MAX6841HUKD1+T Maxim Integrated, MAX6841HUKD1+T Datasheet

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MAX6841HUKD1+T

Manufacturer Part Number
MAX6841HUKD1+T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6841, MAX6842, MAX6843, MAX6844, MAX6845r
Datasheet

Specifications of MAX6841HUKD1+T

Number Of Voltages Monitored
1
Monitored Voltage
0.9 V to 1.5 V
Undervoltage Threshold
1.275 V
Overvoltage Threshold
1.35 V
Output Type
Active High, Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
2 ms
Supply Voltage - Max
1.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
571 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
8.1 uA
Supply Voltage - Min
0.75 V
The MAX1920/MAX1921 step-down converters deliver
over 400mA to outputs as low as 1.25V. These convert-
ers use a unique proprietary current-limited control
scheme that achieves over 90% efficiency. These
devices maintain extremely low quiescent supply current
(50µA), and their high 1.2MHz (max) operating frequency
permits small, low-cost external components. This combi-
nation makes the MAX1920/MAX1921 excellent high-
efficiency alternatives to linear regulators in space-
constrained applications.
Internal synchronous rectification greatly improves effi-
ciency and eliminates the external Schottky diode
required in conventional step-down converters. Both
devices also include internal digital soft-start to limit
input current upon startup and reduce input capacitor
requirements.
The MAX1920 provides an adjustable output voltage
(1.25V to 4V). The MAX1921 provides factory-preset
output voltages (see the Selector Guide). Both are
available in space-saving 6-pin SOT23 packages. The
MAX1920 is also available in a 6-pin TDFN package.
19-2296; Rev 3; 8/05
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.
2V TO 5.5V
INPUT
C
OFF
IN
ON
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
IN
AGND
SHDN
Typical Operating Circuit
MAX1921
________________________________________________________________ Maxim Integrated Products
PGND
OUT
General Description
LX
4.75kΩ
Applications
5600pF
4.7µH
Low-Voltage, 400mA Step-Down
1.5V UP TO 400mA
OUTPUT
4.7µF
DC-DC Converters in SOT23
♦ 400mA Guaranteed Output Current
♦ Internal Synchronous Rectifier for >90% Efficiency
♦ Tiny 6-Pin SOT23 Package
♦ Available in 6-Pin TDFN Package (MAX1920)
♦ Up to 1.2MHz Switching Frequency for Small
♦ 50µA Quiescent Supply Current
♦ 0.1µA Logic-Controlled Shutdown
♦ 2V to 5.5V Input Range
♦ Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output
♦ Adjustable Output Voltage (MAX1920)
♦ ±1.5% Initial Accuracy
♦ Soft-Start Limits Startup Current
Note: The MAX1921 offers five preset output voltage options.
See the Selector Guide, and then insert the proper designator
into the blanks above to complete the part number.
+Denotes lead-free package.
MAX1920EUT-T
MAX1920EUT+T
MAX1920ETT-T
MAX1920ETT+T
MAX1921EUT_ _-T
MAX1921EUT_ _+T
TOP VIEW
External Components
Voltages (MAX1921)
AGND
SHDN
IN
PART
1
2
3
( ) ARE FOR MAX1920 ONLY
A "+" sign will replace the first pin indicator on lead-free packages.
SOT23-6
MAX1920
MAX1921
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
4
6
5
Ordering Information
TEMP RANGE
LX
PGND
OUT (FB)
Pin Configuration
6
1
MAX1920
6 SOT23-6
6 SOT23-6
6 TDFN
6 TDFN
6 SOT23-6
6 SOT23-6
TDFN
PIN-PACKAGE
Features
5
2
4
3
1

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MAX6841HUKD1+T Summary of contents

Page 1

... AGND PGND ON SHDN OUT OFF ________________________________________________________________ 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-Voltage, 400mA Step-Down DC-DC Converters in SOT23 ♦ 400mA Guaranteed Output Current ♦ Internal Synchronous Rectifier for >90% Efficiency ♦ ...

Page 2

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 ABSOLUTE MAXIMUM RATINGS SHDN to AGND . . . . . . . . . . . . . . . . . . . . .-0.3V to +6V IN, FB, OUT to ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = 3.6V, SHDN = IN 0°C to +85°C. Typical parameters are PARAMETER SYMBOL Low-Side Current Limit High-Side On-Resistance Rectifier On-Resistance Rectifier Off-Current Threshold I LX Leakage Current LX Reverse Leakage ...

Page 4

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 (C = 2.2µF ceramic, Circuit of Figure 1, components of Table 1, unless otherwise noted.) IN SWITCHING FREQUENCY vs. LOAD (V = 1.8V) OUT 10,000 1000 100 3 ...

Page 5

PIN NAME Supply voltage input for MAX1921EUT15 and MAX1921EUT18 5.5V. Supply voltage input for 2 MAX1920 and other voltage versions of MAX1921 is 2.5V to 5.5V. Bypass IN to GND with ...

Page 6

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 Design Procedure The MAX1920/MAX1921 are optimized for small external components and fast transient response. There are several application circuits (Figures 1 through 4) to allow the choice between ceramic or tantalum output capacitor ...

Page 7

The input capacitor filters peak currents and noise at the voltage source and, therefore, must meet the input ripple requirements and voltage rating. Calculate the maximum RMS input current as: V OUT IN = × RMS ) ...

Page 8

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 Table 3. Component Suppliers SUPPLIER PHONE Coilcraft 847-639-6400 Kemet 408-986-0424 Murata 814-237-1431 USA 847-956-0666 Sumida Japan 81-3-3607-5111 USA 408-573-4150 Taiyo Yuden Japan 81-3-3833-5441 USA 847-297-0070 Toko Japan 81-3-3727-1161 MAX1921 Using Ceramic COUT When ...

Page 9

Selector Guide V (V) PART OUT MAX1920EUT Adjustable MAX1920ETT Adjustable MAX1921EUT33 3.3 MAX1921EUT30 3.0 MAX1921EUT25 2.5 MAX1921EUT18 1.8 MAX1921EUT15 1.5 (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, ...

Page 10

Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 (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.) COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 2.90 ...

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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2005 Maxim Integrated Products ...

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