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PDF MAX1734 Data sheet ( Hoja de datos )
| Número de pieza | MAX1734 | |
| Descripción | Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1586; Rev 0; 7/00
Low-Voltage, Step-Down DC-DC Converters
in SOT23
General Description
The MAX1733/MAX1734 step-down DC-DC converters
deliver over 250mA to outputs as low as 1.25V. These
converters use a unique proprietary current-limited con-
trol scheme that achieves over 90% efficiency. These
devices maintain extremely low quiescent supply cur-
rent (40µA), and their high 1.2MHz (max) operating fre-
quency permits small, low-cost external components.
This combination of features makes the MAX1733/
MAX1734 excellent high-efficiency alternatives to linear
regulators in space-constrained applications.
Internal synchronous rectification greatly improves effi-
ciency and eliminates the external Schottky diode
required in conventional step-down converters. Both
devices also include internal digital soft-start to limit
input current upon startup and reduce input capacitor
requirements.
The MAX1733 provides an adjustable output voltage
(1.25V to 2.0V). The MAX1734 provides factory-preset
output voltages (see Selector Guide). Both are avail-
able in space-saving 5-pin SOT23 packages.
Applications
Cellular, PCS, and Cordless Telephones
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
Typical Operating Circuit
Features
o 250mA Guaranteed Output Current
o Synchronous Rectifier for Over 90% Efficiency
o Tiny 5-Pin SOT23 Package
o 40µA Quiescent Supply Current
o 0.01µA Logic-Controlled Shutdown
o Up to 1.2MHz Switching Frequency
o Fixed 1.8V or 1.5V Outputs (MAX1734)
o Adjustable Output Voltage (MAX1733)
o ±1.5% Initial Accuracy
o 2.7V to 5.5V Input Range
o Soft-Start Limits Startup Current
Ordering Information
PART
MAX1733EUK-T
MAX1734EUK_ _-T
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
Note: The MAX1734 offers two output voltages. See the Selector
Guide, then insert the proper designator into the blanks above to
complete the part number.
Selector Guide
PART
MAX1733EUK
MAX1734EUK18
MAX1734EUK15
VOUT (V)
Adjustable
1.8
1.5
TOP MARK
ADKY
ADKW
ADKX
Pin Configuration
INPUT
+2.7V TO +5.5V
2.2µF
IN LX
MAX1734
SHDN
OUT
10µH
VOUT AT
250mA
22µF
TOP VIEW
IN 1
5 LX
MAX1733
GND 2 MAX1734
GND
SHDN 3
4 OUT (FB)
( ) ARE FOR MAX1733 ONLY.
SOT23-5
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Low-Voltage, Step-Down DC-DC Converters
in SOT23
Typical Operating Characteristics (continued)
(CIN = 2.2µF ceramic, COUT = 22µF tantalum, L = 10µH, unless otherwise noted.)
SOFT-START AND SHUTDOWN RESPONSE
MAX1733/4-09
VIN = 3.6V, VOUT = 1.8V, RLOAD = 7Ω
VOUT
1V/div
IIN
100mA/div
200µs/div
VSHDN
5V/div
LOAD-TRANSIENT RESPONSE
MAX1733/4-12
VIN = 3.6V, VOUT = 1.8V, ILOAD = 20mA TO 200mA
VOUT
AC-COUPLED
50mV/div
ILOAD
100mA/div
4µs/div
LIGHT-LOAD LINE-TRANSIENT RESPONSE
MAX1733/4-10
VIN = 3.4V TO 3.8V, VOUT = 1.8V, ILOAD = 20mA
VOUT
AC-COUPLED
50mV/div
HEAVY-LOAD LINE-TRANSIENT RESPONSE
MAX1733/4-11
VIN = 3.4V TO 3.8V, VOUT = 1.8V, ILOAD = 200mA
VOUT
AC-COUPLED
50mV/div
4µs/div
VIN
AC-COUPLED
200mV/div
4µs/div
VIN
AC-COUPLED
200mV/div
Pin Description
PIN NAME
FUNCTION
1
IN
Supply Voltage Input. Input range from +2.7V to +5.5V. Bypass with a 2.2µF ceramic capacitor to
GND.
2
GND
Ground
3
SHDN
Active-Low Shutdown Input. Connect SHDN to IN for normal operation. In shutdown, LX becomes
high impedance and quiescent current drops to 0.01µA.
4
FB
MAX1733 Voltage Feedback Input. FB regulates to 1.25V nominal. Connect FB to an external
voltage-divider between the output voltage and GND.
OUT
MAX1734 Voltage Sense Input. OUT is connected to an internal voltage-divider.
5 LX Inductor Connection
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX1734.PDF ] | |
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