MAX889 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – High-Frequency, Regulated, 200mA, Inverting Charge Pump

19-1774; Rev 0; 7/00
EVAALVUAAILTAIOBNLEKIT
High-Frequency, Regulated,
200mA, Inverting Charge Pump
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.
Features
o 200mA Output Current
o Up to 2MHz Switching Frequency
o Small Capacitors (1µF)
o +2.7V to +5.5V Input Voltage Range
o Adjustable Regulated Negative Output
(-2.5V to -V_IN)
o 0.1µA Logic-Controlled Shutdown
o Low 0.05Ω Output Resistance (in regulation)
o Soft-Start and Foldback Current Limited
o Short-Circuit and Thermal Shutdown Protected
o 8-Pin SO Package
________________________Applications
TFT Panels
Hard Disk Drives
Camcorders
Digital Cameras
Measurement Instruments
Battery-Powered Applications
Ordering Information
PART
MAX889TESA
MAX889SESA
MAX889RESA
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN- SWITCHING
PACKAGE FREQUENCY
8 SO
8 SO
8 SO
2MHz
1MHz
0.5MHz
Typical Operating Circuit
INPUT +2.7V TO +5.5V
ON
OFF
SHDN ^IN
FB
CAP+ _MAX889
OUT
CAP-
AGND GND
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 × V_IN,
UP TO 200mA)
TOP VIEW
Pin Configuration
IN 1
CAP+ 2
GND 3
CAP- 4
MAX889
8 AGND
7 FB
6 SHDN
5 OUT
SO
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