MAX1606 Maxim, MAX1606 Datasheet - Page 6

• Manufacturer Part Number: MAX1606
• Description: 28V Internal Switch LCD Bias Supply with True Shutdown
• Manufacturer: Maxim

28V Internal Switch LCD Bias Supply
with True Shutdown
(V
6
18.1V
17.9V
18V
CC
6V
4V
2V
_______________________________________________________________________________________
= 3.3V, V
A: V
B: V
PIN
1
2
3
4
5
6
7
8
BATT
OUT
= 18V, R
= V
CC
BATT
LINE TRANSIENT
= 2.4V TO 5.5V, 2V/div
OUT
= 3.6kΩ, 100mV/div
100µs/div
= 3.6V, L1 = 10µH, SHDN = LIM = V
NAME
SHDN
BATT
GND
V
LIM
SW
FB
LX
CC
MAX1606 toc13
Inductor Supply Voltage, 0.8V to 5.5V. Internally connected to the source of a P-channel
MOSFET used to isolate the output from the input during shutdown. Bypass with a 10µF or
greater capacitor.
Feedback Input. Connect to a resistive divider network between the output and GND to set the
output voltage between V
IC Supply Voltage, 2.4V to 5.5V. Bypass V
Ground
Inductor Switching Connection. Internally connected to the drain of a 28V N-channel MOSFET.
LX is high impedance in shutdown.
Inductor Current-Limit Selection. Connect LIM to V
or connect LIM to GND for 125mA.
Active-Low Shutdown Input. A logic low shuts down the device and reduces the supply current
to 0.1µA. When shutdown, the MAX1606 isolates the output from the input by turning off the P-
channel MOSFET between BATT and SW. Connect SHDN to V
Isolation Switch Output, Inductor Connection. Internally connected to the drain of a P-channel
MOSFET used to isolate the output from the input during shutdown.
A
B
500mA
10mA
18.1V
17.9V
18V
Typical Operating Characteristics (continued)
0
0
A: I
B: V
C: I
OUT
L1
OUT
, 500mA/div
= 1mA TO 10mA, 10mA/div
CC
= 18V, 100mV/div
, V
LOAD TRANSIENT
BATT
OUT(NOM)
40µs/div
and 28V. The feedback threshold is 1.25V.
= 18V (Figure 3), T
CC
MAX1606 toc14
FUNCTION
to GND with a 1µF or greater capacitor.
A
B
C
CC
for 500mA, leave LIM floating for 250mA,
A
500mA
= +25°C, unless otherwise noted.)
20V
10V
4V
2V
0
0
0
A: V
B: V
C: I
CC
L1
SHDN
OUT
, 500mA/div
for normal operation.
, 10V/div, R
, 2V/div
SHUTDOWN WAVEFORM
Pin Description
OUT
400µs/div
= 1.8kΩ
MAX1606 toc15
A
B
C