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MAX1637
Miniature, Low-Voltage, Precision Step-Down Controller
Low-Voltage, Precision Step-Down Controller for Portable CPU Power
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Status
Active: In Production.
Description
The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery
exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.
Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.
The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.
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Data Sheet
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An evaluation kit is available: MAX1637EVKIT
Key Features
- ±2% DC Accuracy
- 0.1% (typ) DC Load Regulation
- Adjustable Switching Frequency to 350kHz
- Idle Mode™ Pulse-Skipping Operation
- 1.10V to 5.5V Adjustable Output Voltage
- 3.15V Minimum IC Supply Voltage (at VCC pin)
- Internal Digital Soft-Start
- 1.1V ±2% Reference Output
- 1µA Total Shutdown Current
- Output Overvoltage Crowbar Protection
- Output Undervoltage Shutdown (foldback)
- Tiny 16-Pin QSOP Package
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Applications/Uses
- Handy-Terminals, PDAs
- Notebook Computers
- Subnotebook 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 |
| MAX1637 |
3.15 |
5.5 |
1.1 |
5.5 |
7 |
7 |
Resistor |
1 |
350 |
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30.9 |
$3.96 @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
Application Notes
Reliability Reports
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX1637EEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1637EEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1637EEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1637EEE-T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
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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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Notes and Comments
Synchronous rectifier, high efficiency over full IOUT range
Similar Products by Function
| MAX1636 |
Low-Voltage, Precision Step-Down Controller for Portable CPU Power |
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Information Index
Document Ref.: 19-1321
Rev 2;
2005-09-26
This page last modified: 2007-06-01
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