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MAX1678 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX1678
Description  1-Cell to 2-Cell, Low-Noise, High-Efficiency, Step-Up DC-DC Converter
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1678 Datasheet(HTML) 6 Page - Maxim Integrated Products

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1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
6
_______________________________________________________________________________________
A
B
C
SWITCHING WAVEFORM
VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,
L1 = SUMIDA CD43-470
A: LX, 2V/div
B: VOUT, 50mV/div AC COUPLED
C: INDUCTOR CURRENT, 100mA/div
5
µs/div
Typical Operating Characteristics (continued)
(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), TA = +25°C, unless otherwise noted.)
Pin Description
PIN
Battery-Power Input
BATT
1
FUNCTION
NAME
A
B
C
LOAD-TRANSIENT RESPONSE
VOUT = 3.3V, VBATT = 1.2V, COUT = 10µF,
L1 = SUMIDA CD43-470,
A: VOUT, 50mV/div, AC COUPLED
B: INDUCTOR CURRENT,
C: LOAD, 2mA to 12mA
100mA/div
100
µs/div
A
B
LINE-TRANSIENT RESPONSE
VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,
L1 = SUMIDA CD43-470
A: VOUT, 50mV/div, AC COUPLED
B: VIN, 1V/div, 1.2V to 2.2V
200
µs/div
A
B
C
POWER-UP RESPONSE
VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10µF,
L1 = SUMIDA CD43-470
A: VOUT, 1V/div
B: INDUCTOR CURRENT, 100mA/div
C: SHDN, 5V/div
100
µs/div
Power-Fail Input. When the voltage at PFI is below 614mV, PFO sinks current.
PFI
2
Active-Low Shutdown. Connect SHDN to BATT for normal operation.
SHDN
4
Open-Drain Power-Fail Output. PFO sinks current when PFI is below 614mV.
PFO
3
Ground
GND
6
Power Output and IC Power Input (bootstrapped). OUT is the feedback input for 3.3V operation. Connect
the filter capacitor close to OUT.
OUT
8
N-Channel MOSFET Switch Drain and P-Channel Synchronous-Rectifier Drain
LX
7
Dual-Mode Feedback Input. Connect FB to GND for fixed-output operation (3.3V). Connect FB to a feed-
back-resistor network for adjustable output voltage operation (2V to 5.5V). FB regulates to 1.23V.
FB
5


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