NCP81166, NCP81166A
Synchronous Buck MOSFET
Drivers
The NCP81166/A 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. 2mm x 2mm DFN8
package allows for space−optimized board layout.
Zero current detect feature allows for a high−efficiency solution
even at light load conditions. Pre−OVP feature aids in protecting the
load in the event of a short across the high−side FET. VCC UVLO
ensures the MOSFETs are off when supply voltages are low. A
bi−directional Enable pin provides a fault signal to the controller
when a pre−OVP or UVLO fault is detected.
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1
DFN8
MN SUFFIX
CASE 506CN
Features
•
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Space−Efficient 2 mm x 2mm DFN8 Thermally−Enhanced Package
VCC Range of 4.5 V to 13.2 V
Integrated Bootstrap Diode
Pre−OVP Function Protects Load during HS FET Short
♦ NCP81166: 2.25 V SW Trip Threshold
♦ NCP81166A: 1.8 V SW Trip Threshold
Zero Current Detect Function Provides Power Saving Operation
during Light Load Conditions
Bi−directional Enable Feature pulls Enable pin low during pre−OVP
and UVLO Faults
5 V tri−state PWM Logic
Adaptive Anti−Cross−Conduction Circuit Protects against
Cross−Conduction during FET turn−on and turn−off
Output Disable Control turns off both MOSFETs via Enable pin
VCC Undervoltage Lockout
Direct interface to ASP1252, ASP1400 and other compatible PWM
Controllers
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
• Power Solutions for Desktop Systems
© Semiconductor Components Industries, LLC, 2015
January, 2015 − Rev. 2
1
MARKING DIAGRAM
1
XXMG
G
XX = Specific Device Code
CE for NCP81166
CH for NCP81166A
M = Date Code
G
= Pb−Free Device
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping†
NCP81166MNTBG
DFN8
(Pb−Free)
3000 / Tape &
Reel
NCP81166AMNTBG
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 Specification
Brochure, BRD8011/D.
Publication Order Number:
NCP81166/D
NCP81166, NCP81166A
PWM
BST
1
NC
DRVH
GND
9
EN
SW
VCC
DRVL
(Top View)
Figure 1. Pin Diagram
BST
VCC
DRVH
PWM
Logic
SW
Anti−Cross
Conduction
VCC
DRVL
EN
Fault
ZCD
Detection
UVLO
Pre−OV
Figure 2. Block Diagram
Table 1. Pin Descriptions
Pin No.
Symbol
Description
1
PWM
Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode Emulation Enabled, High = High Side FET Enabled.
2
NC
No connect. There is no electrical connection from this pin to the die. Externally connecting this pin to ground
will not affect the functionality of the part.
3
EN
Logic input. A logic high to enable the part and a logic low to disable the part. Pin is internally pulled low during pre−OVP and UVLO faults.
4
VCC
Power supply input. Connect a bypass capacitor (1 mF) from this pin to ground.
5
DRVL
Low side gate drive output. Connect to the gate of low side MOSFET.
6
SW
7
DRVH
8
BST
Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin and
the SW pin.
9
GND
Bias and reference ground. All signals are referenced to this node.
Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET.
High side gate drive output. Connect to the gate of high side MOSFET.
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2
NCP81166, NCP81166A
12V_POWER
TP1
R164
R1
1.02
C4
TP2
0.0
R143 NCP81166/A TP3
0.0
TP4
PWM
BST
HG
PWM SW
DRON
EN
LG
C1
4.7uF
C2
4.7uF
+
CE9
390uF
0.0
VREG_SW1_HG
TP5
VCCP
L
VREG_SW1_OUT
235nH
TP6
TP7
Q9
NTMFS4851N
VREG_SW1_LG
Q10
NTMFS4851N
R3
2.2
JP13_ETCH CSN11
PAD
TP8
C5
1uF
C3
4.7uF
R142
GND
VCC
Q1
NTMFS4821N
0.027uF
C6
2700pF
JP14_ETCH CSP11
Figure 3. Application Circuit
Table 2. ABSOLUTE MAXIMUM RATINGS
Pin Symbol
Pin Name
VMAX
VMIN
VCC
Main Supply Voltage Input
15 V
−0.3 V
BST
Bootstrap Supply Voltage
35 V wrt/ GND
40 V ≤ 50 ns wrt/ GND
15 V wrt/ SW
−0.3 V wrt/SW
SW
Switching Node
(Bootstrap Supply Return)
35 V
40 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 (
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