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uP6111A 데이터시트 PDF




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부품번호 uP6111A 기능
기능 Single Phase PWM Controller
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uP6111A 데이터시트, 핀배열, 회로
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




uP6111A pdf, 반도체, 판매, 대치품
uP6111A/B
Functional Block Diagram
uP6111B
VCC
VOUT TON
PVCC
Soft
Start
POR &
Reference
0.75V VREF
FB
EN/PSM
1.0V
PHASE
On Time
Calculation
1 Shot
Min Off Time
Diode
Emulator
UCP
Gate
Control
Logic
PVCC
BOOT
UGATE
PHASE
LGATE
PGND
IMAX
AGND
10uA
OCP
115%VREF
OVP
90%VREF
POK
70%VREF
Fault Logic
UVP
POK
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6111A/B-DS-F0101
4

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uP6111A 전자부품, 판매, 대치품
uP6111A/B
Functional Description
900
800
700
600
500
400
300
200
100
0
300 500 700 900 1100 1300 1500
RTON to VIN (kohm)
Figure 1. Switching Frequency vs. RTON. (uP6111A)
700
600
500
400
300
200
100
0
100
200 300 400
RTON to VIN (kohm)
500
600
Figure 2. Switching Frequency vs. RTON. (uP6111B)
Power Saving Mode Operation
The uP6111A/B automatically reduces switching frequency
at light load to maintain high efficiency when PSM is
selected by connecting EN/PSM to VCC. The frequency
reduction is achieved smoothly and without increasing VOUT
ripple or load regulation.
As the output current decreases from heavy load condition,
the inductor current also decreases and eventually comes
to the point that its valley touches zero current at the
boundary between continuous and discontinuous
conduction modes. The uP6111A/B emulates conventional
asynchronous buck converter by turning off the lower
MOSFET when zero inductor current is detected. As the
load current decreased, the converter runs in discontinuous
conduction mode and it takes a long time to discharge the
output capacitor to next ON cycle.
High/Low Side Gate Drivers
The lower gate driver is designed to work with high-current
and low RDS(ON) N-channel MOSFETs. The lower gate driver
is powered by PVCC pin. The driving capability is
represented by its internal resistance, that is 1.5for
sourcing and 1.0for sinking. A dead time to prevent shoot
through is internally generated between upper MOSFET off
to lower MOSFET on and lower MOSFET off to upper
MOSFET on.
The upper gate driver is designed to work with high-current
and low RDS(ON) N-channel MOSFETs. The upper gate driver
work with bootstrap circuit formed by BOOT and PHASE
pins. The bootstrap diode is integrated to simplified circuit
and PCB design. An external Schottky diode can be used if
the forward drop voltage is critical to achieve best efficiency.
The driving capability is represented by its internal
resistance, that is 3.0for sourcing and 1.0for sinking.
Output Discharge Control (Soft Stop)
The uP6111A/B features the soft stop function that
discharges the output when the converter is disabled or in
a fault condition (UVP, OVP, UVLO or thermal shutdown.)
The discharge path is through VOUT, internal 20MOSFET
and PGND pins. The discharge time constant is a function
of the output capacitance and resistance of the discharge
MOSFET.
Over Current Protection (uP6111A)
The uP6111A features cycle-by-cycle current limit function.
The uP6111A monitors the inductor current by lower
MOSFET RDS(ON) when it turns on as shown in Figure 3.
The uP6111A sources a 20uA current source out of IMAX
pin and creates a voltage as:
VIMAX = RIMAX × 20uA + VPHASE
The high side MOSFET will not turn on if the VIMAX voltage
is lower than zero even the voltage loop demands the it to
be turned on. The current limit level is calculated as:
ILIM
=
RIMAX × 20uA
RDS(ON)
+
IRIPPLE
2
where RDS(ON) is the on resistance of lower MOSFET and
IRIPPLE is the inductor current ripple.
The output voltage decreases and eventually triggers the
under voltage protection if the load continuously demands
current larger than the current limit level.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6111A/B-DS-F0101
7

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