUT
1.5V to 5.5V
MAX1697
SHDN
GND
IN
IN
-1
V
IN
60mA
MAX1697U
C1-
1μF
SHDN
ON
SOT23
OFF
GND
Note 4: Leaded and lead-free top marks are identical. Per
Maxim guideline, the pin 1 indicator for leaded package is
a ‘•’ and the lead-free package is a ‘+’.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.