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MAX1684EEE+ |MAX1684EEEMAXN/a273avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1684EEE+ |MAX1684EEEMAXINN/a26avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1684EEE+ |MAX1684EEEMAXIMN/a45avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1684EEE+T |MAX1684EEETMAXIMN/a30000avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1684EEE-T |MAX1684EEETMAXIMN/a228avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1685EEE+MAXIMN/a21avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1685EEE+ |MAX1685EEEMAXINN/a50avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1685EEE+ |MAX1685EEEMAXN/a1070avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX1685EEE+T |MAX1685EEETMAXIMN/a3761avaiLow-Noise, 14V Input, 1A, PWM Step-Down Converters


MAX1684EEE+T ,Low-Noise, 14V Input, 1A, PWM Step-Down ConvertersFeaturesThe MAX1684/MAX1685 are high-efficiency, internal-♦ Up to 96% Efficiencyswitch, pulse-width ..
MAX1684EEE-T ,Low-Noise, 14V Input, 1A, PWM Step-Down ConvertersELECTRICAL CHARACTERISTICS(V = V = 6V, STBY = SYNC/PWM = CVL, V = V , FB = AGND, circuit of Figure ..
MAX1685EEE ,Low-Noise / 14V Input / 1A / PWM Step-Down Convertersapplications thatrequire highest efficiency. The MAX1685 runs at' Small 16-QSOP Package600kHz to al ..
MAX1685EEE ,Low-Noise / 14V Input / 1A / PWM Step-Down ConvertersELECTRICAL CHARACTERISTICS(V = V = +6V, STBY = SYNC/PWM = CVL, V = V , FB = AGND, circuit of Figure ..
MAX1685EEE ,Low-Noise / 14V Input / 1A / PWM Step-Down ConvertersApplicationsINPUT OUTPUTCellular Phones3.3V AT 1A2.7V TO 14V2-Way Radios and Walkie-Talkies IN LX+ ..
MAX1685EEE ,Low-Noise / 14V Input / 1A / PWM Step-Down ConvertersMAX1684/MAX168519-1454; Rev 0; 4/99Low-Noise, 14V Input, 1A, PWM Step-Down Converters
MAX4480AXK+T ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with ShutdownElectrical Characteristics(V = +5V, V = 0V, V = 0V, V = V /2, R ≥ 1MΩ connected to V /2, SHDN = V ( ..
MAX4480AXK-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with Shutdownapplications. 0.005% THD with 100kΩ LoadThe MAX4480 is a single amplifier offered in a tiny 5-pinS ..
MAX4481AXT-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with ShutdownFeaturesThe MAX4480–MAX4483 low-cost, general-purpose op Single +2.5V to +5.5V Supply Voltage Rang ..
MAX4482AKA+T ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with ShutdownFeatures● Single +2.5V to +5.5V Supply Voltage RangeThe MAX4480–MAX4483 low-cost, general-purpose o ..
MAX4482AKA-T ,Single/Dual/Quad / Low-Cost / Single-Supply / Rail-to-Rail Op Amps with ShutdownELECTRICAL CHARACTERISTICS(V = +5V, V = 0, V = 0, V = V /2, R ≥ 1MΩ connected to V /2, SHDN = V (MA ..
MAX4482ASA+ ,Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with ShutdownApplicationsMAX4481AUT+T -40°C to +125°C 6 SOT23 AAOS● Single-Supply Zero-Crossing Detectors● Instr ..


