MAX4919B 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4919B

Battery Power-Up Logic with Overvoltage and Overcurrent Protection

Maxim Integrated 

Battery Power-Up Logic with Overvoltage

and Overcurrent Protection

PIN

1

2

3

4, 5

6

7

8

9

10, 11

12

13

14

EP

Pin Description

NAME

FUNCTION

GP1

p-Channel MOSFET Gate-Drive Output. GP1 pulls the external pFET gate down when the input is above

ground.

Voltage Input. IN powers the charge pump required to turn on GN1. When the correct adapter is

plugged in, a one-shot turns on the internal pFET for 1.2s, allowing time for the microprocessor (µP) to

power-up and drive PWR_HOLD high. Bypass IN with a minimum 1µF ceramic capacitor as close as

IN

possible to the device for ±15kV ESD protection. When operating the

MAX4919B/MAX4920B/MAX4921B with an external pFET at GP1, place the 1µF capacitor to GND as

close to the drain of the pFET as possible for the ±15kV ESD protection. If ±15kV ESD protection is not

required, place a minimum 0.1µF capacitor at IN to GND.

GN1

n-Channel MOSFET Gate-Drive Output. GN1 is the output of an on-chip charge pump. When VUVLO <

VIN < VOVLO, GN1 is driven above the source voltage to turn on the external n-channel MOSFET.

BTI

Battery Switch Input. BTI powers the internal circuitry. Bypass BTI with a 0.1µF capacitor. Both BTI

inputs must be externally connected together.

HP_PWR

Car-Kit Detection Input. When a car kit is plugged into HP_PWR, a one-shot turns on the internal pFET

for 1.2s, allowing time for the µP to power-up and drive PWR_HOLD high.

PWR_ON

Power-On Input. Drive PWR_ON high to turn on the internal pFET. The inverse of the PWR_ON logic

state is represented at the ONOK logic output.

GND Ground

ONOK

Open-Drain PWR_ON Indicator Output. ONOK is a logic output with the inverse state of the PWR_ON

input.

BTO Battery Switch Output. Both BTO outputs must be externally connected together.

PWR_HOLD Power-Hold Input. Drive PWR_HOLD high to turn on internal pFET.

ACOK

Open-Drain Adapter Voltage Indicator Output. ACOK pulls low when the adapter voltage is stable

between UVLO and OVLO for 25ms. Connect a pullup resistor from ACOK to a logic supply.

EN

Enable Input. Drive EN low for normal operation. Drive EN high to turn off the external MOSFETs and

enter shutdown mode.

—

Exposed Paddle. Connect EP to ground.

Detailed Description

Undervoltage Lockout (UVLO)

The MAX4919B/MAX4920B have a 4.27V (typ) under-

voltage threshold (UVLO), while the MAX4921B has

2.35V (typ) UVLO threshold. When VIN is less than

UVLO, GN1 is held low and ACOK is high impedance.

Overvoltage Lockout Thresholds (OVLO)

The MAX4919B has a 6.38V (typ) overvoltage threshold

(OVLO), the MAX4920B has a 5.8V (typ) typical OVLO,

and the MAX4921B has a 4.65V (typ) OVLO. When VIN

is greater than OVLO, GN1 is held low and ACOK is

high impedance.

Powering the MAX4919B/

MAX4920B/MAX4921B

BTI powers the MAX4919B/MAX4920B/MAX4921B inter-

nal circuitry. BTI also connects internally to a 1.8A (min)

pFET that conducts an external load to the battery using

the BTO output. See the Battery Switchover section.

GP1 Driver

When the input voltage goes above ground, GP1 pulls

low and turns on the pFET. An internal clamp protects

the pFET by insuring that the GP1 to IN voltage does

not exceed 19.5V when the input (IN) rises to 28V.

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