MAX8815AETB+T Maxim Integrated Products, MAX8815AETB+T Datasheet

IC DC/DC CONV STP UP 10TDFN-EP

MAX8815AETB+T

Manufacturer Part Number
MAX8815AETB+T
Description
IC DC/DC CONV STP UP 10TDFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet
1.MAX8815AETBT.pdf (15 pages)

Specifications of MAX8815AETB+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3 ~ 5 V
Current - Output
1A
Frequency - Switching
2MHz
Voltage - Input
1.2 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-TDFN Exposed Pad
Power - Output
1.48W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8815A DC-DC step-up converter is a high-effi-
ciency, low quiescent current, synchronous step-up
converter with True Shutdown™ and inrush-current lim-
iting. The MAX8815A generates any output voltage
from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell
Li+/Li polymer battery.
The MAX8815A uses two modes of operation. The first
mode of operation (normal) uses only 30µA (typ) quies-
cent current and allows the converter to switch only
when needed at no load and light loads. Under moder-
ate and heavy loads (typically above 90mA), the
MAX8815A uses a fixed-frequency pulse-width modula-
tion (PWM) technique. This mode allows maximum effi-
ciency at light loads. The second mode of operation is
a fixed-frequency forced-pulse-width modulation
(FPWM) mode where the converter switches at a fixed
frequency irrespective of the load. This mode allows for
easy noise filtering and lower output ripple.
The MAX8815A has a preset 2.5A current limit, allowing
500mA load at 1.8V input and 1A load at 2.5V input when
the output is set to 5V. Features include soft-start, which
limits inrush current during startup, True Shutdown, and
internal compensation. The MAX8815A is available in a
compact 10-pin, 3mm x 3mm TDFN package.
The MAX8815A evaluation kit can help shorten the time
required for system design.
19-4092; Rev 1; 8/08
True Shutdown is a trademark of Maxim Integrated Products, Inc.
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.
DSC and DVC
Microprocessor/DSP Core Power
Cell Phones, PDAs, MP3 Players
Portable Handheld Devices
PCMCIA Cards
1A, 97% Efficiency, 30µA Quiescent Current
TOP VIEW
________________________________________________________________ Maxim Integrated Products
+
10
1
Step-Up Converter with True Shutdown
General Description
9
MAX8815A
2
EVALUATION KIT
8
3
AVAILABLE
Pin Configuration
4
7
6
5
Applications
♦ Up to 97% Efficiency with Internal Synchronous
♦ Low 30µA Quiescent Current
♦ Guaranteed 500mA Output Current at V
♦ Guaranteed 1A Output Current at 5V from 2.5V
♦ Low-Noise Constant Frequency Operation (FPWM
♦ 2MHz PWM Switching Frequency
♦ Preset (5V) or Adjustable Output
♦ Controlled Current in Soft-Start Limits Inrush
♦ True Shutdown
♦ Internal Compensation
♦ Overload/Short-Circuit Protection
♦ 0.1µA Shutdown Current
♦ Thermal Shutdown
♦ Compact 10-Pin, 3mm x 3mm TDFN Package
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
Note: This device operates in the -40°C to +85°C extended
operating temperature range.
MAX8815AETB+
INPUT VOLTAGE
Rectifier
from 1.8V Input
Input
Mode)
Current
1.2V TO 5.5V
PART
Simplified Operating Circuit
BATT
ON
SKIPB
Ordering Information
PIN-PACKAGE
10 TDFN-EP*
MAX8815A
POUT
OUTS
GND
LX
FB
Features
TOP MARK
OUT
OUTPUT VOLTAGE
5V UP TO 1A
AUH
= 5V
1

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MAX8815AETB+T Summary of contents

Page 1

... The MAX8815A evaluation kit can help shorten the time required for system design. DSC and DVC Microprocessor/DSP Core Power Cell Phones, PDAs, MP3 Players Portable Handheld Devices PCMCIA Cards True Shutdown is a trademark of Maxim Integrated Products, Inc. Pin Configuration TOP VIEW ...

Page 2

... V BATT Input Leakage Current V POUT Idle Mode™ Trip Level (Note 4) Idle Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ 10-Pin TDFN Multilayer Board (derate 24.4 mW/°C above +70°C)...........................................................1951.2mW Junction-to-Case Thermal Resistance (θ + 0.3V) 10-Pin TDFN .................................................................8.5°C/W OUT + 0.3V) Junction-to-Ambient Thermal Resistance (θ ...

Page 3

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ELECTRICAL CHARACTERISTICS (continued 5V 3.6V, V OUTS POUT ON BATT noted. Limits are 100% production tested at T characterization.) PARAMETER DC-DC ...

Page 4

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON EFFICIENCY vs. LOAD CURRENT, V 100 ...

Page 5

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON EP TEMPERATURE vs. INPUT VOLTAGE 120 OUT T = +25°C A ...

Page 6

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown ( 5V 3.6V, V OUTS POUT BATT ON HEAVY-LOAD SWITCHING WAVEFORMS V OUT 200ns/div LIGHT-LOAD SWITCHING WAVEFORMS (SKIPB ...

Page 7

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown PIN NAME Inductor Connection. LX pins are internally connected. Connect the LX pins to the switched side the inductor high impedance in shutdown. ...

Page 8

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown 3V + OUTS - ON ON GND REFERENCE Detailed Description The MAX8815A current-mode step-up DC-DC switching converter uses a fixed-frequency PWM architecture with True Shutdown. In normal mode, the ...

Page 9

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown INPUT VOLTAGE 1.2V TO 5.5V C1 10μF NORM INPUT VOLTAGE 1.2V TO 5.5V C1 10μF Figure 1. Typical Application Circuits _______________________________________________________________________________________ L 2μ BATT LX 9, ...

Page 10

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown DC-DC Converter The MAX8815A uses a current-mode PWM control scheme. The voltage difference between FB and an internal 1.265V (typ) reference generates an error sig- nal that programs the ...

Page 11

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown LOAD TRANSIENT MAX8815A toc18 V OUT 800mA I OUT 10mA 1ms/div Figure 2. Load Regulation 9% (a) HIGH-GAIN DC LOAD REGULATION WITH POOR TRANSIENT RESPONSE 3% (b) VOLTAGE POSITIONING ...

Page 12

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown Inductor Selection In most step-up converter designs, a reasonable induc- tor value can be derived from the following equation. This equation sets peak-to-peak inductor current at 1/2 the DC ...

Page 13

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown For the latest package outline information and land patterns www.maxim-ic.com/packages. ______________________________________________________________________________________ Package Information 13 ...

Page 14

Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown For the latest package outline information and land patterns www.maxim-ic.com/packages. COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 2.90 3.10 E 2.90 3.10 A1 0.00 0.05 ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2008 Maxim Integrated Products ...

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