MAX1684EEE+ Maxim Integrated Products, MAX1684EEE+ Datasheet

IC BUCK SYNC 3.3V/ADJ 1A 16QSOP

MAX1684EEE+

Manufacturer Part Number
MAX1684EEE+
Description
IC BUCK SYNC 3.3V/ADJ 1A 16QSOP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX1684EEE+

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V, 1.25 ~ 14 V
Current - Output
1A
Frequency - Switching
300kHz
Voltage - Input
2.7 ~ 14 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Power - Output
667mW
Input Voltage
2.7 V to 14 V
Supply Current
150 uA
Switching Frequency
300 KHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1684/MAX1685 are high-efficiency, internal-
switch, pulse-width modulation (PWM) step-down switch-
ing regulators intended to power cellular phones,
communicating PDAs, and handy-terminals. These
devices deliver a guaranteed 1A output current from two
lithium-ion (Li+) batteries. Their wide-input voltage range
of 2.7V to 14V gives design flexibility and allows batteries
to charge from a wall cube, since the ICs operate at the
higher voltages that occur when the battery is removed.
The output voltage is preset to 3.3V or can be externally
adjusted from 1.25V to V
The low on-resistance power switch and built-in synchro-
nous rectifier provide high efficiencies of up to 96%.
There are four modes of operation: fixed-frequency, nor-
mal, low-power, and shutdown. The fixed-frequency
PWM mode of operation offers excellent noise character-
istics. The normal mode maintains high efficiency at all
loads. The low-power mode is used to conserve power in
standby or when full load is not required. The shutdown
mode is used to power down the device for minimal cur-
rent draw.
The MAX1684 runs at 300kHz for applications that
require highest efficiency. The MAX1685 runs at
600kHz to allow the use of smaller external compo-
nents. These devices can also be synchronized to an
external clock. Other features include a 100% duty
cycle for low-dropout applications, an auxiliary 3V/5mA
output, and a 1% accurate reference.
Both devices are available in a space-saving 16-QSOP
package. An evaluation kit is also available to help
speed designs. For a similar device in a 10-pin µMAX
package with lower input voltage requirements (5.5V
max), refer to the MAX1692 data sheet.
19-1454; Rev 2; 7/01
Pin Configuration appears at end of data sheet.
Dual Mode 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.
Cellular Phones
Two-Way Radios and Walkie-Talkies
Computer Peripherals
Personal Communicators
PDAs and Handy-Terminals
________________________________________________________________ Maxim Integrated Products
General Description
IN
.
Applications
Low-Noise, 14V Input, 1A, PWM
o Up to 96% Efficiency
o 1A Guaranteed Output Current
o 100% Duty Cycle in Dropout
o 2.7V to 14V Input Range (15V Absolute Max)
o ±1% Accurate Reference Output
o 0.24Ω P-Channel On-Resistance
o Synchronizable Switching Frequency
o Fixed-Frequency PWM Operation
o 150µA Normal-Mode Quiescent Current
o 25µA Low-Power Mode Quiescent Current
o 2µA Shutdown Current
o Dual Mode™ Fixed 3.3V (±1%) Output or
o Small 16-QSOP Package
o Auxiliary Output (CVL): 3V/5mA
Step-Down Converters
MAX1684EEE
MAX1685EEE
INPUT
2.7V TO 14V
Adjustable Output (1.25V to V
300kHz (MAX1684)
600kHz (MAX1685)
+
PART
IN
AIN
SHDN
CVH
CVL
STBY
SYNC/PWM
Typical Operating Circuit
FB
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
MAX1684
MAX1685
Ordering Information
CC
BOOT
REF
GND
LX
IN
)
16 QSOP
16 QSOP
PIN-PACKAGE
Features
OUTPUT
3.3V AT 1A
+
1

Related parts for MAX1684EEE+

MAX1684EEE+ Summary of contents

Page 1

... Computer Peripherals Personal Communicators PDAs and Handy-Terminals Pin Configuration appears at end of data sheet. Dual Mode 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. ...

Page 2

Low-Noise, 14V Input, 1A, PWM Step-Down Converters ABSOLUTE MAXIMUM RATINGS AIN to AGND ............................................................-0.3 to +15V IN to PGND ................................................-0. PGND .................................................-0. PGND to AGND ..................................................................±0.3V SHDN to AGND .........................................-0. ILIM/SS, FB, ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = 6V, STBY = SYNC/PWM = CVL SHDN IN noted. Typical values are +25°C.) A PARAMETER SYMBOL Quiescent Supply Current in Dropout Shutdown Supply Current LX Leakage Current I Oscillator ...

Page 4

Low-Noise, 14V Input, 1A, PWM Step-Down Converters ELECTRICAL CHARACTERISTICS = 6V, STBY = SYNC/PWM = CVL SHDN IN wise noted.) (Note 5) PARAMETER SYMBOL Input Voltage Range Output Feedback Voltage V FB Output Voltage (3.3V Mode) ...

Page 5

Figure +25°C, unless otherwise noted.) A MAX1684 EFFICIENCY vs. LOAD CURRENT (V = 3.3V 1.8V, 2.5V) IN OUT 100 ...

Page 6

Low-Noise, 14V Input, 1A, PWM Step-Down Converters (Circuit of Figure +25°C, unless otherwise noted.) A MAXIMUM LOAD CURRENT vs. INPUT VOLTAGE 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 PWM OR NORMAL MODE 1 ...

Page 7

Figure +25°C, unless otherwise noted.) A LINE-TRANSIENT RESPONSE V IN 5V/div 0V V OUT 100mV/div 2ms/div MAX1684 100mA 10V, LOAD IN SYNC/PWM = 3.3V PIN NAME 1 CVH High-Side ...

Page 8

Low-Noise, 14V Input, 1A, PWM Step-Down Converters 0.1µF 1 INPUT 14V MAX CVH 13 22µF 2 AIN 16 0.1µF MAX1685 PGND 5 AGND ON/OFF 15 SHDN 4 12 CVL BOOT 11 1µF STBY ...

Page 9

ILIM/SS IN AIN THERMAL SHDN VL SHUTDOWN CVL REF REF UNDERVOLTAGE COMPARATOR 2.5V OSC SYNC/PWM SYNC SLOPE COMPENSATION AND STANDBY PWM MODE CONTROL NORMAL MODE STBY LOW-POWER MODE CC GM INTEGRATOR Figure 2. Functional Diagram _______________________________________________________________________________________ Low-Noise, 14V Input, 1A, ...

Page 10

Low-Noise, 14V Input, 1A, PWM Step-Down Converters inductor peak current during the first half of each cycle, based on the output error voltage. The MAX1684/ MAX1685s’ loop gain is relatively low to enable the use of a small, low-value output ...

Page 11

The output current capability for each mode is deter- mined by the following equations: ✕ 0.5 I OUTMAX LIM RIPPLE modes) ✕ 0.5 I (for low-power mode) OUTMAX LIMLP where ripple current ...

Page 12

Low-Noise, 14V Input, 1A, PWM Step-Down Converters capacitors have the lowest ESR of the high-value elec- trolytic types. Use ceramic and OS-CON capacitors for very compact, high-reliability, or wide-temperature applications, where expense is justified. When using very low ESR capacitors, ...

Page 13

Interchanging the ground and V OUT a negative voltage supply (Figure 4). The component selections are the same as for a positive voltage con- verter. The absolute maximum ratings limit the output voltage range to -1.25V to -5.5V and the ...

Page 14

... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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