MAX1651ESA+ Maxim Integrated Products, MAX1651ESA+ Datasheet

IC STP-DWN DC-DC CTRLR LDO 8SOIC

MAX1651ESA+

Manufacturer Part Number
MAX1651ESA+
Description
IC STP-DWN DC-DC CTRLR LDO 8SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX1651ESA+

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V, 1.5 ~ 16 V
Current - Output
2.5A
Frequency - Switching
Up to 350kHz
Voltage - Input
3 ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
471mW
Output Voltage
3.3 V, 1.5 V to 16 V
Output Current
2.5 A
Input Voltage
3 V to 16 V
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1649/MAX1651 BiCMOS, step-down, DC-DC
switching controllers provide high efficiency over loads
ranging from 1mA to more than 2.5A. A unique, current-
limited pulse-frequency-modulated (PFM) control scheme
gives these devices the benefits of pulse-width-modula-
tion (PWM) converters (high efficiency at heavy loads),
while using only 100µA of supply current (vs. 2mA to
10mA for PWM converters). Dropout performance down
to 300mV is provided by a high switch duty cycle (96.5%)
and a low current-sense threshold (110mV).
A high switching frequency (up to 300kHz) allows these
devices to use miniature external components.
The MAX1649/MAX1651 have dropout voltages less
than 0.3V at 500mA and accept input voltages up to
16V. Output voltages are preset at 5V (MAX1649), or
3.3V (MAX1651). They can also be adjusted to any
voltage from 1.5V to the input voltage by using two
resistors.
These step-down controllers drive external P-channel
MOSFETs at loads greater than 12.5W. If less power is
required, use the MAX639/MAX640/MAX653 step-down
converters with on-chip FETs, which allow up to a
225mA load current.
________________________Applications
19-0305; Rev 3; 3/09
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.
__________Typical Operating Circuit
_______________General Description
ON/OFF
3.6V TO 16V
PDAs
High-Efficiency Step-Down Regulation
5V-to-3.3V Green PC Applications
Battery-Powered Applications
INPUT
Low-Dropout, Step-Down DC-DC Controllers
SHDN
REF
MAX1651
FB
________________________________________________________________ Maxim Integrated Products
GND
5V/3.3V or Adjustable, High-Efficiency,
OUT
EXT
V+
CS
P
OUTPUT
3.3V
♦ More than 90% Efficiency (10mA to 1.5A Loads)
♦ More than 12.5W Output Power
♦ Less than 0.3V Dropout Voltage at 500mA
♦ 100µA Max Quiescent Supply Current
♦ 5µA Max Shutdown Supply Current
♦ 16V Max Input Voltage
♦ 5V (MAX1649), 3.3V (MAX1651), or Adjustable
♦ Current-Limited Control Scheme
♦ Up to 300kHz Switching Frequency
♦ Up to 96.5% Duty Cycle
*Dice are tested at T
____________________________Features
______________Ordering Information
__________________Pin Configuration
MAX1649CPA
MAX1649CSA
MAX1649C/D
MAX1649EPA
MAX1649ESA
MAX1651CPA
MAX1651CSA
MAX1651C/D
MAX1651EPA
MAX1651ESA
Output Voltage
TOP VIEW
PART
SHDN
OUT
REF
FB
A
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
= +25°C.
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
1
2
3
4
MAX1649
MAX1651
DIP/SO
8
7
6
5
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
PIN-PACKAGE
GND
EXT
CS
V+
1

Related parts for MAX1651ESA+

MAX1651ESA+ Summary of contents

Page 1

... ON/OFF EXT OUT REF FB GND ________________________________________________________________ Maxim Integrated Products 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. ____________________________Features ♦ More than 90% Efficiency (10mA to 1.5A Loads) ♦ More than 12.5W Output Power ♦ Less than 0.3V Dropout Voltage at 500mA ♦ ...

Page 2

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ABSOLUTE MAXIMUM RATINGS Supply Voltage GND.......................................-0.3V, +17V REF, SHDN, FB, CS, EXT, OUT .......................-0.3V, (V+ + 0.3V) Continuous Power Dissipation (T = +70°C) A Plastic DIP (derate 9.09mW/°C above +70°C) ...

Page 3

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ELECTRICAL CHARACTERISTICS (continued) ( unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL Current-Limit Trip Level 3V ≤ V+ ≤ ...

Page 4

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A SWITCH ON-TIME vs. TEMPERATURE 34.0 33.5 33.0 32.5 32.0 31.5 31.0 30.5 30.0 -60 -40 - ...

Page 5

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A MAX1649 LINE-TRANSIENT RESPONSE 5ms/div CIRCUIT OF FIGURE LOAD 5V, 100mV/div, AC-COUPLED OUT B: V+ ...

Page 6

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers ______________________________________________________________Pin Description PIN NAME Sense Input for fixed 5V or 3.3V output operation. OUT is internally connected to the on-chip voltage divider. 1 OUT Although it is connected to the output of ...

Page 7

... EXT goes high, turning off the external MOSFET. SHDN is a logic-level input. Connect SHDN to GND for normal operation. Dual Mode is a trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ V+ ERROR COMPARATOR 1 ...

Page 8

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers 2μs/div V+ = 10V 1.3A LOAD CIRCUIT OF FIGURE 75mΩ Figure 3. MAX1649 Continuous-Conduction Mode, Heavy Load-Current Waveform (500mA/div) Modes of Operation When delivering high output currents, ...

Page 9

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers To maximize efficiency and reduce the size and cost of external components, minimize the peak current. However, since the available output current is a func- tion of the peak current, the peak ...

Page 10

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers Table 1. Component Selection Guide PRODUCTION INDUCTORS METHOD Sumida CDRH125-470 (1.8A) CDRH125-220 (2.2A) Surface Mount Coilcraft DO3316-473 (1.6A) DO3340-473 (3.8A) Miniature Sumida Through-Hole RCH875-470M (1.3A) Low-Cost Coilcraft Through-Hole PCH-45-473 (3.4A) The peak ...

Page 11

Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers Table 2. Component Suppliers COMPANY PHONE (207) 282-5111 AVX USA or (800) 282-4975 Coiltronics USA (516) 241-7876 Coilcraft USA (708) 639-6400 Dale USA (402) 564-3131 International USA (310) 322-3331 Rectifier IRC USA ...

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 © 2009 Maxim Integrated Products ...

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