Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX4959ELB+T

19-0874; Rev 1; 7/14

MAX4959/MAX4960

High-Voltage OVP with Battery Switchover

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 MAX4959/MAX4960 overvoltage protection con-

trollers protect low-voltage systems against high-volt-

age faults of up to +28V. When the input voltage

exceeds the overvoltage lockout (OVLO) threshold,

these devices turn off an external pFET to prevent dam-

age to the protected components. The undervoltage

lockout (UVLO) threshold holds the external pFET off

until the input voltage rises to the correct level. An addi-

tional safety feature latches off the pFET when an incor-

rect low-power adapter is plugged in.

The MAX4959/MAX4960 control an external battery

switchover pFET (P2) (see Figures 4 and 6) that switches

in the battery when the AC adapter is unplugged. The

undervoltage and overvoltage trip levels can be adjusted

with external resistors.

The input is protected against ±15kV HBM ESD when

bypassed with a 1µF ceramic capacitor to ground. All

devices are available in a small 10-pin (2mm x 2mm)

µDFN and are specified for operation over the extend-

ed -40°C to +85°C temperature range.

Applications

Notebooks

Laptops

Camcorders

Ultra-Mobile PCs

Features

o Overvoltage Protection Up to +28V

o ± 2.5% Accurate Externally Adjustable

OVLO/UVLO Thresholds

o Battery Switchover pFET Control

o Protection Against Incorrect Power Adapter

o Low (100µA Typ) Supply Current

o 25ms Input Debounce Timer

o 25ms Blanking Time

o 10-Pin (2mm x 2mm) µDFN Packages

Ordering Information

PART

TEMP RANGE

PIN -

PA C K A G E

TOP

MARK

MAX4959ELB+

-40°C to +85°C

10 µDFN AAO

MAX4960ELB+

-40°C to +85°C

10 µDFN AAP

123

10 9 8

GATE2

GND

N.C.

GATE1

OVS

N.C.

(SOURCE1)

MAX4959

MAX4960

µDFN

TOP VIEW

UVS

( ) MAX4960 ONLY.

Pin Configuration

Typical Operating Circuits appear at end of data sheet.

Denotes a lead-free package.

Summary of content (15 pages)

