MAX866 Просмотр технического описания (PDF) - Maxim Integrated
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MAX866 Datasheet PDF : 12 Pages
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3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT CAPABILITY
vs. TEMPERATURE
30
VIN = 1.2V
25
20
VIN = 0.9V
15
3.3V MODE
10
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
30
VOUT = 3.47V
28
26
IOUT
24
22
20
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1.255
REFERENCE VOLTAGE
vs. TEMPERATURE
1.250
IREF = 0A
1.245
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
______________________________________________________________Pin Description
PIN
MAX866 MAX867
1
1
2
—
—
2
3
3
4
4
5
5
6
6
7
7
8
8
NAME
–S—H—D—N–
3/–5–
FB
REF
LBO
LBI
OUT
GND
LX
FUNCTION
Shutdown Input. When low, the entire circuit is off and VOUT = VIN - VD, where VD is the
forward voltage drop of the external Schottky rectifier.
Selects the output voltage; connect to GND for 5V output, and to OUT for 3.3V output.
Feedback Input for adjustable-output operation. Connect to an external resistor voltage
divider between OUT and GND.
1.25V Reference Voltage Output. Bypass with 0.22µF to GND (0.1µF if there is no external
reference load). Maximum load capability is 250µA source, 20µA sink.
Low-Battery Output. An open-drain N-channel MOSFET sinks current when the voltage at
LBI drops below 1.25V.
Low-Battery Input. When the voltage on LBI drops below 1.25V, LBO sinks current.
If not used, connect to VIN.
Connect OUT to the regulator output. OUT provides bootstrap power to the IC.
Power Ground. Must be low impedance; solder directly to ground plane.
N-Channel Power-MOSFET Drain
6 _______________________________________________________________________________________
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