ANUAL LUATIO SHEET FOLLO Low-Noise, 5.5V-Input, Step-Down Regulat
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19-1400; 11/98
ANUAL LUATIO SHEET FOLLO
Low-Noise, 5.5V-Input, Step-Down Regulator
+2.7V +5.5V Input Range Adjustable Output from 1.25V 600mA Guaranteed Output Current Efficiency Schottky Diode Required 85µA Quiescent Current 100% Duty Cycle Dropout 750kHz Fixed-Frequency Operation Synchronizable Switching Frequency Accurate Reference: 1.25V (±1.2%) Small 10-Pin µMAX Package
General Description
MAX1692 low-noise, pulse-width-modulated (PWM), DC-DC step-down converter. powers logic transmitters small wireless systems such cellular phones, communicating PDAs, handy-terminals. device features internal synchronous rectifier high efficiency; requires external Schottky diode. Excellent noise characteristics fixed-frequency operation provide easy post-filtering. MAX1692 ideally suited Li-Ion battery applications. also useful fixed input applications. device operates four modes. Forced mode operates fixed frequency regardless load. Synchronizable mode allows external switching frequency control minimize harmonics. Idle Mode(PWM/PFM) extends battery life switching pulse-skipping mode during light loads. Shutdown mode places device standby, reducing quiescent supply current under 0.1µA. MAX1692 deliver over 600mA. output voltage adjusted from 1.25V with input range +2.7V +5.5V. Other features MAX1692 include high efficiency, dropout voltage, 1.2%-accurate 1.25V reference. available space-saving 10-pin µMAX package with height only 1.11mm.
MAX1692
Ordering Information
PART MAX1692EUB TEMP. RANGE -40°C +85°C PIN-PACKAGE µMAX
Configuration
VIEW
PGND SHDN SYNC/PWM
Applications
Cellular Phones Cordless Phones Supplies Notebook Chipset Supplies
MAX1692
PDAs Handy-Terminals Battery-Operated Devices Li-Ion NiMH/NiCd)
µMAX
Typical Operating Circuit
2.7V 5.5V SHDN VOUT 1.25V
MAX1692
AGND
SYNC/PWM PGND
Idle Mode trademark Maxim Integrated Products.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
ABSOLUTE MAXIMUM RATINGS
SHDN, SYNC/PWM, -0.3V .-0.3V +0.3V PGND -0.3V +0.3V PGND. -0.3V (VIN 0.3V) -0.3V (VBP 0.3V) Reference Current ±1mA Peak Current (internally limited). 1.6A Continuous Power Dissipation +70°C) 10-Pin µMAX (derate 5.6mW/°C above +70°C) .444mW Operating Temperature Range -40°C +85°C Maximum Junction Temperature +150°C Storage Temperature Range -65°C +160°C Lead Temperature (soldering, 10sec) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN +3.6V, SYNC/PWM GND, VLIM 3.6V, SHDN circuit Figure +85°C, unless otherwise noted. Typical values +25°C.) PARAMETER Input Voltage Range SYMBOL OUT, VLIM 2.7V 5.5V, IOUT Output Voltage VOUT OUT, 2.7V 5.5V, IOUT 600mA, IOUT 250mA, (Note OUT, VLIM 5.5V, IOUT (duty cycle 23%) (Note Duty cycle 100% IOUT 600mA, IOUT 250mA, PRDS(ON) NRDS(ON) 1.4V 180mA 180mA 3.6V 2.7V 3.6V 2.7V 0.35 0.75 -450 SYNC/PWM GND, 1.4V, unconnected SHDN GND, includes leakage current 5.5V, 5.5V fOSC dutyMAX dutyMIN VREF IREF 1.235 1.250 1.265 CONDITIONS 1.223 1.249 1.275 1.190 VREF 1.223 1.249 -1.3 0.01 -850 0.65 0.85 1.55 -1600 1000 1.232 1.275 1.275 UNITS
