ETA1096
1MHz High Current High Efficiency Synchronous Step-Up
Converter in ESOP8
DESCRIPTION
FEATURES
ETA1096 is an ETA Solutions’ high efficiency, high
frequency synchronous Step-Up converter, capable of
delivering output current up to 3A at a 5V output from
a 3.6V input. With a low Rdson Power MOS and a
built-in synchronous rectifier, its efficiency can be as
high as 93% at a 5V/2.1A load. This greatly minimizes
power dissipation and reduces heat on the IC, making
it ideal for applications that require small board space
and have stringent temperature constraints, such as
power banks and mobile devices. ETA1096 also
incorporates ETA Solutions’ True-Shutoff○R technology
that protects against overload and short-circuit
conditions. With 1MHz switching frequency, small
external input and output capacitors and inductor can
be used.
All of these features are integrated in an economic
ESOP8 package, and peripheral component count is
minimal.
Up to 97% Energy Converting Efficiency
Up to 3A output current at 5V output, 3.6V
input
Externally adjustable output voltage
True Shut off during shutdown and output
short-circuit protection
Thermal Shutdown
ESOP8 package
APPLICATIONS
3G/4G PCI-e module
Power Bank
Mobile 3G/4G Mi-Fi
TYPICAL APPLICATION
ORDERING INFORMATION
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1
PART No.
PACKAGE
TOP MARK
Pcs/Reel
ETA1096E8A
ESOP8
ETA1096
YWW2L
4000
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ETA1096
PIN CONFIGURATION
ABSOLUTEMAXIMUM RATINGS
(Note: Exceeding these limits may damage the device. Exposure to absolute
maximum rating conditions for long periods may affect device reliability.)
ESOP8
All Pins Voltage................................................–0.3V to 5.5V
Operating Temperature Range ………….....…–40° C to 85°
Storage Temperature Range ……………….–55° C to 150° C
Thermal Resistance
θJC
θJA
ESOP8…...………………10….…….50 ……..........° C/W
Lead Temperature (Soldering, 10ssec) …………...….260° C
ESD HBM (Human Body Mode) …………….……………2KV
ESD MM (Machine Mode) ……………………..………..200V
ELECTRICAL CHACRACTERISTICS
(VIN =3.3V, VOUT=3.8V, AGND=PGND, unless otherwise specified. Typical values are at TA = 25° C.)
PARAMETER
Quiescent Current
Shutdown Supply Current at VIN
VIN UVLO Voltage, VUVLO
VIN UVLO hysteresis
Feedback Voltage
FB Leakage Current
Output Over Voltage Protection
NMOS Switch On Resistance
PMOS Switch On Resistance
SW Leakage Current
Start-up Current Limit
Switching Frequency
Short Circuit Hiccup time
Inductor Peak Current Limit
EN Input Current
EN logic high voltage
EN logic low voltage
Thermal Shutdown
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CONDITIONS
EN=IN, No load, Not switching
VEN =GND
MIN
VOUT =2.1 to 5V
0.588
Hysteresis=500mV
VOUT=5V,VSW=0 or 5V, VEN=GND
0.7
ON
OFF
RISET=51kΩ
RISET=30kΩ
VEN=3V
2.5
1.6
Rising, Hysteresis=20° C
2
TYP MAX UNITS
50
80
μA
0.5
5
μA
1.8
V
0.3
V
0.6 0.612
V
0
nA
6
V
40
mΩ
55
mΩ
10
μA
2.5
A
1
1.3
MHz
3.75
ms
75
ms
3.5
4.5
A
6
A
1.5
μA
V
0.6
V
150
°C
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ETA1096
PIN DESCRIPTION
PIN #
1, 8
NAME
GP
2
EN
3
SW
4
IN
5
FB
6
ISET
7
OUT
9
AGND
DESCRIPTION
Power ground pin.
Enable pin for the IC. Drive this pin high to enable the IC, low or floating to
disable.
Switching node of the Switching Regulator. Connect a 1uH to 2.2μH inductor
between IN and SW pin.
Input pin. Bypass IN to GND with a 10uF or greater ceramic capacitor.
Feedback Input. Connect an external resistor divider from the output to FB
and GND to set VOUT, with the equation: Vout = 0.6 x (Ru+Rd)/Rd
Programmable peak-current-limit control. Connect an external resistor
(Riset) between ISET and AGND to set the peak NMOS current-limit
threshold. The current-limit threshold may be adjusted from 0.6A to 5.0A,
And if follows following equation:
Ipeak=(180/Riset)*1000 (A)
Output pin. Bypass with a 22μF or larger ceramic capacitor closely between
this pin and ground.
Analog ground pin. AGND is internally connected to the analog ground of the
control circuitry.
TYPICAL CHARACTERISTICS
(Typical values are at TA = 25oC unless otherwise specified.)
Efficiency Vs. Iout
100%
5
90%
4
80%
3
Efficiency (V)
Vout (V)
Vout Vs. Iout
6
Vin=2V
Vin=2.7V
2
Vin=2V
Vin=2.7V
60%
Vin=3.3V
Vin=3.6V
1
70%
Vin=3.3V
Vin=3.6V
50%
0
0
0.5
1
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1.5
Iout (A)
2
2.5
3
3
Vout=5V
Vin=4.2V
Vin=4.2V
40%
0
0.5
1
1.5
Iout (A)
2
2.5
3
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ETA1096
APPLICATION INFORMATION
Loop Operation
The ETA1096 is a wide input range, high-efficiency, DC/DC step up switching regulator, integrated with a
40mΩ Low Side Main MOSFET and 55mΩ synchronous MOSFET. It uses a PWM current-mode control
scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The
output of the integrator is then compared to the sum of a current-sense signal and the slope compensation
ramp. This operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to
achieve regulation for output voltage.
