Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - gate drivers Non-inverting High side uMAX 8

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

_______________General Description

The MAX1614 drives high-side, n-channel power MOSFETs

to provide battery power-switching functions in portable

equipment. The n-channel power MOSFETs typically have

one-third the on-resistance of p-channel MOSFETs of simi-

lar size and cost. An internal micropower regulator and

charge pump generate the high-side drive output voltage,

while requiring no external components.

The MAX1614 also features a 1.5%-accurate low-battery

comparator that can be used to indicate a low-battery

condition, provide an early power-fail warning to the sys-

tem microprocessor, or disconnect the battery from the

load, preventing deep discharge and battery damage. An

internal latch allows for pushbutton on/off control with very

low current consumption. Off-mode current consumption

is only 6µA while normal operation requires less than

25µA. The MAX1614 is available in the space-saving

µMAX

package that occupies about 60% less space

than a standard 8-pin SO.

________________________Applications

Notebook Computers

Portable Equipment

Hand-Held Instruments

Battery Packs

____________________________Features

o Internal On/Off Latch

o High-Side, n-Channel Power MOSFET Drive

o 25µA (max) Quiescent Current

o 6µA (max) Off Current

o Requires No External Components

o 1.5%-Accurate Low-Battery Detector

o Space-Saving µMAX Package

o 5V to 26V Input Voltage Range

o Drives Single or Back-to-Back MOSFETs

o Controlled Turn-On for Low Inrush Current

High-Side, n-Channel MOSFET

Switch Driver

BATT

SRC

GATE

GND

LBI

LBO

OFF

MAX1614

µMAX

TOP VIEW

PART TEMP RANGE PIN-PACKAGE

MAX1614C/D 0°C to +70°C Dice*

MAX1614EUA+ -40°C to +85°C 8 µMAX

MAX1614EUA/V+ -40°C to +85°C 8 µMAX

__________________Pin Configuration

MAX1614

OFF

LBO

GND

LBI

BATT

SRCGATE

LOAD

OPTIONAL FOR

REVERSE CURRENT

PROTECTION

__________Typical Operating Circuit

______________Ordering Information

Contact factory for dice specifications.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Devices are also available in a tape-and-reel package.

Specify tape-and-reel by adding “T” to the part number when

ordering.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

19-1176; Rev 1; 6/11

MAX1614

Summary of content (9 pages)

PAGE 1
MAX1614 High-Side, n-Channel MOSFET Switch Driver LE AVAILAB _______________General Description ____________________________Features The MAX1614 drives high-side, n-channel power MOSFETs to provide battery power-switching functions in portable equipment. The n-channel power MOSFETs typically have one-third the on-resistance of p-channel MOSFETs of similar size and cost. An internal micropower regulator and charge pump generate the high-side drive output voltage, while requiring no external components.
PAGE 2
MAX1614 High-Side, n-Channel MOSFET Switch Driver ABSOLUTE MAXIMUM RATINGS BATT, SRC to GND.................................................-0.3V to +30V GATE to SRC ..........................................................-0.3V to +12V GATE to GND .........................................................-0.3V to +36V GATE + SRC Sink Current, Continuous .............................2.7mA LBI, LBO, ON, OFF to GND....................................-0.3V to +12V LBO Current ..................................
PAGE 3
MAX1614 High-Side, n-Channel MOSFET Switch Driver ELECTRICAL CHARACTERISTICS (VBATT = 15V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP UNITS BATT Operating Range VGATE - VSRC > 3V, SRC = BATT 26 V BATT Shutdown Current ISHDN VBATT = 26V, ON = OFF = unconnected, IGATE = 0A, device latched off, VLBI = 1.5V 8 µA IBATT + ISAC VBATT = 26V, ON = OFF = unconnected, IGATE = 0A, device latched on, VLBI = 1.5V 40 µA Quiescent Current 5.
PAGE 4
MAX1614 High-Side, n-Channel MOSFET Switch Driver ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) GATE-DISCHARGE CURRENT vs. GATE VOLTAGE TA = +85°C 1.5 1.0 0.5 0 32 31 30 29 28 27 -0.
PAGE 5
MAX1614 High-Side, n-Channel MOSFET Switch Driver ______________________________________________________________Pin Description PIN NAME FUNCTION 1 ON SET Input to the On/Off Latch. Pulse ON low with OFF high to turn on the external MOSFET switch. When both ON and OFF are low, the part is off. 2 OFF RESET Input to the On/Off Latch. Pulse OFF low with ON high to turn off the external MOSFET switch. When both ON and OFF are low, the part is off. 3 LBO Open-Drain, Low-Battery Comparator Output.
PAGE 6
MAX1614 High-Side, n-Channel MOSFET Switch Driver BATT P GATE 8.5V LDO CPUMP POWER-ON RESET (BATT < 2V) 1.21V P LBI SRC N LBO N 50kHz OSC SOFT START 1µA ON 1µA N OFF ON ON OFF STATE 0 0 OFF 0 1 ON 1 0 OFF 1 1 LAST VALID STATE MAX1614 GND Figure 1.
PAGE 7
MAX1614 High-Side, n-Channel MOSFET Switch Driver Simple Low-Battery Disconnect/Fresh Battery Reconnect Circuit A simple undervoltage disconnect circuit is often desirable to prevent damage to secondary batteries due to repeated deep discharge or cell reversal. The Typical Operating Circuit turns off the MAX1614, disconnecting the battery from the load when the battery voltage falls below the minimum battery voltage required, (VLOW BATT).
PAGE 8
MAX1614 High-Side, n-Channel MOSFET Switch Driver Increasing Low-Battery Comparator Hysteresis The MAX1614 contains an on-chip comparator with 2% hysteresis for low-battery detection. If more than 2% hysteresis is needed on the low-battery comparator and LBO is connected to OFF, use the circuit in Figure 5 to add hysteresis. The circuit of Figure 5 shows LBO controlling an n-channel MOSFET that shorts R2 to add positive feedback to the trip point.
PAGE 9
MAX1614 High-Side, n-Channel MOSFET Switch Driver Revision History REVISION NUMBER REVISION DATE 0 12/96 Initial release 1 6/11 Added automotive-qualified part to the Ordering Information, added soldering temperature to the Absolute Maximum Ratings. DESCRIPTION PAGES CHANGED — 1, 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.