Output Adjustment Range Feedback Voltage Line Regulation Load Regulation Input Current P-Channel On-Resistance N-Channel On-Resistance P-Channel Current-Limit Threshold N-Channel Current-Limit Threshold Pulse-Skipping Current-Limit Threshold Quiescent Current Shutdown Supply Current Leakage Current Oscillator Frequency SYNC Capture Range Maximum Duty Cycle Minimum Duty Cycle Reference Output Voltage
1.4V SYNC/PWM
Low-Noise, 5.5V-Input, Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN +3.6V, SYNC/PWM GND, VLIM 3.6V, SHDN circuit Figure +85°C, unless otherwise noted. Typical values +25°C.) PARAMETER Reference Load Regulation Undervoltage Lockout Threshold Logic Input High Logic Input Logic Input Current SYNC/PWM Minimum Pulse Width UVLO SYMBOL IREF 50µA rising, typical hysteresis 85mV SHDN, SYNC/PWM, SHDN, SYNC/PWM, SHDN, SYNC/PWM, High CONDITIONS UNITS
MAX1692
ELECTRICAL CHARACTERISTICS
(VIN +3.6V, SYNC/PWM GND, VLIM 3.6V, SHDN circuit Figure -40°C +85°C, unless otherwise noted.) (Note PARAMETER Input Voltage Range SYMBOL OUT, VLIM 2.7V 5.5V, IOUT Output Voltage VOUT OUT, 2.7V 5.5V, IOUT 600mA, IOUT 250mA, (Note OUT, VLIM 5.5V, IOUT (duty cycle 23%) (Note =1.4V SYNC/PWM SYNC/PWM GND, unconnected, 1.4V SHDN GND, includes leakage current fOSC VREF UVLO IREF rising, typical hysteresis 85mV SHDN, SYNC/PWM, SHDN, SYNC/PWM, SHDN, SYNC/PWM, 1.230 CONDITIONS 1.213 1.285 1.185 1.213 1.285 1.285 1.268 UNITS
Output Adjustment Range Feedback Voltage Input Current P-Channel Current-Limit Threshold N-Channel Current-Limit Threshold Quiescent Current Shutdown Supply Current Oscillator Frequency Reference Output Voltage Undervoltage Lockout Threshold Logic Input High Logic Input Logic Input Current
Note Guaranteed minimum maximum duty-factor tests. Note following equation used calculate accuracy output voltages other than 1.232V: (see Feedback Voltage Load Current) (NOMINAL) (Line Reg) (VOUT 0.23) 0.77 (Load Reg)(IOUT IRIPPLE) IMAX where: Line line regulation Load load regulation IRIPPLE VOUT VIN) VOUT (fOSC where inductor value IMAX 250mA (LIM GND) 600mA (LIM Note Specifications -40°C guaranteed design, production tested.
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
Typical Operating Characteristics
(SYNC/PWM GND, circuit Figure Sumida CD43-100, +25°C, unless otherwise noted.)
DROPOUT VOLTAGE LOAD CURRENT
MAX1692-01
EFFICIENCY LOAD CURRENT (VOUT 3.3V)
MAX1692-02
EFFICIENCY LOAD CURRENT (VOUT 2.5V)
EFFICIENCY
MAX1692-03
DROPOUT VOLTAGE (mV) VOUT 2.5V
EFFICIENCY 505k 301k 5.0V 3.6V
5.0V 3.6V
2.7V
VOUT 3.3V
309k 301k 1000
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY LOAD CURRENT (VOUT 1.8V)
MAX1692-04
FEEDBACK VOLTAGE LOAD CURRENT
MAX1692-05
BATTERY INPUT CURRENT INPUT VOLTAGE
BATTERY INPUT CURRENT (µA) -40°C VOUT 1.8V SYNC/PWM +25°C
MAX1692-06
EFFICIENCY 3.6V 5.0V 2.7V
1.25 1.245 1.24 VOLTAGE 1.235 1.23 1.225 1.22 1.215 5.0V 309k 301k SYNC/PWM
+85°C
1000 LOAD CURRENT (mA) 138k 301k
1.21 1.205 1000 LOAD CURRENT (mA)
INPUT VOLTAGE
BATTERY INPUT CURRENT INPUT VOLTAGE
MAX1692-07
BATTERY INPUT CURRENT INPUT VOLTAGE TEMPERATURE
MAX1692-09
OUTPUT VOLTAGE LOAD CURRENT
2.7V VOUT 1.8V 138k 301k
MAX1692-10
BATTERY INPUT CURRENT (mA) SYNC/PWM VOUT 1.8V VOUT 2.5V VOUT 3.3V
BATTERY INPUT CURRENT (mA)
1.84
OUTPUT VOLTAGE
+85°C
1.82
1.80
+25°C -40°C VOUT 1.8V SYNC/PWM
1.78
1.76
1.74 LOAD CURRENT (mA) INPUT VOLTAGE
INPUT VOLTAGE
Low-Noise, 5.5V-Input, Step-Down Regulator
Typical Operating Characteristics (continued)
(SYNC/PWM GND, +25°C, unless otherwise noted.)
