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MAX8989

Multimode PA Step-Down Converter with Linear Bypass Mode

Compact Package (1.6mm x 1.6mm) Powers Multimode PAs Efficiently to Extend Talk Time Up to 25% in Mobile Phones

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX8989 step-down converter is optimized for powering the power amplifier (PA) in multistandard handsets such as LTE, WCDMA, GSM, and EDGE. The device integrates a high-efficiency PWM step-down converter for medium- and low-power transmission with an 85mΩ (typ) low dropout (LDO) bypass regulator, in parallel with the step-down converter, enabling high-power transmission.

The IC uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The bypass LDO powers the PA directly from the battery during high-power transmission or in case of insufficient headroom between the input and programmed output. The bypass LDO is enabled when the output voltage is greater than 1.0V. In the case where the output current exceeds the step-down converter current limit, the bypass LDO provides supplementary current to the output, ensuring a stable output voltage. The bypass LDO also provides a smooth transition between step-down regulation and operation in dropout.

The IC is available in a 9-bump, 1.6mm x 1.6mm WLP package (0.69mm max height).

Data Sheet

Download	Rev 1	(PDF, 2.7MB)
E-Mail

An evaluation kit is available: MAX8989EVKIT

Key Features

PA Step-Down Converter
- 25µs (typ) Settling Time for 0.4V to 3.2V Output Voltage Change
- Dynamic Output Voltage Setting from 0.4V to V_IN
- 85mΩ pFET and 100% Duty Cycle for Low Dropout
- 2MHz Switching Frequency
- Low Output Voltage Ripple
- 2% Output Voltage Accuracy Over Load, Line, and Temperature
- Tiny External Components
2.5A Output Current Capability
Simple Logic On/Off Control
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Thermal Overload Protection
1.6mm x 1.6mm WLP Package (0.69mm max Height)

Applications/Uses

LTE, WCDMA, GSM, and EDGE Cell Phones/Smartphones

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

min

max

min

max

≤

max w/pins

MAX8989

2.7

5.5

0.4

5.5

2.5

Dyn. REF In

2000

WLP/9

2.7

See All Step-Down Switching Regulators (288)

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.

Reliability Reports

Reliability Report:	MAX8989.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8989AEWL+T			Active	WLP;9 pin;2.7 mm² Outline Drawing:21-0067 (PDF) Land Pattern: Not Available Use pkgcode/variation: W91B1+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8989EWL+T			Active	WLP;9 pin;2.7 mm² Outline Drawing:21-0067 (PDF) Land Pattern: Not Available Use pkgcode/variation: W91B1+1*	-40°C to +85°C	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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Evaluation Kits

MAX8989EVKIT

Evaluation Kit for the MAX8989

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