MAX1700EEE-T 查看數據表（PDF） - Maxim Integrated

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MAX1700EEE-T

1-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters

Maxim Integrated 

1-Cell to 3-Cell, High-Power (1A),

Low-Noise, Step-Up DC-DC Converters

0.7V TO 5.5V

L1

D1

MAX1701 LX

CLK/SEL

POUT

ONA

10Ω

ONB

OUT

R3

0.22µF

ARBITRARY

VOLTAGE

LBP

POK VOLTAGE MONITOR

LBN

R4

REF

LBO LOW-BATTERY MONITOR

R5

AO ARBITRARY VOLTAGE MONITOR

GND PGND FB AIN

R6

10k

BATTERY

VOLTAGE

POUT

REF

MAX1701

LBO

LBN

LBP

GND

R5

0.22µF

R6

Figure 7. Detecting Battery Voltages Below 1.25V (MAX1701)

Figure 5. Detecting Battery Voltage Above 1.25V

POUT

OUT

MAX1701

R3

LBO

LBP

LBN

REF

R4

0.22µF

GND

OUTPUT P

C5

270k

10Ω

C3

0.22µF

OUT

POUT

R3

C4

LBN

MAX1701

R4

LBO

LBP

0.22µF

REF

GND

Figure 8. Using the Low-Battery Comparator for Load Control

During Start-Up

Figure 6. Using the Low-Battery Comparator to Sense the

Output Voltage (MAX1701)

between the positive battery terminal and GND (Figure

5). The resistor values are then calculated as follows:

R3 = R4(VTH/VLBN -1)

where VTH is the desired input voltage trip threshold

and VLBN = VREF = 1.25V. Since the input bias current

into LBP is less than 20nA, R4 can be a large value

(such as 270kΩ or less) without sacrificing accuracy.

The inputs have a common-mode input range from

0.5V to 1.5V and an input-referred hysteresis of 15mV.

The low-battery comparator can also be used to moni-

tor the output voltage, as shown in Figure 6.

To set the low-battery threshold to a voltage below the

1.25V reference, insert a resistor divider between REF

and LBN and connect the battery to the LBP input

through a 10kΩ current-limiting resistor (Figure 7). The

equation for setting the resistors for the low-battery

threshold is then as follows:

R5 = R6(VREF/VLBP -1)

where VLBP is the desired voltage threshold. In Figures

5, 6, and 7, LBO goes low for a low-voltage input. The

low-battery comparator can be used to check the out-

put voltage or to control the load directly on POUT dur-

ing start-up (Figure 8). Use the following equation to set

the resistor values:

R3 = R4(VOUTTH/VLBP - 1)

where VOUTTH is the desired output-voltage trip point

and VLBP is connected to the reference or 1.25V.

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