MAX1556ETB/V+T Maxim Integrated Products, MAX1556ETB/V+T Datasheet

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MAX1556ETB/V+T

Manufacturer Part Number
MAX1556ETB/V+T
Description
IC DCDC CONV PWM STPDN 10TDFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX1557ETBT.pdf (12 pages)

Specifications of MAX1556ETB/V+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.75 ~ 5.5 V
Current - Output
1.2A
Frequency - Switching
1MHz
Voltage - Input
2.6 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-TDFN Exposed Pad
Power - Output
1.95W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1556/MAX1556A/MAX1557 are low-operating-
current (16µA), fixed-frequency step-down regulators.
High efficiency, 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/MAX1556A/MAX1557 contain a low-on-
resistance internal MOSFET switch and synchronous
rectifier to maximize efficiency and dropout perfor-
mance while minimizing external component count. A
proprietary topology offers the benefits of a high fixed-
frequency operation while still providing excellent effi-
ciency at both light and full loads. A 1MHz PWM
switching frequency keeps components small. Both
devices also feature an adjustable soft-start to minimize
battery transient loading.
The MAX1556/MAX1556A/MAX1557 are available in a
tiny 10-pin TDFN (3mm x 3mm) package.
19-3336; Rev 3; 1/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
INPUT
2.6V TO 5.5V
VOLTAGE
SELECT
PDAs and Palmtop Computers
Cell Phones and Smart Phones
Digital Cameras and Camcorders
Portable MP3 and DVD Players
Hand-Held Instruments
OFF
ON
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
INP
IN
D1
D2
SHDN
MAX1556A
MAX1556
MAX1557
General Description
GND
PGND
OUT
LX
SS
Applications
OUTPUT
0.75V TO V
Step-Down DC-DC Converters
IN
o Up to 97% Efficiency
o 95% Efficiency at 1mA Load Current
o Low 16µA Quiescent Current
o 1MHz PWM Switching
o Tiny 3.3µH Inductor
o Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V,
o 1.2A Guaranteed Output Current
o Voltage Positioning Optimizes Load-Transient
o Low 27µA Quiescent Current in Dropout
o Low 0.1µA Shutdown Current
o No External Schottky Diode Required
o Analog Soft-Start with Zero Overshoot Current
o Small, 10-Pin, 3mm x 3mm TDFN Package
* EP = Exposed paddle.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
T = Tape and reel.
MAX1556ETB+
MAX1556ETB/V+T
MAX1556AETB+
MAX1557ETB+
and Adjustable Output
(MAX1556/MAX1556A)
Response
PART
16µA I
TOP VIEW
SHDN
GND
OUT
SS
IN
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 TDFN-EP*
TEMP RANGE PIN-PACKAGE
1
2
3
4
5
Ordering Information
MAX1556A
Q
MAX1556
MAX1557
TDFN
Pin Configuration
, 1.2A PWM
10
9
8
7
6
D1
INP
LX
PGND
D2
Features
MARK
ACQ
AWS
TOP
ACR
AUJ
1

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MAX1556ETB/V+T Summary of contents

Page 1

... Low 0.1µA Shutdown Current o No External Schottky Diode Required o Analog Soft-Start with Zero Overshoot Current o Small, 10-Pin, 3mm x 3mm TDFN Package PART Applications MAX1556ETB+ MAX1556ETB/V+T MAX1556AETB+ MAX1557ETB Exposed paddle. + Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part Tape and reel. ...

Page 2

I , 1.2A PWM DC-DC Q Step-Down Converters ABSOLUTE MAXIMUM RATINGS IN, INP, OUT, D2, SHDN to GND ..........................-0.3V to +6.0V SS GND .............................................-0. PGND to GND .......................................................-0.3V to +0.3V LX Current (Note 1)...........................................................±2.25A Output ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3.6V -40°C to +85°C. Typical values are at T SHDN IN INP A PARAMETER MAX1556 IN GND; MAX1556A Line Regulation ...

Page 4

I , 1.2A PWM DC-DC Q Step-Down Converters = 3.6V SHDN = IN, Circuits of Figures 2 and INP EFFICIENCY vs. LOAD CURRENT WITH 3.3V OUTPUT 100 90 V ...

Page 5

SHDN = IN, Circuits of Figures 2 and INP LIGHT-LOAD SWITCHING WAVEFORMS MAX1556/7 toc10 20mV/div V OUT AC-COUPLED V 2V/div LX 0 200mA/div 4µs/div SOFT-START ...

Page 6

I , 1.2A PWM DC-DC Q Step-Down Converters PIN NAME 1 IN Supply Voltage Input. Connect to a 2.6V to 5.5V source. 2 GND Ground. Connect to PGND. Soft-Start Control. Connect a 1000pF capacitor (C overshoot during startup. C ...

Page 7

IN SHDN CURRENT Figure 1. Functional Diagram INPUT 2.6V TO 5.5V INP 10µF 100Ω MAX1556 MAX1556A IN PGND C4 0.47µF D1 VOLTAGE OUT SELECT OFF SHDN GND Figure 2. MAX1556 Typical Application Circuit _______________________________________________________________________________________ ...

Page 8

I , 1.2A PWM DC-DC Q Step-Down Converters As the load current decreases, the converters enter a pulse-skip mode in which the PWM comparator is dis- abled. At light loads, efficency is enhanced by a pulse-skip mode in which ...

Page 9

Table 2. Inductor Selection MANUFACTURER PART Taiyo Yuden LMNP04SB3R3N Taiyo Yuden LMNP04SB4R7N TOKO D52LC TOKO D52LC Sumida CDRH3D16 TOKO D412F Murata LQH32CN Sumitomo CXL180 Sumitomo CXLD140 * Estimated based upon similar-valued prototype inductors DROPOUT OUT ...

Page 10

I , 1.2A PWM DC-DC Q Step-Down Converters can be reduced by applying a correction factor to the feedback resistor equation. First, calculate the correction factor plugging the desired output voltage into the following formula: ⎛ V ...

Page 11

Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ 16µ 1.2A PWM DC-DC Q Step-Down Converters Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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