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NCP5211ADR2

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
NCP5211A
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (continued) (−40°C < T
A
< 85°C; −40°C < T
J
< 125°C; 4.5 V < V
CC
, V
C
< 14 V;
7.0 V < BST < 20 V; C
GATE(H)
= C
GATE(L)
= 3.3 nF; R
OSC
= 51 k; C
COMP
= 0.1 µF, unless otherwise specified.)
Characteristic Test Conditions Min Typ Max Unit
GATE(H) and GATE(L)
High Voltage (AC) GATE(L),
GATE(H)
0.5 nF < C
GATE(H)
= C
GATE(L)
< 10 nF
V
C
− 0.5
BST − 0.5
− − V
Low Voltage (AC) GATE(L) or GATE(H)
0.5 nF < C
GATE(H)
; C
GATE(L)
< 10 nF
− − 0.5 V
Rise Time V
C
= BST = 10 V, Measure:
1.0 V < GATE(L) < 9.0 V,
1.0 V < GATE(H) < 9.0 V
− 40 80 ns
Fall Time V
C
= BST = 10 V, Measure:
1.0 V < GATE(L) < 9.0 V,
1.0 V < GATE(H) < 9.0 V
− 40 80 ns
GATE(H) to GATE(L) Delay GATE(H) < 2.0 V, GATE(L) > 2.0 V 40 70 110 ns
GATE(L) to GATE(H) Delay GATE(L) < 2.0 V, GATE(H) > 2.0 V 40 70 110 ns
GATE(H)/(L) Pull−Down Resistance to PGND 20 50 115 kΩ
Overcurrent Protection
Current Limit Threshold 0 V < IS+ < 4.5 V, 0 V < IS− < 4.5 V 54 60 66 mV
IS+ Bias Current 0 V < IS+ < 4.5 V −1.0 0.1 1.0 µA
IS− Bias Current 0 V < IS− < 4.5 V −1.0 0.1 1.0 µA
PWM Comparator
Transient Response
COMP = 0 − 1.5 V, V
FFB
, 20 mV overdrive − 100 200 ns
PWM Comparator Offset V
FB
= V
FFB
= 0 V; Increase COMP until
GATE(H) starts switching
0.425 0.475 0.525 V
Artificial Ramp Duty Cycle = 70% (Note 3) 30 55 80 mV
V
FFB
Bias Current V
FFB
= 0 V − 0.1 1.0 µA
V
FFB
Max Input (Note 3) 1.1 − − V
Minimum Pulse Width − − − 200 ns
Oscillator
Switching Frequency R
OSC
= 51 k 270 300 330 kHz
R
OSC
Voltage − 1.21 1.25 1.29 V
Max Duty Cycle V
COMP
> V
FFB
+ 1.0 V 65 70 75 %
General Electrical Specifications
V
CC
Supply Current COMP = 0 V (no switching) − 7.0 8.3 mA
BST Supply Current COMP = 0 V (no switching) − 2.0 3.0 mA
V
C
Supply Current COMP = 0 V (no switching) − 2.0 3.0 mA
Start Threshold GATE(H) Switching, COMP Charging 4.03 4.18 4.33 V
Stop Threshold GATE(H) Not Switching, COMP Not Charging 3.89 4.04 4.19 V
Hysteresis Start−Stop 100 140 180 mV
Sense Ground Current − − 0.15 1.00 mA
3. Guaranteed by design. Not tested in production.
NCP5211A
http://onsemi.com
5
PACKAGE PIN DESCRIPTION
PIN NO. PIN SYMBOL FUNCTION
1 GATE(H) High Side Switch FET driver pin. Capable of delivering peak currents of 1.0 A.
2 BST Power supply input for the high side driver.
3 LGND Reference ground. All control circuits are referenced to this pin. IC substrate connection.
4 V
FFB
Input for the PWM comparator.
5 V
FB
Error amplifier input.
6 COMP Error Amp output. PWM Comparator reference input. A capacitor to LGND provides error amp
compensation.
7 SGND Internal reference is connected to this ground. Connect directly at the load for ground remote
sensing.
8 R
OSC
A resistor from this pin to SGND sets switching frequency.
9 V
CC
Input Power Supply Pin. It supplies power to control circuitry. A 0.1 µF decoupling cap is
recommended.
10 IS− Negative input for overcurrent comparator.
11 IS+ Positive input for overcurrent comparator.
12 V
C
Power supply input for the low side driver.
13 GATE(L) Low Side Synchronous FET driver pin. Capable of delivering peak currents of 1.0 A.
14 PGND High Current ground for the GATE(H) and GATE(L) pins.
+
UVLO
Comparator
GATE(L)
GATE(H)
−
+
−
+
−
+
−
+
+
−
−
−
+
Σ
−
+
PGND
R
OSC
V
C
BST
R
S
Q
Q
R
S
Q
Q
COMP Comp
0.4 V
PWM Comparator
Ramp
OSC
0.5 V
Error Amp
0.8 V
V
START
OC
Comparator
60 mV
LGND
V
CC
IS−
IS+
SGND
V
FB
COMP
V
FFB
Figure 2. NCP5211A Block Diagram
PWM FF
Reset Dominant
OC FF
Reset Dominant
R
OSC
START
START
STOP
NCP5211A
http://onsemi.com
6
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. COMP Source and Sink Current
vs. Temperature
Figure 4. Reference Voltage vs. Temperature
TEMPERATURE (°C) TEMPERATURE (°C)
15010050−50 0
26.5
27.5
28.5
29.5
31.5
15010050−50 0
795
805
Figure 5. Current Limit Threshold vs.
Temperature
Figure 6. Switching Frequency vs. R
OSC
TEMPERATURE (°C) R
OSC
(k)
15010050−50 0
58
59
60
62
1201008060402010
100
200
300
400
500
800
1000
Figure 7. Switching Frequency vs. Temperature
R
OSC
= 51 k
Figure 8. V
CC
Supply Current vs. Temperature
(Not Switching)
TEMPERATURE (°C) TEMPERATURE (°C)
15010050−50 0
284
286
288
292
294
296
306
150100500−50
4.0
4.5
5.0
8.0
CURRENT (A)
30.5
V
REF,
REFERENCE VOLTAGE (mV)
CURRENT LIMIT THRESHOLD (mV)
FREQUENCY (kHz)
SWITCHING FREQUENCY (kHz)
V
CC
SUPPLY CURRENT (mA)
800
61
600
700
290
27
28
29
30
31
900
11090705030
300
302
304
298
5.5
6.0
7.0
6.5
7.5
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

NCP5211ADR2

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Manufacturer:
ON Semiconductor
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IC REG CTRLR BUCK 14SOIC
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