The output voltage is adjustable by external resistor. The peak current of the NMOS switch is also sensed
to limit the maximum current flowing through the switch and the inductor. The maximum peak current limit is
set to 6A and can be tuned by external resistor. An internal temperature sensor prevents the device from
getting overheated in case of excessive power dissipation.
Light Load Operation
Traditionally, a fixed constant frequency PWM DC/DC regulator always switches even when the output load
is small. When energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite
RDSONs of the MOSFETs and parasitic capacitances. At light load, this loss is prominent and efficiency is
therefore very low. ETA1096 employs a proprietary control scheme that improves efficiency in this situation
by enabling the device into a power saving mode during light load, thereby extending the range of high
efficiency operation.
Short-Circuit Protection
Unlike most step-up converters, the ETA1096 allows for short circuits on the output. In the event of a short
circuit, the device first turns off the NMOS when the sensed current reaches the current limit. After VOUT drops
below VIN the device then enters a linear charge period with the current limited same as with the start-up
period. In addition, the thermal shutdown circuits disable switching if the die temperature rises above 150° C.
Down Mode (VIN>VOUT) Operation
The ETA1096 will continue to supply the output voltage even when the input voltage exceeds the output
voltage. Since the PMOS no longer acts as a low-impedance switch in this mode, power dissipation
increases within the IC to cause a sharp drop in efficiency. Limit the maximum output current to maintain an
acceptable junction temperature.
Output Voltage Setting
The ETA1096 has an internal reference voltage set at 0.6V as a feedback voltage for setting external
output voltage. By connecting a resistor (R1) between Vout and FB, and a resistor (R2) between FB and
GND, one can set the output voltage by following equation, and please make sure the output voltage is set
higher than the maximum input voltage
Vout = 0.6 x (R1+R2)/R2
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ETA1096
Switching Peak Current Limit Setting
The ETA1096 allows one to set the switching peak current by external resistor (Riset). The switching peak
current limit is more like an input current limit given a fixed inductor value. If one needs an output current limit,
both input voltage, output voltage, and efficiency have to be taken into account to calculate the input current.
The switching peak current setting follows the equation: Ipeak=(180/Riset)*1000 (A)
Output Current Limit Setting
As mentioned above, inductor current peak limit just keeps input current constant, the output current limit of
the Boost system increases with the input voltage at given output voltage. But in some circumstances, a
constant output current limit is more favorable. And then, connecting R1 between IN and ISET pin may help
the output current constant, because when input voltage increases, a current from IN to ISET pin through
R1 will compensate part of current that flow out of ISET pins, which is the current source to determine the
inductor current peak. In shorts, with the existence of R1, inductor current limit will decrease when input
voltage increases and thus keep the output current limit less sensitive to input voltage, and almost a
constant current limit can be achieved by carefully selecting the value of R1 and Riset.
In the application circuit shown below, one can find the R1 which is indicated as “optional”, and only needed
for setting output current limit irrelative to input voltage.
By setting R1 160Kohm and Riset 24Kohm, an almost constant current limit (2.2A) is achieved with input voltage from 3.0V
to 4.2V, which is shown by following charts. The output current limit is measured by forcing output voltage at 4.75V while
the ETA1096 is set to have normal output voltage at 5V.
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ETA1096
Output Current Limit Vs. Input Voltage
Output Current Limit (A)
2.5
2
1.5
1
0.5
0
3
3.2
3.4
3.6
3.8
4
4.2
Input Voltage (V)
Please contact ETA engineers and let them know the desired constant output current limit, R1 and Riset will be soon
calculated for customers.
THERMAL CONSIDERATIONS
As the ETA1096 has a power MOSFET with internal current limit up to 6A, heat dissipation is always needed
to be considered when designing the PCB for such high-power step-up converter. ETA1096 employs a
package of ESOP8 with only 10OC/W thermal resistance from chip to its thermal pad. So it is crucial for one
to lay a large area of copper (in most case, it is the large ground plane), directly contacting the thermal pad
of the chip through more than 2 large vias from bottom, to spread the heat away to the ambient environment
as fast as possible.
A thicker copper foil is always recommended to help the heat dissipation, so a PCB with 2oz copper thickness
is a much better choice than that of 1oz copper.
BLOCK DIAGRAM
EN
VIN
OUT
UVLO &
Thermal
shutdown
REF
+
EA
+
-
Σ
-
FB
PWM
Logic
OSC
SW
DRIVER
Current Limit
Slope Comp
GA
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ISET
6
GP
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ETA1096
PCB GUIDELINES
A typical ETA1096 demo board is shown below. Because the ETA1096 has Vout pins on opposite sides of
the chip, please always place 2 output capacitors (CO1, and C02) closest to the Vout pins (pin7) and GP
(pin8 and pin1). As one can see on the demo board,
There are many peripheral devices is not necessary for real application, such as Csw, FB (ferrite-bead), and
many small capacitors along the power trace. These are the options for fine-tuning the EMI characteristics of
the demo board.
To place the 2 output
capacitors just next to
ETA1096, with shortest
path to OUT and GP pins
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CO1
Please DONOT connect
AGND and PGND here,
to avoid PGND noise
affecting the clean analog
ground.
7
CO2
Inductor
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ETA1096
PACKAGE OUTLINE
Package: ESOP8
RECOMMENDED LAND PATTERN
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ETA1096
TAPE AND REEL INFORMATION
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