MAX1684EEE+-MAX1684EEE+T-MAX1684EEE-T-MAX1685EEE+-MAX1685EEE+T
Low-Noise, 14V Input, 1A, PWM Step-Down Converters
General Description
The MAX1684/MAX1685 are high-efficiency, internal-
switch, pulse-width modulation (PWM) step-down switch-
ing regulators intended to power cellular phones,
communicating PDAs, and handy-terminals. These
devices deliver a guaranteed 1A output current from two
lithium-ion (Li+) batteries. Their wide-input voltage range
of 2.7V to 14V gives design flexibility and allows batteries
to charge from a wall cube, since the ICs operate at the
higher voltages that occur when the battery is removed.
The output voltage is preset to 3.3V or can be externally
adjusted from 1.25V to VIN.
The low on-resistance power switch and built-in synchro-
nous rectifier provide high efficiencies of up to 96%.
There are four modes of operation: fixed-frequency, nor-
mal, low-power, and shutdown. The fixed-frequency
PWM mode of operation offers excellent noise character-
istics. The normal mode maintains high efficiency at all
loads. The low-power mode is used to conserve power in
standby or when full load is not required. The shutdown
mode is used to power down the device for minimal cur-
rent draw.
The MAX1684 runs at 300kHz for applications that
require highest efficiency. The MAX1685 runs at
600kHz to allow the use of smaller external compo-
nents. These devices can also be synchronized to an
external clock. Other features include a 100% duty
cycle for low-dropout applications, an auxiliary 3V/5mA
output, and a 1% accurate reference.
Both devices are available in a space-saving 16-QSOP
package. An evaluation kit is also available to help
speed designs. For a similar device in a 10-pin µMAX
package with lower input voltage requirements (5.5V
max), refer to the MAX1692 data sheet.
Applications

Cellular Phones
Two-Way Radios and Walkie-Talkies
Computer Peripherals
Personal Communicators
PDAs and Handy-Terminals
Features
Up to 96% Efficiency1A Guaranteed Output Current100% Duty Cycle in Dropout 2.7V to 14V Input Range (15V Absolute Max)±1% Accurate Reference Output 0.24ΩP-Channel On-ResistanceSynchronizable Switching FrequencyFixed-Frequency PWM Operation
300kHz (MAX1684)
600kHz (MAX1685)
150µA Normal-Mode Quiescent Current25µA Low-Power Mode Quiescent Current2µA Shutdown CurrentDual Mode™Fixed 3.3V (±1%) Output or
Adjustable Output (1.25V to VIN)
Small 16-QSOP PackageAuxiliary Output (CVL): 3V/5mA
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters

MAX1684
MAX1685IN
AIN
GND
OUTPUT
3.3V AT 1A
INPUT
2.7V TO 14V
BOOT
SHDN
CVH
CVL
STBY
SYNC/PWMCCREF+
19-1454; Rev 2; 7/01
PART
MAX1684EEE
MAX1685EEE
-40°C to +85°C
-40°C to +85°C
TEMP RANGEPIN-PACKAGE

16 QSOP
16 QSOP
EVALUATION KIT
AVAILABLE
Typical Operating Circuit
Ordering Information
Pin Configuration appears at end of data sheet.

Dual Mode is a trademark of Maxim Integrated Products, Inc.
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= VSHDN= 6V, STBY= SYNC/PWM = CVL, VBOOT= VOUT, FB = AGND, circuit of Figure 1, 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.
AIN to AGND............................................................-0.3 to +15V
IN to PGND................................................-0.3V to (VAIN+ 0.3V)
LX to PGND.................................................-0.5V to (VIN+ 0.3V)
PGND to AGND..................................................................±0.3V
SHDNto AGND.........................................-0.3V to (VAIN+ 0.3V)
ILIM/SS, FB, CC, BOOT, REF to AGND....-0.3V to (VCVL+ 0.3V)
CVH to IN..................................................................-6V to +0.3V
CVL, STBY, SYNC/PWM to AGND............................-0.3V to +6V
Reference Current..............................................................±1mA
CVL Current .......................................................-1mA to +10mA
LX Peak Current (Internally Limited).....................................2.3A
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
VFB= VOUT, ILOAD= 0 to 1A
Low-power mode, STBY= low,
VBOOT= 3.3V (Note 2)
Normal mode, SYNC/PWM = low,
VBOOT= 3.3V (Note 2)
PWM mode,
SYNC/PWM = high,
VBOOT= 3.3V
(Note 2)
SYNC/PWM = high
Low-side switch, VIN= 2.7V, ILX= 200mA
High-side switch,
ILX= 1A
VFB= VOUT, ILOAD= 0 to 1A
VIN= 5V to 14V
BOOT = AGND (Note 1)
SYNC/PWM = low
VFB= 1.4V
CONDITIONS

