MAX887HESA+-MAX887HESA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX887HESA+ ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterELECTRICAL CHARACTERISTICS(V+ = +7V, PGND = GND = 0V, SHDN = V+, (T = 0°C to T ), unless otherwise ..
MAX887HESA+ ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterFeaturesThe MAX887 high-efficiency, step-down DC-DC con-♦ 95% Efficiency verter provides an adjusta ..
MAX887HESA+T ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterApplications ______________Ordering InformationPortable InstrumentsPART TEMP. RANGE PIN-PACKAGECell ..
MAX8880ETT ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKELECTRICAL CHARACTERISTICS(V = V + 1V, SHDN = IN, C = 4.7µF, T = -40°C to +85°C, unless otherwise n ..
MAX8880ETT+ ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKapplications with long standby periods. Unlike ♦ 200mA max Output CurrentPNP-based designs, a 2Ω PM ..
MAX8880ETT+T ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKMAX8880/MAX888119-1679; Rev 2; 12/0712V, Ultra-Low-I , Low-DropoutQLinear Regulators with POK
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUapplications. MPEG decoding and transport demultiplexing are imple-mented in hardware. The on-chip ..
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUProduct ProfileOctober 1998Edition 1.1MB87L2250 - MPEG2 Transport, Video andAudio Decoder with inte ..
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUFEATURES• RISC CPU integrated (32-bit)Pin Assignment • 1 KByte I-Cache• 2.5 Frame Architecture• Onl ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FUJITSU SEMICONDUCTORDS04-13105-2EDATA SHEETLinear IC ConverterCMOSA/D Converter(With 4-channel I ..
MB88101APF ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..

MAX887HESA+-MAX887HESA+T
100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
_______________General Description
The MAX887 high-efficiency, step-down DC-DC con-
verter provides an adjustable output from 1.25V to
10.5V. It accepts inputs from 3.5V to 11V and delivers
600mA. Operation to 100% duty cycle minimizes
dropout voltage (300mV typ at 500mA). Synchronous
rectification reduces output rectifier losses, resulting in
efficiency as high as 95%.
Fixed-frequency pulse-width modulation (PWM)
reduces noise in sensitive communications applica-
tions. Using a high-frequency internal oscillator allows
tiny surface-mount components to reduce PC board
area, and eliminates audio-frequency interference. A
SYNC input allows synchronization to an external clock
to avoid interference with sensitive RF and data-
acquisition circuits.
The MAX887 features current-mode operation for supe-
rior load/line-transient response. Cycle-by-cycle current
limiting protects the internal MOSFET and rectifier. A
low-current (2.5μA typ) shutdown mode conserves bat-
tery life.
________________________Applications
Portable Instruments
Cellular Phones and Radios
Personal Communicators
Distributed Power Systems
Computer Peripherals
____________________________Features95% Efficiency 600mA Output CurrentCycle-by-Cycle Current LimitingLow-Dropout, 100% Duty-Cycle Operation,
300mV at 500mAInternal 0.6Ω(typ) MOSFETInternal Synchronous RectifierHigh-Frequency Current-Mode PWMExternal SYNC or Internal 300kHz OscillatorGuaranteed 260kHz to 340kHz Internal Oscillator
Frequency Limits2.5μA Shutdown Mode00% Duty Cycle, Low-Noise, ep-Down, PWM DC-DC Converter
SYNC
GND
SHDN
REF
MAX887
TOP VIEW
__________________Pin Configuration
MAX887
REF
165kW
100kW
0.047mF2.2mF
47mF47mFC1
100pF
0.33mF
33mHLX
GND
SYNC
SHDN
VOUT = 3.3V
VOUT = 1.25V (R1/R2 + 1)
VIN = 3.5V to 11VOFF
__________Typical Operating Circuit
19-1142 Rev 0; 9/96
PART
MAX887HC/D
MAX887HESA-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
Dice*
8 SO
EVALUATION KIT MANUALAVAILABLE
______________Ordering Information
*Contact factory for availability. Dice are tested at TA= +25°C.
00% Duty Cycle, Low-Noise, ep-Down, PWM DC-DC ConverterABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V, SHDN= V+, (TA= 0°C to TMAX), unless otherwise noted.)
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.
