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PDF MAX17116 Data sheet ( Hoja de datos )
| Número de pieza | MAX17116 | |
| Descripción | Dual-Output DC/DC Power Supply | |
| Fabricantes | Maxim Integrated | |
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19-5653; Rev 0; 12/10
EVAALVUAAILTAIOBNLEKIT
Dual-Output DC/DC
Power Supply for AMOLED
General Description
The MAX17116 includes two current-mode 1.4MHz
switch mode power-supply (SMPS) regulators for active-
matrix organic light-emitting diode (AMOLED) displays.
The positive supply is provided by a step-up regulator
with a synchronous rectifier. The negative supply is
provided by an inverting regulator with a synchronous
rectifier.
The step-up DC-DC converter is a high-accuracy 250mA
regulator with an integrated power MOSFET switch
and synchronous rectifier. The synchronous rectifier
improves efficiency and also provides True ShutdownTM.
Its 4.6V (fixed) output efficiency exceeds 85% at 150mA
from a 3.7V input. A built-in, 7-bit, digital soft-start func-
tion controls startup inrush currents.
The inverting DC-DC converter is a high-accuracy
250mA regulator with a built-in power MOSFET switch
and synchronous rectifier. Its -5.4V to -1.5V output effi-
ciency exceeds 80% at 150mA from a 3.7V input. A built-
in, 7-bit, digital soft-start function controls startup inrush
currents. The internally set output voltage is adjusted
through a unique communication protocol through the
single EN pin.
The IC is available in a 12-pin, 3mm x 3mm x 0.5mm,
ultra-thin DFN package with exposed pad and 0.5mm
lead spacing to facilitate placement on extremely narrow
circuit boards and a 24-pin, 4mm x 4mm, thin QFN pack-
age with exposed pad.
OLED Displays
Phone, DSC Displays
Automobile Navigation
Applications
Features
S 2.3V to 4.2V Input Operating Voltage Range
S High-Performance PWM Step-Up Regulator
Fixed 4.6V, 250mA Output
High Accuracy (±1%)
1.4MHz Switching Frequency
Built-In 6V/0.25I n-Channel MOSFET with
Lossless Current Sensing
Built-In 6V/0.5I p-Channel MOSFET
Synchronous Rectifier
Cycle-by-Cycle Current Limit
More than 85% Efficiency at 150mA
Good Low-Duty Factor Operation
S High-Performance PWM Inverting Regulator
Programmable 250mA Output
High Accuracy (±1%)
Adjustable Controlled-Output-Voltage Slew Rate
1.4MHz Switching Frequency
Built-In 14V/0.25I p-Channel Power MOSFET
with Lossless Current Sensing
Built-In 14V/0.25I n-Channel Power MOSFET
Synchronous Rectifier
Cycle-by-Cycle Current Limit
More than 80% Efficiency at 150mA
S True Shutdown for Both Outputs
S Timer-Delayed Output Undervoltage Shutdown for
Both Outputs
S Thermal-Overload Protection
S 12-Pin, 3mm x 3mm Ultra-Thin DFN Package and
24-Pin, 4mm x 4mm TQFN Package
Ordering Information
PART
MAX17116EVC+
MAX17116ETG+*
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
12 UTDFN**
24 TQFN**
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
**Exposed pad.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Dual-Output DC/DC
Power Supply for AMOLED
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.7V, Circuit of Figure 2, VOUTP = +4.9V, VOUTN = -4.9V, TA = -40°C to +85°C, unless otherwise noted. Typical values are
at TA = +25NC.) (Note 1)
PARAMETER
TIMING SPECIFICATIONS
Enable Start Delay
EN Pulse Stop Time
EN Turn-Off Delay
EN Pulse Frequency
CONDITIONS
tEN_DLY (Note 3)
tSTOP (Note 3)
tOFF_DLY (Note 3)
50% duty factor
MIN TYP MAX UNITS
400 Fs
250 Fs
50 70 Fs
12 250 kHz
Note 1: Limits are 100% production tested at TA = +25NC. Maximum and minimum limits over temperature are guaranteed by design
and characterization.
