NCP81151B
VR12.5 Compatible
Synchronous Buck MOSFET
Driver
The NCP81151B is a high performance dual MOSFET gate driver
optimized to drive the gates of both high−side and low−side power
MOSFETs in a synchronous buck converter. It can drive up to 3 nF
load with a 25 ns propagation delay and 20 ns transition time.
Adaptive anti−cross−conduction and power saving operation circuit
can provide a low switching loss and high efficiency solution for
notebook systems.
The UVLO function guarantees the outputs are low when the supply
voltage is low.
Features
•
•
•
•
•
•
•
•
•
Faster Rise and Fall Times
Adaptive Anti−Cross−Conduction Circuit
Zero Cross Detection function
Output Disable Control Turns Off Both MOSFETs
Undervoltage Lockout
Power Saving Operation Under Light Load Conditions
Direct Interface to NCP6131 and Other Compatible PWM
Controllers
Thermally Enhanced Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
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MARKING
DIAGRAM
1
1
CPMG
G
DFN8
CASE 506AA
CP = Specific Device Code
M = Date Code
G
= Pb−Free Package
(Note: Microdot may be in either location)
PINOUT DIAGRAM
8
DRVH
7
SW
3
6
GND
4
5
DRVL
BST
1
PWM
2
EN
VCC
FLAG
9
Typical Applications
• Power Management Solutions for Notebook Systems
ORDERING INFORMATION
Device
Package
Shipping†
NCP81151BMNTBG
DFN8
(Pb−Free)
3000 / Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
December, 2015 − Rev. 0
1
Publication Order Number:
NCP81151B/D
NCP81151B
BST
VCC
DRVH
PWM
Logic
SW
Anti−Cross
Conduction
VCC
DRVL
EN
ZCD
Detection
UVLO
Figure 1. Block Diagram
PIN DESCRIPTIONS
Pin No.
Symbol
Description
1
BST
Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin and
the SW pin.
2
PWM
Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode
Emulation Enabled, High = High Side FET Enabled.
3
EN
Logic input. A logic high to enable the part and a logic low to disable the part. Three states logic input:
EN = High to enable the gate driver;
EN = Low to disable the driver;
EN = Mid to go into diode mode (both high and low side gate drive signals are low)
4
VCC
Power supply input. Connect a bypass capacitor (0.1 mF) from this pin to ground.
5
DRVL
Low side gate drive output. Connect to the gate of low side MOSFET.
6
GND
Bias and reference ground. All signals are referenced to this node.
7
SW
8
DRVH
High side gate drive output. Connect to the gate of high side MOSFET.
9
FLAG
Thermal flag. There is no electrical connection to the IC. Connect to ground plane.
Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET.
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2
NCP81151B
APPLICATION CIRCUIT
VIN
5V_POWER
TP1
R1
1.02
R164
BST
HG
PWM SW
PWM
DRON
EN
GND
VCC
Q1
NTMFS4821N
0.027uF
TP2
0.0
NCP81151B
TP3
R143
0.0
TP4
C4
LG
C2
4.7uF
C3
4.7uF
+
CE9
390uF
R142
0.0
VREG_SW1_HG
TP5
L
VREG_SW1_OUT
VCCP
235nH
TP6
TP7
VREG_SW1_LG
Q9
NTMFS4851N
Q10
NTMFS4851N
R3
2.2
JP13_ETCH CSN11
PAD
C5
1uF
C1
4.7uF
TP8
C6
2700pF
JP14_ETCH CSP11
Figure 2. Application Circuit
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3
NCP81151B
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL INFORMATION
Symbol
Pin Name
VMAX
VMIN
VCC
Main Supply Voltage Input
6.5 V
−0.3 V
BST
Bootstrap Supply Voltage
35 V wrt/ GND
40 V v 50 ns wrt/ GND
6.5 V wrt/ SW
7.7 V < 50 ns wrt/ SW
−0.3 V wrt/SW
SW
Switching Node (Bootstrap Supply Return)
35 V
40 V v 50 ns
−5 V
−10 V (200 ns)
DRVH
High Side Driver Output
BST + 0.3 V
−0.3 V wrt/SW
−2 V (< 200 ns) wrt/SW
DRVL
Low Side Driver Output
VCC + 0.3 V
−0.3 V DC
−5 V (< 200 ns)
PWM
DRVH and DRVL Control Input
6.5 V
−0.3 V
Enable Pin
6.5 V
−0.3 V
0V
0V
EN
GND
Ground
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
*All signals referenced to AGND unless noted otherwise.