Quiescent Power Consumption
0.9265332080130Zero Crossing Threshold-1050100VFBFeedback Voltage1.2381.2511.2642.714Input Voltage Range0.150.40.9Current Limit, N-Channel1.21.752.3ILIMCurrent Limit in PWM Mode38On-Resistance, N-Channel
0.240.50.01Output Load Regulation1Output Current CapabilityVREFVINOutput Adjust Range-5050IFBFB Input Current
UNITSMINTYPMAXSYMBOLPARAMETER

FB = AGND, ILOAD= 0 to 1AVVOUTOutput Voltage (3.3V Mode)3.2963.3333.368
VIN= 6V
VIN= 2.7VΩ0.340.8On-Resistance, P-Channel
MAX1684
MAX1685
MAX1684
MAX1685
SYNC/PWM = lowmA285380475Pulse-Skipping Current Threshold
STBY= lowmA285380475ILIMLPCurrent Limit in Low-Power
Mode
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
ELECTRICAL CHARACTERISTICS (continued)

(VIN= VSHDN= 6V, STBY= SYNC/PWM = CVL, VBOOT= VOUT, FB = AGND, circuit of Figure 1, TA= 0°C to +85°C,unless otherwise
noted. Typical values are at TA= +25°C.)
STBY= low, VIN= 2.7V
CONDITIONS
230430Quiescent Supply Current
in Dropout
UNITSMINTYPMAXSYMBOLPARAMETER

SHDN= lowµA26Shutdown Supply Current
MAX1684260300340
MAX1684180350
VIN= 14V, VLX= 0 or 14V, SHDN= low
SYNC Capture Range
MAX1685kHz520600680fOSCOscillator Frequency20ILXLX Leakage Current100Maximum Duty Cycle
(Note 3)%20
MAX1685
Constant-Frequency Minimum
Duty Cycle
-1µA < IREF< 50µAmV415Reference Load Regulation
VIN= 3V to 14V, BOOT = AGND,
ICVL= 0 to 5mAV2.73.03.15
IREF= 0
CVL Regulator Output Voltage
2.7V < VBOOT< 5.5VmV0.25Reference Supply Regulation1.2381.2511.264VREFReference Output Voltage
kHz360700
MAX1684
MAX1685
BOOT = AGND, ICVL= 5mAmV120CVL Dropout Voltage
Typical hysteresis is +10°C (Note 4)°C160Thermal Shutdown Threshold
BOOT falling edge,
typical hysteresis is 0.1VV2.352.52.65BOOT Switchover Threshold
ICVH= -1mAV-5.0-4.6-4.1CVH with Respect to VIN
SHDN, STBY, SYNC/PWMV2VIHLogic Input High Voltage
VILIM/SS= 1.4VµA3.344.65ILIM/SS Source Current
High or low periodns500SYNC/PWM Pulse Width
SHDN, STBY, SYNC/PWMµA-11Logic Input Current
0.7VILLogic Input Low Voltage
BOOT = AGND, CVL falling edge,
typical hysteresis is 40mVV2.352.52.6CVL Undervoltage Lockout
Threshold
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
ELECTRICAL CHARACTERISTICS

