MAX1553, MAX1554 High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

Description

The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 40V, low R_DSON, N-channel MOSFET switch for high efficiency and maximum battery life. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs.

A single analog/PWM Dual Mode™ input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup.

The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.

Key Features

Applications/Uses

Constant-Current Regulation for Even LED Illumination
Internal 40V MOSFET Switch Capable of Driving 10 LEDs
Small, Low-Profile External Components
2.7V to 5.5V Input Range
Up to 88% Efficiency Driving 6 LEDs
Up to 82% Efficiency Driving 9 LEDs (20mA, V_CC = 3.6V)
Analog or PWM Control of LED Intensity
Optimized for Low Input Ripple
Soft-Start to Minimize Inrush Current
3mm x 3mm 8-Pin TDFN Package

	Cell Phones
	Color Display Backlight
	PDA, Palmtop, and Wireless Handhelds

Key Specifications: White LED Drivers

Part Number

Topology

Max. No. of LEDs

Configuration

Dimming Control

V_{CURR_SENSE} (mV)

P_OUT (W)

I_MAX per LED (mA)

Min. V_IN (V)

Max. V_IN (V)

I_CC (max) (mA)

Max. V_OUT (V)

Fixed Freq.

Soft Start

Internal Power Switch(es)

Shutdown

Open LED Protection

Camera Flash

LED Temp. Derating

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX1553

Inductor Based

Series

Analog
PWM

200

0.5

2.7

5.5

0.35

Yes

THIN QFN (Dual)/8

-40 to +85

$1.25 @ 1k

MAX1554

0.8

0.65

$1.35 @ 1k

See All White LED Drivers (41)

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.

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-8 of 8

MAX1553

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1553ETA+

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1553ETA

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1553ETA-T

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1553ETA+T

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1554

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1554ETA+

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1554ETA

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1554ETA-T

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1554ETA+T

THIN QFN (Dual);8 pin;10 mm²
Dwg: 21-0137I (PDF)
Use pkgcode/variation: T833+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

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