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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降壓型轉換器 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 234K |
| 代理商： | MAX1684 |
M
Low-Noise, 14V Input, 1A, PWM
S tep-Down Converters
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
IN
= V
SHDN
= +6V,
STBY
= SYNC/PWM = CVL, V
BOOT
= V
OUT
, FB = AGND, circuit of Figure 1,
T
A
= -40°C to +85°C
, unless other-
wise noted.) (Note 5)
Note 1:
The output adjust range with BOOT connected to V
OUT
is V
REF
to 5.5V. Connect BOOT to AGND for V
OUT
> 5.5V.
Note 2:
The quiescent power-consumption specifications include chip supply and gate-drive loss only. Divide these values by V
IN
(= 6V) to obtain quiescent currents. In normal and low-power modes, chip supply current dominates and quiescent power
is proportional to V
BOOT
(BOOT connected to OUT). In PWM mode, gate-drive loss dominates and quiescent power is pro-
portional to V
IN
·
(V
IN
- V
CVH
). In addition, IR losses in power switches and external components typically increase PWM
quiescent power consumption by 5mW to 10mW. Note that if the device is not bootstrapped, additional power will be dissi-
pated in the CVL linear regulator.
Note 3:
When the duty factor (V
OUT
/ V
IN
) is less than this value, the switching frequency decreases in PWM mode to maintain regu-
lation.
Note 4:
Thermal shutdown is disabled in low-power mode (
STBY
= low) to reduce power consumption.
Note 5:
Specifications to -40°C are guaranteed by design, not production tested.
CVL Undervoltage Lockout
Threshold
2.4
2.6
V
BOOT = AGND, CVL falling edge,
typical hysteresis is 40mV
Logic Input Low Voltage
V
IL
0.7
Logic Input High Voltage
V
IH
2
V
SHDN
,
STBY
, SYNC/PWM
ILIM/SS Source Current
3.1
4.7
μA
V
ILIM/SS
= 1.4V
0.27
Normal mode, SYNC/PWM = low,
V
BOOT
= 3.3V (Note 2)
BOOT Switchover Threshold
2.4
2.6
V
BOOT falling edge, typical hysteresis is 0.1V
CVH with Respect to V
IN
-5.0
-4.1
V
I
CVH
= -1mA
CVL Regulator Output Voltage
2.7
3.15
V
V
IN
= 3V to 14V, BOOT = AGND,
I
CVL
= 0 to 5mA
Reference Output Voltage
1.236
1.266
V
I
REF
= 0
Oscillator Frequency
f
OSC
480
700
kHz
MAX1685
240
350
MAX1684
Shutdown Supply Current
6
μA
SHDN
= low
Quiescent Power Consumption
2
mW
Current Limit in Low-Power
Mode
I
LIMLP
285
475
mA
STBY
= low
Output Voltage (3.3V mode)
Output Current Capability
V
OUT
3.295
1
3.375
V
A
PARAMETER
SYMBOL
MIN
2.7
1.236
MAX
14
1.266
UNITS
V
V
FB Input Current
Current Limit in PWM Mode
I
FB
I
LIM
-50
1.2
50
2.3
nA
A
Output Adjust Range
V
REF
V
IN
V
Input Voltage Range
Output Feedback Voltage
V
FB
CONDITIONS
V
FB
= 1.4V
BOOT = AGND (Note 1)
V
IN
= 6V to 14V
FB = AGND, I
LOAD
= = 0 to 1A
V
FB
= V
OUT
, I
LOAD
= 0 to 1A
Low-power mode,
STBY
= low,
V
BOOT
= 3.3V (Note 2)
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