(VIN= VSHDN= 6V, STBY= SYNC/PWM = CVL, VBOOT= VOUT, FB = AGND, circuit of Figure 1, TA= -40°C to +85°C, unless other-
wise noted.) (Note 5)
Note 1:
The output adjust range with BOOT connected to VOUTis VREFto 5.5V. Connect BOOT to AGND for VOUT> 5.5V.
Note 2:
The quiescent power-consumption specifications include chip supply and gate-drive loss only. Divide these values by VIN
(6V) to obtain quiescent currents. In normal and low-power modes, chip supply current dominates and quiescent power is
proportional to VBOOT(BOOT connected to OUT). In PWM mode, gate-drive loss dominates and quiescent power is propor-
tional to VIN✕(VIN- VCVH). In addition, IR losses in power switches and external components typically increase PWM quies-
cent power consumption by 5mW to 10mW. Note that if the device is not bootstrapped, additional power is dissipated in the
CVL linear regulator.
Note 3:
When the duty factor (VOUT/ VIN) is less than this value, the switching frequency decreases in PWM mode to maintain
regulation.
Note 4:
Thermal shutdown is disabled in low-power mode (STBY= low) to reduce power consumption.
Note 5:
Specifications to -40°C are guaranteed by design, not production tested.
CVL Undervoltage Lockout
Threshold2.42.6VBOOT = AGND, CVL falling edge,
typical hysteresis is 40mV
Logic Input Low VoltageVIL0.7
Logic Input High VoltageVIH2VSHDN, STBY, SYNC/PWM
ILIM/SS Source Current3.14.7µAVILIM/SS= 1.4V
Normal mode, SYNC/PWM = low,
VBOOT= 3.3V (Note 2)
BOOT Switchover Threshold2.352.65VBOOT falling edge, typical hysteresis is 0.1V
CVH with Respect to VIN-5.0-4.1VICVH= -1mA
CVL Regulator Output Voltage2.73.15VVIN= 3V to 14V, BOOT = AGND,
ICVL= 0 to 5mA
Reference Output Voltage1.2321.268VIREF= 0
Oscillator FrequencyfOSC480700kHzMAX1685
240350MAX1684
Shutdown Supply Current6µASHDN= low
Quiescent Power Consumption
Current Limit in Low-Power
ModeILIMLP285475mASTBY= low
Output Voltage (3.3V Mode)VOUT3.2803.382V
PARAMETERSYMBOLMINMAXUNITS

FB Input CurrentIFB-5050nA
Output Adjust RangeVREFVINV
Output Current Capability1A
Input Voltage Range2.714V
Output Feedback VoltageVFB1.2331.269V
Current Limit in PWM ModeILIM1.22.3A
CONDITIONS

VFB= 1.4V
BOOT = AGND (Note 1)
VIN= 6V to 14V
FB = AGND, ILOAD= 0 to 1A
VFB= VOUT, ILOAD= 0 to 1A
Low-power mode, STBY= low,
VBOOT= 3.3V (Note 2)
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters

0.1110100100010,000
MAX1684
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V, VOUT = 1.8V, 2.5V)

MAX1684/85 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)40
A: VOUT = 2.5V LP MODE
B: VOUT = 1.8V LP MODE
C: VOUT = 2.5V NORM MODE
D: VOUT = 1.8V NORM MODE
E: VOUT = 2.5V PWM MODE
F: VOUT = 1.8V PWM MODED
0.1110100100010,000
MAX1684
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)

MAX1684/85 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)40
A: VIN = 4V LP MODE
B: VIN = 12V LP MODE
C: VIN = 4V NORMAL MODE
D: VIN = 12V NORMAL MODEA10010100010,000
MAX1684
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V, PWM MODE)

MAX1684/85 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
A: VIN = 4V
B: VIN = 5V
C: VIN = 9V
D: VIN = 12V
0.1110100100010,000
MAX1684
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V)

MAX1684/85 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)50
A: VIN = 6V LP MODE
B: VIN = 9V LP MODE
C: VIN = 12V LP MODE
D: VIN = 6V NORMAL MODE
E: VIN = 9V NORMAL MODE
F: VIN = 12V NORMAL MODE
0.1110100100010,000
MAX1685
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)

MAX1684/85 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)40
A: VIN = 4V LP MODE
B: VIN = 12V LP MODE
C: VIN = 4V NORMAL MODE
D: VIN = 12V NORMAL MODE10010100010,000
MAX1684
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V, PWM MODE)

MAX1684/85 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
A: VIN = 6V
B: VIN = 9V
C: VIN =12V B10010100010,000
MAX1685
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V, PWM MODE)

MAX1684/85 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 5V
VIN = 9V
VIN = 12V
VIN = 4V10010100010,000
MAX1685
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V PWM MODE)

MAX1684/85 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
100VIN = 6V
VIN = 9V
VIN =12V
0.1110100100010,000
MAX1685
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V)

