MAX1842EEE+ Maxim Integrated Products, MAX1842EEE+ Datasheet - Page 7

• Manufacturer Part Number: MAX1842EEE+
• Description: IC BUCK SYNC FIX/ADJ 1A 16QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1842EEE+

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.5V, 1.8V, 2.5V, Adj
• Current - Output: 1A
• Frequency - Switching: 1MHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 1W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1, T
Synchronous Rectification and Internal Switches
1200
1000
800
600
400
200
100
100
95
90
85
80
75
70
65
60
55
50
95
90
85
80
75
70
65
60
55
50
0
0.001
0.001
0
EFFICIENCY vs. OUTPUT CURRENT
V
R
EFFICIENCY vs. OUTPUT CURRENT
V
f
_______________________________________________________________________________________
A
PWM
IN
TOFF
OUT
1A/2.7A, 1MHz, Step-Down Regulators with
0.5
= +25°C, unless otherwise noted.)
= 5V, V
V
V
V
= 2.5V, R
= 1070kHz
SWITCHING FREQUENCY
IN
= 240kΩ
IN
IN
0.01
0.01
(V
vs. OUTPUT CURRENT
V
f
= 5V, V
= 5V, V
= 3.3V, V
PWM
OUT
IN
OUTPUT CURRENT (A)
OUT
OUTPUT CURRENT (A)
(f
1.0
V
L = 4.7μH, R
V
f
PWM
= 5.0V, L = 2.5μH)
PWM
IN
OUT
= 1.5V, R
= 770kHz
TOFF
= 1.8V, L = 5.6μH,
MAX1842
OUT
OUT
MAX1842
MAX1842
= 3.3V, V
OUT
= 1.8V, R
= 910kHz
I
OUT
= 47kΩ,
= 2.5V, L = 2.5μH
= 1.5V, L = 2.5μH
= 270kHz)
0.1
1.5
0.1
= 1.5V, L = 1.5μH
TOFF
(A)
TOFF
OUT
TOFF
= 1OOkΩ,
2.0
= 1.8V,
= 160kΩ
= 75kΩ,
1
1
2.5
Typical Operating Characteristics (continued)
3.0
10
10
100
-0.1
-0.2
-0.3
-0.4
0.1
95
90
85
80
75
70
65
60
55
50
0
0.001
0.001
EFFICIENCY vs. OUTPUT CURRENT
V
f
PWM
V
V
OUT
IN
IN
NORMALIZED OUTPUT ERROR
= 5V, V
= 3.3V, V
STARTUP AND SHUTDOWN
= 2.5V, R
= 610kHz
0.01
0.01
(V
V
f
vs. OUTPUT CURRENT
R
PWM
OUT
IN
OUT
V
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUT
IN
V
f
PWM
= 3.3V, L = 1.5μH)
OUT
OUT
= 2.5V, R
= 1000kHz
= 0.5Ω, R
TOFF
= 3.3V, V
= 1.5V, L = 2.5μH
MAX1842
MAX1842
MAX1842
= 1.8V, R
= 1.5V, L = 1.5μH
= 1050kHz
1ms/div
= 39kΩ,
0.1
0.1
TOFF
OUT
TOFF
TOFF
= 56kΩ,
= 1.5V
= 56kΩ
= 43kΩ,
1
1
MAX1842 toc16
10
10
0
0
0
0
I
1A/div
V
5V/div
V
2V/div
V
1V/div
INPUT
SHDN
SS
OUTPUT
7