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PDF MAX1556 Data sheet ( Hoja de datos )
| Número de pieza | MAX1556 | |
| Descripción | 16uA IQ 1.2A PWM Step-Down DC-DC Converters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1556 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-3336; Rev 0; 7/04
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
16µA IQ, 1.2A PWM
Step-Down DC-DC Converters
General Description
The MAX1556/MAX1557 are low-operating-current
(16µA), fixed-frequency step-down regulators. High effi-
ciency, low-quiescent operating current, low dropout,
and minimal (27µA) quiescent current in dropout make
these converters ideal for powering portable devices
from 1-cell Li-ion or 3-cell alkaline/NiMH batteries. The
MAX1556 delivers up to 1.2A; has pin-selectable 1.8V,
2.5V, and 3.3V outputs; and is also adjustable. The
MAX1557 delivers up to 600mA; has pin-selectable 1V,
1.3V, and 1.5V outputs; and is also adjustable.
The MAX1556/MAX1557 contain a low-on-resistance
internal MOSFET switch and synchronous rectifier to
maximize efficiency and dropout performance while
minimizing external component count. A proprietary
topology offers the benefits of a high fixed-frequency
operation while still providing excellent efficiency at
both light and full loads. A 1MHz PWM switching fre-
quency keeps components small. Both devices also
feature an adjustable soft-start to minimize battery tran-
sient loading.
The MAX1556/MAX1557 are available in a tiny 10-pin
TDFN (3mm x 3mm) package.
Applications
PDAs and Palmtop Computers
Cell Phones and Smart Phones
Digital Cameras and Camcorders
Portable MP3 and DVD Players
Hand-Held Instruments
Typical Operating Circuit
Features
♦ Up to 97% Efficiency
♦ 95% Efficiency at 1mA Load Current
♦ Low 16µA Quiescent Current
♦ 1MHz PWM Switching
♦ Tiny 3.3µH Inductor
♦ Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.0V, and
Adjustable Output
♦ 1.2A Guaranteed Output Current (MAX1556)
♦ Voltage Positioning Optimizes Load-Transient
Response
♦ Low 27µA Quiescent Current in Dropout
♦ Low 0.1µA Shutdown Current
♦ No External Schottky Diode Required
♦ Analog Soft-Start with Zero Overshoot Current
♦ Small, 10-Pin, 3mm x 3mm TDFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX1556ETB
-40°C to +85°C
10 TDFN-EP*
(T1033-1)
MAX1557ETB
-40°C to +85°C
10 TDFN-EP*
(T1033-1)
*EP = Exposed paddle.
ACQ
ACR
Pin Configuration
INPUT
2.6V TO 5.5V
VOLTAGE
SELECT
ON
OFF
INP LX
MAX1556/
MAX1557
PGND
IN
D1 OUT
D2
SS
SHDN
GND
OUTPUT
0.75V TO VIN
TOP VIEW
IN 1
GND 2
SS 3
OUT 4
SHDN 5
MAX1556/
MAX1557
10 D1
9 INP
8 LX
7 PGND
6 D2
TDFN
________________________________________________________________ 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  
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16µA IQ, 1.2A PWM DC-DC
Step-Down Converters
Typical Operating Characteristics (continued)
(VIN = VINP = 3.6V, D1 = D2 = SHDN = IN, Circuits of Figures 2 and 3, TA = +25°C, unless otherwise noted.)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1556/7 toc10
SOFT-START/SHUTDOWN WAVEFORMS
MAX1556/7 toc11
5V/div
20mV/div VSHDN
0
VOUT AC-COUPLED
VOUT CSS = 470pF
RLOAD = 4Ω
1V/div
0
VLX 2V/div
0 ILX
500mA/div
0
200mA/div
500mA/div
ILX 0 IIN 0
4µs/div
100µs/div
SOFT-START RAMP TIME vs. CSS
10
1
0.1
0
500 1000 1500 2000 2500
CSS (pF)
LOAD TRANSIENT
MAX1556/7 toc13
LOAD TRANSIENT
MAX1556/7 toc14
50mV/div
50mV/div
VOUT
AC-COUPLED
VOUT
AC-COUPLED
500mA/div
500mA/div
0
IOUT 0 IOUT
IOUTMIN = 20mA
IOUTMIN = 180mA
20µs/div
20µs/div
LINE TRANSIENT
MAX1556/7 toc15
BODE PLOT
40 240MAX1556/7 toc16
4V 30
VIN
20
3.5V
10
210
180
150
0 120
10mV/div
-10
90
VOUT
AC-COUPLED
-20
0dB 60
200mA/div
-30 PHASE MARGIN = 53°
-40
30
0
ILX
40µs/div
0
-50
COUT = 22µF, RLOAD = 4Ω
-60
-30
-60
0.1 1 10 100 1000
FREQUENCY (kHz)
_______________________________________________________________________________________ 5
5 Page 
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16µA IQ, 1.2A PWM DC-DC
Step-Down Converters
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.
PIN 1
INDEX
AREA
D
N
E E2
DETAIL A
CL
L
A
e
CL
L
e
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
F
1
2
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1556.PDF ] | |
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