MAX1684/85 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)40
A: VIN = 6V LP MODE
B: VIN = 9V LP MODE
C: VIN = 12V LP MODE
D: VIN = 6V NORMAL MODE
E: VIN = 9V NORMAL MODE
F: VIN =12V NORMAL MODEEDC
Typical Operating Characteristics

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
Typical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
MAX1684/85 toc10
INPUT VOLTAGE (V)
LOAD CURRENT (A)
PWM OR NORMAL MODE
SAFE OPERATING AREA
MAX1684/85 toc11
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
VOUT = 3.3V
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX1684/85 toc12
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
VOUT = 3.3V
VOUT = 5V
INDUCTOR RESISTANCE INCLUDED
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1684/85 toc13
INPUT VOLTAGE (V)
SUPPLY CURRENT (
NORMAL MODE
LOW-POWER MODE
ILOAD
500mA/div
VOUT
50mV/div
2ms/div
LOAD-TRANSIENT RESPONSE

MAX1684/85 toc16
MAX1684, ILOAD = 0.1mA TO 1A, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V
MAX1684
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(VOUT = 3.3V, PWM MODE)
MAX1684/85 toc14
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
PWM FIXED-FREQUENCY
OPERATION AREA
M AX1684/85 toc15
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
MAX1685
MAX1684
VOUT
20mV/div
ILX
100mA/div
1μs/div
SWITCHING WAVEFORM

MAX1684/85 toc17
MAX1684, ILOAD = 100mA, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V
VLX
5V/div
ILX
100mA/div
1μs/div
SWITCHING WAVEFORM

MAX1684/85 toc18
MAX1684, ILOAD = 100mA, VOUT = 3.3V, VIN = 5V,
SYNC/PWM = 3.3V
MAX1684/MAX1685
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
Pin Description
Typical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
VIN
5V/div
VOUT
100mV/div
2ms/div
LINE-TRANSIENT RESPONSE

MAX1684/85 toc19
MAX1684, ILOAD = 100mA, VIN = 5V TO 10V,
SYNC/PWM = 3.3V
VSHDN
5V/div
IIN
50mA/div
10ms/div
STARTUP CURRENT

MAX1684, ILOAD = 100mA, VOUT = 3.3V,
VIN = 5V, CILIM/SS = 0.1μF, SYNC/PWM = 3.3V
MAX1684/85 toc20
PIN

High-Side MOSFET Gate Bias. Bias voltage for P-channel switch. Bypass to IN with a 0.1µF capacitor.CVH1
FUNCTIONNAME

Analog Supply Voltage Input. Connect to IN with a 0.2in metal trace. Bypass to PGND with a 0.1µF
capacitor.AIN2
Logic Supply Voltage Output and IC Logic Supply. Sources 5mA for external loads. Bypass to AGND
with 1µF capacitor.CVL4
Supply Voltage InputIN3
Reference Output. 1.25V reference output supplies 10µA for external loads. Bypass to AGND with 0.1µF
capacitor.REF6
Integrator Capacitor Connection. Connect a 0.01µF capacitor to AGND.CC8
Dual-Mode Feedback Input. Connect FB to VOUTfor 1.25V output. Connect to an external resistor divider
to adjust the output voltage. Connect to AGND to set output voltage to 3.3V.FB7
Analog GroundAGND5
Current-Limit Adjust/Soft-Start Input. See the Current Limit and Soft-Startsection.ILIM/SS10
Bootstrap Input. Connection for the bootstrap switch and internal feedback path. Connect BOOT to VOUT
for VOUT< 5.5V. Connect BOOT to AGND for VOUT> 5.5V.BOOT12
Standby Control Input. Connect to CVL for normal operation. Connect to AGND for low-power mode
(Table 1). This pin overrides SYNC/PWM setting.STBY11
Active-Low Shutdown Input. Connect to ground for shutdown. SHDNcan withstand the input voltage.SHDN15
Power GroundPGND16
Inductor Connection. Drain for internal P-channel MOSFETs. Connect inductor from LX to OUT.LX13, 14
SYNC/PWM Input:
For synchronized-PWM operation, drive with TTL level, 50% square wave.
Connect to CVL for PWM mode.
Connect to AGND for normal mode.
SYNC/PWM9
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