MAX1967EUB Datasheet Download

Part No.:
MAX1967EUB
Download:
Download Datasheet
Description:
[Low-Cost Voltage-Mode PWM Step-Down Controllers]
File Size:
404 K
Page:
15 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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Low-Cost Voltage-Mode PWM
Step-Down Controllers
MAX1966/MAX1967
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
SHUTDOWN WAVEFORMS
MAX1966 toc17
NO LOAD
VIN
I
OUT
V
IN
= 5.0V
V
IN
= 1.8V
L = 22µF
VOUT
1V/div
INDUCTOR
CURRENT
10ms/div
Pin Description
PIN
NAME
MAX1966
1
2
3
4
5
6
7
8
MAX1967
10
1
2
3
4
5
6
7
8
9
BST
COMP/EN
FB
VCC
VIN
VL
DL
GND
LX
DH
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
OUT
. F
B
threshold is 0.8V.
Internal Chip Supply. Connect to VL via a 10Ω 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
L
swings from V
L
to GND.
Ground and Negative Current-Sense Input
Inductor Switching Node. L
X
is used for both current limit and the return supply of the
D
H
driver.
High-Side External MOSFET Gate-Driver Output. D
H
swings from BST to L
X
.
FUNCTION
6
_______________________________________________________________________________________
MAX1966 toc18
2V/div
1A/div