MAX17006BETP 查看數據表（PDF） - Maxim Integrated

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MAX17006BETP

1.2MHz, Low-Cost, High-Performance Chargers

Maxim Integrated 

1.2MHz, Low-Cost,

High-Performance Chargers

RS1

Q1a

15mΩ

SYSTEM LOAD

C7

0.1μF

CIN

ADAPTER

R6

50kΩ

CSSP

CSSN

BST

MAX17015B

DHI

D1

C4

0.68μF

N1

Q1b

BATTERY

LX

Figure 5. Current-Monitoring Design Battery Discharge

IINP can also be used to monitor battery discharge cur-

rent (see Figure 5). In the MAX17015B, when the

adapter is absent, drive ISET above 2.4V to enable IINP

during battery discharge. When the adapter is reinserted,

ISET must be released to the correct control level within

300ms.

AC Adapter Detection

The MAX17005B/MAX17006B/MAX17015B include a

hysteretic comparator that detects the presence of an

AC power adapter. When ACIN is lower than 2.1V, the

open-drain ACOK output becomes high impedance.

Connect a 10kΩ pullup resistance between LDO and

ACOK. Use a resistive voltage-divider from the

adapter’s output to the ACIN pin to set the appropriate

detection threshold. Select the resistive voltage-divider

so that the voltage on ACIN does not to exceed its

absolute maximum rating (6V).

LDO Regulator and VAA

An integrated low-dropout (LDO) linear regulator pro-

vides a 5.4V supply derived from DCIN, and delivers

over 40mA of load current. Do not use the LDO to

external loads greater than 10mA. The LDO powers the

gate drivers of the n-channel MOSFETs. See the

MOSFET Drivers section. Bypass LDO to PGND with a

4.7μF ceramic capacitor. VAA is a 4.2V reference sup-

plied by DCIN. VAA biases most of the control circuitry,

and should be bypassed to AGND with a 1μF or

greater ceramic capacitor.

Operating Conditions

The MAX17005B/MAX17006B/MAX17015B have the fol-

lowing operating states:

• Adapter Present: When DCIN is greater than 8.7V,

the controller detects the adapter. In this condition,

both the LDO and VAA turn on and battery charging

is allowed:

a) Charging: The total MAX17005B/MAX17006B/

MAX17015B quiescent current when charging is

3mA (max) plus the current required to drive the

MOSFETs.

b) Not Charging: To disable charging, drive ISET

below 26mV. When the adapter is present and

charging is disabled, the total adapter quiescent

current is less than 1.5mA and the total battery

quiescent current is less than 60μA. The charge

pump still operates.

• Adapter Absent (Power Fail): When VDCIN is less

than VCSIN + 120mV, the DC-DC converter is in

dropout. The charger detects the dropout condition

and shuts down.

The MAX17005B/MAX17006B/MAX17015B allow

charging under the following conditions:

• DCIN > 7.5V, LDO > 4V, VAA > 3.1V

• VDCIN > VCSIN + 420mV (300mV falling hysteresis)

• VISET > 45mV or PWM detected

____________________DC-DC Converter

The MAX17005B/MAX17006B/MAX17015B employ a

synchronous step-down DC-DC converter with an n-

channel high-side MOSFET switch and an n-channel

low-side synchronous rectifier. The charger features a

controlled inductor current-ripple architecture, current-

mode control scheme with cycle-by-cycle current limit.

The controller’s off-time (tOFF) is adjusted to keep the

high-side MOSFET junction temperature constant. In

this way, the controller switches faster when the high-

side MOSFET has available thermal capacity. This

allows the inductor current ripple and the output-volt-

age ripple to decrease so that smaller and cheaper

components can be used. The controller can also oper-

ate in discontinuous conduction mode for improved

light-load efficiency.

14 ______________________________________________________________________________________

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