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PDF TD8588 Data sheet ( Hoja de datos )
| Número de pieza | TD8588 | |
| Descripción | 1.2MHz Synchronous Boost Converter | |
| Fabricantes | Techcode | |
| Logotipo |  |
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T echcode®
5V 6A 1.2MHz Synchronous Boost Converter
DATASHEET
TD8588
General Description
Features
The TD8588 is a synchronous rectifier, fixed switching
frequency (1.2MHz typical), and current‐mode step‐up
regulator. The device allows use of small inductors and
output capacitors for USB devices. The current‐mode control
scheme provides fast transient response and good output
voltage accuracy.
At light loads, the TD8588 will automatically enter in Pulse
Frequency Modulation (PFM) operation to reduce the
dominant switching losses. During PFM operation,the IC
consumes very low quiescent current and maintains high
efficiency over the complete load range.The TD8588 also
includes current‐limit and overtemperature shutdown to
prevent damage in the event of an output overload.
The TD8588 is available in ESOP‐8 packages.
92%EffiicencySynchronousBoostConverter With
1000‐mA Output Current From 1.8V Input
Stable with Low ESR Output Capacitors
Fixed 1.2MHz Oscillator Frequency
Low EMI Converter (Integrated Anti‐Ringing Function)
Low Battery Output
Integrated Power SaveModeOperation to Improve Light
Load Efficiency
On load startup
Automatic restart after protection
Load Disconnected During Shutdown
Output Current‐Limit Protection
Over Temperature Protection
Under Voltage Protection
Enable/ShutdownFunction
Available in ESOP‐8 Packages
Lead Free and Green Devices Available(RoHS Compliant)
Applications
Power Bank
Tablet
Portable Equiment
Pin Configurations
October, 20, 2011. Techcode Semiconductor Limited www.techcodesemi.com
1
1 page  
T echcode®
5V 6A 1.2MHz Synchronous Boost Converter
DATASHEET
TD8588
Electrical Characteristics
Unless otherwise specified, these specifications apply over VBAT=3.3V, VOUT=5V and TA= 25 oC.
Symbol
Parameter
Test Conditions
Converter Supply Voltage
VBAT
Range
VOUT
Converter Output and IC
Supply Voltage
No Switching Quiescent
IDD1
Current
Measured from VOUT, VFB=0.6V, VOUT=3.3V
IVBAT
VBAT Quiescent Current
Measured from VBAT, VBAT=3.3V, EN=H
IVBAT-SD
VBAT Quiescent Current
VEN=GND, VBAT=3.3V (Isolate VBAT & VOUT)
VUVLO
VBAT Under Voltage Lockout
Threshold
VREF
Regulated Feedback Voltage
IFB FB Input Leakage Current
Over Temperature Protection
Hysteresis(note 4)
TJ Falling
FOSC
Switching Frequency
FB=GND
RN-FET
N-FET Switch On Resistance VOUT=5V
RP-FET
P-FET Switch On Resistance VOUT=5V
N-FET Current Limit
VOUT=5V
Dead-time (note 4)
VOUT=3.3V~5V
DMAX
SW Maximum Duty Cycle
PFM Current Limit
EN Input Low Threshold
EN EN Input High Threshold
Internal Pull Low
PSI Input Low Threshold
PSI
PSI Input High Threshold
IEN EN Input Leakage Current VEN=1.5V
IPSI
PSI Input Leakage Current
VPSI=1.5V
VZC P-FET Zero Current Detect
VFB Under Voltage Protection
UVP Debounce
(Option)
TOTP
Over Temperature Protection
(note 4)
TJ Rising
Over Temperature Protection
Hysteresis(note 4)
Note 4: Guaranteed by design, not production tested.
