Rainbow Electronics MAX1730 User Manual
Page 2
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
1
5
Shutdown Supply Current
µA
75
150
No-Load Supply Current
µA
1
5
Output Leakage Current
1.843
1.90
1.957
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
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