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NCP3102CMNTXG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
Semiconductor Components Industries, LLC, 2011
February, 2011 -- Rev. 0
1 Publication Order Number:
NCP3102C/D
NCP3102C
Wide Input Voltage
Synchronous Buck Converter
The NCP3102C is a high efficiency, 10 A DC--DC buck converter
designed to operate from a 5 V to 12 V supply. The device is capable
of producing an output voltage as low as 0.8 V. The NCP3102C can
continuously output 10 A through MOSFET switches driven by an
internally set 275 kHz oscillator. The 40--pin device provides an
optimal level of integration to reduce size and cost of the power
supply. The NCP3102C also incorporates an externally compensated
transconductance error amplifier and a capacitor programmable
soft--start function. Protection features include programmable short
circuit protection and input under voltage lockout (UVLO). The
NCP3102C is available in a 40--pin QFN package.
Features
Split Power Rail 2.7 V to 18 V on PWRVCC
275 kHz Internal Oscillator
Greater Than 90% Max Efficiency
Boost Pin Operates to 35 V
Voltage Mode PWM Control
0.8 V ±1% Internal Reference Voltage
Adjustable Output Voltage
Capacitor Programmable Soft--Start
85% Max Duty Cycle
Input Undervoltage Lockout
Resistor Programmable Current Limit
These are Pb--Free Devices
Applications
Servers / Networking
DSP and FPGA Power Supply
DC--DC Regulator Modules
Figure 1. Typical Application Diagram
Figure 2. Efficiency
EFFICIENCY (%)
I
OUT
(A)
PWRVCC
PWRVCC
EP
VCC
BG
COMP/DIS
AGND
(EP) AGND
CPHS BST
PWRPHS
PWRPHS
(EP)
PWRGND
PWRGND
(EP)
FB
CBST
CO
FC
CC
CP
RSET
R1
R2
LO
D1
CIN
CVCC
100
95
90
85
80
75
70
65
60
55
50
01 2 3 4 5 6 7 8 910
V
IN
=5.0V
V
IN
=12V
MARKING
DIAGRAM
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
ORDERING INFORMATION
QFN40, 6x6
CASE 485AK
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb--Free Package
NCP3102C
AWLYYWWG
401
NCP3102C
http://onsemi.com
2
Figure 3. Detailed Block Diagram
--
+
--
+
--
+
--
+
--
+
--
+
13 24 21 25 26--34
VCC BST TGOUT TGIN PWRVCC
16
17
FB
COMP
DIS
1--4
36--40
22
PWRPHS
CPHS
14,15,19,20,23 35 5--12
AGND BG PWRGND
R
S
Q
PWM
OUT
LATCH
OSC
OSC
RAMP
CLOCK
POR
UVLO
0.8 V
50 mV --550 mV
VOCTH
FAULT
VCC
FAULTFAULT
2V
VOCTH
SET
2V
10 mA
V
ref
CPHS
FAULT
400 mV
NCP3102C
http://onsemi.com
3
Figure 4. Pin Connections
PWRPHS 1
PWRPHS 2
PWRPHS 3
PWRPHS 4
PWRGND 5
PWRGND 6
PWRGND 7
PWRGND 8
PWRGND 9
PWRGND 10
PWRGND 11
PWRGND 12
VCC 13
AGND 14
AGND 15
FB 16
COMP 17
NC 18
AGND 19
AGND 20
30 PWRVCC
29 PWRVCC
28 PWRVCC
27 PWRVCC
26 PWRVCC
25 TGIN
24 BST
23 AGND
22 CPHS
21 TGOUT
40 PWRPHS
39 PWRPHS
38 PWRPHS
37 PWRPHS
36 PWRPHS
35 BG
34 PWRVCC
33 PWRVCC
32 PWRVCC
31 PWRVCC
PWRPHS
PWRVCC
AGND
PWRGND
Table 1. PIN FUNCTION DESCRIPTION
Pin No Symbol Description
1--4, 36--40 PWRPHS Power phase node (PWRPHS). Drain of the low side power MOSFET.
5--12 PWRGND Power ground. High current return for the low-- side power MOSFET. Connect
PWRGND with large copper areas to the input and output supply returns, and
negative terminals of the input and output capacitors.
13 VCC Supply rail for the internal circuitry. Operating supply range is 4.5 V to 13.2 V.
Decouple with a 1 mF capacitor to GND. Ensure that this decoupling capacitor is
placed near the IC.
14,15,19,20,23 AGND IC ground reference. All control circuits are referenced to these pins.
16 FB The inverting input pin t o the error amplifier. Use this pin in conjunction with the
COMP pin to compensate the voltage--control feedback loop. Connect this pin to the
output resistor divider (if used) or directly to output voltage.
17 COMP/DIS Compensation or disable pin. The output of the error amplifier (EA) and the
non--inverting input of the PWM comparator. Use this pin in conjunction with the FB
pin to compensate the voltage--control feedback loop. The compensation capacitor
also acts as a soft start capacitor. Pull the pin below 400 mV to disable controller.
18 NC Not Connected. The pin can be connected to AGND or not connected.
21 TGOUT High side MOSFET driver output.
22 CPHS The controller phase sensing for short circuit protection.
24 BST Supply rail for the floating top gate driver. To form a boost circuit, use an external
diode to bring the desired input voltage to this pin (cathode connected to BST pin).
Connect a capacitor (C
BST
) between this pin and the CPHS pin.
25 TGIN High side MOSFET gate.
26--34 PWRVCC Input supply pin for the high side MOSFET. Connect VCCPWR to the VCC pin or
power separately for split rail application..
35 BG The current limit set pin and low side MOSFET gate drive.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

NCP3102CMNTXG

Mfr. #:
Buy NCP3102CMNTXG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators INTEGRATED SWITCHER
Lifecycle:
New from this manufacturer.
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