Rainbow Electronics MAX1697 - Manual

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
12
Ω 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
♦ 0.1µA Logic-Controlled Shutdown
♦ Slew-Rate Limited to Reduce EMI
♦ 6-Pin SOT23 Package
MAX1697
60mA, SOT23 Inverting Charge Pump
with Shutdown
________________________________________________________________ Maxim Integrated Products 1
SHDN 5
TOP VIEW
IN
GND C1-
C1+ OUT
SOT23-6
1 6
MAX1697
2
3 4
Pin Configuration
C1+ C1-
IN
SHDN
OUT
GND
ON
1 µF
1 µF
OFF
INPUT
1.5V to 5.5V
NEGATIVE
OUTPUT
-1
✕ V IN
60mA
MAX1697U
Typical Operating Circuit
19-1499; Rev 1; 11/00
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 NO.
SUFFIX
R 12
FREQUENCY
(kHz)
TOP
MARK
AABV
S 35 AABW
T
U 250 AABY
125 AABX
Note 1: The MAX1697 requires special solder temperature
profile 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 SOT23-6