MAX1846EUB-MAX1847EEE Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1846EUB ,High-Efficiency / Current-Mode / Inverting PWM ControllerFeaturesMAX1846/MAX1847 high-efficiency PWM inverting con- 90% Efficiencytrollers allow designers ..
MAX1846EUB+ ,High-Efficiency, Current-Mode, Inverting PWM ControllerFeatures● 90% EfficiencyMAX1846/MAX1847 high-efficiency PWM inverting con-trollers allow designers ..
MAX1846EUB+T ,High-Efficiency, Current-Mode, Inverting PWM ControllerEVALUATION KIT AVAILABLEMAX1846–MAX1847 High-Efficiency, Current-Mode, Inverting PWM Controller
MAX1846EUB+T ,High-Efficiency, Current-Mode, Inverting PWM ControllerElectrical Characteristics(V = V = +12V, SYNC = GND, PGND = GND, R = 147kΩ ±1%, C = 0.47µF, C = 0.1 ..
MAX1847EEE ,High-Efficiency / Current-Mode / Inverting PWM Controllerfeatures clock synchronization and shut-down functions. The MAX1847 can also be configuredPART TEMP ..
MAX1847EEE ,High-Efficiency / Current-Mode / Inverting PWM Controllerapplications. Both devices operate -2V to -200V Output from +3V to +16.5V input and generate -2V t ..
MAX474CUA ,Single/Dual/Quad, 10MHz Single-Supply Op Ampsapplications. Withtheir fast slew rate and settling time, they can replace ' Rail-to-Rail Output Sw ..
MAX474EPA ,Single/Dual/Quad, 10MHz Single-Supply Op AmpsApplicationsMAX473CSA 0°C to +70°C 8 SOPortable EquipmentMAX473CUA 0°C to +70°C 8 µMAXBattery-Power ..
MAX474EPA ,Single/Dual/Quad, 10MHz Single-Supply Op AmpsMAX473/MAX474/MAX47519-0260; Rev 1; 3/95Single/Dual/Quad, 10MHzSingle-Supply Op Amps_______________
MAX474ESA ,Single/Dual/Quad, 10MHz Single-Supply Op AmpsELECTRICAL CHARACTERISTICS(+3V ≤ VCC ≤ +5V, VEE = 0V, VCM = 0.5V, VOUT = 0.5V, TA = +25°C, unless o ..
MAX474ESA+ ,Single/Dual/Quad, 10MHz Single-Supply Op AmpsApplicationsMAX473CSA 0°C to +70°C 8 SOPortable EquipmentMAX473CUA 0°C to +70°C 8 μMAXBattery-Power ..
MAX4751EGE+ ,0.9Ω, Low-Voltage, Single-Supply Quad SPST Analog Switches

MAX1846EUB-MAX1847EEE
High-Efficiency / Current-Mode / Inverting PWM Controller
General Description
MAX1846/MAX1847 high-efficiency PWM inverting con-
trollers allow designers to implement compact, low-
noise, negative-output DC-DC converters for telecom
and networking applications. Both devices operate
from +3V to +16.5V input and generate -2V to -200V
output. To minimize switching noise, both devices fea-
ture a current-mode, constant-frequency PWM control
scheme. The operating frequency can be set from
100kHz to 500kHz through a resistor.
The MAX1846 is available in an ultra-compact 10-pin
µMAX package. Operation at high frequency, compati-
bility with ceramic capacitors, and inverting topology
without transformers allow for a compact design.
Compatibility with electrolytic capacitors and flexibility
to operate down to 100kHz allow users to minimize the
cost of external components. The high-current output
drivers are designed to drive a P-channel MOSFET and
allow the converter to deliver up to 30W.
The MAX1847 features clock synchronization and shut-
down functions. The MAX1847 can also be configured
to operate as an inverting flyback controller with an N-
channel MOSFET and a transformer to deliver up to
70W. The MAX1847 is available in a 16-pin QSOP
package.
Current-mode control simplifies compensation and pro-
vides good transient response. Accurate current-mode
control and over current protection are achieved
through low-side current sensing.
Applications
Cellular Base Stations
Networking Equipment
Optical Networking Equipment
SLIC Supplies
CO DSL Line Driver Supplies
Industrial Power Supplies
Automotive Electronic Power Supplies
Servers
Features90% Efficiency+3.0V to +16.5V Input Range -2V to -200V Output Drives High-Side P-Channel MOSFET100kHz to 500kHz Switching FrequencyCurrent-Mode, PWM ControlInternal Soft-StartElectrolytic or Ceramic Output CapacitorThe MAX1847 also offers:
Synchronization to External Clock
Shutdown
N-Channel Inverting Flyback Option
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Typical Operating Circuit
19-2091; Rev 0; 8/01
Ordering Information
Pin Configurations appear at end of data sheet.
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VSHDN= VIN= +12V, SYNC = GND, PGND = GND, RFREQ= 147kΩ±1%, CVL = 0.47µF, CREF= 0.1µF, TA= 0°C to +85°C, unless
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.
