ON Semiconductor NCV891234, NCV891334 User Manual
NCV891234, NCV891334
NCV891234, NCV891334
Evaluation Board
User'sManual
Description
The NCV891x34 is a Dual Mode regulator intended for
Automotive, battery−connected applications. The output is
fixed to either 3.3 V or 5.0 V, capable of delivering 2.0 A
(NCV891234) or 3.0 A (NCV891334). At low output
currents (≤ 50 mA), the device will operate in LDO mode,
switching to PWM mode as current increases beyond
50 mA. The device is equipped with SYNCI and SYNCO
pins to synchronize to an external clock and/or another
NCV891x34. A reset (with fixed delay) and a fault pin
(flagging low input voltage and high temperature warnings)
simplify interfacing with a microcontroller.
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EVAL BOARD USER’S MANUAL
This document will help the user to set up the hardware
and to make demonstration kit running. All evaluation kit
components will be described (evaluation board,
connections, jumper’s configuration). A quick test
procedure will be also described to guide the user.
Top Side Bottom Side
Features and Benefits
• 40 mA Iq in Light Load Condition
• 2.0 A Maximum Output Current in PWM Mode in
NCV891234
• 3.0 A Maximum Output Current in PWM Mode in
NCV891334
• Internal N−channel Power Switch
• V
Operating Range 3.7 V to 36 V, Withstands Load
IN
Dump to 45 V
• Logic Level Enable Pin can be Tied to Battery
© Semiconductor Components Industries, LLC, 2016
November, 2016 − Rev. 0
Figure 1. Evaluation Board Photo
• Fixed Output Voltage of 5.0 V or 3.3 V with ±2%
Accuracy
• 2 MHz Free−running Switching Frequency
• Input and Output Synchronization Pins
Typical Applications
• Safety – Vision Systems
• Audio, Infotainment
• Instrumentation
• Telematics
1 Publication Order Number:
EVBUM2492/D
NCV891234, NCV891334
BLOCK DIAGRAM
CDRV
VIN VOUT
CIN
SYNCO
RESET
VIN
VIN2
DRV
SYNCO
RSTB
3.3 V
Reg
VOLTAGES
MONITORS
MODE
SELECTION
Oscillator
Enable
Sync
Sync
Out
comp
TSD
In
+
+
S
2A, 3A
detector
Soft−Start
RESET
Switcher Supply
ON
Low
PWM
LOGIC
ON
+
−
−
+
LINEAR
REGULATOR
ON
OFF
+
OVLD
−
+
GND
Logic
Fault
NCV891234, NCV891334
Detection
SW
BST
VOUT
EN
SYNCI
+
FLTB
CBST
DBST
DFW
EN
SYNCI
FAULT
L1
COUT
Figure 2. NCV891x34 Simplified Block Diagram
TYPICAL APPLICATION
CDRV
DBST
VIN VOUT
CIN
SYNCO
RESET
Figure 3. NCV891x34 Typical Application Diagram
VIN
VIN 2
DRV
SYNCO
GND
NCV891x34
VOUT
SYNCIRSTB
FLTB
SW
BST
L1
CBST
EN
DFW
ENABLE
SYNCI
FAULT
COUT
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NCV891234, NCV891334
Table 1. EVALUATION BOARD TERMINALS
Pin Number Pin Name Function
1 VBAT Input voltage from battery. Place an input filter capacitor in close proximity to this pin.
4 SYNCO Out−of−phase synchronization output. Turn−on of the Power Switch causes the SYNCO signal to
5 RSTB Reset function. Open drain output, pulling down to ground when output voltage is out of regulation.
6 GND Battery return and output voltage ground reference.
7 FLTB Fault flag indicating various fault conditions for the part.
8 SYNCI Synchronization input. Connecting an external clock to this pin synchronizes switching to the rising
9 EN This TTL compatible Enable input allows the direct connection of Battery as the enable signal.
10 VOUT Output voltage feedback and LDO output. Feedback of output voltage used for regulation, as well
Table 2. ABSOLUTE MAXIMUM RATINGS
(Voltages are with respect to GND)
DC supply voltage (VBAT) −0.3 to 45 V
DC supply voltage (EN) −0.3 to 40 V
DC supply voltage (VOUT) −0.3 to 18 V
DC supply voltage (SYNCI, RSTB, and FLTB) −0.3 to 6 V
DC supply voltage (SYNCO) −0.3 to 3.6 V
Storage Temperature Range −55 to +150 °C
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.
fall (and rise half a switching period later).
edge of the SYNCI signal.
Grounding this signal stops switching and reduces quiescent current draw to a minimum.
as LDO output in LDO mode.
Rating
Value Units
Table 3. ELECTRICAL CHARACTERISTICS
Characteristics Conditions Typical Value Units
Regulation
Output Voltage (NCV891x34MW33GEVB)
Output Voltage (NCV891x34MW50GEVB) 5.0 V
Switching
Switching Frequency
Soft−start Time 1.4 ms
Synchronization Frequency Range 1.8 to 2.5 MHz
Current Limit
Peak Current Limit (NCV891234MWxxGEVB)
Peak Current Limit (NCV891334MWxxGEVB) 4.4 A
Protections
V
Input Undervoltage Lockout (UVLO)
Input Overvoltage Protection V
Thermal Shutdown TJ rising 170 °C
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.
decreasing 3.1 V
BAT
increasing 37.7 V
BAT
3.3 V
2.0 MHz
3.25 A
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