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MAX1927 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX1927
Description  Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters
Download  12 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1927 Datasheet(HTML) 4 Page - Maxim Integrated Products

 
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Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 3.6V, SHDN = BATT, CREF = 0.1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
FB Input Current
MAX1927R
150
nA
Reference Voltage Accuracy
1.22
1.269
V
Reference-Supply Rejection
2.6V < VBATT < 5.5V
2
mV
PWM CONTROLLER
VBATT = 3.6V
0.4
P-Channel On-Resistance
VBATT = 2.6V
0.5
VBATT = 3.6V
0.30
N-Channel On-Resistance
VBATT = 2.6V
0.35
P-Channel Current-Limit Threshold
1.1
0.10
1.6
A
P-Channel Pulse-Skipping Current Threshold
0.10
0.16
A
LX Leakage Current
VBATT = 5.5V, LX = GND or BATT
-20
+20
µA
Maximum Duty Cycle
100
%
Minimum Duty Cycle
PWM = GND
0
%
Internal Oscillator Frequency
0.8
1.2
MHz
POK COMPARATOR
BATT Operating Voltage Range
IPOK = 0.1 mA
1
5.5
V
Output Low Voltage
VFB = 0.5V, IPOK = 1mA
0.1
V
Output High Leakage Current
VPOK = 5.5V
1
µA
MAX1927R
0.650
0.700
MAX1928-15
1.305
1.395
MAX1928-18
1.566
1.674
POK Threshold
MAX1928-25
2.175
2.325
V
Output Valid to POK Release Delay
POK transitions to high impedance 20ms
after VFB > VPOK
15
25
ms
LOGIC INPUTS (SHDN, PWM)
Logic Input High
2.6V < VBATT < 5.5 V
1.6
V
Logic Input Low
2.6V < VBATT < 5.5 V
0.6
V
Logic Input Current
VBATT = 5.5V
1
µA


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