IN, SHDNto GND...................................................-0.3V to +20V
PGND to GND.......................................................-0.3V to +0.3V
VL to PGND for VIN≤5.7V...........................-0.3V to (VIN+ 0.3V)
VL to PGND for VIN> 5.7V.......................................-0.3V to +6V
EXT to PGND...............................................-0.3V to (VIN+ 0.3V)
REF, COMP to GND......................................-0.3V to (VL + 0.3V)
CS, FB, FREQ, POL, SYNC to GND.........................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........696mW
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
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
ELECTRICAL CHARACTERISTICS (continued)
(VSHDN= VIN= +12V, SYNC = GND, PGND = GND, RFREQ= 147kΩ±1%, CVL = 0.47µF, CREF= 0.1µF, TA= 0°C to +85°C, unless
otherwise noted.)
Note 1:Production test correlates to operating conditions.
Note 2:Guaranteed by design and characterization.
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
ELECTRICAL CHARACTERISTICS
(VSHDN= VIN= +12V, SYNC = GND, PGND = GND, RFREQ= 147kΩ±1%, CVL= 0.47µF, CREF= 0.1µF, TA= -40°C to +85°C,
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
10010100100010,000
EFFICIENCY vs. LOAD CURRENT
MAX1846/7 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)40
10010100100010,000
EFFICIENCY vs. LOAD CURRENT
MAX1846/7 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)40100010010
EFFICIENCY vs. LOAD CURRENT
MAX1846/7 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
OUTPUT VOLTAGE LOAD REGULATION
MAX1846/7 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1846/7 toc05
VIN (V)
IIN
(mA)1.238
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1846/7 toc06
TEMPERATURE (°C)
REF
(V)
Typical Operating Characteristics
(Circuit references are from Table 1 in the Main Application Circuitssection, CVL= 0.47µF, CREF= 0.1µF, TA = +25°C, unless otherwise
noted.)
ELECTRICAL CHARACTERISTICS (continued)
(VSHDN= VIN= +12V, SYNC = GND, PGND = GND, RFREQ= 147kΩ±1%, CVL= 0.47µF, CREF= 0.1µF, TA= -40°C to +85°C,
unless otherwise noted.) (Note 3)
Note 3:Parameters to -40°C are guaranteed by design and characterization.
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1846/7 toc10
SHUTDOWN SUPPLY CURRENT (
TEMPERATURE (°C)
OPERATING CURRENT
vs. TEMPERATURE
MAX1846/7 toc11
TEMPERATURE (°C)
OPERATING CURRENT (mA)
SWITCHING FREQUENCY
vs. RFREQ
MAX1846/7 toc12
RFREQ (kΩ)
fOSC
(kHz)
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1846/7 toc13
FREQUENCY (kHz)
TEMPERATURE (°C)
160200040006000800010,000
EXT RISE/FALL TIME
vs. CAPACITANCE
MAX1846/7 toc14
CAPACITANCE (pF)
TIME (ns)IL
5V/div
1A/div
5V/div
VOUT
EXITING SHUTDOWN
MAX1846/7 toc15
APPLICATION CIRCUIT B
1ms/div
SHDN
Typical Operating Characteristics (continued)
(Circuit references are from Table 1 in the Main Application Circuitssection, CVL= 0.47µF, CREF= 0.1µF, TA = +25°C, unless otherwise
noted.)
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
5V/div
1A/div
5V/div
VOUT
ENTERING SHUTDOWN
MAX1846/7 toc16
APPLICATION CIRCUIT B
1ms/div
SHDN
1A/div
10V/div
100mV/divVOUT
HEAVY-LOAD SWITCHING
WAVEFORM
MAX1846/7 toc17
APPLICATION CIRCUIT B
1µs/div
ILOAD = 600mA
1A/div
10V/div
100mV/divVOUT
LIGHT-LOAD SWITCHING
WAVEFORM
MAX1846/7 toc18
APPLICATION CIRCUIT B
1µs/div
ILOAD = 50mA1A/div
500mV/div
ILOAD
VOUT
LOAD-TRANSIENT RESPONSE
MAX1846/7 toc19
APPLICATION CIRCUIT B
2ms/div
ILOAD = 10mA to 400mA500mA/div
200mV/div
ILOAD
VOUT
LOAD-TRANSIENT RESPONSE
MAX1846/7 toc20
APPLICATION CIRCUIT C
400µs/div
ILOAD = 4mA to 100mA
Typical Operating Characteristics (continued)
(Circuit references are from Table 1 in the Main Application Circuitssection, CVL= 0.47µF, CREF= 0.1µF, TA = +25°C, unless otherwise
noted.)
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Pin Description
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controllerypical Application Circuit
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1847EEE	MAX	N/a	239	avai	High-Efficiency / Current-Mode / Inverting PWM Controller
MAX1847EEE	N/A	N/a	36	avai	High-Efficiency / Current-Mode / Inverting PWM Controller
MAX1846EUB	MAXIM	N/a	2157	avai	High-Efficiency / Current-Mode / Inverting PWM Controller
MAX1847EEE	MAXIM	N/a	100	avai	High-Efficiency / Current-Mode / Inverting PWM Controller