THERMAL INFORMATION
Symbol
RqJA
Parameter
Thermal Characteristic QFN Package (Note 1)
Value
Unit
119
°C/W
TJ
Operating Junction Temperature Range (Note 2)
−40 to 150
°C
TA
Operating Ambient Temperature Range
−40 to +100
°C
TSTG
Maximum Storage Temperature Range
−55 to +150
°C
MSL
Moisture Sensitivity Level − QFN Package
1
*The maximum package power dissipation must be observed.
1. 1 in2 Cu, 1 oz. thickness.
2. JESD 51−7 (1S2P Direct−Attach Method) with 1 LFM.
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4
NCP81151B
NCP81151B ELECTRICAL CHARACTERISTICS (−40°C < TA < +100°C; 4.5 V < VCC < 5.5 V, 4.5 V < BST−SWN < 5.5 V,
4.5 V < BST < 30 V, 0 V < SWN < 21 V, unless otherwise noted)
Parameter
Test Conditions
Min
Typ
Max
Unit
5.5
V
SUPPLY VOLTAGE
4.5
VCC Operation Voltage
UNDERVOLTAGE LOCKOUT
VCC Start Threshold
3.8
4.35
4.5
V
VCC UVLO Hysteresis
150
200
250
mV
20
mA
SUPPLY CURRENT
Shutdown Mode
ICC + IBST, EN = GND
11
Normal Mode
ICC + IBST, EN = 5 V, PWM = OSC
4.7
mA
Standby Current
ICC + IBST, EN = HIGH, PWM = LOW,
No loading on DRVH & DRVL
0.9
mA
Standby Current
ICC + IBST, EN = HIGH, PWM = HIGH,
No loading on DRVH & DRVL
1.1
mA
BOOTSTRAP DIODE
Forward Voltage
VCC = 5 V, forward bias current = 2 mA
0.1
0.4
0.6
V
PWM INPUT
PWM Input High
3.4
PWM Mid−State
1.3
V
2.7
PWM Input Low
0.7
ZCD Blanking Timer
350
V
V
ns
HIGH SIDE DRIVER
Output Impedance, Sourcing Current
VBST−VSW = 5 V
0.9
1.7
W
Output Impedance, Sinking Current
VBST−VSW = 5 V
0.7
1.7
W
DRVH Rise Time trDRVH
VCC = 5 V, 3 nF load, VBST−VSW = 5 V
16
25
ns
DRVH Fall Time tfDRVH
VCC = 5 V, 3 nF load, VBST−VSW =5 V
11
18
ns
DRVH Turn−Off Propagation Delay tpdlDRVH
CLOAD = 3 nF
10
30
ns
DRVH Turn−On Propagation Delay tpdhDRVH
CLOAD = 3 nF
10
40
ns
SW Pulldown Resistance
SW to PGND
45
kW
DRVH Pulldown Resistance
DRVH to SW, BST−SW = 0 V
45
kW
LOW SIDE DRIVER
W
Output Impedance, Sourcing Current
0.9
1.7
Output Impedance, Sinking Current
0.4
0.8
W
DRVL Rise Time trDRVL
CLOAD = 3 nF
16
25
ns
DRVL Fall Time tfDRVL
CLOAD = 3 nF
11
15
ns
DRVL Turn−Off Propagation Delay tpdlDRVL
CLOAD = 3 nF
10
30
ns
DRVL Turn−On Propagation Delay tpdhDRVL
CLOAD = 3 nF
5.0
25
ns
DRVL Pulldown Resistance
DRVL to PGND, VCC = PGND
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5
45
kW
NCP81151B
NCP81151B ELECTRICAL CHARACTERISTICS (−40°C < TA < +100°C; 4.5 V < VCC < 5.5 V, 4.5 V < BST−SWN < 5.5 V,
4.5 V < BST < 30 V, 0 V < SWN < 21 V, unless otherwise noted)
Parameter
Test Conditions
Min
Typ
Max
Unit
EN INPUT
Input Voltage High
3.3
Input Voltage Mid
1.35
V
1.8
Input Voltage Low
Input bias current
−1.0
Propagation Delay Time
20
V
0.6
V
1.0
mA
40
ns
20
mA
SW NODE
SW Node Leakage Current
Zero Cross Detection Threshold Voltage
−6.0
mV
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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6
NCP81151B
Table 1. DECODER TRUTH TABLE
ZCD
DRVL
DRVH
PWM High (Enable High)
Input
ZCD Reset
Low
High
PWM Mid (Enable High)
Positive Current Through the Inductor
High
Low
PWM Mid (Enable High)
Zero Current Through the Inductor
Low
Low
PWM Low (Enable High)
ZCD Reset
High
Low
X
Low
Low
Enable at Mid
1V
1V
Figure 3.
