MAX1966 Maxim, MAX1966 Datasheet - Page 6

• Manufacturer Part Number: MAX1966
• Description: Low-Cost Voltage-Mode PWM Step-Down Controllers
• Manufacturer: Maxim

Low-Cost Voltage-Mode PWM
Step-Down Controllers
(T
6
MAX1966
A
= +25°C, unless otherwise noted.)
_______________________________________________________________________________________
—
—
1
2
3
4
5
6
7
8
I
PIN
OUT
MAX1967
V
V
L = 22 F
IN
IN
= 5.0V
= 1.8V
10
1
2
3
4
5
6
7
8
9
COMP/EN
NAME
GND
VCC
BST
VIN
DH
FB
VL
DL
LX
Positive Supply of DH Driver. Connect 0.1µF ceramic capacitor between BST and LX.
Compensation Pin. Pulling COMP/EN low with an open-collector or open-drain device
turns off the output.
Feedback Input. Connect a resistive divider network to set V
Internal Chip Supply. Connect to VL via a 10 resistor.
Power Supply for LDO Regulator in the MAX1967 and Chip Supply for the MAX1966.
Bypass with a ceramic capacitor to ground (see application circuit).
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.
Low-Side External MOSFET Gate-Driver Output. D
Ground and Negative Current-Sense Input
Inductor Switching Node. L
D
High-Side External MOSFET Gate-Driver Output. D
H
driver.
Typical Operating Characteristics (continued)
X
is used for both current limit and the return supply of the
INDUCTOR
CURRENT
VOUT
VIN
FUNCTION
NO LOAD
SHUTDOWN WAVEFORMS
L
H
swings from V
swings from BST to L
10ms/div
OUT
Pin Description
. F
L
B
to GND.
threshold is 0.8V.
X
.
2V/div
1V/div
1A/div