MAX1692
OSCILLATOR FREQUENCY SUPPLY VOLTAGE
MAX1692-11
MAXIMUM OUTPUT CURRENT INPUT VOLTAGE
MAX1692-12
START-UP FROM SHUTDOWN
VSHDN 2V/div
MAX1692-14
+85°C OSCILLATOR FREQUENCY (kHz) +25°C -40°C IOUT 200mA
MAXIMUM OUTPUT CURRENT
VOUT 1V/div VOUT 1.8V 2ms/div INPUT VOLTAGE 0.5A/div
SUPPLY VOLTAGE
HEAVY LOAD SWITCHING WAVEFORMS
MAX1692-15
LOAD-TRANSIENT RESPONSE
MAX1692-17
LINE-TRANSIENT RESPONSE
ACCOUPLED 2V/div VOUT ACCOUPLED 50mV/div
MAX1692-18
5V/div 0.5A/div
5V/div
IOUT 2.5A/div VOUT ACCOUPLED 100mV/div VOUT AC-COUPLED 100mV/div 2ms/div VOUT 3.3V, IOUT 700mA 500µs/div ILOAD 30mA 700mA
2ms/div IOUT 300mA
RECOVERY FROM 100% DUTY CYCLE
MAX1692-19
SWITCHING HARMONICS NOISE
MAX1692-22
2V/div
5V/div VOUT ACCOUPLED 500mV/div
1mV/div
2ms/div 3.3V 4.5V VOUT 3.3V, IOUT 500mA
100kHz IOUT 500mA
1MHz 1ms/div
10MHz
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
Description
NAME SYNC/ SHDN PGND FUNCTION Supply Voltage Input. Input range from +2.7V +5.5V. Bypass with 10µF capacitor. Supply Bypass Pin. Internally connected Bypass with 0.1µF capacitor. connect external power source other than Ground 1.25V, 1.2% Reference Output. Capable delivering 50µA external loads. Bypass with 0.22µF capacitor GND. Feedback Input Current-Limit Select Input. Connect 0.6A current limit 1.2A current limit. Oscillator Sync Low-Noise, Mode-Control Input. SYNC/PWM (Forced Mode) SYNC/PWM (PWM/PFM Mode) external clock signal connected this allows switching synchronization. Active-Low, Shutdown-Control Input. Reduces quiescent current 0.1µA. shutdown, output becomes high impedance. Inductor Connection Drains Internal Power MOSFETs Power Ground
CHIP SUPPLY CURRENT COMPARATOR SHDN
MAX1692
12mV 120mV COMPARATOR 0.1X
SENSE COMPARATOR CONTROL DRIVER LOGIC SIGNAL COMPARATOR OVERVOLTAGE COMPARATOR NEGLIM COMPARATOR ADJ. 40mV PGND
RAMP SYNC CELL SLOPE COMPENSATION
SENSE 0.1X
SYNC/
Figure Simplified Functional Diagram
Low-Noise, 5.5V-Input, Step-Down Regulator
Detailed Description
MAX1692 step-down, pulse-width-modulated (PWM), DC-DC converter adjustable output range from 1.25V input voltage. internal synchronous rectifier improves efficiency eliminates external Schottky diode. Fixed-frequency operation enables easy post-filtering, thereby providing excellent noise characteristics. result, MAX1692 ideal choice many small wireless systems. MAX1692 accepts inputs +2.7V while still delivering 600mA. MAX1692 operate four modes optimize performance. forced (PWM) mode switches fixed frequency, regardless load, easy post-filtering. synchronizable mode uses external clock minimize harmonics. PWM/PFM mode extends battery life operating mode under heavy loads mode under light loads reduced power consumption. Shutdown mode reduces quiescent current 0.1µA.
