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MAX1777, MAX1977, MAX1999
High-Efficiency, Quad Output, Main Power-Supply Controllers for Notebook Computers
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Status
Active: In Production.
Description
The MAX1777/MAX1977/MAX1999 dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX1777/MAX1977/MAX1999 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the main SMPS outputs. The MAX1777/MAX1977/MAX1999 include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown.
Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications.
The MAX1777 features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX1977 features a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light” applications. The MAX1999 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The MAX1777/MAX1977/MAX1999 are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C). The MAX1777/
MAX1977/MAX1999 are available in lead-free packages.
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Data Sheet
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An evaluation kit is available: MAX1999EVKIT
Key Features
- No Current-Sense Resistor Needed (MAX1999)
- Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977)
- 1.5% Output Voltage Accuracy
- 3.3V and 5V 100mA Bootstrapped Linear Regulators
- Internal Soft-Start and Soft-Stop Output Discharge
- Quick-PWM with 100ns Load Step Response
- 3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)
- 4.5V to 24V Input Voltage Range
- Ultrasonic Pulse-Skipping Mode (25kHz min)
- Power-Good (PGOOD) Signal
- Overvoltage Protection Enable/Disable
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Applications/Uses
- 3- and 4-Cell Li+ Battery-Powered Devices
- Notebook and Subnotebook Computers
- PDAs and Mobile Communication Devices
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset 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 |
| MAX1777 |
6 |
24 |
2 |
5.5 |
|
10 |
10 |
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2 |
300 |
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61.9 |
$5.51 @1k |
| MAX1977 |
500 |
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$5.51 @1k |
| MAX1999 |
500 |
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$5.51 @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
Functional Diagram
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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| MAX1777EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1777EEI+
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1777EEI+T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1777EEI-T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1977EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1977EEI+
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1977EEI+T
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1977EEI-T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1999EEI
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1999EEI+
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
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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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| MAX1999EEI+T
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Active |
QSOP;28 pin;61.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0173 (PDF)
Use pkgcode/variation: E28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1999EEI-T
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Active |
QSOP;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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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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Similar Products by Function
Evaluation Kits
| MAX1999EVKIT |
Evaluation Kit for the MAX1777, MAX1977, MAX1999 |
Products with Similar Part Numbers
| MAX1999EVKIT |
Evaluation Kit for the MAX1777, MAX1977, MAX1999 |
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2187
Rev 1;
2004-10-07
This page last modified: 2009-10-14
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