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MAX1974 Datasheet

  • MAX1974

  • "Smallest 1A, 1.4MHz Step- Down Regulators"

  • 331.53KB

  • Maxim   Maxim

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19-2547; Rev 0; 7/02
Smallest 1A, 1.4MHz Step-Down Regulators
General Description
The MAX1973/MAX1974 are constant-frequency
1.4MHz pulse-width-modulated (PWM) current-mode
step-down regulators. The output voltage can be set as
low as 0.75V using an external voltage-divider, or it can
be set to preset outputs of 1V, 1.5V (MAX1974), 1.8V,
or 2.5V (MAX1973) without requiring external resistors.
The MAX1973 also includes a voltage-margining fea-
ture that offsets the output voltage up or down 4% to
facilitate board-level production testing.
A fixed 1.4MHz operating frequency ensures operation
outside the DSL frequency band, provides fast transient
response, and allows the use of small external compo-
nents. Only 4.7碌F input and output ceramic capacitors
are needed for 1A applications. Forced PWM operation
ensures a constant switching frequency over all load
conditions.
Output voltage accuracy is 鹵1% over load, line, and
temperature operating ranges. The MAX1973 features
voltage margining; the MAX1974 provides a POK out-
put to indicate when the output has reached 90% of its
nominal regulation voltage. Both devices are available
in small 10-pin 碌MAX packages.
o
Tiny Circuit Footprint of 0.19in
2
o
Ultra-Low Circuit Height of 1.8mm
o
4.7碌F Ceramic Input and Output Capacitors
o
2.6V to 5.5V Input Voltage
o
1A Output Current
o
1% Accurate
o
Built-In 鹵4% Logic-Controlled Voltage Margining
(MAX1973)
o
Preset 1V, 1.5V, 1.8V, 2.5V, or 0.75V to V
IN
Adjustable Output
o
Fixed-Frequency PWM Current-Mode Operation
o
1.4MHz Switching Frequency, Operate Outside
DSL Band
o
100% Duty-Cycle Dropout Capability
o
Small External Components
Features
MAX1973/MAX1974
Applications
Network Equipment
Cellular Base Stations
DSL and Wireless Modems/Routers
Optical Modules
Central-Office DSL and Telecom
DSP/ASIC Core and IO supplies
Selector Guide appears at end of data sheet.
TOP VIEW
FBSEL
1
COMP
FB
INPUT
2.6V TO 5.5V
IN
COMP
FB
FBSEL
MAX1973
SS
GND
CTL1
CTL2
PGND
VOLTAGE
MARGINING
ON/OFF
FBSEL
1
COMP
FB
SS
GND
MAX1974 OUTPUT DOWN TO 0.75V
2
3
4
5
LX
OUTPUT
1.25V TO V
IN
1A
SS
GND
2
3
4
5
Ordering Information
PART
MAX1973EUB
MAX1974EUB
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
10 碌MAX
10 碌MAX
Pin Configurations
Typical Operating Circuit
10
CTL1
9
IN
LX
PGND
CTL2
MAX1973
8
7
6
碌MAX
10
ON
9
IN
LX
PGND
POK
MAX1974
8
7
6
碌MAX
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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