+2.7V +5.5V 10µF 47µF 10µH VOUT 1.8V 600mA
MAX1692
MAX1692
ON/OFF 0.22µF SHDN 0.1µF SYNC/ PGND 47pF 300k 138k
Control Scheme
MAX1692 uses slope-compensated, currentmode controller capable achieving 100% duty cycle. device uses oscillator-triggered, minimum on-time, current-mode control scheme. minimum on-time approximately 150ns unless dropout. maximum on-time approximately 2/fOSC, allowing operation 100% duty cycle. Current-mode feedback provides cycle-by-cycle current limiting superior load- line-response protection internal MOSFET rectifier. each falling edge internal oscillator, SYNC cell sends signal control drive logic, turning internal P-channel MOSFET (main switch) (Figure This allows current ramp through inductor (Figure load, stores energy magnetic field. switch remains until either current-limit (LIM) comparator tripped comparator signals that output regulation. When switch turns during second half each cycle, inductor's magnetic field collapses, releasing stored energy forcing current through N-channel synchronous rectifier output-filter capacitor load. output-filter capacitor stores charge when inductor current high releases when inductor current low, thus smoothing voltage across load. During normal operation, MAX1692 regulates output voltage switching constant frequency then modulating power transferred load each cycle using comparator. multi-input comparator sums three weighted differential signals:
Figure Standard Application Circuit
output voltage with respect reference, main switch current sense, slope-compensation ramp. modulates output power adjusting inductor-peak current during first half each cycle, based output-error voltage. MAX1692's loop gain relatively enable small, lowvalued output-filter capacitor. resulting load regulation 1.3% (typ) 600mA.
100% Duty-Cycle Operation
maximum on-time exceed internal oscillator cycle, which permits operation 100% duty cycle. input voltage drops, duty cycle increases until P-channel MOSFET held continuously. Dropout voltage 100% duty cycle output current multiplied on-resistance internal switch inductor, around 280mV 600mA). mode, subharmonic oscillation occur near dropout subharmonic voltage ripple small, since ripple current low.
Synchronous Rectification
N-channel, synchronous-rectifier improves efficiency during second half each cycle (off time). When inductor current ramps below threshold NEGLIM comparator (Figure when reaches oscillator period, synchronous rectifier turns off. This keeps excess current from flowing backward through inductor, from output-filter capacitor GND, through switch synchronous rectifier GND. During operation, NEGLIM threshold adjusts permit small
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
amounts reverse current flow from output during light loads. This allows regulation with constantswitching frequency eliminates minimum load requirements. NEGLIM comparator threshold 50mA 1.25V, decreases exceeds 1.25V prevent output from rising. NEGLIM threshold mode fixed 50mA. (See Forced PWM/PFM Operation section.)
SYNC Input Frequency Control
MAX1692's internal oscillator fixedswitching frequency 750kHz synchronized external clock. Connect SYNC forcedPWM operation. leave SYNC/PWM unconnected. Connecting SYNC/PWM enables PWM/PFM operation reduce supply current light loads. SYNC/PWM negative-edge triggered input that allows synchronization external frequency ranging between 500kHz 1000kHz. When SYNC/PWM clocked external signal, converter operates forced mode. SYNC high more than 100µs, oscillator defaults 750kHz.
