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參數(shù)資料
| 型號： | MAX1684 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Noise, 14V Input, 1A, PWM Step-Down Converters |
| 中文描述： | 低噪聲、14V輸入、1A、PWM降壓型轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 234K |
| 代理商： | MAX1684 |
M
Low-Noise, 14V Input, 1A, PWM
S tep-Down Converters
_______________________________________________________________________________________
7
Pin Desc ription
Typic al Operating Charac teristic s (c ontinued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
V
IN
5V/div
0V
V
OUT
100mV/div
2ms/div
LINE-TRANSIENT RESPONSE
MAX1684, I
LOAD
= 100mA, V
IN
= 5V TO10V,
SYNC/PWM = 3.3V
V
SHDN
5V/div
I
IN
50mA/div
10ms/div
START-UP CURRENT
MAX1684/85-20
MAX1684, I
LOAD
= 100mA, V
= 3.3V,
V
IN
= 5V, C
ILIM/SS
= 0.1
μ
F, SYNC/PWM = 3.3V
PIN
High-Side MOSFET Gate Bias. Bias voltage for P-channel switch. Bypass to IN with a 0.1μF capacitor.
Analog Supply Voltage Input. Connect to IN with a 0.2 in. metal trace. Bypass to PGND with a 0.1μF
capacitor.
Supply Voltage Input
CVH
1
FUNCTION
NAME
AIN
2
Logic Supply Voltage Output and IC Logic Supply. Sources 5mA for external loads. Bypass to AGND
with 1μF capacitor.
Analog Ground
CVL
4
IN
3
Reference Output. 1.25V reference output supplies 10μA for external loads. Bypass to AGND with 0.1μF
capacitor.
REF
6
Integrator Capacitor Connection. Connect a 0.01μF capacitor to AGND.
CC
8
Dual Mode Feedback Input. Connect FB to V
OUT
for 1.25V output. Connect to an external resistor divider
to adjust the output voltage. Connect to AGND to set output voltage to 3.3V.
FB
7
AGND
5
Current-Limit Adjust/Soft-Start Input. See Current Limit and Soft-Startsection.
Standby Control Input. Connect to CVL for normal operation. Connect to AGND for low-power mode
(Table 1). This pin overrides SYNC/PWM setting.
ILIM/SS
10
Bootstrap Input. Connection for the bootstrap switch and internal feedback path. Connect BOOT to V
OUT
for V
OUT
< 5.5V. Connect BOOT to AGND for V
OUT
> 5.5V.
Inductor Connection. Drain for internal P-channel MOSFETs. Connect inductor from LX to OUT.
BOOT
12
STBY
11
Active-Low Shutdown Input. Connect to ground for shutdown.
SHDN
can withstand the input voltage.
Power Ground
SHDN
PGND
15
16
LX
13, 14
SYNC/PWM Input:
For synchronized-PWM operation, drive with TTL level, 50% square wave.
Connect to CVL for PWM mode.
Connect to AGND for normal mode.
SYNC/PWM
9
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