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PDF uP6111B Data sheet ( Hoja de datos )
| Número de pieza | uP6111B | |
| Descripción | Single Phase PWM Controller | |
| Fabricantes | uPI Semiconductor | |
| Logotipo |  |
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uP6111A/B
Single Phase PWM Controller
for Mobile Applications
General Description
Features
The uP6111A/B is a high performance synchronous-rectified
buck controller specifically designed for POL voltage
regulation in notebook PC application. The controller
operates with 5V bias voltage and converts 2V~26V input
voltage to 0.75V~5.5V output voltage.
The uP6111A/B adopts constant-on-time PWM scheme
that features easy-to-use, low external component count,
fast transient response and quasi constant frequency
operation over the operation range. Selectable Forced
Continuous Conduction Mode (FCCM) or Power Saving
Mode (PSM) enables the flexibility for low noise operation
or high efficiency conversion over wide output current range.
Lossless current sensing by RDS(ON) of lower switch
achieves programmable over current protection. Other
features include internal soft start, integrated bootstrap diode
and thermal shutdown. The uP6111A is available in
WQFN3x3 -16L and WQFN4x4-16L packages. The
uP6111B is available in VQFN3.5x3.5- 14L and TSSOP-
14L packages.
Applications
Power Supplies for Microprocessors or
Subsystem Power Supplies
Cable Modems, Set Top Boxes, and DSL
Modems
Industrial Power Supplies; General Purpose
Supplies
2V to 26V Input DC-DC Regulators
Low-Voltage Distributed Power Supplies
Wide Input Voltage Range 2V ~ 26V
Wide Output Voltage Range 0.75V ~ 5.5V
1.0% Initial Accuracy
Constant On Time PWM
Quasi Constant Switching Frequency
Adjustable Frequency from 200kHz to
500kHz
Ultra Fast Transient Response
Integrated Bootstrap Diode
Integrated MOSFET Drivers with Shoot-Through
Protection
Configurable Forced Continuous Current Mode
or Power Saving Mode
Lossless, Programmable Overcurrent Protection
Use Low-Side MOSFET RDS(ON)
Internal Soft Start
Over Voltage and Under Voltage Protection
Power OK Indication
WQFN4x4 - 16L, WQFN3x3 - 16L,
VQFN3.5X3.5 - 14L, or TSSOP - 14L Packages
RoHS Compliant and 100% Lead Free
Ordering Information
Order Number Package Type
uP6111AQED WQFN4x4 - 16L
uP6111AQDD WQFN3x3 - 16L
uP6111BQHC VQFN3.5x3.5 - 14L
uP6111BTAC TSSOP - 14L
Remark
Refer to IMAX and
TON pin description
on P. 5.
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6111A/B-DS-F0101
1
1 page  
uP6111A/B
Functional Pin Description
Pin Name Pin Function
VOUT
Output Voltage Detection. Connect this pin directly to the converter output voltage for output voltage
sensing.
VCC
Supply Voltage for the IC. This pin provides bias voltage for the IC. Connect this pin to 5V voltage
source and bypass it with a R/C filter.
FB
Feedback Voltage for Buck Converter. This pin is the inverting input to the error amplifier. A resistor
divider from the output to GND is used to set the regulation voltage.
POK
Output Voltage OK Indication. This pin is an open drain output for indicating output voltage status. It
is set high impedance when the output voltage is within regulation and no faults occur.
NC Not Internally Connected.
AGND Signal Ground for the IC. All voltages levels are measured with respect to this pin.
PGND
LGATE
PVCC
IMAX
PHASE
UGATE
BOOT
EN/PSM
TON
Exposed
Pad
Power Ground. This pin is dedicated for lower MOSFET driver and should be directly connected to
the source of the lower MOSFET with an isolated path.
Lower Gate Driver Output. Connect this pin to the gate of lower MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to determine when the lower MOSFET has turned off.
Supply Voltage for the Gate Drivers. This pin provides current for lower gate driver and bootstrap
circuit for upper gate driver. Connect this pin to 5V voltage source and bypass it with a R/C filter.
Current Limit Threshold Setting and Sense. Connect a resistor to drain of low-side MOSFET for
RDS(ON) sensing. (uP6111A)
Over Current Protection Level Seting. Connect a resistor from this pin to AGND to set the OCP
level. (uP6111B)
PHASE Switch Node. Connect this pin to the source of the high-side MOSFET and the drain of the
lower MOSFET. This pin is used as the sink for the UGATE driver, and to monitor the voltage drop
across the lower MOSFET for over current protection. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the upper MOSFET has turned off.
Upper Gate Driver Output. Connect this pin to the gate of upper MOSFET. This pin is monitored by
the adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off.
Bootstrap Supply for the floating upper gate driver. Connect the bootstrap capacitor CBOOT between
BOOT pin and the PHASE pin to form a bootstrap circuit. The bootstrap capacitor provides the charge
to turn on the upper MOSFET. Typical values for CBOOT range from 0.1uF to 0.47uF. Ensure that CBOOT is
placed near the IC.
Chip Enable and Mode Selection. Pulling this pin lower than 0.4V disables the IC and turns off both
upper and lower MOSFETs. Tie this pin to VCC for power saving mode (PSM) operation and let this
pin float for force continuous conduction mode (FCCM) operation.
ON Time Programming. Connect a resistor from this pin to VIN (uP6111A) or PHASE (uP6111B) to
set the on-time for the upper MOSFET.
TON = 3.85x 10-12 x RTONx VOUT/(VIN - 0.5) - uP6111A
TON = 19x 10-12 x RTON x {[(2/3)VOUT + 100mV]/VIN} + 50ns - uP6111B
Signal Ground for the IC. All voltages levels are measured with respect to this pin. This exposed pad
should be well soldered to PCB for effective heat conduction.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6111A/B-DS-F0101
5
5 Page 
uP6111A/B
Electrical Characteristics
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Current Sense
IMAX Source Current
uP6111A
IIMAX uP6111B
18 20 22 uA
9 10 11 uA
OCP Comparator Offset
Negative OCP Comparator Offset
Zero Crossing Comparator Offset
Logic and Protection Level
VOC_OFS
VOC_OFS
VZC_OF
for uP6111B only
-10 0 10 mV
-9.5 0.5 10.5 mV
-9.5 0.5 10.5 mV
EN/PSM Logic Low
-- -- 0.7 V
EN/PSM Logic High
2.9 -- -- V
EN/PSM Floating Level
1.6 1.9 2.2 V
EN/PSM Source Current
Power OK Threshold From Lower
Power OK Low Hysteresis
Power OK Threshold Fom Higher
Power OK High Hysteresis
Power OK Sinking Current
Power OK Delay Time
IEN/PSM
IPOK
EN/PSM = GND
VFB rising, percentage of VREF
VFB falling, percentage of VREF
VFB falling, percentage of VREF
VFB rising, percentage of VREF
VPOK = 0.5V.
-- 1 -- uA
87 90 93 %
-- -3 -- %
107 110 113 %
-- 3 -- %
2 -- -- mA
-- 45 -- us
Over Voltage Trip Level
Over Voltage Delay Time
VOVP percentage of VREF
111 115 119
-- 30 --
%
us
Under Voltage Trip Level
Under Voltage Delay Time
VUVP percentage of VREF
65 70 75 %
-- 4 -- us
OTP Temperature Level
OTP Temperature Hysteresis
TOTTH
TOTHYS
-- 150 --
-- 20 --
OC
OC
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.
These are for stress ratings. 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 remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 4. The device is not guaranteed to function outside its operating conditions.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6111A/B-DS-F0101
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet uP6111B.PDF ] | |
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