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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.

More Information

Topmark Coding	MAX8989
New Product Press Release	[ 2011-02-17 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5489 Rev 1; 2011-06-02
This page last modified: 2012-02-10