Rainbow Electronics MAX881R - Manual (Page 5)

MAX881R
Low-Noise Bias Supply in µMAX
with Power-OK for GaAsFET PA
_______________________________________________________________________________________ 5
CHARGE PUMP
NEGOUT
SHDN
0.5V 0.4625V
GND
C1+
C1
C2
C4
C3
IN
OUT
FB
POK
C1-
MAX881R
Pin Description
Ground GND 8
No Connection. Not internally connected. N.C. 9
Positive Power-Supply Input IN 10
Active-Low, Logic-Level Shutdown Input. Connect to IN for normal operation. Do not leave this pin
unconnected.
SHDN 5
Dual-Mode™ Feedback Input. When FB is connected to GND, the output is preset to -2V. To select
other voltages, connect FB to an external resistor-divider (Figure 4). Do not leave this pin
unconnected.
FB 6
Regulated Negative Output Voltage OUT 7
Active-Low, Open-Drain Power-OK Output. Goes low when OUT reaches 92.5% of its set value. POK 4
Negative Output Voltage (unregulated) NEGOUT 3
PIN
Negative Terminal for C1 C1- 2
Positive Terminal for C1 C1+ 1
FUNCTION NAME
Figure 1. Functional Diagram
Dual-Mode is a trademark of Maxim Integrated Products.