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CS5211GD14

Low Voltage Synchronous Buck Controller

ON Semiconductor 

CS5211

ELECTRICAL CHARACTERISTICS (−40°C < TA < 85°C; −40°C < TJ < 125°C; 4.5 V < VCC, VC < 14 V; 7.0 V < BST < 20 V;

CGATE(H) = CGATE(L) = 3.3 nF; ROSC = 51 k; CCOMP = 0.1 mF, unless otherwise specified.) (Note 3)

Characteristic

Test Conditions

Min

Typ Max Unit

General Electrical Specifications

VCC Supply Current

BST/VC Supply Current

Start Threshold

COMP = 0 V (no switching)

COMP = 0 V (no switching)

GATE(H) Switching, COMP Charging

−

5.0

8.0 mA

−

2.0

3.0 mA

3.90

4.05 4.20

V

Stop Threshold

GATE(H) Not Switching, COMP Not Charging

3.75

3.90 4.05

V

Hysteresis

Start−Stop

100

150

200

mV

Sense Ground Current

(Note 4)

−

0.15 1.00 mA

3. Guaranteed by design. Not tested in production.

4. Recommended maximum operating voltage between the three grounds is 200 mV.

VFFB

0.5 V

Σ

PWM Comparator

Reset Dominant

R

Q

COMP

VFB

SGND

VCC

IS+

IS−

LGND

− Error Amp

+

1.0 V

ART Ramp

OSC

ROSC

Fault

S

Q

PWM FF

0.8 V

VSTART

100 % DC

− Comparator

+

UVLO

Comparator

UVLO

Set Dominant

Fault

S

Q

60 mV

OC

Comparator

−

0.25 V +

RQ

5.0 mA

COMP Discharge COMP

Figure 2. Block Diagram

BST

GATE(H)

VC

GATE(L)

PGND

ROSC

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