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MAX1536
3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control
3.6A, 1.4MHz, Low-Voltage, Internal Switch Step-Down Regulator with Dynamic Output-Voltage Control
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Status
Active: In Production.
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 54mΩ PMOS power switch and 47mΩ 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-off-time, PWM control scheme. It has selectable Idle Mode™ 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 low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1536 is available in a 28-pin thin QFN package with an exposed backside pad.
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Data Sheet
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An evaluation kit is available: MAX1536EVKIT
Key Features
- Dynamically Selectable Output Voltage from +0.7V to VIN
- Internal PMOS/NMOS Switches
- 54mΩ/47mΩ On-Resistance at VIN = +4.5V
- 63mΩ/53mΩ 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
- <1µA Typical Shutdown Supply Current
- <750µA 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
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Applications/Uses
- Active Termination Buses
- Chipset/Graphics Cores with Dual-Supply Voltages
- DDR Memory Termination
- Notebook Computers
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1536 |
3 |
5.5 |
0.7 |
5.5 |
3.6 |
3.6 |
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1 |
1400 |
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26 |
$5.29 @1k |
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See All Step-Down Switching Regulators (284)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1536ETI
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855-6*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1536ETI+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1536ETI+T
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1536ETI-T
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855-6*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
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Information Index
Document Ref.: 19-2729
Rev 1;
2005-09-26
This page last modified: 2009-06-01
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