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MAX1684 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX1684
Description  Low-Noise, 14V Input, 1A, PWM Step-Down Converters
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1684 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
1.0
1.2
1.1
1.4
1.3
1.7
1.6
1.5
1.8
04
2
6
8
101214
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
PWM OR NORMAL MODE
0
200
600
400
1,000
1,200
800
1,400
06
2
8
10
12
14
16
SAFE OPERATING AREA
INPUT VOLTAGE (V)
VOUT = 3.3V
4
0
100
300
200
400
0
200
400
600
800
1,000
DROPOUT VOLTAGE vs. LOAD CURRENT
LOAD CURRENT (mA)
VOUT = 3.3V
VOUT = 5V
INDUCTOR RESISTANCE INCLUDED
0
100
50
200
150
250
300
4
678
5
9
10 11 12 13 14 15
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (VOUT = 3.3V)
INPUT VOLTAGE (V)
NORMAL MODE
LOW-POWER MODE
SCHOTTKY LEAKAGE
CURRENT INCLUDED
ILOAD
500mA/div
VOUT
50mV/div
2ms/div
LOAD-TRANSIENT RESPONSE
MAX1684/85-16
MAX1684, ILOAD = 0.1mA TO 1A, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V
2.0
2.5
3.0
3.5
4.0
4.5
5.0
46
5
7
8
9
10
11
12
MAX1684
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(VOUT = 3.3V, PWM MODE)
INPUT VOLTAGE (V)
2.7
8
7
6
10
9
14
13
12
11
15
02468
10
12
14
PWM FIXED-FREQUENCY
OPERATION AREA
OUTPUT VOLTAGE (V)
MAX1685
MAX1684
VOUT
20mV/div
ILX
100mA/div
1
µs/div
SWITCHING WAVEFORM
MAX1684/85-17
MAX1684, ILOAD = 100mA, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V
VLX
5V/div
ILX
100mA/div
1
µs/div
SWITCHING WAVEFORM
MAX1684/85-18
MAX1684, ILOAD = 100mA, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V


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