REF, FB, SYNC, VL to GND.....................................-0.3V to +6V
V+ to GND.............................................................-0.3V to +12V
SHDN, LX to GND.......................................-0.3V to (V+ + 0.3V)
PGND to GND......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +70°C)
SO (derate 9.09mW/°C above +70°C) .........................471mW
Operating Temperature Ranges
MAX887HC/D.......................................................0°C to +70°C
MAX887HESA...................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +165°C
Lead Temperature (soldering, 10sec)............................+300°C
SYNC = GND or 3V
IOUT= 0mA, SYNC = GND
V+ rising
IOUT= 0mA, SYNC = 3.0V
V+ falling
V+ = floating, LX = 5V, SHDN= GND
V+ = 12V, LX = GND to 12V
ILX= ±100mA
SYNC = 3.0V
FB = 1.30V
SYNC = 3.0V, PWM duty cycle = 50%
SHDN= GND
Circuit of Figure 2
IOUT= 0mA to 500mA
VIN= 4V to 11V, PWM mode
SYNC = 3.0V, FB = 1.18V
CONDITIONS2.4VIH, SHDNSHDNInput High Voltage±1IIN, SYNCSYNC Input Current0.5VIL, SYNCSYNC Input Low Voltage2.5VIH, SYNCSYNC Input High Voltage3.13.5V+, STARTStartup Voltage3.03.3V+, UVLOUndervoltage Lockout1.020ILXLKGRLX Reverse Leakage Current,
Regulator Off-101.010ILXLKGLX Leakage Current0.6RON, LXLX On-Resistance0.751.01.40ILIM+High-Side Current Limit
kHz260300340fOSCPWM Switching Frequency
SHDNInput Low VoltageVIL, SHDN100PWM, DUTYPWM Maximum Duty Cycle0.20.5IV+, PFMQuiescent Supply Current
(PFM Mode)2.74.0IV+, PWM3.511.0V+Supply Range
Quiescent Supply Current
(PWM Mode)500SYNC, PWSYNC Pulse Width High or Low
kHz25440fSYNCSYNC Frequency±0.10IFBFB Input Current1.2251.2501.275VFBPWM FB Feedback Threshold2.55IV+, SHDNShutdown Supply Current1.2510.50VOUT, RANGEOutput Voltage Range
%/mA0.005Load Regulation
%/V0.2Line Regulation
UNITSMINTYPMAXSYMBOLPARAMETER
0.8V
SHDNInput Current, SinkingIIN-, SHDNSHDN= GND or V+±1μA
SHDNInput CapacitanceCIN, SHDN(Note 1)10pF
VL Output VoltageVLIVL= 0mA to 1mA3.3V
REF Output VoltageVREF0μA to 30μA1.25V
Note 1:Guaranteed by design and not production tested.
00% Duty Cycle, Low-Noiseep-Down, PWM DC-DC ConverteNote 2:Specifications from 0°C to -40°C are guaranteed by design and not production tested.
IOUT= 0mA, SYNC = GND
V+ rising
IOUT= 0mA, SYNC = 3.0V
V+ falling
SYNC = 3.0V
FB = 1.30V
SYNC = 3.0V, PWM duty cycle = 50%
SHDN= GND
Circuit of Figure 2
CONDITIONS3.13.5V+, STARTStartup Voltage3.03.3V+, UVLOUndervoltage Lockout0.751.001.50ILIM+High-Side Current Limit
kHz250300350fOSCPWM Switching Frequency0.20.6IV+, PFMQuiescent Supply Current
(PFM Mode)2.74.0IV+, PWM3.511.0V+Supply Range
Quiescent Supply Current
(PWM Mode)±0.10IFBFB Input Current1.2221.2501.278VFBPWM FB Feedback Threshold2.55IV+, SHDNShutdown Supply Current1.2510.50VOUT, RANGEOutput Voltage Range
UNITSMINTYPMAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V, SHDN= V+, (TA= -40°C to +85°C), unless otherwise noted.) (Note 2)
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
LOAD CURRENT (mA)
DROPOUT VOLTAGE
vs. LOAD CURRENT
AX887-01
(V 3.3V SETTING
VOUT = 3.135V
5V SETTING
VOUT = 4.75V
FIC
(%
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
AX887-02PWM MODE
(SYNC = VL)
VOUT = 3.3V
VIN = 4V
VIN = 5V
VIN = 7V
VIN = 11V
VIN = 9V
(%
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
