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Part Number: MAX1536ETI+
Description: The MAX1536 constant-off-time, pulse-width-modulated(PWM) step-down DC-to-DC converter is ideal for use in+5.0...
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MAX1536ETI+
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DataSheet
General Description
MAX1536ETI+ General Description
The MAX1536 constant-off-time, pulse-width-modulated (PWM) step-down DC-to-DC converter is ideal for use in+5.0V and +3.3V to low voltages for notebook and subnotebook computers. The MAX1536 features an internal PMOS power switch and internal synchronous rectification for high efficiency and reduced component count. No external Schottky diode is required across the internal synchronous rectifier switch. The internal 54m PMOS power switch and 47m NMOS synchronous-rectifier switch easily deliver continuous load currents up to 3.6A. The MAX1536 produces dynamically adjustable output voltages for chipsets and graphics processor cores using a logic-level control signal. The MAX1536 achieves efficiencies as high as 96%.
The MAX1536 uses a unique current-mode, constant-offtime, PWM control scheme. It has selectable Idle ModeTM to maintain high efficiency during light-load operation, or fixed-PWM mode for low output ripple. The programmable constant-off-time architecture allows a wide range of switching frequencies up to 1.4MHz, optimizing performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1536 features a digital soft-start to limit surge currents during startup, a 100% duty-cycle mode for lowdropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1A. The MAX1536 is available in a 28-pin thin QFN package with an exposed backside pad.
MAX1536ETI+ Maximum Ratings
VCC, IN, SHDN , SKIP to AGND .............................................................................................................-0.3V to +6V
OD, OD , GATE, PGOOD to AGND..............................................................................................................-0.3V to +6V
COMP, FB, REF to AGND...........................................................................................................................-0.3V to +6V
TOFF, REFIN, FBLANK to AGND ................................................................................................................-0.3V to +6V
IN to VCC .............................................................................................................................................-0.3V to +0.3V
PGND to AGND.................................................... ..................................................................................-0.3V to +0.3V
LX to PGND ................................................ ................................................................................-0.3V to (VIN + 0.3V)
LX Current (Note 1)............................................................................................................................................±5.7A
REF Short Circuit to AGND............................................................................................................................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin Thin QFN (derated 20.8mW/°C above +70°C;part mounted on 1in2 of 1oz copper) .........................1667mW
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
MAX1536ETI+ Features
Dynamically Selectable Output Voltage from+0.7V to VIN
Internal PMOS/NMOS Switches 54m/47m On-Resistance at VIN = +4.5V 63m/53m On-Resistance at VIN = +3.0V
+3.0V to +5.5V Input Voltage Range
1.4MHz Maximum Switching Frequency
2V ±0.75% Reference Output
Constant-Off-Time PWM Operation
Selectable Idle Mode/PWM Operation at Light Loads
100% Duty Factor in Dropout
Digital Soft-Start Inrush Current Limiting
<1A Typical Shutdown Supply Current
<750A Quiescent Supply Current
Thermal Shutdown
1% VOUT Accuracy Over Line and Load
External Reference Input
Power-Good Window Comparator
Selectable Power-Good Blanking Time During Output-Voltage Transition
Internal PMOS/NMOS Switches 54m/47m On-Resistance at VIN = +4.5V 63m/53m On-Resistance at VIN = +3.0V
+3.0V to +5.5V Input Voltage Range
1.4MHz Maximum Switching Frequency
2V ±0.75% Reference Output
Constant-Off-Time PWM Operation
Selectable Idle Mode/PWM Operation at Light Loads
100% Duty Factor in Dropout
Digital Soft-Start Inrush Current Limiting
<1A Typical Shutdown Supply Current
<750A Quiescent Supply Current
Thermal Shutdown
1% VOUT Accuracy Over Line and Load
External Reference Input
Power-Good Window Comparator
Selectable Power-Good Blanking Time During Output-Voltage Transition
MAX1536ETI+ Typical Application
Chipset/Graphics Cores
with Dual-Supply Voltages
Active Termination Buses
Notebook Computers
DDR Memory Termination
MAX1536ETI+ Connection Diagram
MAX1536ETI+
PDF/DataSheet Download
- Datasheet: MAX1536ETI+
- File Size: 378161 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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