MAX1947ETA33+T Maxim Integrated Products, MAX1947ETA33+T Datasheet

IC DC-DC CONV 3.3V 8-TDFN

MAX1947ETA33+T

Manufacturer Part Number
MAX1947ETA33+T
Description
IC DC-DC CONV 3.3V 8-TDFN
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet
1.MAX1947ETA30T.pdf (11 pages)

Specifications of MAX1947ETA33+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
250mA
Frequency - Switching
Up to 2MHz
Voltage - Input
0.7 ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TDFN Exposed Pad
Power - Output
1.95W
Output Voltage
3.3 V
Output Current
169 mA
Input Voltage
0.7 V to 3.6 V
Supply Current
70 uA
Switching Frequency
650 KHz
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX1947ETA33+T
The MAX1947 is a compact, high-efficiency, step-up DC-
DC converter that regulates output voltages from 1.8V to
3.3V to power µP/DSP cores, memory, and I/O rails in 1-
and 2-cell alkaline/NiMH/NiCd battery-powered systems.
It features an internal 800mA switch and synchronous
rectifier to achieve up to 94% efficiency and to eliminate
the need for an external Schottky diode.
High-frequency switching (up to 2MHz) results in low
ripple and small external components, while automatic
pulse skipping at light loads reduces supply current to
just 70µA for extended battery life. Maxim’s proprietary
True Shutdown™ reduces supply current to just 2µA
and fully discharges the output to ground. The convert-
er is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V,
and 3.3V, requiring no feedback or compensation net-
work. A 75ms RESET output flag provides for power-on
reset (POR) and undervoltage detection. The MAX1947
is available in a space-saving 8-pin TDFN package.
19-3086; Rev 2; 10/06
True Shutdown is a trademark of Maxim Integrated Products, Inc.
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.
V
+0.7V TO +V
MP3 Players, Pagers, and CD Players
PDAs and Organizers
Digital Still Cameras
Cordless Phones
Wireless Mice/Keyboards
Portable Medical Equipment
Other Battery-Powered Systems
IN
2.2μF
Typical Application Circuit
OUT
________________________________________________________________ Maxim Integrated Products
4.7μH
General Description
BATT
SHDN
Step-Up DC-DC Converter with RESET
MAX1947
LX
RESET
GND
PGND
OUT
Applications
V
+1.8V, +2.5V,
+3.0V, +3.3V
10μF
OUT
Low Input/Output Voltage
♦ Low Input (0.7V) and Output (1.8V) Voltage
♦ Internal Synchronous Rectifier
♦ High 94% Efficiency
♦ Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
♦ Up to 2MHz Switching Allows Small External
♦ Automatic Pulse Skipping at Light Loads for
♦ Low 70µA (typ) Operating Supply Current
♦ Low 2µA Logic-Controlled Shutdown
♦ True Shutdown Fully Discharges Output to Ground
♦ Uses Only Small Ceramic Capacitors
♦ 75ms RESET Output Flag
MAX1947ETAxy*+T -40°C to +85°C 8 TDFN 3mm x 3mm T833-1
*xy represents the output voltage code (e.g., 18 =1.8V).
Standard output voltages include 3.3V (33), 3.0V (30), 2.5V
(25), and 1.8V (18). Contact the factory for other output voltages
in 100mV increments between 1.8V and 3.3V; the minimum
order quantity is 25,000 units.
+Denotes lead-free package.
MAX1947ETAxy*-T
Capability
Components and Low Output Ripple
Extended Battery Life
(Measured at OUT)
PART
TOP VIEW
RESET
SHDN
GND
GND
PIN INDICATOR ON LEAD-FREE PACKAGES.
-40°C to +85°C 8 TDFN 3mm x 3mm T833-1
TEMP RANGE
A "+" SIGN WILL REPLACE THE FIRST
1
2
4
3
Ordering Information
3mm x 3mm
MAX1947
TDFN
Pin Configuration
PIN-PACKAGE
6
8
7
5
BATT
OUT
LX
PGND
Features
CODE
PKG
1

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MAX1947ETA33+T Summary of contents

Page 1

... MAX1947 SHDN PGND RESET GND True Shutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. Low Input/Output Voltage ♦ Low Input (0.7V) and Output (1.8V) Voltage Capability ♦ ...

Page 2

Low Input/Output Voltage Step-Up DC-DC Converter with RESET ABSOLUTE MAXIMUM RATINGS BATT, OUT, SHDN to GND ...................................-0.3V to +4.0V RESET to GND..........................................-0. PGND to GND .......................................................-0.3V to +0.3V Switch Current ( (Note 1) ...

Page 3

Step-Up DC-DC Converter with RESET ELECTRICAL CHARACTERISTICS (continued 1.5V -40°C to +85°C, unless otherwise noted. Typical values are at T BATT A PARAMETER Startup to Normal-Mode Output 50mV hysteresis, rising edge Transition Voltage T A NFET ...

Page 4

Low Input/Output Voltage Step-Up DC-DC Converter with RESET (V = 1.5V, Circuit of Typical Application Circuit MAX1947ETA18 EFFICIENCY vs. LOAD CURRENT 100 1. 1.25V ...

Page 5

Step-Up DC-DC Converter with RESET (V = 1.5V, Circuit of Typical Application Circuit OUTPUT VOLTAGE vs. LOAD CURRENT 1.84 1.82 1.80 1.78 1.76 1. 100 150 200 250 300 LOAD CURRENT (mA) HEAVY-LOAD SWITCHING WAVEFORMS V ...

Page 6

Low Input/Output Voltage Step-Up DC-DC Converter with RESET (V = 1.5V, Circuit of Typical Application Circuit POWER-ON RESET WAVEFORMS RESET V OUT 20ms/div PIN NAME Active-Low Push-Pull Reset Output. RESET goes high 75ms (min) after ...

Page 7

Step-Up DC-DC Converter with RESET BATT SHDN MAX TIMER MIN TIMER The MAX1947 is a bootstrapped design. Upon turn-on, a startup oscillator brings the output voltage high enough to allow the main DC-DC circuitry to run. Once the output voltage ...

Page 8

Low Input/Output Voltage Step-Up DC-DC Converter with RESET Table 1. Suggested Component Values APPLICATION LOAD ≤50% full load 1-Cell Input, Output < 2.7V >50% full load ≤50% full load 1-Cell Input, Output > 2.7V >50% full load ≤50% full load ...

Page 9

Step-Up DC-DC Converter with RESET Calculate the maximum output current (I inductor ripple current (I ) and duty cycle (D) as RIPPLE follows: + × OUT LIM DS ON PFET ( ) = I RIPPLE ( ...

Page 10

Low Input/Output Voltage Step-Up DC-DC Converter with RESET (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 10 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, 6,8,10 & 14L, ...

Page 11

... 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. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products ...

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