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MAX8896

Dual PWM Step-Down Converter in a 2mm x 2mm Package for WCDMA PA and RF Power

Small (4mm)² Package Provides Power to WCDMA PA Modules and RF Transceiver

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX8896 dual step-down converter is optimized for powering the power amplifier (PA) and RF transceiver in WCDMA handsets. This device integrates a high-efficiency PWM step-down converter (OUT1) for medium and low-power transmission, and a 140mΩ (typ) bypass FET to power the PA directly from the battery during high-power transmission. A second high-efficiency PWM step-down converter (OUT2) supplies power directly to a high PSRR, low output noise, 200mA low-dropout linear regulator (LDO) to power the RF transceiver.

Fast switching allows the use of small ceramic input and output capacitors while maintaining low ripple voltage. The feedback network is integrated reducing external component count and total solution size. OUT1 uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. At high duty cycle, OUT1 automatically switches to bypass mode, connecting the input to the output through a low-impedance (140mΩ, typ) MOSFET.

OUT2 is a 2MHz fixed-frequency, step-down converter capable of operating at 100% duty cycle. Output accuracy is ±2% over load, line, and temperature. The output of OUT2 is preset to 3.1V to provide power to a 200mA, 2.8V LDO designed for low noise (16µV_RMS, typ), high PSRR (65dB, typ) operation. This configuration provides noise attenuation for the RF transceiver power supply in the 100Hz to 100kHz range.

Other features include separate output enables, low-supply current shutdown, output overcurrent, and overtemperature protection. The MAX8896 is available in a 16-bump, 2mm x 2mm UCSP™ package (0.7mm max height).

Data Sheet

Download	Rev 0	(PDF, 456kB)
E-Mail

An evaluation kit is available: MAX8896EVKIT

Key Features

PA Step-Down Converter (OUT1)
- 7.5µs (typ) Settling Time for 0.5V to 1V Output Voltage Change
- Dynamic Output Voltage Setting from 0.5V to V_BATT
- 140mΩ Bypass PFET and 100% Duty Cycle for Low Dropout
- 2MHz Switching Frequency
- Low Output Voltage Ripple
- 700mA (min) Output Drive Capability
- 2% Gain Accuracy
- Tiny External Components
RF Step-Down Converter (OUT2)
- 2MHz Fixed Switching Frequency
- 94% Peak Efficiency
- 100% Duty Cycle
- 2% Output Accuracy Over Load, Line, and Temperature
- 200mA (min) Output Drive Capability
- Tiny External Components
Low-Noise LDO
- Guaranteed 200mA Output
- High 65dB (typ) PSRR
- Fixed Output Voltage
- Low Noise (16µV_RMS, typ)
Simple Logic ON/OFF Controls
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Thermal Shutdown
2mm x 2mm UCSP Package (4 x 4 Grid)

Applications/Uses

Smartphones
WCDMA/NCDMA Cellular Handsets

Key Specifications:

Step-Down Switching Regulators

Part Number

V_IN
(V)

V_OUT
(V)

Preset V_OUT
(V)

Max. I_OUT
(A)

Output Adjust. Method

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX8896

2.7

5.5

0.5

2.8

3.1

0.7

Dyn. REF In

Preset

2000

UCSP(R)/16

4.5

$2.08 @1k

See All Step-Down Switching Regulators (284)

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.

Diagram

Typical Application Circuit

Reliability Reports

Reliability Report:	MAX8896.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
MAX8896EREE+T			Active	UCSP(R);16 pin;4.5 mm² Outline Drawing:21-0226 (PDF) Land Pattern: Not Available Use pkgcode/variation: R162A2+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

MAX8896EVKIT

Evaluation Kit for the MAX8896

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