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MAX8715EUA+

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The MAX1790/MAX8715 boost converters incorporate
high-performance (at 1.2MHz), current-mode, fixed-fre-
quency, pulse-width modulation (PWM) circuitry with a
built-in 0.21Ω/0.15Ω n-channel MOSFET to provide a high-
ly efficient regulator with fast response.
High switching frequency (640kHz or 1.2MHz selectable)
allows easy filtering and faster loop performance. An
external compensation pin provides the user flexibility in
determining loop dynamics, allowing the use of small, low
equivalent-series-resistance (ESR) ceramic output capaci-
tors. The device can produce an output voltage as high as
12V from an input as low as 2.6V.
Soft-start is programmed with an external capacitor, which
sets the input-current ramp rate. In shutdown mode, cur-
rent consumption is reduced to 0.1µA. The MAX1790/
MAX8715 are available in a space-saving 8-pin µMAX
®
package. The ultra-small package and high switching fre-
quency allow the total solution to be less than 1.1mm high.
Applications
LCD Displays
PCMCIA Cards
Portable Applications
Hand-Held Devices
Features
♦ 90% Efficiency
♦ Adjustable Output from V
IN
to 12V
♦ 1.6A, 0.21Ω, 14V Power MOSFET (MAX1790)
♦ 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715)
♦ +2.6V to +5.5V Input Range
♦ Pin-Selectable 640kHz or 1.2MHz Switching
Frequency
♦ 0.1µA Shutdown Current
♦ Programmable Soft-Start
♦ Small 8-Pin µMAX Package
MAX1790/MAX8715
Low-Noise Step-Up DC-DC Converters
________________________________________________________________ Maxim Integrated Products 1
IN
LXGND
1
2
8
7
SS
FREQFB
COMP
μMAX
TOP VIEW
3
4
6
5
MAX1790
MAX8715
SHDN
LX
IN
V
IN
2.6V TO 5V
GND
FREQ
V
OUT
COMP
SHDN
FB
MAX1790
MAX8715
ON/OFF
SS
Typical Operating Circuit
19-1563; Rev 3; 9/05
Pin Configuration
Ordering Information
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX1790EUA -40°C to +85°C 8 µMAX
MAX1790EUA+ -40°C to +85°C 8 µMAX
MAX8715EUA -40°C to +85°C 8 µMAX
MAX8715EUA+ -40°C to +85°C 8 µMAX
µMAX is a registered trademark of Maxim Integrated Products,
Inc.
+ Denotes lead-free package.
MAX1790/MAX8715
Low-Noise Step-Up DC-DC Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= SHDN = 3V, FREQ = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
LX to GND ..............................................................-0.3V to +14V
IN, SHDN, FREQ, FB to GND ................................-0.3V to +6.2V
SS, COMP to GND.......................................-0.3V to (V
IN
+ 0.3V)
RMS LX Pin Current ..............................................................1.2A
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Range
MAX1790EUA/MAX8715EUA ........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Supply Range V
IN
2.6 5.5 V
V
IN
Undervoltage Lockout UVLO
V
IN
rising, typical hysteresis is 40mV,
LX remains off below this level
2.25 2.38 2.52
V
V
FB
= 1.3V, not switching 0.18 0.35
MAX1790
V
FB
= 1.0V, switching 2 5
V
FB
= 1.3V, not switching 0.21 0.35
Quiescent Current I
IN
MAX8715
V
FB
= 1.0V, switching 2.5 5.0
mA
Shutdown Supply Current I
IN
SHDN = GND 0.1 10 µA
ERROR AMPLIFIER
Feedback Voltage V
FB
Level to produce V
COMP
= 1.24V
1.222 1.24 1.258
V
MAX1790 0 40
FB Input Bias Current I
FB
V
FB
= 1.24V
MAX8715
125 190
nA
Feedback-Voltage Line
Regulation
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
0.05 0.15
%/V
MAX1790 70
140 240
Transconductance g
m
ΔI = 5µA
MAX8715 70
160 240
µS
Voltage Gain A
V
700
V/V
OSCILLATOR
FREQ = GND
540 640 740
Frequency f
OSC
FREQ = IN
1000 1220 1500
kHz
FREQ = GND
79 85 92
Maximum Duty Cycle DC
FREQ = IN 84
%
N-CHANNEL SWITCH
MAX1790 1.2 1.6 2.3
Current Limit I
LIM
V
FB
= 1V,
duty cycle =
65% (Note 1)
MAX8715 1.8 2.4 3.4
A
MAX1790
0.21
0.5
On-Resistance R
ON
MAX8715
0.15 0.35
Ω
MAX1790
0.01
20
Leakage Current I
LXOFF
V
LX
= 12V
MAX8715 5 30
µA
MAX1790/MAX8715
Low-Noise Step-Up DC-DC Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
IN
= SHDN = 3V, FREQ = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= SHDN = 3V, FREQ = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
MAX1790
0.30 0.45 0.65
Current-Sense Transresistance R
CS
MAX8715
0.20 0.30 0.43
V/A
SOFT-START
Reset Switch Resistance
100
Ω
Charge Current V
SS
= 1.2V 1.5 4 7.0 µA
CONTROL INPUTS
Input Low Voltage V
IL
SHDN, FREQ
0.3 x V
IN
V
Input High Voltage V
IH
SHDN, FREQ
0.7 x V
IN
V
Hysteresis SHDN, FREQ
0.1 x V
IN
V
FREQ Pulldown Current I
FREQ
1.8 5 9.0 µA
SHDN Input Current I
SHDN
0.001
1µA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Supply Range V
IN
2.6 5.5 V
V
IN
Undervoltage Lockout UVLO
V
IN
rising, typical hysteresis is 40mV,
LX remains off below this level
2.25 2.52 V
V
FB
= 1.3V, not switching 0.35
MAX1790
V
FB
= 1.0V, switching 5
V
FB
= 1.3V, not switching 0.35
Quiescent Current I
IN
MAX8715
V
FB
= 1.0V, switching 5
mA
Shutdown Supply Current I
IN
SHDN = GND 10 µA
ERROR AMPLIFIER
Feedback Voltage V
FB
Level to produce V
COMP
= 1.24V 1.215 1.24 1.260 V
MAX1790 40
FB Input Bias Current I
FB
V
FB
= 1.24V
MAX8715 190
nA
Feedback-Voltage Line
Regulation
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
0.15 %/V
MAX1790 70 260
Transconductance g
m
ΔI = 5µA
MAX8715 70 260
µS
OSCILLATOR
FREQ = GND
490 770
Frequency f
OSC
FREQ = IN 900 1500
kHz
Maximum Duty Cycle DC FREQ = GND 78 92 %
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX8715EUA+

Mfr. #:
Buy MAX8715EUA+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Low-Noise Step-Up DC/DC Converter
Lifecycle:
New from this manufacturer.
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