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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1846 Datasheet

High-Efficiency / Current-Mode / Inverting PWM Controller

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MAX1846 pdf
19-2091; Rev 0; 8/01
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
Features
o 90% Efficiency
o +3.0V to +16.5V Input Range
o -2V to -200V Output
o Drives High-Side P-Channel MOSFET
o 100kHz to 500kHz Switching Frequency
o Current-Mode, PWM Control
o Internal Soft-Start
o Electrolytic or Ceramic Output Capacitor
o The MAX1847 also offers:
Synchronization to External Clock
Shutdown
N-Channel Inverting Flyback Option
PART
MAX1846EUB
MAX1847EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
16 QSOP
Typical Operating Circuit
POSITIVE
VIN
VL IN
EXT
MAX1846
MAX1847
COMP
CS
FREQ
PGND
P NEGATIVE
VOUT
REF
GND
FB
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1846 Datasheet

High-Efficiency / Current-Mode / Inverting PWM Controller

No Preview Available !

MAX1846 pdf
High-Efficiency, Current-Mode,
Inverting PWM Controller
ABSOLUTE MAXIMUM RATINGS
IN, SHDN to 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
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.
ELECTRICAL CHARACTERISTICS
(V SHDN = VIN = +12V, SYNC = GND, PGND = GND, RFREQ = 147k±1%, CVL = 0.47µF, CREF = 0.1µF, TA = 0°C to +85°C, unless
otherwise noted.)
PARAMETER
CONDITIONS
PWM CONTROLLER
Operating Input Voltage Range
UVLO Threshold
UVLO Hysteresis
VIN rising
VIN falling
FB Threshold
No load
FB Input Current
VFB = -0.1V
Load Regulation
CCOMP = 0.068µF, VOUT = -48V,
IOUT = 20mA to 200mA (Note 1)
Line Regulation
Current-Limit Threshold
CCOMP = 0.068µF, VOUT = -48V,
VIN = +8V to +16.5V, IOUT = 100mA
CS Input Current
CS = GND
Supply Current
Shutdown Supply Current
VFB = -0.1V, VIN = +3.0V to +16.5V
SHDN = GND, VIN = +3.0V to +16.5V
REFERENCE AND VL REGULATOR
REF Output Voltage
REF Load Regulation
VL Output Voltage
VL Load Regulation
IREF = 50µA
IREF = 0 to 500µA
IVL = 100µA
IVL = 0.1mA to 2.0mA
MIN TYP MAX UNITS
3.0 16.5 V
2.8 2.95
2.6 2.74
V
60 mV
-12 0 12 mV
-50 -6 50 nA
-1 0 %
0.04 %
85 100 115 mV
10 20 µA
0.75 1.2
mA
10 25 µA
1.236
3.85
1.25
-2
4.25
-20
1.264
-15
4.65
-60
V
mV
V
mV
2 _______________________________________________________________________________________


Part Number MAX1846
Description High-Efficiency / Current-Mode / Inverting PWM Controller
Maker Maxim
Total Page 20 Pages
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