60mA, SOT23 Inverting Charge Pump with Shutdown
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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.
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
GaAsFET Bias Supplies
Handy-Terminals, PDAs
Battery-Operated Equipment
Features
♦♦
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
MAX1697
60mA, SOT23 Inverting Charge Pump
with Shutdown
________________________________________________________________ Maxim Integrated Products 1
SHDN
5
TOP VIEW
IN
GND
C1-
C1+
OUT
SOT23
1
6
MAX1697
2
3
4
+
Pin Configuration
C1+ C1-
IN
SHDN
OUT
GND
ON
1μF
1μF
OFF
INPUT
1.5V to 5.5V
NEGATIVE
OUTPUT
-1
✕
V
IN
60mA
MAX1697U
Typical Operating Circuit
19-1499; Rev 3; 12/08
Note 1: The MAX1697 requires special solder temperature pro-
file described in the Absolute Maximum Ratings section.
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX1697_EUT-T
-40°C to +85°C
6 SOT23
TOP MARK
PART NO.
SUFFIX
FREQUENCY
(kHz)
-T +T #T
R 12 AABV AABV ACBT
S 35 AABW AABW ACCK
T 125 AABX AABX ACCL
U 250 AABY AABY ACCM
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.
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 ‘+’.
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.
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