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MAX1730EUB+T

P1-P3P4-P6P7-P8
General Description
The MAX1730 regulated step-down charge pump gen-
erates up to 50mA at fixed output voltages of 1.8V or
1.9V from an input voltage in the 2.7V to 5.5V range.
Specifically designed to provide high-efficiency logic
supplies in applications that demand a compact
design, the MAX1730 employs fractional conversion
techniques to provide efficiency exceeding that of a lin-
ear regulator.
The MAX1730 operates at up to 2MHz, permitting the
use of small 0.22µF flying capacitors while maintaining
low 75µA quiescent supply current. Proprietary soft-
start circuitry prevents excessive current from being
drawn from the supply during startup, making the
MAX1730 compatible with higher impedance sources
such as alkaline and lithium-ion cells.
The MAX1730 is available in a space-saving 10-pin
µMAX package that is only 1.09mm high and occupies
one-half the area of an 8-pin SO.
Applications
Low-Voltage Logic Supplies
Wireless Handsets
PDAs
PC Cards
Hand-Held Instruments
Features
♦ > 85% Peak Efficiency
♦ 50mA Guaranteed Output Current
♦ Dual-Mode 1.8V or 1.9V Output
♦ ±3% Output Voltage Accuracy
♦ Up to 2MHz Operating Frequency
♦ Small 0.22µF Capacitors
♦ No Inductor Required
♦ 2.7V to 5.5V Input Voltage Range
♦ Output Disconnects from Input in Shutdown Mode
♦ Small 10-Pin µMAX Package (1.09mm max height)
MAX1730
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
IN
OUT
C2P
C2NC1N
C1P
SHDN
FB
MAX1730
µMAX
TOP VIEW
PGNDGND
0.22µF
MAX1730
OUT
C2P
C2N
PGND
0.22µF
4.7µF
1µF
GND
IN
C1P
C1N
FB
OUTPUT
1.8V OR 1.9V, UP TO 50mA
INPUT
2.7V TO 5.5V
SHDN
Typical Operating Circuit
19-1618; Rev 0; 4/00
PART
MAX1730EUB -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
Pin Configuration
Ordering Information
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.
MAX1730
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, FB = GND, SHDN = IN, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, OUT, SHDN, FB to GND .....................................-0.3V to +6V
C1P, C1N, C2P, C2N to GND......................-0.3V to (V
IN
+ 0.3V)
GND to PGND.....................................................................±0.3V
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature Range (soldering, 10s)......................+300°C
FB = GND
FB = IN
SHDN = IN or GND
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
Falling edge (100mV hysteresis)
V
OUT
= GND
V
IN
= 4.2V, SHDN = GND, V
OUT
= 1.8V or GND
SHDN = IN
OUT forced to 1.8V, V
IN
= 1.8V to 5.5V,
SHDN = GND
V
IN
= 2.7V to 5.5V,
I
OUT
= 0 to 50mA
CONDITIONS
µA
-1 1
I
SHDN
Shutdown Logic Input Current
V
0.6
V
IL
SHDN Logic Input Low Voltage
V
1.4
V
IH
SHDN Logic Input High Voltage
ms
4.1
Startup Timer
V
IN
Transition Voltage
(V
IN
Rising)
°C
15
Thermal Shutdown Threshold
Hysteresis
°C
150
Thermal Shutdown Threshold
MHz
1.5 2.0 2.5
Oscillator Frequency
V
1.746 1.80 1.854
V
OUT
Output Voltage
V
2.3 2.6
V
2.7 5.5
V
IN
Input Voltage Range
Input Undervoltage Lockout
mA
45 125
Output Short-Circuit Current
µA
15
Shutdown Supply Current
µA
75 150
No-Load Supply Current
µA
15
Output Leakage Current
1.843 1.90 1.957
UNITSMIN TYP MAXSYMBOLPARAMETER
V
4.00 4.12 4.30
3.1 3.2 3.35
From 2:3 to 1:2
From 1:1 to 2:3
FB = GND
MAX1730
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, FB = GND, SHDN = IN, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
SHDN = IN or GND
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
Falling edge (100mV hysteresis)
FB = GND
V
OUT
= GND
V
IN
= 4.2V, SHDN = GND
SHDN = IN
OUT forced to 1.8V, V
IN
= 1.8V to 5.5V,
SHDN = GND
V
IN
= 2.7V to 5.5V,
I
OUT
= 0 to 50mA
CONDITIONS
FB = GND
FB = IN
µA
-1 1
I
SHDN
Shutdown Logic Input Current
V
0.6
V
IL
SHDN Logic Input Low Voltage
V
1.4
V
IH
SHDN Logic Input High Voltage
V
3.1 3.35
V
IN
Transition Voltage
(V
IN
Rising)
MHz
1.5 2.5
fOscillator Frequency
V
1.746 1.854
V
OUT
Output Voltage
V
2.3 2.6
V
2.7 5.5
V
IN
Input Voltage Range
Input Undervoltage Lockout
mA
125
Output Short-Circuit Current
µA
5
Shutdown Supply Current
µA
150
No-Load Supply Current
µA
5
Output Leakage Current
1.843 1.957
From 1:1 to 2:3
UNITSMIN MAXSYMBOLPARAMETER
From 2:3 to 1:2
4.00 4.30
P1-P3P4-P6P7-P8

MAX1730EUB+T

Mfr. #:
Buy MAX1730EUB+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 50mA Regulated Step-Down
Lifecycle:
New from this manufacturer.
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