MAX887-03PWM MODE
(SYNC = VL)
VOUT = 5V
VIN = 9V
VIN = 5.5VVIN = 11V
VIN = 7V
00% Duty Cycle, Low-Noise, ep-Down, PWM DC-DC Converter____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
0.0001 0.0010.010.10.6
(%
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
AX887-04
IDLE MODE
(SYNC = GND)
VOUT = 3.3V
VIN = 5V
VIN = 7V
VIN = 9V
VIN = 11V
VIN = 4V
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
AX887-05
IDLE MODE
(SYNC = GND)
VOUT = 5V
VIN = 5.5V
VIN = 9V
VIN = 7V
VIN = 11V
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
AX887-06
GUARANTEED OUTPUT CURRENT
OF FIGURE 2 IS 600mA
3.3V SETTING, VOUT = 3.135V
5V SETTING, VOUT = 4.75V
(m
SYNC FREQUENCY (kHz)
MAXIMUM OUTPUT CURRENT
vs. SYNC FREQUENCY
AX887-07
C2, C3 = 47µF
L1 = 33µH
VIN = 5V
VOUT = 3.3V
VOUT = -5% at IOUT(MAX)
(k
SUPPLY VOLTAGE (V)
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
AX887-10VOUT = 3.3V
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
AX887-08A
A: VOUT = 3.3V, PWM MODE
B: VOUT = 3.3V, PFM MODE24681012141618
TEMPERATURE (°C)
QUIESCENT CURRENT
vs.TEMPERATURE
AX887-09
PWM MODE
VIN = 5.3V
VOUT = 3.3V
PFM MODE
(k
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX887-11
VOUT = 3.3V
10k10M
OUTPUT RIPPLE AND HARMONICS
MAX887 TOC-20
FREQUENCY (Hz)
100k1M
VIN = 5V
VOUT = 3.3V
IOUT = 500mA
PWM MODE
00% Duty Cycle, Low-Noiseep-Down, PWM DC-DC Converte____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
VIN = 5V, VOUT = 3.3V, LOAD = 500mA
A: LX, 5V/div
B: VOUT, 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 500mA/divs/div
HEAVY-LOAD, PWM-MODE
SWITCHING WAVEFORMS
0mA
MAX887-12
VIN = 5V, VOUT = 3.3V, LOAD = 0mA
A: LX, 5V/div
B: VOUT, 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 500mA/divs/div
LIGHT-LOAD, PWM-MODE
SWITCHING WAVEFORMS
AX887-13
VIN = 5V, VOUT = 3.3V, LOAD = 0mA
A: LX, 5V/div
B: VOUT, 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 200mA/divs/div
LIGHT-LOAD, PFM-MODE
SWITCHING WAVEFORMS
AX887-14
VIN = 5V, VOUT = 3.3V, LOAD = 70mA
A: LX, 5V/div
B: VOUT, 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 200mA/div
10ms/div
MEDIUM-LOAD, PFM-MODE
SWITCHING WAVEFORMS
MAX887-15
00% Duty Cycle, Low-Noise, ep-Down, PWM DC-DC Converter_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
40ms/div
LOAD-TRANSIENT RESPONSE
VIN = 5V, VOUT = 3.3V,
LOAD = 0mA TO 500mA, PWM MODE
A: LX, 5V/div
B: VOUT, 50mV/div, AC COUPLED
C: LOAD CURRENT, 500mA/div
AX887-16
200ms/div
LINE-TRANSIENT RESPONSE
VIN = 5V TO 11V, VOUT = 3.3V,
LOAD = 500mA, PWM MODE
A: VIN, 5V/div
B: VOUT, 20mV/div, AC COUPLED
AX887-17
200ms/div
RECOVERY FROM 100% DUTY CYCLE
(DROP OUT)
VIN = 3.3V TO 11V, VOUT = 3.3V,
LOAD = 500mA, PWM MODE
A: VIN, 5V/div
B: VOUT, 50mV/div, AC COUPLED
C: LX, 10V/div
AX887-18
500ms/div
SHUTDOWN AND STARTUP RESPONSE
VIN = 5V, VOUT = 3.3V,
LOAD = 100mA, PWM MODE
A: SHDN, 5V/div
B: VOUT, 2V/div, AC COUPLED
C: LX, 5V/div
D: INDUCTOR CURRENT, 500mA/div
MAX887-19

Partno	Mfg	Dc	Qty	Available	Descript
MAX887HESA+	MAIXM	N/a	4000	avai	100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
MAX887HESA+ \|MAX887HESA	MAXIM	N/a	1450	avai	100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
MAX887HESA+T	MAXIM	N/a	1500	avai	100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter