MAX1842EEE+ Maxim Integrated Products, MAX1842EEE+ Datasheet - Page 5

• 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
100
95
90
85
80
75
70
65
60
55
50
Synchronous Rectification and Internal Switches
0.001
V
f = 833kHz
EFFICIENCY vs. OUTPUT CURRENT
OUT
= 1.8V, R
V
V
-0.1
-0.2
-0.3
-0.4
-0.5
(V
OUT
OUT
0.5
0.4
0.3
0.2
0.1
0
IN
OUTPUT CURRENT (A)
0.001
= 2.5V, R
= 1.5V, R
0.01
= 5.0V, L = 6.0μH)
TOFF
_______________________________________________________________________________________
A
V
MAX1742
IN
1A/2.7A, 1MHz, Step-Down Regulators with
= +25°C, unless otherwise noted.)
= 75kΩ,
= 5V, V
NORMALIZED OUTPUT ERROR
TOFF
TOFF
vs. OUTPUT CURRENT
= 47kΩ, f = 926kHz
= 100kΩ, f = 692kHz
OUT
OUTPUT CURRENT (A)
0.01
0.1
= 1.5V, L = 6μH
MAX1742
V
IN
= 3.3V, V
0.1
1
OUT
= 1.5V
100
95
90
85
80
75
70
65
60
55
50
0.001
1
V
OUT
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 2.5V, R
(V
= 1.5V, R
V
OUT
IN
OUTPUT CURRENT (A)
0.01
TOFF
= 3.3V, L = 3.9μH)
= 1.8V, R
MAX1742
TOFF
= 36k
= 56k
TOFF
Ω
Typical Operating Characteristics
, f = 456kHz
Ω
= 43k
, f = 833kHz
0.1
Ω
, f = 869kHz
1100
1000
900
800
700
600
500
400
300
200
100
0
1
0
V
IN
= 5V, V
0.2
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
100
OUT
V
95
90
85
80
75
70
65
60
55
50
OUTPUT CURRENT (A)
IN
0.001
V
= 3.3V, V
= 2.5V, L = 6
IN
0.4
MAX1742
= 5V, V
EFFICIENCY vs.OUTPUT CURRENT
OUT
V
L = 15
OUT
0.6
IN
μ
= 1.5V, L = 3.9
= 5V, V
H
= 1.5V, L = 6
OUTPUT CURRENT (A)
(f
0.01
μ
PWM
H, R
V
L = 10
MAX1742
IN
OUT
0.8
TOFF
= 3.3V, V
= 270kHz)
= 1.8V,
μ
μ
μ
= 240k
H, R
H
H
1.0
TOFF
OUT
0.1
Ω
= 1.8V,
= 160k
Ω
1
5