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PDF MAX8582 Data sheet ( Hoja de datos )
| Número de pieza | MAX8582 | |
| Descripción | (MAX8581 / MAX8582) Step-Down Converters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX8582 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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19-0593; Rev 0; 11/06
EVAALVUAAILTAIOBNLEKIT 2.5MHz/1.5MHz Step-Down Converters
with 60mΩ Bypass in TDFN for CDMA PA Power
General Description
The MAX8581/MAX8582 high-frequency step-down con-
verters are optimized for dynamically powering the power
amplifier (PA) in CDMA handsets. They integrate a high-
efficiency PWM step-down converter for medium- and
low-power transmission and a 60mΩ (typ) bypass mode
to power the PA directly from the battery during high-
power transmission. They use an analog input driven by
an external DAC to control the output voltage linearly for
continuous PA power adjustment. The MAX8581/
MAX8582 use an internal feedback network, and the
switching frequency is internally set to 2.5MHz and
1.5MHz, respectively.
Fast switching (up to 2.5MHz) and fast soft-start allow
the use of ceramic 2.2µF input and output capacitors
while maintaining low voltage ripple. The small 1.5µH to
3.3µH inductor size can be optimized for efficiency.
The MAX8581/MAX8582 are available in 10-pin, 3mm x
3mm TDFN packages (0.8mm max height).
Features
♦ 600mA Step-Down Converter
♦ 60mΩ (typ) Bypass Mode with Integrated FET
♦ Dynamically Adjustable Output from 0.4V to VIN
♦ 2.5MHz and 1.5MHz Switching Frequency
♦ Small LC Components: 1.5µH to 3.3µH and 2.2µF
♦ Up to 94% Efficiency
♦ Low Output Ripple at All Loads
♦ 2.7V to 5.5V Input
♦ 0.1µA Shutdown Mode
♦ Output Short-Circuit Protection
♦ Thermal Shutdown
♦ 10-Pin, 3mm x 3mm TDFN Packag
Applications
WCDMA/NCDMA Cell Phones
Wireless PDAs, Smartphones
Ordering Information
PART*
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX8581ETB+
10 TDFN-EP** ACT
T1033-1
MAX8582ETB+
10 TDFN-EP** ACU
T1033-1
*All devices are specified in the -40°C to +85°C extended
temperature range.
**EP = Exposed pad.
+Denotes lead-free package.
Typical Operating Circuit
INPUT
Li+ BATTERY
2.2μF
ON/OFF
ANALOG
CONTROL
OUTPUT
0.4V TO VBATT
IN OUT
1.5μH OR 3.3μH
MAX8581 LX
MAX8582
GND
2.2μF
SHDN
REFIN
HP FORCED BYPASS
TOP VIEW
Pin Configuration
10 9 8 7 6
MAX8581/
MAX8582
+1 2 3 4 5
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
2.5MHz/1.5MHz Step-Down Converters
with 60mΩ Bypass in TDFN for CDMA PA Power
Typical Operating Characteristics (continued)
(VIN = 3.6V, VOUT = 1.2V, MAX8582 EV Kit, TA = +25°C, unless otherwise noted.)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX8581/2 toc09
ILOAD = 50mA
ILX 100mA/div
0A
VOUT 20mV/div
AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
MAX8581/2 toc10
600mA
ILX 400mA
ILOAD = 500mA
200mA
VOUT
20mV/div
AC-COUPLED
2V/div
VLX 0V
200ns/div
VLX 2V/div
0V
200ns/div
VSHDN
VOUT
IIN
ILX
SOFT-START WAVEFORMS
MAX8581/2 toc11
2V
2V/div
1V/div
0V
VIN
VOUT
100mA/div
0A
500mA/div
0A ILX
20μs/div
LINE-TRANSIENT WAVEFORMS
MAX8581/2 toc12
RLOAD = 7.5Ω
4V
3V
VOUT
20μs/div
50mV/div
AC-COUPLED
IOUT
200mA/div
0A
LOAD TRANSIENT
MAX8581/2 toc13
50mV/div
AC-COUPLED
20μs/div
100mA/div
0A
VOUT
VREFIN
ILX
REFIN TRANSIENT RESPONSE
MAX8581/2 toc14
RLOAD = 7.5Ω
2V
REFIN TRANSIENT WITH AUTOBYPASS
MAX8581/2 toc15
RLOAD = 7.5Ω
VOUT
2V/div
0V
VOUT
1V VREFIN
1V
1V/div
0V
VHP
0.5V ILX
500mA/div
0A
ILX
20μs/div
200mA/div
IOUT
0A
20μs/div
500mA/div IOUT
0A
HP TRANSIENT RESPONSE
WITH FORCED AUTOBYPASS
MAX8581/2 toc16
RLOAD = 7.5Ω
VREFIN = 0.6V 2V/div
0V
1V/div
0V
500mA/div
0A
20μs/div
500mA/div
0A
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX8582.PDF ] | |
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