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參數(shù)資料
| 型號： | MAX1605 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 30V Internal Switch LCD Bias Supply |
| 中文描述： | 內置30V開關的LCD偏置電源 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 347K |
| 代理商： | MAX1605 |
M
30V Internal Switch LCD Bias Supply
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
SHDN
Active-Low Shutdown Input. A logic low shuts down the device and reduces the supply current
to 0.1μA. Connect
SHDN
to V
CC
for normal operation.
2
V
CC
IC Supply Voltage (+2.4V to +5.5V). Bypass V
CC
to GND with a 0.1μF or greater capacitor.
3
GND
Ground
4
LX
Inductor Connection. The drain of an internal 30V N-channel MOSFET. LX is high impedance in
shutdown.
5
LIM
Inductor Current Limit Selection. Connect LIM to V
CC
for 500mA, leave LIM floating for 250mA,
or connect LIM to GND for 125mA.
6
FB
Feedback Input. Connect to a resistive-divider network between the output (V
OUT
) and FB to set
the output voltage between V
IN
and 30V. The feedback threshold is 1.25V.
Detailed Description
The MAX1605 compact, step-up DC-DC converter oper-
ates from a +2.4V to +5.5V supply. Consuming only
18μA of supply current, the device includes an internal
switching MOSFET with 1
on-resistance and selectable
current limit (Figure 1). During startup, the MAX1605
extends the minimum off-time, limiting initial surge cur-
rent. The MAX1605 also features a shutdown mode.
Control Scheme
The MAX1605 features a minimum off-time, current-lim-
ited control scheme. The duty cycle is governed by a
pair of one-shots that set a minimum off-time and a
maximum on-time. The switching frequency can be up
to 500kHz and depends upon the load and input volt-
age. The peak current limit of the internal N-channel
MOSFET is pin selectable and may be set at 125mA,
250mA, or 500mA (Figure 2).
SHDN
ON
OFF
V
CC
= 2.4V TO 5.5V
V
OUT
= V
IN
TO 30V
CONTROL
LOGIC
ERROR
AMPLIFIER
1.25V
GND
FB
R2
V
CC
LX
N
C
OUT
L1
10
μ
H
R1
LIM
V
IN
= 0.8V TO V
OUT
C
FF
SHUTDOWN
LOGIC
CURRENT
LIMIT
MAX1605
Figure 1. Functional Diagram
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