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Part: MAX1801
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Digital-camera Step-up Slave DC-DC Controller
Company: Maxim Integrated Products
Datasheet: Download MAX1801 datasheet File size : 750 kB
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Datasheet text preview:
19-1741 Rev 0; 10/00
Digital Camera Step-Up Slave DC-DC Controller
General Description
The MAX1801 step-up slave DC-DC controller is used with either the MAX1800 (step-up) or the MAX1802 (stepdown) master DC-DC converter to provide a complete power-supply solution for digital still and digital video cameras. By using the master converter's reference voltage and oscillator, the size and the cost of the slave controller are reduced and all converters are guaranteed to switch at the same frequency. The MAX1801 drives an external N-channel MOSFET a n d can be used in step-up, single-ended primary inductance converter (SEPIC), and flyback topologies. If extra supplies are required for a new design, slave controllers can be added to an existing master circuit with m i n i m a l redesign, saving both cost and time. The MAX1801 features a built-in soft-start, short-circuit protection, and an adjustable duty-cycle limit. T h e MAX1801 is available in a space-saving 8-pin SOT23 package. Separate evaluation kits combining the MAX1800/MAX1801 (MAX1800EVKIT) and MAX1802/ MAX1801 (MAX1802EVKIT) are available to expedite designs.
Features
o Provides Simple Expandability for the MAX1800 and MAX1802 Master Converters o Operates in Step-Up, SEPIC, and Flyback Topologies o 100kHz to 1MHz Adjustable Operating Frequency o Duty-Cycle Limit Adjustable from 40% to 90% o Soft-Start o Short-Circuit Protection o 0.01µA Supply Current in Shutdown Mode o Tiny 8-Pin SOT23 Package
MAX1801
Ordering Information
PART MAX1801EKA-T TEMP. RANGE -40°C to +85°C PIN-PACKAGE 8 SOT23-8
________________________Applications
Digital Still Cameras Digital Video Cameras Portable DVD Players Internet Access Tablets PDAs Hand-Held Devices
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
BATTERY 0.7V TO VOUT
VOUT
MAX1800
1.25V REF OSC
MAX1801
DL FB COMP
OR
MAX1802
2.2V TO 5.5V IN
DCON GND
________________________________________________________________ Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Digital Camera Step-Up Slave DC-DC Controller MAX1801
ABSOLUTE MAXIMUM RATINGS
IN, DCON, REF, OSC, FB to GND.......-0.3V to +6.0V DL, COMP to GND......-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 6mW/°C above+70°C).......480mW 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
(Circuit of Figure 1, VIN = +3.3V, VDCON = +1.25V, VREF = +1.25V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER GENERAL VIN Supply Voltage Operating Range VIN Undervoltage Lockout Threshold REF Input Range REF Undervoltage Lockout Threshold Shutdown Supply Current Sleep-Mode Supply Current Quiescent Supply Current OSCILLATOR INPUT OSC Input Leakage Current Oscillator Frequency Range OSC Clock Low Trip Level OSC Clock High Trip Level Maximum Duty Cycle Adjustment Range (Note 2) Maximum Duty Cycle (Note 2) Default Maximum Duty Cycle (Note 2) INPUTS/OUTPUTS DCON Input Leakage Current DCON Input Sleep-Mode Threshold REF Input Current ERROR AMPLIFIER FB Regulation Voltage FB to COMP Transconductance FB to COMP Maximum Voltage Gain FB Input Leakage Current VFB = 1.35V -5µA < ICOMP < 5µA 1.238 70 1.250 100 2000 30 100 1.263 160 V µS V/V nA VDCON = 5.5V IIN 10µA V DCON = 0 V DCON = V REF VDCON = VREF , during soft-start 0.35 9 0.4 0.5 3.3 13 100 0.45 1.1 10 30 µA nA V VDCON = 0.625V fOSC = 100kHz VDCON = 0.625V, fOSC = 100kHz VDCON = 1.25V, fOSC = 100kHz VOSC = 1.5V 100 0.20 1.00 0.575 40 50 84 0.25 1.05 0.625 0.04 1 1000 0.30 1.10 0.675 90 µA kHz V V % % % VREF rising VIN = 5.5V, VDCON = 0, VREF = 0 VIN = 3.3V, VDCON = 0, VREF = 1.25V VOSC = 0, VFB = 0 VIN rising 2.7 2.2 1.19 0.9 2.35 1.25 1.0 0.01 5 124 5.5 2.5 1.31 1.1 1 10 300 V V V V µA µA µA CONDITIONS MIN TYP MAX UNITS
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Digital Camera Step-Up Slave DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = +3.3V, VDCON = +1.25V, VREF = +1.25V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER DRIVER DL Driver Resistance DL Drive Current SOFT-START Soft-Start Interval SHORT-CIRCUIT PROTECTION Fault Interval 1024 OSC cycles 1024 OSC cycles 2.5 0.5 5 A CONDITIONS MIN TYP MAX UNITS
MAX1801
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN = +3.3V, VDCON = +1.25V, VREF = +1.25V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER GENERAL VIN Supply Voltage Operating Range VIN Undervoltage Lockout Threshold REF Input Range REF Undervoltage Lockout Threshold Shutdown Supply Current Sleep-Mode Supply Current Quiescent Supply Current OSCILLATOR INPUT OSC Input Leakage Current Oscillator Frequency Range OSC Clock Low Trip Level OSC Clock High Trip Level Maximum Duty Cycle Adjustment Range (Note 2) INPUTS/OUTPUTS DCON Input Leakage Current DCON Input Sleep-Mode Threshold REF Input Current VDCON = 5.5V IIN 10µA V DCON = 0 V DCON = V REF VDCON = VREF , during soft-start 0.35 100 0.45 1.1 10 30 µA nA V VDCON = 0.625V fOSC = 100kHz VOSC = 1.5V 100 0.20 1.00 0.575 40 1 1000 0.30 1.10 0.675 90 µA kHz V V % VREF rising VIN = 5.5V, VDCON = 0, VREF = 0 VIN = 3.3V, VDCON = 0, VREF = 1.25V VOSC = 0, VFB = 0 VIN rising 2.7 2.15 1.19 0.85 5.5 2.55 1.31 1.15 1 10 300 V V V V µA µA µA CONDITIONS MIN TYP MAX UNITS
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