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MAX8645X, MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
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Status
Active: In Production.
Description
The MAX8645X/MAX8645Y charge pumps drive up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1–M6) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1 and F2) is independently controlled and can be driven up to 200mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs' output voltages are pin programmable to meet different camera-module requirements. The MAX8645X and MAX8645Y differ only in LDO output voltages. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8645X/MAX8645Y achieve high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure
low EMI and low input ripple.
The MAX8645X/MAX8645Y are available in a 28-pin TQFN, 4mm x 4mm (0.8mm max height) lead-free package.
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Data Sheet
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An evaluation kit is available: MAX8645YEVKIT
Key Features
- Power Up to Eight LEDs
- Up to 30mA/LED Drive for Backlight
- Up to 400mA Total Drive for Flash
- Two Internal Low-Noise 200mA LDOs
- 94% Max/85% Avg Efficiency (PLED/PBATT) over Li+ Battery Discharge
- 0.2% Typical LED Current Matching
- Adaptive 1x/1.5x/2x Mode Switchover
- Single-Wire, Serial-Pulse Interface for Brightness Control (32 Steps)
- 2-Bit Logic (Three Levels)
- Thermal TA Derating Function
- Low Input Ripple and EMI
- 2.7V to 5.5V Supply Voltage Range
- Soft-Start, Overvoltage, and Thermal-Shutdown Protection
- 28-Pin TQFN, 4mm x 4mm Package
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Key Specifications:
| White LED Drivers |
| Part Number |
Topology |
LEDs |
Config. |
Dimming Control |
VDROPOUT
(mV) |
POUT
(W) |
ILED
(mA) |
VIN
(V) |
VIN
(V) |
ICC
(mA) |
VOUT
(V) |
Oper. Freq.
(kHz) |
Package/Pins |
Budgetary Price |
| max num. of |
typ |
max |
min |
max |
max |
max |
See Notes |
| MAX8645 |
Charge Pump |
8 |
Parallel |
| Analog | | Digital | | PWM | | Serial Pulse |
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40 |
2.8 |
200 |
2.7 |
5.5 |
5.5 |
5.5 |
1000 |
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$2.95 @1k |
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See All White LED Drivers (47)
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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
Product Guides
Reliability Reports
| Reliability Report: |
MAX8645Y.pdf |
| 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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| MAX8645XETI+
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Active |
TQFN;28 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8645XETI+T
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Active |
TQFN;28 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8645YETI+
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Active |
TQFN;28 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8645YETI+T
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Active |
TQFN;28 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*
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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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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-3978
Rev 4;
2008-07-01
This page last modified: 2009-09-04
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