Forced PWM/PFM Operation
Connect SYNC/PWM normal forced operation. Forced operation desirable sensitive data-acquisition applications, ensure that switching-noise harmonics interfere with sensitive data-sampling frequencies. minimum load required during forced operation, since synchronous rectifier passes reverse-inductor current needed allow constant-frequency operation with load. Forced operation uses higher supply current with load (2mA typ). Connecting SYNC/PWM enables PWM/PFM operation. This proprietary control scheme overrides mode places MAX1692 mode light loads improve efficiency reduce quiescent current 85µA. With PWM/PFM enabled, MAX1692 initiates pulse-skipping operation when peak inductor current drops below 120mA. During operation, MAX1692 switches only needed service load, reducing switching frequency associated losses internal switch, synchronous rectifier, external inductor. During mode, switching cycle initiates when comparator senses that output voltage dropped low. P-channel MOSFET switch turns conducts current output-filter capacitor load until inductor current reaches peak current limit (120mA). Then switch turns magnetic field inductor collapses, forcing current through synchronous rectifier output filter capacitor load. Then MAX1692 waits until comparator senses output voltage again. current comparator controls both entry into mode peak switching current during mode. Consequently, some jitter normal during transition from modes with loads around 100mA, adverse impact regulation. Output ripple higher during operation. larger output-filter capacitor used minimize ripple.
Shutdown Mode
Connecting SHDN places MAX1692 shutdown mode. shutdown, reference, control circuitry, internal switching MOSFET, synchronous rectifier turn output falls Connect SHDN normal operation.
Current-Sense Comparators
MAX1692 uses several internal current-sense comparators. operation, comparator sets cycle-by-cycle current limit (Figure provides improved load line response, allowing tighter specification inductor-saturation current limit reduce inductor cost. second 120mA current-sense comparator used across P-channel switch controls entry into mode. third current-sense comparator monitors current through internal N-channel MOSFET NEGLIM threshold determine when turn synchronous rectifier. fourth comparator (LIM) used P-channel MOSFET switch detects overcurrent. This protects system, external components, internal MOSFETs under overload conditions.
Applications Information
Output Voltage Selection
Select output voltage between 1.25V connecting resistor-divider between output (Figure Select feedback resistor 500k range. then given [(VOUT VFB) where 1.232V (See Note Electrical Characteristics). small ceramic capacitor (C5) around 47pF 100pF parallel with compensate stray capacitance output capacitor equivalent series resistance (ESR).
Low-Noise, 5.5V-Input, Step-Down Regulator
Capacitor Selection
Choose input- output-filter capacitors service inductor currents with acceptable voltage ripple. input-filter capacitor also reduces peak currents noise voltage source. addition, connect lowESR bulk capacitor (>10µF suggested) input. Select this bulk capacitor meet input ripple requirements voltage rating, rather than capacitor size. following equation calculate maximum input current: IRMS IOUT[VOUT (VIN VOUT)]1/2 When selecting output capacitor, consider output-ripple voltage approximate product ripple current output capacitor. VRIPPLE [VOUT (VIN VOUT)] fOSC(L) (VIN)] ESRC2 values met: 2VREF(1 VOUT/VIN(MIN)) (VOUT RSENSE fOSC) RESR (RSENSE)(VOUT) (VREF) where output filter capacitor, VREF internal reference voltage 1.25V, VIN(min) minimum input voltage (2.7V), RSENSE internal sense resistance 0.1, fOSC internal oscillator frequency (typically 750kHz). These equations provide minimum requirements. value need increased operation duty-cycle extremes. Tables provide recommended inductor capacitor sizes various external sync frequencies. Table lists suppliers various components used with MAX1692.
