MAX1957EUB+ Maxim Integrated Products, MAX1957EUB+ Datasheet - Page 5

• Manufacturer Part Number: MAX1957EUB+
• Description: IC CNTRLR PWM BUCK 10-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1957EUB+

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.4 ~ 4.73 V
• Current - Output: 3A
• Frequency - Switching: 300kHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Power - Output: 444mW
• Duty Cycle (max): 89 %
• Output Voltage: 0.4 V to 4.73 V
• Output Current: 3000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 300 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Boost, Buck
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(T
A
= +25°C, unless otherwise noted.)
Low-Cost, High-Frequency, Current-Mode PWM
1.35
1.30
1.25
1.20
1.15
-3
OUTPUT VOLTAGE vs. LOAD CURRENT
-2
2.52
2.51
2.50
2.49
2.48
2.47
2.46
1.06
1.04
1.02
1.00
0.98
0.96
LOAD CURRENT (A)
3.0
3.0
-1
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX1957
V
_______________________________________________________________________________________
OUT
FREQUENCY vs. INPUT VOLTAGE
T
A
0
= 2.5V
3.5
= +25 C
3.5
V
CIRCUIT OF FIGURE 3
IN
I
LOAD
T
= 5V
A
INPUT VOLTAGE (V)
= -40 C
INPUT VOLTAGE (V)
1
= 0
I
4.0
MAX1954
4.0
MAX1953
LOAD
T
A
2
= 5A
= +85 C
CIRCUIT OF FIGURE 2
4.5
4.5
3
5.0
5.0
Typical Operating Characteristics (continued)
2.60
2.55
2.50
2.45
2.40
5.5
5.5
3.0
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
I
INPUT VOLTAGE (V)
LOAD
I
LOAD
4.0
MAX1953
= 3A
= 0
CIRCUIT OF FIGURE 1
4.5
1.29
1.27
1.25
1.23
1.21
1.19
320
315
310
305
300
295
290
285
280
275
270
5.0
3.0
3.0
OUTPUT VOLTAGE vs. INPUT VOLTAGE
V
OUT
T
FREQUENCY vs. INPUT VOLTAGE
A
= +25 C
5.5
= 1.25V
3.5
3.5
MAX1954/MAX1957
Buck Controller
INPUT VOLTAGE (V)
T
INPUT VOLTAGE (V)
I
A
I
LOAD
LOAD
= +85 C
4.0
MAX1957
4.0
1.76
1.74
1.72
1.70
1.68
1.66
1.64
= 3A
= 0
T
3.0
A
OUTPUT VOLTAGE vs. INPUT VOLTAGE
CIRCUIT OF FIGURE 3
= -40 C
4.5
4.5
3.5
I
LOAD
I
LOAD
5.0
5.0
= 0
INPUT VOLTAGE (V)
= 5A
4.0
MAX1954
5.5
5.5
CIRCUIT OF FIGURE 2
4.5
5.0
5.5
5