PWM
DRVH−SW
DRVL
IL
Figure 4. Timing Diagram
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7
NCP81151B
APPLICATION INFORMATION
high after the tpdhDRVH delay. When PWM is set low, the
driver will monitor the gate voltage of the high side
MOSFET. When the DRVH−SWN voltage falls below the
top gate drive threshold, DRVL will be set to high after the
tpdhDRVL delay.
The NCP81151B gate driver is a single phase MOSFET
driver designed for driving N−channel MOSFETs in a
synchronous buck converter topology. The NCP81151B is
designed to work with ON Semiconductor’s NCP6131
multi−phase controller. This gate driver is optimized for
notebook applications.
Layout Guidelines
The layout for a DC−DC converter is very important. The
bootstrap and VCC bypass capacitors should be placed close
to the driver IC.
Connect the GND pin to a local ground plane. The ground
plane can provide a good return path for gate drives and
reduce the ground noise. The thermal slug should be tied to
the ground plane for good heat dissipation. To minimize the
ground loop for the low side MOSFET, the driver GND pin
should be close to the low−side MOSFET source pin. The
gate drive trace should be routed to minimize its length. The
minimum width is 20 mils.
Undervoltage Lockout
DRVH and DRVL are held low until VCC reaches 4.5 V
during startup. The PWM signal will control the gate status
when VCC threshold is exceeded.
Three−State EN Signal
When EN is set to the mid state, both DRVH and DRVL
are set low, to force diode mode operation.
PWM Input and Zero Cross Detect (ZCD)
The PWM input, along with EN and ZCD, control the state
of DRVH and DRVL.
When PWM is set high, DRVH will be set high after the
adaptive non−overlap delay. When PWM is set low, DRVL
will be set high after the adaptive non−overlap delay.
When PWM is set to the mid state, DRVH will be set low,
and after the adaptive non−overlap delay, DRVL will be set
high. DRVL remains high during the ZCD blanking time.
When the timer has expired, the SW pin will be monitored
for zero cross detection. After the detection, DRVL will be
set low.
Gate Driver Power Loss Calculation
The gate driver power loss consists of the gate drive loss
and quiescent power loss.
The equation below can be used to calculate the power
dissipation of the gate driver. QGMF is the total gate charge
for each main MOSFET and QGSF is the total gate charge for
each synchronous MOSFET.
P DRV +
ƪ
Adaptive Non−overlap
Adaptive dead time control is used to avoid shoot−through
damage of the power MOSFETs. When the PWM signal
pulls high, DRVL will be set low and the driver will monitor
the gate voltage of the low side MOSFET. When the DRVL
voltage falls below the gate threshold, DRVH will be set to
f SW
2
n
ǒn MF
Q GMF ) n SF
ƫ
Q GSFǓ ) I CC
V CC
(eq. 1)
Also shown is the standby dissipation factor (ICC x VCC)
of the driver.
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8
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
DFN8 2x2, 0.5P
CASE 506AA−01
ISSUE E
DATE 22 JAN 2010
1
SCALE 4:1
D
PIN ONE
REFERENCE
2X
0.10 C
2X
A
B
ÇÇ
ÇÇ
ÇÇ
0.10 C
L1
DETAIL A
E
OPTIONAL
CONSTRUCTIONS
DIM
A
A1
A3
b
D
D2
E
E2
e
K
L
L1
ÉÉ
ÉÉ
EXPOSED Cu
TOP VIEW
A
DETAIL B
0.10 C
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994 .
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.15 AND 0.20 MM FROM TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
L
L
MOLD CMPD
DETAIL B
OPTIONAL
CONSTRUCTION
0.08 C
(A3)
NOTE 4
SIDE VIEW
A1
C
SEATING
PLANE
GENERIC
MARKING DIAGRAM*
1
DETAIL A
D2
1
8X
4
L
8
5
e/2
e
8X
XXMG
G
XX = Specific Device Code
M = Date Code
G
= Pb−Free Device
E2
K
MILLIMETERS
MIN
MAX
0.80
1.00
0.00
0.05
0.20 REF
0.20
0.30
2.00 BSC
1.10
1.30
2.00 BSC
0.70
0.90
0.50 BSC
0.30 REF
0.25
0.35
−−−
0.10
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “ G”,
may or may not be present.
b
0.10 C A B
0.05 C
NOTE 3
RECOMMENDED
SOLDERING FOOTPRINT*
BOTTOM VIEW
1.30
PACKAGE
OUTLINE
0.90
8X
0.50
2.30
1
8X
0.30
0.50
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
DOCUMENT NUMBER:
DESCRIPTION:
98AON18658D
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
DFN8, 2.0X2.0, 0.5MM PITCH
PAGE 1 OF 1
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