MAX1678EUA ,1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC ConverterApplicationsPART TEMP. RANGE PIN-PACKAGEPagersMAX1678EUA -40°C to +85°C 8 µMAXRemote Controls Note: ..
MAX1678EUA ,1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(V = V = 1.3V, I = 0, FB = GND, T = 0°C to +85°C, unless otherwise noted. ..
MAX1678EUA+T ,1 Cell to 2 Cell, Low-Noise, High-Efficiency, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(V = V = 1.3V, I = 0, FB = GND, T = 0°C to +85°C, unless otherwise noted. ..
MAX1678EUA+T ,1 Cell to 2 Cell, Low-Noise, High-Efficiency, Step-Up DC-DC ConverterApplicationsPART TEMP. RANGE PIN-PACKAGEPagersMAX1678EUA -40°C to +85°C 8 μMAXRemote Controls Note: ..
MAX1679EUA ,Single-Cell Li Battery Charger for Current-Limited SupplyELECTRICAL CHARACTERISTICS(V = V = +10V, V = +4.2V, TSEL = GND, GATE = unconnected, ADJ = unconnect ..
MAX1679EUA ,Single-Cell Li Battery Charger for Current-Limited SupplyApplicationsSelf-Charging Battery PacksPDAsCell PhonesTypical Operating CircuitCradle ChargersCURRE ..
MAX4447ESE+ ,6500V/µs, Wideband, High-Output-Current, Single-Ended-to-Differential Line Drivers with Enable
MAX4450EXK+T ,Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs
MAX4450EXK-T ,Ultra-Small / Low-Cost / 210MHz / Single-Supply Op Amps with Rail-to-Rail Outputs
MAX4450EXK-T ,Ultra-Small / Low-Cost / 210MHz / Single-Supply Op Amps with Rail-to-Rail Outputs
MAX4452EUK+T ,Low-Cost, +3V/+5V, 620µA, 200MHz, Single-Supply Op Amps with Rail-to-Rail OutputsApplicationsM A X43 5 2 E X K-T - 40° C to + 85° C 5 SC 70- 5 ABJM AX 4352E U K-T - 40° C to + ..
MAX4452EUK+T ,Low-Cost, +3V/+5V, 620µA, 200MHz, Single-Supply Op Amps with Rail-to-Rail OutputsELECTRICAL CHARACTERISTICS(V = +5V, V = V /2 - 0.75V, V = 0, R = ∞ to V /2, V = V /2, T = T to T , ..
MAX1678EUA
1-Cell to 2-Cell / Low-Noise / High-Efficiency / Step-Up DC-DC Converter
General DescriptionThe MAX1678 is a high-efficiency, low-voltage, syn-
chronous-rectified, step-up DC-DC converter intended
for use in devices powered by 1 to 3-cell alkaline,
NiMH, or NiCd batteries or a 1-cell lithium battery. It
guarantees a 0.87V start-up voltage and features a low
37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power
switch, a synchronous rectifier that acts as the catch
diode, a reference, pulse-frequency-modulation (PFM)
control circuitry, and circuitry to reduce inductor ring-
ing—all in an ultra-small, 1.1mm-high µMAX package.
The output voltage is preset to 3.3V or can be adjusted
from +2V to +5.5V using only two resistors. Efficiencies
up to 90% are achieved for loads up to 50mA. The
device also features an independent undervoltage
comparator (PFI/PFO) and a logic-controlled 2µA shut-
down mode.
ApplicationsPagers
Remote Controls
Pointing Devices
Personal Medical Monitors
Single-Cell Battery-Powered Devices
Features0.87V Guaranteed Start-UpUp to 90% EfficiencyBuilt-In Synchronous Rectifier (no external diode)Ultra-Small µMAX Package, 1.1mm High37µA Quiescent Current (85µA from 1.5V battery)2µA Logic-Controlled ShutdownPower-Fail DetectorDual Mode™Output:Fixed 3.3V
Adjustable 2V to 5.5V45mA Output Current at 3.3V for 1-Cell Input90mA Output Current at 3.3V for 2-Cell InputInductor-Damping Switch Suppresses EMI
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
Typical Operating Circuit
Pin Configuration
Ordering InformationDual Mode is a trademark of Maxim Integrated Products.
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VBATT= VSHDN= 1.3V, ILOAD= 0, FB = GND, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:The reverse battery current is measured from the Typical Operating Circuit’sinput terminal to GND when the battery is con-
nected backward. A reverse current of 220mA will not exceed package dissipation limits but, if left for an extended time
(more than 10 minutes), may degrade performance.
BATT, OUT,LX, SHDNto GND..............................-0.3V to +6.0V
OUT, LX Current.......................................................................1A
FB, PFI, PFO to GND................................-0.3V to (VOUT + 0.3V)
Reverse Battery Current (TA= +25°C) (Note 1)...............220mA
Continuous Power Dissipation (TA= +70°C)
µMAX (derate 4.1mW/°C above +70°C).......................330mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS(VBATT= VSHDN= 1.3V, ILOAD= 0, FB = GND, TA
= -40°C to +85°C, unless otherwise noted.) (Note 3)
Note 2:Start-up is guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-time, off-time,
and output voltage trip point).
Note 3:Specifications to -40°C are guaranteed by design and not production tested.
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
Typical Operating Characteristics(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), TA= +25°C, unless otherwise noted.)
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converterypical Operating Characteristics (continued)(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), TA= +25°C, unless otherwise noted.)
MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converterypical Operating Characteristics (continued)(Circuit of Figure 7 (Fixed Mode, 3.3V) or Figure 8 (Adjustable Mode), TA= +25°C, unless otherwise noted.)
Pin Description
LINE-TRANSIENT RESPONSEMAX1678-21
VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10μF,
L1 = SUMIDA CD43-470
A: VOUT, 50mV/div, AC COUPLED B: VIN, 1V/div, 1.2V to 2.2V
200μs/div
POWER-UP RESPONSEMAX1678-22
VOUT = 3.3V, VBATT = 1.2V, ILOAD = 10mA, COUT = 10μF,
L1 = SUMIDA CD43-470
A: VOUT, 1V/div B: INDUCTOR CURRENT, 100mA/div
C: SHDN, 5V/div
100μs/div