Note 2: Guaranteed by design, not production tested.
Note 3: The timing definitions are illustrated in Figure 1.
Note 4: The initial start ramp time depends on load conditions and is correct only when the discharge time due to load on the output
capacitance is shorter than ramp time.
tEN_DLY
EN
OUTN
tSTOP
tSH
tSTOP
tSL
tOFF_DLY
tSS tIS
Figure 1. EN Serial Interface Timing Diagram
tTRA
tVO_OFF_DLY
5
5 Page 
Dual-Output DC/DC
Power Supply for AMOLED
Step-Up Regulator
The step-up regulator is a constant-frequency current-
mode type. It operates at a 1.4MHz switching frequency
to allow the use of tiny 0.6mm thin inductors. The IC’s
internal digital soft-start, internal MOSFET switch, and
synchronous rectifier reduce the number of external
components for a very compact application circuit.
The regulator controls the output voltage and the power
delivered to the output by modulating duty cycle D of
the internal power MOSFET in each switching cycle. An
error amplifier compares the feedback signal with an
internal reference voltage and changes its output inter-
nal compensation node with its pole/zero series resistor
and capacitor to set the peak inductor current. As the
load varies, the error amplifier sources or sinks current
to the compensation node accordingly to produce the
inductor peak current necessary to service the load. To
maintain stability at high duty cycles, a slope compensa-
tion signal is added.
On the rising edge of the internal clock, the controller
sets a flip-flop, turning on the n-channel MOSFET and
applying the input voltage across the inductor. The
current through the inductor ramps up linearly, stor-
ing energy in its magnetic field. Once the sum of the
current-feedback signal and the slope compensation
exceed the compensation voltage, the controller resets
the flip-flop, turning off the MOSFET and turning on
the synchronous rectifier. Since the inductor current is
continuous, a transverse potential develops across the
inductor and the inductor sources current to the output.
The voltage across the inductor then becomes the differ-
ence between the output voltage and the input voltage.
This discharge condition forces the current through the
inductor to ramp back down, transferring the energy
stored in the magnetic field to the output capacitor and
the load. The MOSFET remains off for the rest of the
clock cycle.
The converter operates in skip mode only at very light
loads (typically it is less than 4mA) and includes a damp-
ing switch that turns on when the synchronous rectifier
turns off at zero or negative current to control LXP ringing.
Inverting Converter
The inverting converter is also a constant-frequency
(1.4MHz) current-mode type and includes synchro-
nous rectification to lower application of BOM cost and
improve efficiency. The inverter operates in skip mode
only at light loads and includes a damping switch that
turns on when the synchronous rectifier turns off at zero
or negative current. The switch prevents ringing in the
inductor in discontinuous conduction and the resulting
RF noise.
The inverting converter operates similarly to the step-up
converter, except that the main switch is a p-channel
MOSFET between LXN and IN. Energy is stored in the
inductor during the switch on-time and the continuous
inductor current pulls current from the output to ground
when the flip-flop resets, the main switch turns off, and
the synchronous rectifier turns on.
The internally set output voltage for the inverting con-
verter is adjustable between -5.4V and -1.5V in 100mV
steps. Adjustment is accomplished though a unique
control interface using the EN pin as shown in the EN
Serial Interface section. The step rate while program-
ming VOUTN is also adjustable through STEP pin set-
tings shown in the Electrical Characteristics table.
EN Serial Interface
The enable pin (EN) is used as an on/off pin, as well
as a serial interface input. When EN goes high, the IC
starts operation only after a 300Fs delay. Similarly, when
EN falls, the IC enters the shutdown state only after a
60Fs delay. This makes the EN pin available for serial-
data input as long as the pin state keeps changing fast
enough to avoid entering shutdown (12kHz or greater).
The interface protocol is a simple correspondence
between the number of pulses to ground on EN (1 to 40)
and the desired output voltage (-5.4V to -1.5V). Table 3
shows the relationship between the number of pulses
and the desired output voltage for the driver IC.
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX17116.PDF ] | |
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