TJ Falling
Min
1.8
3.0
-
-
-
1.6
490
-100
-
900
-
-
6
-
85
-
-
1
-
-
1
-
-
-
70
-
-
-
Typ
-
-
40
0.5
0.1
1.7
500
-
30
1200
55
55
-
10
95
700
-
-
500
-
-
3
0.4
+100
75
2
150
30
Max
5.5
Unit
V
5.5 V
60
1
1
1.8
510
100
-
1500
-
-
-
-
-
-
0.4
-
-
0.4
-
5
1
-
80
-
-
uA
uA
uA
V
mV
nA
OC
MHz
m
m
A
ns
%
mA
V
V
k
V
V
uA
uA
mA
%VREF
us
OC
- OC
October, 20, 2011. Techcode Semiconductor Limited www.techcodesemi.com
5
5 Page 
T echcode®
5V 6A 1.2MHz Synchronous Boost Converter
DATASHEET
TD8588
Function Description
Main Control Loop
external component. Conversion efficiency can be as high as
The TD8588 is a constant frequency, synchronous rectifier, 92%.
and current‐mode switching regulator. In normal operation, Load Disconnect
the internal N‐channel power MOSFET is turned on each Driving EN to ground places the TD8588 in shutdown mode.
cycle when the oscillator sets an internal RS latch and turned When in shutdown, the internal power MOSFET turns off, all
off when an internal comparator (ICMP) resets the latch. The internal circuitry shuts down and the quiescent supply
peak inductor current which ICMP resets the RS latch is current reduces to 1A maximum.
controlled by the voltage on the COMP node, which is the A special circuit is applied to disconnect the load from the
output of the error amplifier (EAMP). An external resistive input during shutdown the converter. In conventional
divider connected between VOUT and ground allows the EAMP synchronous rectifier circuits, the back‐gate diode of the
to receive an output feedback voltage VFB at FB pin. When the highside P‐FET is forward biased in shutdown and allows
load current increases, it causes a slightly decrease in VFB current flowing from the battery to the output. However, this
relative to the 0.5V reference, which in turn causes the device uses a special circuit, which takes the cathode of the
COMP voltage to increase until the average inductor current back‐gate diode of the high‐side P‐FET and disconnects it
matches the new load current.
from the source when the regulator is shutdown. The benefit
Start‐up
of this feature for the system design engineer is that the
A start‐up oscillator circuit is integrated in the TD8588. When battery is not depleted during shutdown of the converter. No
the device enables, the circuit pumps the output voltage additional components must be added to the design to make
high. Once the output voltage reaches 1.6V (typ), the main sure that the battery is disconnected from the output of the
DC‐DC circuitry turns on and boosts the output voltage to the converter.
final regulation voltage.
Current‐Limit Protection
Automatic PFM/PWM mode Switch
The TD8588 monitors the inductor current, flowing through
The TD8588 is a fixed frequency PWM peak current
the N‐FET, and limits the current peak at currentlimit level to
modulation control step‐up converter. At light loads, the
prevent loads and the TD8588 from damages during overload
TD8588 will automatically enter in pulse frequency
conditions.
modulation operation to reduce the dominant switching
Over‐Temperature Protection (OTP)
losses. In PFM operation, the inductor current may reach
The over‐temperature circuit limits the junction temperature
zero or reverse on each pulse. A zero current comparator
of the TD8588. When the junction temperature exceeds
turns off the P‐channel synchronous MOSFET, forcing
150oC, a thermal sensor turns off the both N‐FET and P‐FET,
DCM(Discontinuous Current Mode) operation at light load. allowing the devices to cool. The thermal sensor allows the
These controls get very low quiescent current, help to
converters to start a soft‐start process and regulate the
maintain high efficiency over the complete load range.
output voltage again after the junction temperature cools by
Synchronous Rectification
30oC. The OTP is designed with a 30oC hysteresis to lower the
The internal synchronous rectifier eliminates the need for an average Junction Temperature (TJ) during continuous thermal
external Schottky diode, thus reducing cost and board space. overload conditions, increasing the lifetime of the device.
During the cycle off‐time, the P‐FET turns on and shunts the
October, 20, 2011. Techcode Semiconductor Limited www.techcodesemi.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TD8588.PDF ] | |
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