MAX16903 Datasheet, PDF (6/13 Pages) Maxim Integrated Products – 2.1MHz, High-Voltage, 1A Mini-Buck Converter Thermal Shutdown Protection

2.1MHz, High-Voltage, 1A Mini-Buck Converter
Typical Operating Characteristics (continued)
(V_SUP = +14V, T_A = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(SKIP MODE)
MAX16903 toc09
UNDERVOLTAGE PULSE (COLD CRANK)
MAX16903 toc10
500
14V
I_LOAD
1A/div _3.5V
450
V_SUP
10V/div
400
350
STANDBY CURRENT
vs. LOAD CURRENT
V_OUT
5V
200mV/div
AC-
COUPLED
5V
PGOOD
5V/div
I_LOAD = 100mA TO 1A TO 100mA
200µs/div
V_OUT
300
5V/div
250
200
PGOOD
5V/div
150
I_LOAD = 500mA
100
I_LOAD
50
1A/div
0
10ms/div
0.01
0.10
1.00
I_LOAD (mA)
Pin Configurations
TOP VIEW
BST 1
SUP 2
LX 3
PGND 4
OUTS 5
+
MAX16903
EP
10 EN
9 GND
8 BIAS
7 SYNC
6 PGOOD
TDFN
BST 1 ⁺
16 N.C.
SUP 2
15 EN
SUP 3
14 GND
LX 4
MAX16903 13 BIAS
LX 5
12 SYNC
PGND 6
11 PGOOD
PGND 7
OUTS 8
10 N.C.
EP _{9 N.C.}
TSSOP
PIN
TDFN TSSOP
1
1
2
2, 3
3
4, 5
4
6, 7
Pin Description
NAME
BST
SUP
LX
PGND
FUNCTION
Bootstrap Capacitor for High-Side Driver (0.1μF)
Voltage Supply Input. Connect a 4.7μF ceramic capacitor from SUP to PGND. Place the
capacitor very close to the SUP pin. For the TSSOP-EP package, connect both SUP pins
together for proper operation.
Buck Switching Node. LX is high impedance when the device is off. For the TSSOP
package, connect both LX pins together for proper operation.
Power Ground. For the TSSOP-EP package, connect both PGND pins together for proper
operation.
6 _______________________________________________________________________________________