PAGE 1
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover General Description Features The MAX4959/MAX4960 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to +28V. When the input voltage exceeds the overvoltage lockout (OVLO) threshold, these devices turn off an external pFET to prevent damage to the protected components. The undervoltage lockout (UVLO) threshold holds the external pFET off until the input voltage rises to the correct level.
PAGE 2
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover ABSOLUTE MAXIMUM RATINGS IN, SOURCE1, GATE1, GATE2, to GND ................-0.3V to +30V VDD to GND ..............................................................-0.3V to +6V UVS, OVS, CB to GND .............................................-0.3V to +6V Continuous Power Dissipation (TA = +70°C) 10-pin µDFN (derate 5.0mW/°C above +70°C) ...........403mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .........
PAGE 3
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover ELECTRICAL CHARACTERISTICS (continued) (VIN = +19V, TA = -40°C to +85°C, unless otherwise noted, CVDD = 100nF. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GATE1 Leakage Current G1ILKG VOVS > OVREF, VUVS < UVREF, or VCB = +5V -1 +1 µA GATE2 Leakage Current G2ILKG VCB = 0V -1 +1 µA CB Logic-Level High VIH Logic-Level Low VIL CB Pulldown Resistor 1.5 RCBPD V 0.
PAGE 4
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Typical Operating Characteristics (continued) (VOVLO = 22.2V and VUVLO = 10.1V, R1 = 887kΩ, R2 = 66.5kΩ, R3 = 54.9kΩ, all resistors 1%, OVREF = UVREF = 1.228V.) BATTERY SWITCHOVER WITH ADAPTERPLUGGED RESPONSE (VIN = 19V, VGATE2-PULLUP = 4.2V, RPULLUP = 5kΩ) 20 VGATE1 VIN VOLTAGE (V) VOLTAGE (V) 9 7 5 4 3 VGATE1 15 2 VOLTAGE (V) 11 5 MAX4959/60 toc05 25 MAX4959/60 toc04 13 OVERVOLTAGE AND UNDERVOLTAGE TRIP DIFFERENCE vs.
PAGE 5
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Pin Description PIN MAX4959 MAX4960 1 1 NAME GATE1 FUNCTION pFET Gate Drive Output Open Drain. GATE1 is actively driven low, except during fault (OVP or UVP) condition (the external pFET is turned off). When VUVLO < VIN < VOVLO, GATE1 is driven low (the external pFET P1 is turned on). 2, 9 9 N.C. — 2 SOURCE1 pFET Source Output. An internal resistor is connected between SOURCE1 and GATE1. 3 3 IN Voltage Input.
PAGE 6
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Functional Diagrams Functional Diagram for the MAX4959 GATE1 IN GATE2 N1 VSG + N2 BANDGAP N - VDD ANALOG SUPPLY CB DIGITAL SUPPLY POWER ON + VREF2 = 0.7V + VDD UVLO POWER-ON RESET AND OFF STORAGE LOGIC VREF1 = 2V GND + OVS + OVLO - UVS + MAX4959 no blanking time for OVP, but the debounce time applies once the IN voltage falls below V OVLO but above VUVLO.
PAGE 7
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Functional Diagrams (continued) Functional Diagram for the MAX4960 IN SOURCE1 GATE1 GATE2 N2 VSG + BANDGAP N - VDD N1 ANALOG SUPPLY CB DIGITAL SUPPLY POWER ON + VREF2 = 0.7V + VDD UVLO POWER-ON RESET AND OFF STORAGE LOGIC VREF1 = 2V GND + OVS + OVLO - UVS + MAX4960 only if the backup capacitor on VDD is large enough to maintain power for greater than the 10ms blanking time.
PAGE 8
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover VIN VOVLO VOVLO VUVLO tDEB tDEB INTUVREF tBLANK VUVLO tDEB tBLANK VGATE1 VDD VDD REGULATED VCB VGATE2 Figure 1.
PAGE 9
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover 4 [VOVLO / VUVLO]MAX ≤ 4 Applications Information MOSFET Configuration and Selection The MAX4959/MAX4960 are used with a single MOSFET configuration as shown in the Typical Operating Circuits to regulate voltage as a low-cost solution. The MAX4959/MAX4960 are designed with pFETs. For lower on-resistance, the external MOSFET can be multiple pFETs in parallel. In most situations, MOSFETs with RDS(ON) specified for a VGS of 4.5V work well.
PAGE 10
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover RC 1MΩ CHARGE-CURRENTLIMIT RESISTOR RD 1.5kΩ IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 2. Human Body ESD Test Model tRL TIME tDL CURRENT WAVEFORM Figure 3.
PAGE 11
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Typical Operating Circuits D1 DC-DC CONVERTER AC ADAPTER P1 C1 RU1 C2 RD1 IN RU2 GATE1 RD2 BATTERY CHARGER VSUPPLY GATE2 N2 VDD HOLD-UP POWER SUPPLY N1 P2 CB VREF R1 UVS UVLO GND R2 LOGIC OVS OVLO R3 1-CELL (4.2V) TO 4-CELL (16.8V) Figure 4.
PAGE 12
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Typical Operating Circuits (continued) 28V PROTECTED CHARGER AC ADAPTER DC-DC CONVERTER EN 3.3V RD1 IN GATE1 VSUPPLY SYSTEM LOAD GATE2 N2 VDD HOLD-UP POWER SUPPLY CB N1 VREF R1 UVS UVLO GND R2 LOGIC OVS OVLO R3 1-CELL (4.2V) TO 4-CELL (16.8V) Figure 5.
PAGE 13
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Typical Operating Circuits (continued) DC-DC CONVERTER AC ADAPTER P1 C1 C2 IN SOURCE1 RU2 GATE1 RD2 BATTERY CHARGER VSUPPLY GATE2 N2 VDD HOLD-UP POWER SUPPLY P2 CB N1 VREF R1 UVS UVLO GND R2 LOGIC OVS OVLO R3 1-CELL (4.2V) TO 4-CELL (16.8V) Figure 6.
PAGE 14
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Typical Operating Circuits (continued) BATTERY CHARGER AC ADAPTER P1 C1 DC-DC CONVERTER IN GATE1 SOURCE1 VSUPPLY SYSTEM LOAD GATE2 N2 VDD HOLD-UP POWER SUPPLY CB N1 VREF R1 UVS UVLO GND R2 LOGIC OVS OVLO 1-CELL (4.2V) TO 4-CELL (16.8V) R3 Figure 7. MAX4960 Typical Operating Circuit 2 Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
PAGE 15
MAX4959/MAX4960 High-Voltage OVP with Battery Switchover Revision History REVISION NUMBER REVISION DATE 0 7/07 Initial release 1 7/14 Removed µMAX products for MAX4959 and MAX4960 DESCRIPTION PAGES CHANGED — Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.