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MAX1742EEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= 3.3V, FBSEL = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
Note 2: Recommended operating frequency, not production tested.
Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
PARAMETER
SYMBOL
CONDITIONS
MIN MAX
UNITS
Input Voltage V
IN
3.0 5.5 V
V
IN
= 3V to 5.5V,
FBSEL = V
CC
2.475 2.575
FBSEL = unconnected 1.485 1.545
FBSEL = REF
1.782 1.854
Preset Output Voltage V
OUT
I
LOAD
= 0 to 1A
for MAX1742,
I
LOAD
= 0 to 2.5A
for MAX1842,
V
FB
= V
OUT
FBSEL = GND
1.078 1.122
V
Adjustable Output Voltage
Range
V
IN
= V
CC
= 3V to 5.5V, I
LOAD
= 0,
FBSEL = GND
V
REF
V
IN
V
Reference Voltage V
REF
1.078
1.122
V
V
IN
= 4.5V
200
PMOS Switch
On-Resistance
R
ON
,
P
I
LX
= 0.5A
V
IN
= 3V
250
V
IN
= 4.5V
150
NMOS Switch
On-Resistance
R
ON
,
N
I
LX
= 0.5A
V
IN
= 3V
200
mΩ
MAX1742 1.2 1.8
Current-Limit Threshold I
LIMIT
MAX1842 2.9 4.3
MAX1742
0.05
0.55
Idle Mode Current Threshold I
IM
MAX1842 0.2 1.0
A
No-Load Supply Current
I
IN
+ I
CC
V
FB
= 1.2V
600
µA
FB Input Bias Current I
FB
V
FB
= 1.2V 0
300
nA
Off-Time Default Period t
OFF
R
TOFF
= 110kΩ
0.85 1.15
µs
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
_______________________________________________________________________________________ 5
100
95
90
85
80
70
65
60
55
50
75
0.001 0.01 1
MAX1742
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= 5.0V, L = 6.0μH)
MAX1742 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
0.1
V
OUT
= 1.8V, R
TOFF
= 75kΩ,
f = 833kHz
V
OUT
= 1.5V, R
TOFF
= 100kΩ, f = 692kHz
V
OUT
= 2.5V, R
TOFF
= 47kΩ, f = 926kHz
100
95
90
85
80
70
65
60
55
50
75
0.001 0.01 1
MAX1742
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= 3.3V, L = 3.9μH)
MAX1742 toc02
OUTPUT CURRENT (A)
EFFICIENCY (%)
0.1
V
OUT
= 2.5V, R
TOFF
= 36kΩ, f = 456kHz
V
OUT
= 1.8V, R
TOFF
= 43kΩ, f = 869kHz
V
OUT
= 1.5V, R
TOFF
= 56kΩ, f = 833kHz
100
95
90
85
80
70
65
60
55
50
75
0.001 0.01 1
MAX1742
EFFICIENCY vs.OUTPUT CURRENT
(f
PWM
= 270kHz)
MAX1742 toc03
OUTPUT CURRENT (A)
EFFICIENCY (%)
0.1
V
IN
= 5V, V
OUT
= 1.8V,
L = 15
μH, R
TOFF
= 240kΩ
V
IN
= 3.3V, V
OUT
= 1.8V,
L = 10
μH, R
TOFF
= 160kΩ
0.5
0.4
0.3
0.2
0.1
-0.1
-0.2
-0.3
-0.4
-0.5
0
0.001 0.01 1
MAX1742
NORMALIZED OUTPUT ERROR
vs. OUTPUT CURRENT
MAX1742 toc04
OUTPUT CURRENT (A)
NORMALIZED OUTPUT ERROR (%)
0.1
V
IN
= 5V, V
OUT
= 1.5V, L = 6μH
V
IN
= 3.3V, V
OUT
= 1.5V
0
300
100
200
600
900
700
1100
1000
400
500
800
0 0.2 0.4 0.6 0.8 1.0
MAX1742
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
MAX1742 toc05
OUTPUT CURRENT (A)
FREQUENCY (kHz)
V
IN
= 5V, V
OUT
= 2.5V, L = 6μH
V
IN
= 5V, V
OUT
= 1.5V, L = 6μH
V
IN
= 3.3V, V
OUT
= 1.5V, L = 3.9μH
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
6 _______________________________________________________________________________________
0V
0V
0V
0A
MAX1742
STARTUP AND SHUTDOWN
I
INPUT
1A/div
V
OUTPUT
1V/div
V
SS
2V/div
MAX1742 toc06
1ms/div
V
SHDN
5V/div
0V
MAX1742
LOAD-TRANSIENT RESPONSE
V
OUTPUT
AC-COUPLED,
50mV/div
I
L
0.5A/div
MAX1742 toc07
10μs/div
0V
MAX1742
LINE-TRANSIENT RESPONSE
V
INPUT
2V/div
V
OUTPUT
20mV/div
AC-COUPLED
MAX1742 toc08
20μs/div
I
OUT
= 1A, V
OUT
= 1.5V, R
TOFF
= 100kΩ, L = 6μH
0
150
100
50
200
250
300
350
400
450
500
0
30
20
10
40
50
60
70
80
90
100
021 3456
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1742 toc09
V
IN
(V)
NO-LOAD SUPPLY CURRENT, I
IN
+ I
CC
(μA)
SHUTDOWN SUPPLY CURRENT, I
IN
+ I
CC
(nA)
NO LOAD
SHUTDOWN
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
4.5
4.0
5.0
0 100 150 20050 250 300 350 450400 500
OFF-TIME vs. R
TOFF
MAX1742 toc10
R
TOFF
(kΩ)
t
OFF
(μs)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX1742EEE+T

Mfr. #:
Buy MAX1742EEE+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 1A/2.7A 1MHz Step Down Regulator
Lifecycle:
New from this manufacturer.
Delivery:
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