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MAX1966ESA+

P1-P3P4-P6P7-P9P10-P12P13-P15
MAX1966/MAX1967
Low-Cost Voltage-Mode PWM
Step-Down Controllers
4 _______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT
(1.2V/3A)
60
MAX1966 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5.0V
V
IN
= 3.3V
MAX1966
FIGURE 1
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.8V/3A)
MAX1966
60
MAX1966 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5.0V
V
IN
= 3.3V
MAX1966
FIGURE 1
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.2V/5A)
MAX1966
60
MAX1966 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5.0V
V
IN
= 5.0V
V
IN
= 3.3V
V
IN
= 3.3V
MAX1966
FIGURE 1
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.8V/5A)
MAX1966
60
MAX1966 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5.0V
V
IN
= 3.3V
MAX1966
FIGURE 1
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.2V/3A)
MAX1967
60
MAX1966 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 12V
MAX1967
FIGURE 2
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.8V/3A)
MAX1967
60
MAX1966 toc06
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 12V
MAX1967
FIGURE 2
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (3.3V/3A)
MAX1967
60
MAX1966 toc07
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 12V
MAX1967
FIGURE 2
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.2V/5A)
MAX1967
60
MAX1966 toc08
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 5V
V
IN
= 12V
V
IN
= 20V
MAX1967
FIGURE 2
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (1.8V/5A)
MAX1967
60
MAX1966 toc09
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 12V
V
IN
= 20V
MAX1967
FIGURE 2
MAX1966/MAX1967
Low-Cost Voltage-Mode PWM
Step-Down Controllers
_______________________________________________________________________________________ 5
100
50
0.01 0.1 1 10
EFFICIENCY vs. LOAD CURRENT (3.3V/5A)
MAX1967
60
MAX1966 toc10
LOAD CURRENT (A)
EFFICIENCY (%)
70
80
90
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
MAX1967
FIGURE 2
98
100
102
104
2.5 7.0 16.011.5 20.5 25.0
FREQUENCY vs. INPUT VOLTAGE
MAX1966 toc11
INPUT VOLTAGE (V)
FREQUENCY (kHz)
MAX1966
V
OUT
= 1.8V
MAX1967
V
OUT
= 3.3V
80
90
100
110
120
130
-40 -25 20 355-10 50 8065
FREQUENCY vs. TEMPERATURE
MAX1966 toc12
TEMPERATURE (
°
C)
FREQUENCY (kHz)
2A/div
2A/div
200mV/div
INDUCTOR
CURRENT
I
OUT
V
OUT
400ms/div
LOAD STEP RESPONSE
MAX1966 toc15
V
IN
= 5.0V, V
OUT
= 1.8V
L = 22µH
I
LOAD
= 0.1 TO 3A
1A/div
1V/div
2V/div
INDUCTOR
CURRENT
V
OUT
V
IN
2ms/div
START-UP WAVEFORM
MAX1966 toc16
NO LOAD
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
0
2
4
6
8
10
41491924
MAX1967 SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1966 toc14
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX1967
V
OUT
= 3.3V
MAX1966/MAX1967
Low-Cost Voltage-Mode PWM
Step-Down Controllers
6 _______________________________________________________________________________________
MAX1966 toc17
I
OUT
V
IN
= 5.0V
V
IN
= 1.8V
L = 22µF
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
1A/div
1V/div
2V/div
INDUCTOR
CURRENT
VOUT
VIN
10ms/div
SHUTDOWN WAVEFORMS
MAX1966 toc18
NO LOAD
Pin Description
PIN
MAX1966 MAX1967
NAME FUNCTION
1 10 BST Positive Supply of DH Driver. Connect 0.1µF ceramic capacitor between BST and LX.
2 1 COMP/EN
Compensation Pin. Pulling COMP/EN low with an open-collector or open-drain device
turns off the output.
3 2 FB Feedback Input. Connect a resistive divider network to set V
OUT
. F
B
threshold is 0.8V.
— 3 VCC Internal Chip Supply. Connect to VL via a 10Ω resistor.
4 4 VIN
Power Supply for LDO Regulator in the MAX1967 and Chip Supply for the MAX1966.
Bypass with a ceramic capacitor to ground (see application circuit).
— 5VL
Output of Internal 5V LDO. Bypass with a 2.2µF capacitor to GND, or if VIN < 5.5,
connect VL to VIN and bypass with a 0.1µF capacitor to GND.
5 6 DL Low-Side External MOSFET Gate-Driver Output. D
L
swings from V
L
to GND.
6 7 GND Ground and Negative Current-Sense Input
78LX
Inductor Switching Node. L
X
is used for both current limit and the return supply of the
D
H
driver.
8 9 DH High-Side External MOSFET Gate-Driver Output. D
H
swings from BST to L
X
.
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX1966ESA+

Mfr. #:
Buy MAX1966ESA+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Voltage-Mode PWM Step-Down
Lifecycle:
New from this manufacturer.
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