MAX1692
Standard Application Circuits
Figures standard application circuits optimized power board space respectively. circuit Figure most general two, generates 1.8V 600mA. circuit Figure optimized smallest overall size. Cellular phones using voltage baseband logic have critical area height restrictions. This circuit operates from single Li-ion battery (2.9V 4.5V) delivers 200mA 1.8V. uses small ceramic capacitors input output tiny chip inductor such NLC322522T series from TDK. With MAX1692 10-pin µMAX package, entire circuit only 60mm2 have less than 2.4mm height.
where ESRC2 equivalent-series resistance output capacitor. MAX1692's loop gain relatively low, enabling small, low-value output filter capacitors. Higher values provide improved output ripple transient response. Lower oscillator frequencies require largervalue output capacitor. When PWM/PFM used, verify capacitor selection with light loads during operation, since output ripple higher under these conditions. Low-ESR capacitors recommended. Capacitor major contributor output ripple (usually more than 60%). Ordinary aluminum-electrolytic capacitors have high should avoided. Low-ESR aluminum-electrolytic capacitors acceptable relatively inexpensive. Low-ESR tantalum capacitors better provide compact solution space-constrained surface-mount designs. exceed ripple-current ratings tantalum capacitors. Ceramic capacitors have lowest overall, OS-CONcapacitors have lowest high-value electrolytic types. generally necessary ceramic OS-CON capacitors MAX1692; consider them only very compact, high-reliability, wide-temperature applications where expense justified. When using verylow-ESR capacitors, such ceramic OS-CON, check stability while examining load-transient response. output capacitor determined ensuring that minimum capacitance value maximum
+2.9V +4.5V 4.7µF
10µH
VOUT 1.8V 200mA 10µF 10µF
MAX1692
ON/OFF 0.1µF SHDN 47pF 301k PGND 138k
SYNC/
OS-CON trademark Sanyo Corp.
Figure Miniaturized 200mA Output Circuit Fits 60mm2
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
Bypass Considerations
Bypass PGND with 10µF 47µF, respectively. Bypass with 0.1µF 0.22µF, respectively. Locate bypass capacitors close possible their respective pins minimize noise coupling. optimum performance, place input output capacitors close device feasible (see Capacitor Selection section). which result instability regulation errors. Connect inductor, input filter capacitor, output filter capacitor close together possible, keep their traces short, direct, wide. Connect their ground pins single common node star-ground configuration. external voltage-feedback network should very close pin, within 0.2in (5mm). Keep noisy traces, such from pin, away from voltage-feedback network; also keep them separate, using grounded copper. Connect PGND highest quality ground. MAX1692 evaluation manual illustrates example board layout routing scheme.
Board Layout Routing
High switching frequencies large peak currents make board layout very important part design. Good design minimizes excessive feedback paths voltage gradients ground plane, both
Table Suggested Inductors
OUTPUT VOLTAGE RANGE INDUCTOR VALUE (µH) SUGGESTED INDUCTORS Sumida CD43-100 Coilcraft D01608C-103 Sumida CD54-100 NLC322522-100T Sumida CD43-220 Sumida CD54-220 Sumida CD43-330 Sumida CD54-330
Table Component Suppliers
COMPANY Coilcraft Coiltronics Kemet Nihon Sanyo Sprague Sumida PHONE 843-946-0238 847-639-6400 561-241-7876 408-986-0424 805- 867-2555 Japan 81-3-3494-7411 619-661-6835 Japan 81-7-2070-6306 603-224-1961 847-956-0666 Japan 81-3-3607-5111 408-573-4150 847-390-4373 843-626-3123 847-639-1469 561-241-9339 408-986-1442 805- 867-2698 81-3-3494-7414 619-661-1055 81-7-2070-1174 603- 224-1430 847- 956-0702 81-3-3607-5144 408-573-4159 847-390-4428
1.25
Table Suggested Capacitors
MANUFACTURER PART NUMBER TPSD476M016R0150 Sanyo 6TPA47M Sprague 594D686X9010C2T Taiyo Yuden JMK325BJ106MN TYPE Tantalum Poscap Tantalum Ceramic
Taiyo Yuden
Low-Noise, 5.5V-Input, Step-Down Regulator
Chip Information
TRANSISTOR COUNT: 1462
MAX1692
Package Information
10LUMAXB.EPS
Low-Noise, 5.5V-Input, Step-Down Regulator MAX1692
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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