Rainbow Electronics MAX889 - Manual

General Description
The MAX889 inverting charge pump delivers a regulated
negative output voltage at loads of up to 200mA. The
device operates with inputs from 2.7V to 5.5V to produce
an adjustable, regulated output from -2.5V to -V
IN .
The MAX889 is available with an operating frequency of
2MHz (T version), 1MHz (S version), or 0.5MHz (R ver-
sion). The higher switching frequency devices allow the
use of smaller capacitors for space-limited applica-
tions. The lower frequency devices have lower quies-
cent current.
The MAX889 also features a 0.1µA logic-controlled
shutdown mode and is available in an 8-pin SO pack-
age. An evaluation kit, MAX889SEVKIT, is available.
________________________Applications
TFT Panels
Hard Disk Drives
Camcorders
Digital Cameras
Measurement Instruments
Battery-Powered Applications
Features
♦ 200mA Output Current
♦ Up to 2MHz Switching Frequency
♦ Small Capacitors (1µF)
♦ +2.7V to +5.5V Input Voltage Range
♦ Adjustable Regulated Negative Output
(-2.5V to -V IN )
♦ 0.1µA Logic-Controlled Shutdown
♦ Low 0.05Ω Output Resistance (in regulation)
♦ Soft-Start and Foldback Current Limited
♦ Short-Circuit and Thermal Shutdown Protected
♦ 8-Pin SO Package
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
________________________________________________________________ Maxim Integrated Products 1
SHDN
OUT CAP-
1
2
8
7
AGND
FB CAP+
GND
IN
SO
TOP VIEW
3
4
6
5
MAX889
Pin Configuration
MAX889
IN
INPUT +2.7V TO +5.5V
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 × V
IN ,
UP TO 200mA)
FB
OUT
GND AGND
CAP+
ON
OFF
SHDN
CAP-
Typical Operating Circuit
19-1774; Rev 0; 7/00
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.
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
SWITCHING
FREQUENCY
MAX889TESA -40 °C to +85°C 8 SO 2MHz
MAX889SESA -40 °C to +85°C 8 SO 1MHz
MAX889RESA -40 °C to +85°C 8 SO 0.5MHz
EVALUATION KIT
AVAILABLE