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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1684 Datasheet

Low-Noise / 14V Input / 1A / PWM Step-Down Converters

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MAX1684 pdf
19-1454; Rev 0; 4/99
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
General Description
The MAX1684/MAX1685 are high-efficiency, internal-
switch, PWM step-down switching regulators intended to
power cellular phones, communicating PDAs, and
handy-terminals. These devices deliver a guaranteed 1A
output current from two Li-Ion 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 bat-
tery is removed. The output voltage is preset to 3.3V or
can be externally adjusted from 1.25V to VIN.
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
mode, normal mode, low-power mode, and shutdown
mode. The fixed-frequency PWM mode of operation
offers excellent noise characteristics. 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 current draw.
The MAX1684 runs at 300kHz for applications that
require highest efficiency. The MAX1685 runs at
600kHz to allow use of smaller external components.
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), see the MAX1692 data sheet.
Applications
Cellular Phones
2-Way Radios and Walkie-Talkies
Computer Peripherals
Personal Communicators
PDAs and Handy-Terminals
Pin Configuration appears at end of data sheet.
Features
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 0.24P-Channel On-Resistance
o Synchronizable Switching Frequency
o Fixed-Frequency PWM Operation
300kHz (MAX1684)
600kHz (MAX1685)
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
Adjustable Output (1.25V to VIN)
o Small 16-QSOP Package
o Auxiliary Output (CVL): 3V/5mA
Ordering Information
PART
MAX1684EEE
MAX1685EEE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuit
INPUT
2.7V TO 14V
+
IN LX
AIN MAX1684
SHDN MAX1685
GND
CVH
CVL
STBY
SYNC/PWM
BOOT
FB CC REF
OUTPUT
3.3V AT 1A
+
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1684 Datasheet

Low-Noise / 14V Input / 1A / PWM Step-Down Converters

No Preview Available !

MAX1684 pdf
Low-Noise, 14V Input, 1A, PWM
Step-Down Converters
ABSOLUTE MAXIMUM RATINGS
AIN to AGND ............................................................-0.3 to +15V
IN to PGND ................................................-0.3V to (VAIN + 0.3V)
LX to PGND .................................................-0.5V to (VIN + 0.3V)
PGND to AGND ..................................................................±0.3V
SHDN to AGND .........................................-0.3V to (VAIN + 0.3V)
ILIM/SS, FB, CC, BOOT, REF to AGND .....-0.3V to (VCVL+ 0.3V)
CVH to IN..................................................................-6V to +0.3V
CVL, STBY, SYNC/PWM to AGND............................-0.3V to +6V
Reference Current ..............................................................±1mA
CVL Current ..........................................................10mA to -1mA
LX Peak Current (Internally Limited) .....................................2.3A
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec ) ............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = V SHDN = +6V, STBY = SYNC/PWM = CVL, VBOOT = VOUT, FB = AGND, circuit of Figure 1, TA = 0°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Feedback Voltage
Output Voltage (3.3V mode)
Output Load Regulation
Output Current Capability
Output Adjust Range
FB Input Current
SYMBOL
VFB
VOUT
IFB
On-Resistance, P-Channel
On-Resistance, N-Channel
Current Limit in PWM Mode
Pulse-Skipping Current Threshold
ILIM
CONDITIONS
VFB = VOUT, ILOAD = 0 to 1A
FB = AGND, ILOAD = = 0 to 1A
VFB = VOUT, ILOAD = 0 to 1A
VIN = 5V to 14V
BOOT = AGND (Note 1)
VFB = 1.4V
High-side switch,
ILX = 1A
VIN = 6V
VIN = 2.7V
Low-side switch, VIN = 2.7V, ILX = 200mA
SYNC/PWM = low
MIN
2.7
1.238
3.3
1
VREF
-50
1.2
285
TYP
1.251
3.333
0.01
0.24
0.34
3
1.75
380
MAX
14
1.264
3.365
VIN
50
0.5
0.8
8
2.3
475
UNITS
V
V
V
%
A
V
nA
A
mA
Current Limit in Low-Power
Mode
ILIMLP STBY = low
285 380 475 mA
Current Limit, N-Channel
Zero Crossing Threshold
Quiescent Power Consumption
SYNC/PWM = high
SYNC/PWM = low
MAX1684
MAX1685
PWM mode,
SYNC/PWM = high,
VBOOT = 3.3V
(Note 2)
MAX1684
MAX1685
Normal mode, SYNC/PWM = low,
VBOOT = 3.3V (Note 2)
Low-power mode, STBY = low,
VBOOT = 3.3V (Note 2)
0.15 0.4
20 50
40 80
13
25
0.9
0.9 A
80
mA
120
33
65
mW
2
0.14 0.27
2 _______________________________________________________________________________________


Part Number MAX1684
Description Low-Noise / 14V Input / 1A / PWM Step-Down Converters
Maker Maxim
Total Page 16 Pages
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