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MAX1878
Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs
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Status
Description
The MAX1878 dual power supply contains a step-down and step-up DC-DC converter in a small 12-pin TQFN package for use in PDAs. The step-down DC-DC converter delivers over 500mA to an output as low as 1.25V for logic power. The step-up DC-DC converter delivers over 15mA and an output as high as 28V for a liquid crystal display (LCD). With an input voltage from 2.0V to 5.5V the MAX1878 is intended for use in systems powered by a 2-cell alkaline or 1-cell lithium-ion (Li+) battery.
Fast switching frequency allows the use of small inductors and capacitors, and the low 19µA typical quiescent current allows high efficiency when the system is in standby mode. Each output can be independently enabled.
The MAX1878 is available in a small 0.75mm high 4mm x 4mm 12-pin TQFN package and requires no external FETs. The MAX1878 evaluation kit is available to speed designs.
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Data Sheet
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An evaluation kit is available: MAX1878EVKIT
Key Features
- Evaluation Kit Available to Speed Designs
- Two Output Voltages
- Main Output: 1.25V to VIN
- LCD Output: Up to 28V
- 2.0V to 5.5V Input Range
- Low 19µA Quiescent Supply Current
- 1µA Shutdown Supply Current
- High Switching Frequency for Small External Components
- Small 0.75mm High 4mm x 4mm 12-Pin TQFN Package
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Applications/Uses
- GPS Receivers
- MP3 Players
- Organizers/Translators
- Personal Digital Assistants (PDAs)
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Key Specifications:
| Multifunction PMICs |
| Part Number |
Primary Topology |
Monitor/Control Features |
DC-DC/Power Features |
LCD/LED/Flash/CCD Features |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1878 |
Step-Down |
Shutdown |
| Current Limit | | Internal Pwr. FETs | | Soft Start | | Sync. Rectifier |
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TFT Bias |
2 |
5.5 |
1.25 |
28 |
0.5 |
0.5 |
1000 |
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16 |
$1.68 @1k |
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See All Multifunction PMICs (96)
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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
| 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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| MAX1878EGC
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N/A |
No Longer Available |
QFN;12 pin;16 mm²
Land Pattern: Not Available
Use pkgcode/variation: G1244-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1878EGC-T
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N/A |
No Longer Available |
QFN;12 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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| MAX1878ETC+
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1878ETC+T
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
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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| MAX1606 |
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Information Index
Document Ref.: 19-2248
Rev 2;
2011-06-29
This page last modified: 2011-06-29
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